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| author | garhve <git@garhve.com> | 2022-12-20 11:07:35 +0800 |
|---|---|---|
| committer | garhve <git@garhve.com> | 2022-12-20 11:07:35 +0800 |
| commit | b5aa889f7fced8ba2cc1698ae9696d7bd0ca8ab5 (patch) | |
| tree | 6fb532d8da57cf502b2a06844a743bf12789306a /rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions | |
| parent | 369d11587339ce74f8ebc76f2607fe55545eaf7d (diff) | |
remove compiled binary
Diffstat (limited to 'rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions')
11 files changed, 0 insertions, 8771 deletions
diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/bernoulli.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/bernoulli.rs.html deleted file mode 100644 index 8b882e8..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/bernoulli.rs.html +++ /dev/null @@ -1,441 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/bernoulli.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>bernoulli.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" 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src="../../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> -<span id="2">2</span> -<span id="3">3</span> -<span id="4">4</span> -<span id="5">5</span> -<span id="6">6</span> -<span id="7">7</span> -<span id="8">8</span> -<span id="9">9</span> -<span id="10">10</span> -<span id="11">11</span> -<span id="12">12</span> -<span id="13">13</span> -<span id="14">14</span> -<span id="15">15</span> -<span id="16">16</span> -<span id="17">17</span> -<span id="18">18</span> -<span id="19">19</span> -<span id="20">20</span> -<span id="21">21</span> -<span id="22">22</span> -<span id="23">23</span> -<span id="24">24</span> -<span id="25">25</span> -<span id="26">26</span> -<span id="27">27</span> -<span id="28">28</span> -<span id="29">29</span> -<span id="30">30</span> -<span id="31">31</span> -<span id="32">32</span> -<span id="33">33</span> -<span id="34">34</span> -<span 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License, Version 2.0 <LICENSE-APACHE or -// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! The Bernoulli distribution. - -</span><span class="kw">use </span><span class="kw">crate</span>::distributions::Distribution; -<span class="kw">use </span><span class="kw">crate</span>::Rng; -<span class="kw">use </span>core::{fmt, u64}; - -<span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] -</span><span class="kw">use </span>serde::{Serialize, Deserialize}; -<span class="doccomment">/// The Bernoulli distribution. -/// -/// This is a special case of the Binomial distribution where `n = 1`. -/// -/// # Example -/// -/// ```rust -/// use rand::distributions::{Bernoulli, Distribution}; -/// -/// let d = Bernoulli::new(0.3).unwrap(); -/// let v = d.sample(&mut rand::thread_rng()); -/// println!("{} is from a Bernoulli distribution", v); -/// ``` -/// -/// # Precision -/// -/// This `Bernoulli` distribution uses 64 bits from the RNG (a `u64`), -/// so only probabilities that are multiples of 2<sup>-64</sup> can be -/// represented. -</span><span class="attribute">#[derive(Clone, Copy, Debug, PartialEq)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -</span><span class="kw">pub struct </span>Bernoulli { - <span class="doccomment">/// Probability of success, relative to the maximal integer. - </span>p_int: u64, -} - -<span class="comment">// To sample from the Bernoulli distribution we use a method that compares a -// random `u64` value `v < (p * 2^64)`. -// -// If `p == 1.0`, the integer `v` to compare against can not represented as a -// `u64`. We manually set it to `u64::MAX` instead (2^64 - 1 instead of 2^64). -// Note that value of `p < 1.0` can never result in `u64::MAX`, because an -// `f64` only has 53 bits of precision, and the next largest value of `p` will -// result in `2^64 - 2048`. -// -// Also there is a 100% theoretical concern: if someone consistently wants to -// generate `true` using the Bernoulli distribution (i.e. by using a probability -// of `1.0`), just using `u64::MAX` is not enough. On average it would return -// false once every 2^64 iterations. Some people apparently care about this -// case. -// -// That is why we special-case `u64::MAX` to always return `true`, without using -// the RNG, and pay the performance price for all uses that *are* reasonable. -// Luckily, if `new()` and `sample` are close, the compiler can optimize out the -// extra check. -</span><span class="kw">const </span>ALWAYS_TRUE: u64 = u64::MAX; - -<span class="comment">// This is just `2.0.powi(64)`, but written this way because it is not available -// in `no_std` mode. -</span><span class="kw">const </span>SCALE: f64 = <span class="number">2.0 </span>* (<span class="number">1u64 </span><< <span class="number">63</span>) <span class="kw">as </span>f64; - -<span class="doccomment">/// Error type returned from `Bernoulli::new`. -</span><span class="attribute">#[derive(Clone, Copy, Debug, PartialEq, Eq)] -</span><span class="kw">pub enum </span>BernoulliError { - <span class="doccomment">/// `p < 0` or `p > 1`. - </span>InvalidProbability, -} - -<span class="kw">impl </span>fmt::Display <span class="kw">for </span>BernoulliError { - <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { - f.write_str(<span class="kw">match </span><span class="self">self </span>{ - BernoulliError::InvalidProbability => <span class="string">"p is outside [0, 1] in Bernoulli distribution"</span>, - }) - } -} - -<span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] -</span><span class="kw">impl </span>::std::error::Error <span class="kw">for </span>BernoulliError {} - -<span class="kw">impl </span>Bernoulli { - <span class="doccomment">/// Construct a new `Bernoulli` with the given probability of success `p`. - /// - /// # Precision - /// - /// For `p = 1.0`, the resulting distribution will always generate true. - /// For `p = 0.0`, the resulting distribution will always generate false. - /// - /// This method is accurate for any input `p` in the range `[0, 1]` which is - /// a multiple of 2<sup>-64</sup>. (Note that not all multiples of - /// 2<sup>-64</sup> in `[0, 1]` can be represented as a `f64`.) - </span><span class="attribute">#[inline] - </span><span class="kw">pub fn </span>new(p: f64) -> <span class="prelude-ty">Result</span><Bernoulli, BernoulliError> { - <span class="kw">if </span>!(<span class="number">0.0</span>..<span class="number">1.0</span>).contains(<span class="kw-2">&</span>p) { - <span class="kw">if </span>p == <span class="number">1.0 </span>{ - <span class="kw">return </span><span class="prelude-val">Ok</span>(Bernoulli { p_int: ALWAYS_TRUE }); - } - <span class="kw">return </span><span class="prelude-val">Err</span>(BernoulliError::InvalidProbability); - } - <span class="prelude-val">Ok</span>(Bernoulli { - p_int: (p * SCALE) <span class="kw">as </span>u64, - }) - } - - <span class="doccomment">/// Construct a new `Bernoulli` with the probability of success of - /// `numerator`-in-`denominator`. I.e. `new_ratio(2, 3)` will return - /// a `Bernoulli` with a 2-in-3 chance, or about 67%, of returning `true`. - /// - /// return `true`. If `numerator == 0` it will always return `false`. - /// For `numerator > denominator` and `denominator == 0`, this returns an - /// error. Otherwise, for `numerator == denominator`, samples are always - /// true; for `numerator == 0` samples are always false. - </span><span class="attribute">#[inline] - </span><span class="kw">pub fn </span>from_ratio(numerator: u32, denominator: u32) -> <span class="prelude-ty">Result</span><Bernoulli, BernoulliError> { - <span class="kw">if </span>numerator > denominator || denominator == <span class="number">0 </span>{ - <span class="kw">return </span><span class="prelude-val">Err</span>(BernoulliError::InvalidProbability); - } - <span class="kw">if </span>numerator == denominator { - <span class="kw">return </span><span class="prelude-val">Ok</span>(Bernoulli { p_int: ALWAYS_TRUE }); - } - <span class="kw">let </span>p_int = ((f64::from(numerator) / f64::from(denominator)) * SCALE) <span class="kw">as </span>u64; - <span class="prelude-val">Ok</span>(Bernoulli { p_int }) - } -} - -<span class="kw">impl </span>Distribution<bool> <span class="kw">for </span>Bernoulli { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> bool { - <span class="comment">// Make sure to always return true for p = 1.0. - </span><span class="kw">if </span><span class="self">self</span>.p_int == ALWAYS_TRUE { - <span class="kw">return </span><span class="bool-val">true</span>; - } - <span class="kw">let </span>v: u64 = rng.gen(); - v < <span class="self">self</span>.p_int - } -} - -<span class="attribute">#[cfg(test)] -</span><span class="kw">mod </span>test { - <span class="kw">use </span><span class="kw">super</span>::Bernoulli; - <span class="kw">use </span><span class="kw">crate</span>::distributions::Distribution; - <span class="kw">use </span><span class="kw">crate</span>::Rng; - - <span class="attribute">#[test] - #[cfg(feature=<span class="string">"serde1"</span>)] - </span><span class="kw">fn </span>test_serializing_deserializing_bernoulli() { - <span class="kw">let </span>coin_flip = Bernoulli::new(<span class="number">0.5</span>).unwrap(); - <span class="kw">let </span>de_coin_flip : Bernoulli = bincode::deserialize(<span class="kw-2">&</span>bincode::serialize(<span class="kw-2">&</span>coin_flip).unwrap()).unwrap(); - - <span class="macro">assert_eq!</span>(coin_flip.p_int, de_coin_flip.p_int); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_trivial() { - <span class="comment">// We prefer to be explicit here. - </span><span class="attribute">#![allow(clippy::bool_assert_comparison)] - - </span><span class="kw">let </span><span class="kw-2">mut </span>r = <span class="kw">crate</span>::test::rng(<span class="number">1</span>); - <span class="kw">let </span>always_false = Bernoulli::new(<span class="number">0.0</span>).unwrap(); - <span class="kw">let </span>always_true = Bernoulli::new(<span class="number">1.0</span>).unwrap(); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">5 </span>{ - <span class="macro">assert_eq!</span>(r.sample::<bool, <span class="kw">_</span>>(<span class="kw-2">&</span>always_false), <span class="bool-val">false</span>); - <span class="macro">assert_eq!</span>(r.sample::<bool, <span class="kw">_</span>>(<span class="kw-2">&</span>always_true), <span class="bool-val">true</span>); - <span class="macro">assert_eq!</span>(Distribution::<bool>::sample(<span class="kw-2">&</span>always_false, <span class="kw-2">&mut </span>r), <span class="bool-val">false</span>); - <span class="macro">assert_eq!</span>(Distribution::<bool>::sample(<span class="kw-2">&</span>always_true, <span class="kw-2">&mut </span>r), <span class="bool-val">true</span>); - } - } - - <span class="attribute">#[test] - #[cfg_attr(miri, ignore)] </span><span class="comment">// Miri is too slow - </span><span class="kw">fn </span>test_average() { - <span class="kw">const </span>P: f64 = <span class="number">0.3</span>; - <span class="kw">const </span>NUM: u32 = <span class="number">3</span>; - <span class="kw">const </span>DENOM: u32 = <span class="number">10</span>; - <span class="kw">let </span>d1 = Bernoulli::new(P).unwrap(); - <span class="kw">let </span>d2 = Bernoulli::from_ratio(NUM, DENOM).unwrap(); - <span class="kw">const </span>N: u32 = <span class="number">100_000</span>; - - <span class="kw">let </span><span class="kw-2">mut </span>sum1: u32 = <span class="number">0</span>; - <span class="kw">let </span><span class="kw-2">mut </span>sum2: u32 = <span class="number">0</span>; - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">2</span>); - <span class="kw">for _ in </span><span class="number">0</span>..N { - <span class="kw">if </span>d1.sample(<span class="kw-2">&mut </span>rng) { - sum1 += <span class="number">1</span>; - } - <span class="kw">if </span>d2.sample(<span class="kw-2">&mut </span>rng) { - sum2 += <span class="number">1</span>; - } - } - <span class="kw">let </span>avg1 = (sum1 <span class="kw">as </span>f64) / (N <span class="kw">as </span>f64); - <span class="macro">assert!</span>((avg1 - P).abs() < <span class="number">5e-3</span>); - - <span class="kw">let </span>avg2 = (sum2 <span class="kw">as </span>f64) / (N <span class="kw">as </span>f64); - <span class="macro">assert!</span>((avg2 - (NUM <span class="kw">as </span>f64) / (DENOM <span class="kw">as </span>f64)).abs() < <span class="number">5e-3</span>); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>value_stability() { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">3</span>); - <span class="kw">let </span>distr = Bernoulli::new(<span class="number">0.4532</span>).unwrap(); - <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="bool-val">false</span>; <span class="number">10</span>]; - <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&mut </span>buf { - <span class="kw-2">*</span>x = rng.sample(<span class="kw-2">&</span>distr); - } - <span class="macro">assert_eq!</span>(buf, [ - <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true - </span>]); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>bernoulli_distributions_can_be_compared() { - <span class="macro">assert_eq!</span>(Bernoulli::new(<span class="number">1.0</span>), Bernoulli::new(<span class="number">1.0</span>)); - } -} -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/distribution.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/distribution.rs.html deleted file mode 100644 index afc8925..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/distribution.rs.html +++ /dev/null @@ -1,547 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/distribution.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>distribution.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin 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href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> -<span id="2">2</span> -<span id="3">3</span> -<span id="4">4</span> -<span id="5">5</span> -<span id="6">6</span> -<span id="7">7</span> -<span id="8">8</span> -<span id="9">9</span> -<span id="10">10</span> -<span id="11">11</span> -<span id="12">12</span> -<span id="13">13</span> -<span id="14">14</span> -<span id="15">15</span> -<span id="16">16</span> -<span id="17">17</span> -<span id="18">18</span> -<span id="19">19</span> -<span id="20">20</span> -<span id="21">21</span> -<span id="22">22</span> -<span id="23">23</span> -<span id="24">24</span> -<span id="25">25</span> -<span id="26">26</span> -<span id="27">27</span> -<span id="28">28</span> -<span id="29">29</span> -<span id="30">30</span> -<span id="31">31</span> 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This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! Distribution trait and associates - -</span><span class="kw">use </span><span class="kw">crate</span>::Rng; -<span class="kw">use </span>core::iter; -<span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] -</span><span class="kw">use </span>alloc::string::String; - -<span class="doccomment">/// Types (distributions) that can be used to create a random instance of `T`. -/// -/// It is possible to sample from a distribution through both the -/// `Distribution` and [`Rng`] traits, via `distr.sample(&mut rng)` and -/// `rng.sample(distr)`. They also both offer the [`sample_iter`] method, which -/// produces an iterator that samples from the distribution. -/// -/// All implementations are expected to be immutable; this has the significant -/// advantage of not needing to consider thread safety, and for most -/// distributions efficient state-less sampling algorithms are available. -/// -/// Implementations are typically expected to be portable with reproducible -/// results when used with a PRNG with fixed seed; see the -/// [portability chapter](https://rust-random.github.io/book/portability.html) -/// of The Rust Rand Book. In some cases this does not apply, e.g. the `usize` -/// type requires different sampling on 32-bit and 64-bit machines. -/// -/// [`sample_iter`]: Distribution::sample_iter -</span><span class="kw">pub trait </span>Distribution<T> { - <span class="doccomment">/// Generate a random value of `T`, using `rng` as the source of randomness. - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> T; - - <span class="doccomment">/// Create an iterator that generates random values of `T`, using `rng` as - /// the source of randomness. - /// - /// Note that this function takes `self` by value. This works since - /// `Distribution<T>` is impl'd for `&D` where `D: Distribution<T>`, - /// however borrowing is not automatic hence `distr.sample_iter(...)` may - /// need to be replaced with `(&distr).sample_iter(...)` to borrow or - /// `(&*distr).sample_iter(...)` to reborrow an existing reference. - /// - /// # Example - /// - /// ``` - /// use rand::thread_rng; - /// use rand::distributions::{Distribution, Alphanumeric, Uniform, Standard}; - /// - /// let mut rng = thread_rng(); - /// - /// // Vec of 16 x f32: - /// let v: Vec<f32> = Standard.sample_iter(&mut rng).take(16).collect(); - /// - /// // String: - /// let s: String = Alphanumeric - /// .sample_iter(&mut rng) - /// .take(7) - /// .map(char::from) - /// .collect(); - /// - /// // Dice-rolling: - /// let die_range = Uniform::new_inclusive(1, 6); - /// let mut roll_die = die_range.sample_iter(&mut rng); - /// while roll_die.next().unwrap() != 6 { - /// println!("Not a 6; rolling again!"); - /// } - /// ``` - </span><span class="kw">fn </span>sample_iter<R>(<span class="self">self</span>, rng: R) -> DistIter<<span class="self">Self</span>, R, T> - <span class="kw">where - </span>R: Rng, - <span class="self">Self</span>: Sized, - { - DistIter { - distr: <span class="self">self</span>, - rng, - phantom: ::core::marker::PhantomData, - } - } - - <span class="doccomment">/// Create a distribution of values of 'S' by mapping the output of `Self` - /// through the closure `F` - /// - /// # Example - /// - /// ``` - /// use rand::thread_rng; - /// use rand::distributions::{Distribution, Uniform}; - /// - /// let mut rng = thread_rng(); - /// - /// let die = Uniform::new_inclusive(1, 6); - /// let even_number = die.map(|num| num % 2 == 0); - /// while !even_number.sample(&mut rng) { - /// println!("Still odd; rolling again!"); - /// } - /// ``` - </span><span class="kw">fn </span>map<F, S>(<span class="self">self</span>, func: F) -> DistMap<<span class="self">Self</span>, F, T, S> - <span class="kw">where - </span>F: Fn(T) -> S, - <span class="self">Self</span>: Sized, - { - DistMap { - distr: <span class="self">self</span>, - func, - phantom: ::core::marker::PhantomData, - } - } -} - -<span class="kw">impl</span><<span class="lifetime">'a</span>, T, D: Distribution<T>> Distribution<T> <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>D { - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> T { - (<span class="kw-2">*</span><span class="self">self</span>).sample(rng) - } -} - -<span class="doccomment">/// An iterator that generates random values of `T` with distribution `D`, -/// using `R` as the source of randomness. -/// -/// This `struct` is created by the [`sample_iter`] method on [`Distribution`]. -/// See its documentation for more. -/// -/// [`sample_iter`]: Distribution::sample_iter -</span><span class="attribute">#[derive(Debug)] -</span><span class="kw">pub struct </span>DistIter<D, R, T> { - distr: D, - rng: R, - phantom: ::core::marker::PhantomData<T>, -} - -<span class="kw">impl</span><D, R, T> Iterator <span class="kw">for </span>DistIter<D, R, T> -<span class="kw">where - </span>D: Distribution<T>, - R: Rng, -{ - <span class="kw">type </span>Item = T; - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><T> { - <span class="comment">// Here, self.rng may be a reference, but we must take &mut anyway. - // Even if sample could take an R: Rng by value, we would need to do this - // since Rng is not copyable and we cannot enforce that this is "reborrowable". - </span><span class="prelude-val">Some</span>(<span class="self">self</span>.distr.sample(<span class="kw-2">&mut </span><span class="self">self</span>.rng)) - } - - <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { - (usize::max_value(), <span class="prelude-val">None</span>) - } -} - -<span class="kw">impl</span><D, R, T> iter::FusedIterator <span class="kw">for </span>DistIter<D, R, T> -<span class="kw">where - </span>D: Distribution<T>, - R: Rng, -{ -} - -<span class="attribute">#[cfg(features = <span class="string">"nightly"</span>)] -</span><span class="kw">impl</span><D, R, T> iter::TrustedLen <span class="kw">for </span>DistIter<D, R, T> -<span class="kw">where - </span>D: Distribution<T>, - R: Rng, -{ -} - -<span class="doccomment">/// A distribution of values of type `S` derived from the distribution `D` -/// by mapping its output of type `T` through the closure `F`. -/// -/// This `struct` is created by the [`Distribution::map`] method. -/// See its documentation for more. -</span><span class="attribute">#[derive(Debug)] -</span><span class="kw">pub struct </span>DistMap<D, F, T, S> { - distr: D, - func: F, - phantom: ::core::marker::PhantomData<<span class="kw">fn</span>(T) -> S>, -} - -<span class="kw">impl</span><D, F, T, S> Distribution<S> <span class="kw">for </span>DistMap<D, F, T, S> -<span class="kw">where - </span>D: Distribution<T>, - F: Fn(T) -> S, -{ - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> S { - (<span class="self">self</span>.func)(<span class="self">self</span>.distr.sample(rng)) - } -} - -<span class="doccomment">/// `String` sampler -/// -/// Sampling a `String` of random characters is not quite the same as collecting -/// a sequence of chars. This trait contains some helpers. -</span><span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] -</span><span class="kw">pub trait </span>DistString { - <span class="doccomment">/// Append `len` random chars to `string` - </span><span class="kw">fn </span>append_string<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R, string: <span class="kw-2">&mut </span>String, len: usize); - - <span class="doccomment">/// Generate a `String` of `len` random chars - </span><span class="attribute">#[inline] - </span><span class="kw">fn </span>sample_string<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R, len: usize) -> String { - <span class="kw">let </span><span class="kw-2">mut </span>s = String::new(); - <span class="self">self</span>.append_string(rng, <span class="kw-2">&mut </span>s, len); - s - } -} - -<span class="attribute">#[cfg(test)] -</span><span class="kw">mod </span>tests { - <span class="kw">use </span><span class="kw">crate</span>::distributions::{Distribution, Uniform}; - <span class="kw">use </span><span class="kw">crate</span>::Rng; - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_distributions_iter() { - <span class="kw">use </span><span class="kw">crate</span>::distributions::Open01; - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">210</span>); - <span class="kw">let </span>distr = Open01; - <span class="kw">let </span><span class="kw-2">mut </span>iter = Distribution::<f32>::sample_iter(distr, <span class="kw-2">&mut </span>rng); - <span class="kw">let </span><span class="kw-2">mut </span>sum: f32 = <span class="number">0.</span>; - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">100 </span>{ - sum += iter.next().unwrap(); - } - <span class="macro">assert!</span>(<span class="number">0. </span>< sum && sum < <span class="number">100.</span>); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_distributions_map() { - <span class="kw">let </span>dist = Uniform::new_inclusive(<span class="number">0</span>, <span class="number">5</span>).map(|val| val + <span class="number">15</span>); - - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">212</span>); - <span class="kw">let </span>val = dist.sample(<span class="kw-2">&mut </span>rng); - <span class="macro">assert!</span>((<span class="number">15</span>..=<span class="number">20</span>).contains(<span class="kw-2">&</span>val)); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_make_an_iter() { - <span class="kw">fn </span>ten_dice_rolls_other_than_five<R: Rng>( - rng: <span class="kw-2">&mut </span>R, - ) -> <span class="kw">impl </span>Iterator<Item = i32> + <span class="lifetime">'_ </span>{ - Uniform::new_inclusive(<span class="number">1</span>, <span class="number">6</span>) - .sample_iter(rng) - .filter(|x| <span class="kw-2">*</span>x != <span class="number">5</span>) - .take(<span class="number">10</span>) - } - - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">211</span>); - <span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">0</span>; - <span class="kw">for </span>val <span class="kw">in </span>ten_dice_rolls_other_than_five(<span class="kw-2">&mut </span>rng) { - <span class="macro">assert!</span>((<span class="number">1</span>..=<span class="number">6</span>).contains(<span class="kw-2">&</span>val) && val != <span class="number">5</span>); - count += <span class="number">1</span>; - } - <span class="macro">assert_eq!</span>(count, <span class="number">10</span>); - } - - <span class="attribute">#[test] - #[cfg(feature = <span class="string">"alloc"</span>)] - </span><span class="kw">fn </span>test_dist_string() { - <span class="kw">use </span>core::str; - <span class="kw">use </span><span class="kw">crate</span>::distributions::{Alphanumeric, DistString, Standard}; - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">213</span>); - - <span class="kw">let </span>s1 = Alphanumeric.sample_string(<span class="kw-2">&mut </span>rng, <span class="number">20</span>); - <span class="macro">assert_eq!</span>(s1.len(), <span class="number">20</span>); - <span class="macro">assert_eq!</span>(str::from_utf8(s1.as_bytes()), <span class="prelude-val">Ok</span>(s1.as_str())); - - <span class="kw">let </span>s2 = Standard.sample_string(<span class="kw-2">&mut </span>rng, <span class="number">20</span>); - <span class="macro">assert_eq!</span>(s2.chars().count(), <span class="number">20</span>); - <span class="macro">assert_eq!</span>(str::from_utf8(s2.as_bytes()), <span class="prelude-val">Ok</span>(s2.as_str())); - } -} -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/float.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/float.rs.html deleted file mode 100644 index cba1f5b..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/float.rs.html +++ /dev/null @@ -1,627 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/float.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>float.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" 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src="../../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> -<span id="2">2</span> -<span id="3">3</span> -<span id="4">4</span> -<span id="5">5</span> -<span id="6">6</span> -<span id="7">7</span> -<span id="8">8</span> -<span id="9">9</span> -<span id="10">10</span> -<span id="11">11</span> -<span id="12">12</span> -<span id="13">13</span> -<span id="14">14</span> -<span id="15">15</span> -<span id="16">16</span> -<span id="17">17</span> -<span id="18">18</span> -<span id="19">19</span> -<span id="20">20</span> -<span id="21">21</span> -<span id="22">22</span> -<span id="23">23</span> -<span id="24">24</span> -<span id="25">25</span> -<span id="26">26</span> -<span id="27">27</span> -<span id="28">28</span> -<span id="29">29</span> -<span id="30">30</span> -<span id="31">31</span> -<span id="32">32</span> -<span id="33">33</span> -<span id="34">34</span> -<span 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This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! Basic floating-point number distributions - -</span><span class="kw">use </span><span class="kw">crate</span>::distributions::utils::FloatSIMDUtils; -<span class="kw">use </span><span class="kw">crate</span>::distributions::{Distribution, Standard}; -<span class="kw">use </span><span class="kw">crate</span>::Rng; -<span class="kw">use </span>core::mem; -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] </span><span class="kw">use </span>packed_simd::<span class="kw-2">*</span>; - -<span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] -</span><span class="kw">use </span>serde::{Serialize, Deserialize}; - -<span class="doccomment">/// A distribution to sample floating point numbers uniformly in the half-open -/// interval `(0, 1]`, i.e. including 1 but not 0. -/// -/// All values that can be generated are of the form `n * ε/2`. For `f32` -/// the 24 most significant random bits of a `u32` are used and for `f64` the -/// 53 most significant bits of a `u64` are used. The conversion uses the -/// multiplicative method. -/// -/// See also: [`Standard`] which samples from `[0, 1)`, [`Open01`] -/// which samples from `(0, 1)` and [`Uniform`] which samples from arbitrary -/// ranges. -/// -/// # Example -/// ``` -/// use rand::{thread_rng, Rng}; -/// use rand::distributions::OpenClosed01; -/// -/// let val: f32 = thread_rng().sample(OpenClosed01); -/// println!("f32 from (0, 1): {}", val); -/// ``` -/// -/// [`Standard`]: crate::distributions::Standard -/// [`Open01`]: crate::distributions::Open01 -/// [`Uniform`]: crate::distributions::uniform::Uniform -</span><span class="attribute">#[derive(Clone, Copy, Debug)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -</span><span class="kw">pub struct </span>OpenClosed01; - -<span class="doccomment">/// A distribution to sample floating point numbers uniformly in the open -/// interval `(0, 1)`, i.e. not including either endpoint. -/// -/// All values that can be generated are of the form `n * ε + ε/2`. For `f32` -/// the 23 most significant random bits of an `u32` are used, for `f64` 52 from -/// an `u64`. The conversion uses a transmute-based method. -/// -/// See also: [`Standard`] which samples from `[0, 1)`, [`OpenClosed01`] -/// which samples from `(0, 1]` and [`Uniform`] which samples from arbitrary -/// ranges. -/// -/// # Example -/// ``` -/// use rand::{thread_rng, Rng}; -/// use rand::distributions::Open01; -/// -/// let val: f32 = thread_rng().sample(Open01); -/// println!("f32 from (0, 1): {}", val); -/// ``` -/// -/// [`Standard`]: crate::distributions::Standard -/// [`OpenClosed01`]: crate::distributions::OpenClosed01 -/// [`Uniform`]: crate::distributions::uniform::Uniform -</span><span class="attribute">#[derive(Clone, Copy, Debug)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -</span><span class="kw">pub struct </span>Open01; - - -<span class="comment">// This trait is needed by both this lib and rand_distr hence is a hidden export -</span><span class="attribute">#[doc(hidden)] -</span><span class="kw">pub trait </span>IntoFloat { - <span class="kw">type </span>F; - - <span class="doccomment">/// Helper method to combine the fraction and a constant exponent into a - /// float. - /// - /// Only the least significant bits of `self` may be set, 23 for `f32` and - /// 52 for `f64`. - /// The resulting value will fall in a range that depends on the exponent. - /// As an example the range with exponent 0 will be - /// [2<sup>0</sup>..2<sup>1</sup>), which is [1..2). - </span><span class="kw">fn </span>into_float_with_exponent(<span class="self">self</span>, exponent: i32) -> <span class="self">Self</span>::F; -} - -<span class="macro">macro_rules! </span>float_impls { - (<span class="macro-nonterminal">$ty</span>:ident, <span class="macro-nonterminal">$uty</span>:ident, <span class="macro-nonterminal">$f_scalar</span>:ident, <span class="macro-nonterminal">$u_scalar</span>:ty, - <span class="macro-nonterminal">$fraction_bits</span>:expr, <span class="macro-nonterminal">$exponent_bias</span>:expr) => { - <span class="kw">impl </span>IntoFloat <span class="kw">for </span><span class="macro-nonterminal">$uty </span>{ - <span class="kw">type </span>F = <span class="macro-nonterminal">$ty</span>; - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>into_float_with_exponent(<span class="self">self</span>, exponent: i32) -> <span class="macro-nonterminal">$ty </span>{ - <span class="comment">// The exponent is encoded using an offset-binary representation - </span><span class="kw">let </span>exponent_bits: <span class="macro-nonterminal">$u_scalar </span>= - ((<span class="macro-nonterminal">$exponent_bias </span>+ exponent) <span class="kw">as </span><span class="macro-nonterminal">$u_scalar</span>) << <span class="macro-nonterminal">$fraction_bits</span>; - <span class="macro-nonterminal">$ty::from_bits</span>(<span class="self">self </span>| exponent_bits) - } - } - - <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$ty</span>> <span class="kw">for </span>Standard { - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$ty </span>{ - <span class="comment">// Multiply-based method; 24/53 random bits; [0, 1) interval. - // We use the most significant bits because for simple RNGs - // those are usually more random. - </span><span class="kw">let </span>float_size = mem::size_of::<<span class="macro-nonterminal">$f_scalar</span>>() <span class="kw">as </span>u32 * <span class="number">8</span>; - <span class="kw">let </span>precision = <span class="macro-nonterminal">$fraction_bits </span>+ <span class="number">1</span>; - <span class="kw">let </span>scale = <span class="number">1.0 </span>/ ((<span class="number">1 </span><span class="kw">as </span><span class="macro-nonterminal">$u_scalar </span><< precision) <span class="kw">as </span><span class="macro-nonterminal">$f_scalar</span>); - - <span class="kw">let </span>value: <span class="macro-nonterminal">$uty </span>= rng.gen(); - <span class="kw">let </span>value = value >> (float_size - precision); - scale * <span class="macro-nonterminal">$ty::cast_from_int</span>(value) - } - } - - <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$ty</span>> <span class="kw">for </span>OpenClosed01 { - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$ty </span>{ - <span class="comment">// Multiply-based method; 24/53 random bits; (0, 1] interval. - // We use the most significant bits because for simple RNGs - // those are usually more random. - </span><span class="kw">let </span>float_size = mem::size_of::<<span class="macro-nonterminal">$f_scalar</span>>() <span class="kw">as </span>u32 * <span class="number">8</span>; - <span class="kw">let </span>precision = <span class="macro-nonterminal">$fraction_bits </span>+ <span class="number">1</span>; - <span class="kw">let </span>scale = <span class="number">1.0 </span>/ ((<span class="number">1 </span><span class="kw">as </span><span class="macro-nonterminal">$u_scalar </span><< precision) <span class="kw">as </span><span class="macro-nonterminal">$f_scalar</span>); - - <span class="kw">let </span>value: <span class="macro-nonterminal">$uty </span>= rng.gen(); - <span class="kw">let </span>value = value >> (float_size - precision); - <span class="comment">// Add 1 to shift up; will not overflow because of right-shift: - </span>scale * <span class="macro-nonterminal">$ty::cast_from_int</span>(value + <span class="number">1</span>) - } - } - - <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$ty</span>> <span class="kw">for </span>Open01 { - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$ty </span>{ - <span class="comment">// Transmute-based method; 23/52 random bits; (0, 1) interval. - // We use the most significant bits because for simple RNGs - // those are usually more random. - </span><span class="kw">use </span>core::<span class="macro-nonterminal">$f_scalar::EPSILON</span>; - <span class="kw">let </span>float_size = mem::size_of::<<span class="macro-nonterminal">$f_scalar</span>>() <span class="kw">as </span>u32 * <span class="number">8</span>; - - <span class="kw">let </span>value: <span class="macro-nonterminal">$uty </span>= rng.gen(); - <span class="kw">let </span>fraction = value >> (float_size - <span class="macro-nonterminal">$fraction_bits</span>); - fraction.into_float_with_exponent(<span class="number">0</span>) - (<span class="number">1.0 </span>- EPSILON / <span class="number">2.0</span>) - } - } - } -} - -<span class="macro">float_impls! </span>{ f32, u32, f32, u32, <span class="number">23</span>, <span class="number">127 </span>} -<span class="macro">float_impls! </span>{ f64, u64, f64, u64, <span class="number">52</span>, <span class="number">1023 </span>} - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">float_impls! </span>{ f32x2, u32x2, f32, u32, <span class="number">23</span>, <span class="number">127 </span>} -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">float_impls! </span>{ f32x4, u32x4, f32, u32, <span class="number">23</span>, <span class="number">127 </span>} -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">float_impls! </span>{ f32x8, u32x8, f32, u32, <span class="number">23</span>, <span class="number">127 </span>} -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">float_impls! </span>{ f32x16, u32x16, f32, u32, <span class="number">23</span>, <span class="number">127 </span>} - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">float_impls! </span>{ f64x2, u64x2, f64, u64, <span class="number">52</span>, <span class="number">1023 </span>} -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">float_impls! </span>{ f64x4, u64x4, f64, u64, <span class="number">52</span>, <span class="number">1023 </span>} -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">float_impls! </span>{ f64x8, u64x8, f64, u64, <span class="number">52</span>, <span class="number">1023 </span>} - - -<span class="attribute">#[cfg(test)] -</span><span class="kw">mod </span>tests { - <span class="kw">use super</span>::<span class="kw-2">*</span>; - <span class="kw">use </span><span class="kw">crate</span>::rngs::mock::StepRng; - - <span class="kw">const </span>EPSILON32: f32 = ::core::f32::EPSILON; - <span class="kw">const </span>EPSILON64: f64 = ::core::f64::EPSILON; - - <span class="macro">macro_rules! </span>test_f32 { - (<span class="macro-nonterminal">$fnn</span>:ident, <span class="macro-nonterminal">$ty</span>:ident, <span class="macro-nonterminal">$ZERO</span>:expr, <span class="macro-nonterminal">$EPSILON</span>:expr) => { - <span class="attribute">#[test] - </span><span class="kw">fn </span><span class="macro-nonterminal">$fnn</span>() { - <span class="comment">// Standard - </span><span class="kw">let </span><span class="kw-2">mut </span>zeros = StepRng::new(<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(zeros.gen::<<span class="macro-nonterminal">$ty</span>>(), <span class="macro-nonterminal">$ZERO</span>); - <span class="kw">let </span><span class="kw-2">mut </span>one = StepRng::new(<span class="number">1 </span><< <span class="number">8 </span>| <span class="number">1 </span><< (<span class="number">8 </span>+ <span class="number">32</span>), <span class="number">0</span>); - <span class="macro">assert_eq!</span>(one.gen::<<span class="macro-nonterminal">$ty</span>>(), <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0</span>); - <span class="kw">let </span><span class="kw-2">mut </span>max = StepRng::new(!<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(max.gen::<<span class="macro-nonterminal">$ty</span>>(), <span class="number">1.0 </span>- <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0</span>); - - <span class="comment">// OpenClosed01 - </span><span class="kw">let </span><span class="kw-2">mut </span>zeros = StepRng::new(<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(zeros.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(OpenClosed01), <span class="number">0.0 </span>+ <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0</span>); - <span class="kw">let </span><span class="kw-2">mut </span>one = StepRng::new(<span class="number">1 </span><< <span class="number">8 </span>| <span class="number">1 </span><< (<span class="number">8 </span>+ <span class="number">32</span>), <span class="number">0</span>); - <span class="macro">assert_eq!</span>(one.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(OpenClosed01), <span class="macro-nonterminal">$EPSILON</span>); - <span class="kw">let </span><span class="kw-2">mut </span>max = StepRng::new(!<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(max.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(OpenClosed01), <span class="macro-nonterminal">$ZERO </span>+ <span class="number">1.0</span>); - - <span class="comment">// Open01 - </span><span class="kw">let </span><span class="kw-2">mut </span>zeros = StepRng::new(<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(zeros.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(Open01), <span class="number">0.0 </span>+ <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0</span>); - <span class="kw">let </span><span class="kw-2">mut </span>one = StepRng::new(<span class="number">1 </span><< <span class="number">9 </span>| <span class="number">1 </span><< (<span class="number">9 </span>+ <span class="number">32</span>), <span class="number">0</span>); - <span class="macro">assert_eq!</span>(one.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(Open01), <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0 </span>* <span class="number">3.0</span>); - <span class="kw">let </span><span class="kw-2">mut </span>max = StepRng::new(!<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(max.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(Open01), <span class="number">1.0 </span>- <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0</span>); - } - }; - } - <span class="macro">test_f32! </span>{ f32_edge_cases, f32, <span class="number">0.0</span>, EPSILON32 } - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span><span class="macro">test_f32! </span>{ f32x2_edge_cases, f32x2, f32x2::splat(<span class="number">0.0</span>), f32x2::splat(EPSILON32) } - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span><span class="macro">test_f32! </span>{ f32x4_edge_cases, f32x4, f32x4::splat(<span class="number">0.0</span>), f32x4::splat(EPSILON32) } - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span><span class="macro">test_f32! </span>{ f32x8_edge_cases, f32x8, f32x8::splat(<span class="number">0.0</span>), f32x8::splat(EPSILON32) } - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span><span class="macro">test_f32! </span>{ f32x16_edge_cases, f32x16, f32x16::splat(<span class="number">0.0</span>), f32x16::splat(EPSILON32) } - - <span class="macro">macro_rules! </span>test_f64 { - (<span class="macro-nonterminal">$fnn</span>:ident, <span class="macro-nonterminal">$ty</span>:ident, <span class="macro-nonterminal">$ZERO</span>:expr, <span class="macro-nonterminal">$EPSILON</span>:expr) => { - <span class="attribute">#[test] - </span><span class="kw">fn </span><span class="macro-nonterminal">$fnn</span>() { - <span class="comment">// Standard - </span><span class="kw">let </span><span class="kw-2">mut </span>zeros = StepRng::new(<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(zeros.gen::<<span class="macro-nonterminal">$ty</span>>(), <span class="macro-nonterminal">$ZERO</span>); - <span class="kw">let </span><span class="kw-2">mut </span>one = StepRng::new(<span class="number">1 </span><< <span class="number">11</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(one.gen::<<span class="macro-nonterminal">$ty</span>>(), <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0</span>); - <span class="kw">let </span><span class="kw-2">mut </span>max = StepRng::new(!<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(max.gen::<<span class="macro-nonterminal">$ty</span>>(), <span class="number">1.0 </span>- <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0</span>); - - <span class="comment">// OpenClosed01 - </span><span class="kw">let </span><span class="kw-2">mut </span>zeros = StepRng::new(<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(zeros.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(OpenClosed01), <span class="number">0.0 </span>+ <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0</span>); - <span class="kw">let </span><span class="kw-2">mut </span>one = StepRng::new(<span class="number">1 </span><< <span class="number">11</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(one.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(OpenClosed01), <span class="macro-nonterminal">$EPSILON</span>); - <span class="kw">let </span><span class="kw-2">mut </span>max = StepRng::new(!<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(max.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(OpenClosed01), <span class="macro-nonterminal">$ZERO </span>+ <span class="number">1.0</span>); - - <span class="comment">// Open01 - </span><span class="kw">let </span><span class="kw-2">mut </span>zeros = StepRng::new(<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(zeros.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(Open01), <span class="number">0.0 </span>+ <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0</span>); - <span class="kw">let </span><span class="kw-2">mut </span>one = StepRng::new(<span class="number">1 </span><< <span class="number">12</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(one.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(Open01), <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0 </span>* <span class="number">3.0</span>); - <span class="kw">let </span><span class="kw-2">mut </span>max = StepRng::new(!<span class="number">0</span>, <span class="number">0</span>); - <span class="macro">assert_eq!</span>(max.sample::<<span class="macro-nonterminal">$ty</span>, <span class="kw">_</span>>(Open01), <span class="number">1.0 </span>- <span class="macro-nonterminal">$EPSILON </span>/ <span class="number">2.0</span>); - } - }; - } - <span class="macro">test_f64! </span>{ f64_edge_cases, f64, <span class="number">0.0</span>, EPSILON64 } - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span><span class="macro">test_f64! </span>{ f64x2_edge_cases, f64x2, f64x2::splat(<span class="number">0.0</span>), f64x2::splat(EPSILON64) } - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span><span class="macro">test_f64! </span>{ f64x4_edge_cases, f64x4, f64x4::splat(<span class="number">0.0</span>), f64x4::splat(EPSILON64) } - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span><span class="macro">test_f64! </span>{ f64x8_edge_cases, f64x8, f64x8::splat(<span class="number">0.0</span>), f64x8::splat(EPSILON64) } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>value_stability() { - <span class="kw">fn </span>test_samples<T: Copy + core::fmt::Debug + PartialEq, D: Distribution<T>>( - distr: <span class="kw-2">&</span>D, zero: T, expected: <span class="kw-2">&</span>[T], - ) { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">0x6f44f5646c2a7334</span>); - <span class="kw">let </span><span class="kw-2">mut </span>buf = [zero; <span class="number">3</span>]; - <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&mut </span>buf { - <span class="kw-2">*</span>x = rng.sample(<span class="kw-2">&</span>distr); - } - <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf, expected); - } - - test_samples(<span class="kw-2">&</span>Standard, <span class="number">0f32</span>, <span class="kw-2">&</span>[<span class="number">0.0035963655</span>, <span class="number">0.7346052</span>, <span class="number">0.09778172</span>]); - test_samples(<span class="kw-2">&</span>Standard, <span class="number">0f64</span>, <span class="kw-2">&</span>[ - <span class="number">0.7346051961657583</span>, - <span class="number">0.20298547462974248</span>, - <span class="number">0.8166436635290655</span>, - ]); - - test_samples(<span class="kw-2">&</span>OpenClosed01, <span class="number">0f32</span>, <span class="kw-2">&</span>[<span class="number">0.003596425</span>, <span class="number">0.73460525</span>, <span class="number">0.09778178</span>]); - test_samples(<span class="kw-2">&</span>OpenClosed01, <span class="number">0f64</span>, <span class="kw-2">&</span>[ - <span class="number">0.7346051961657584</span>, - <span class="number">0.2029854746297426</span>, - <span class="number">0.8166436635290656</span>, - ]); - - test_samples(<span class="kw-2">&</span>Open01, <span class="number">0f32</span>, <span class="kw-2">&</span>[<span class="number">0.0035963655</span>, <span class="number">0.73460525</span>, <span class="number">0.09778172</span>]); - test_samples(<span class="kw-2">&</span>Open01, <span class="number">0f64</span>, <span class="kw-2">&</span>[ - <span class="number">0.7346051961657584</span>, - <span class="number">0.20298547462974248</span>, - <span class="number">0.8166436635290656</span>, - ]); - - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span>{ - <span class="comment">// We only test a sub-set of types here. Values are identical to - // non-SIMD types; we assume this pattern continues across all - // SIMD types. - - </span>test_samples(<span class="kw-2">&</span>Standard, f32x2::new(<span class="number">0.0</span>, <span class="number">0.0</span>), <span class="kw-2">&</span>[ - f32x2::new(<span class="number">0.0035963655</span>, <span class="number">0.7346052</span>), - f32x2::new(<span class="number">0.09778172</span>, <span class="number">0.20298547</span>), - f32x2::new(<span class="number">0.34296435</span>, <span class="number">0.81664366</span>), - ]); - - test_samples(<span class="kw-2">&</span>Standard, f64x2::new(<span class="number">0.0</span>, <span class="number">0.0</span>), <span class="kw-2">&</span>[ - f64x2::new(<span class="number">0.7346051961657583</span>, <span class="number">0.20298547462974248</span>), - f64x2::new(<span class="number">0.8166436635290655</span>, <span class="number">0.7423708925400552</span>), - f64x2::new(<span class="number">0.16387782224016323</span>, <span class="number">0.9087068770169618</span>), - ]); - } - } -} -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/integer.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/integer.rs.html deleted file mode 100644 index 0fbac64..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/integer.rs.html +++ /dev/null @@ -1,551 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/integer.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>integer.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" 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src="../../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> -<span id="2">2</span> -<span id="3">3</span> -<span id="4">4</span> -<span id="5">5</span> -<span id="6">6</span> -<span id="7">7</span> -<span id="8">8</span> -<span id="9">9</span> -<span id="10">10</span> -<span id="11">11</span> -<span id="12">12</span> -<span id="13">13</span> -<span id="14">14</span> -<span id="15">15</span> -<span id="16">16</span> -<span id="17">17</span> -<span id="18">18</span> -<span id="19">19</span> -<span id="20">20</span> -<span id="21">21</span> -<span id="22">22</span> -<span id="23">23</span> -<span id="24">24</span> -<span id="25">25</span> -<span id="26">26</span> -<span id="27">27</span> -<span id="28">28</span> -<span id="29">29</span> -<span id="30">30</span> -<span id="31">31</span> -<span id="32">32</span> -<span id="33">33</span> -<span id="34">34</span> -<span 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This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! The implementations of the `Standard` distribution for integer types. - -</span><span class="kw">use </span><span class="kw">crate</span>::distributions::{Distribution, Standard}; -<span class="kw">use </span><span class="kw">crate</span>::Rng; -<span class="attribute">#[cfg(all(target_arch = <span class="string">"x86"</span>, feature = <span class="string">"simd_support"</span>))] -</span><span class="kw">use </span>core::arch::x86::{__m128i, __m256i}; -<span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, feature = <span class="string">"simd_support"</span>))] -</span><span class="kw">use </span>core::arch::x86_64::{__m128i, __m256i}; -<span class="kw">use </span>core::num::{NonZeroU16, NonZeroU32, NonZeroU64, NonZeroU8, NonZeroUsize, - NonZeroU128}; -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] </span><span class="kw">use </span>packed_simd::<span class="kw-2">*</span>; - -<span class="kw">impl </span>Distribution<u8> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u8 { - rng.next_u32() <span class="kw">as </span>u8 - } -} - -<span class="kw">impl </span>Distribution<u16> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u16 { - rng.next_u32() <span class="kw">as </span>u16 - } -} - -<span class="kw">impl </span>Distribution<u32> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u32 { - rng.next_u32() - } -} - -<span class="kw">impl </span>Distribution<u64> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u64 { - rng.next_u64() - } -} - -<span class="kw">impl </span>Distribution<u128> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u128 { - <span class="comment">// Use LE; we explicitly generate one value before the next. - </span><span class="kw">let </span>x = u128::from(rng.next_u64()); - <span class="kw">let </span>y = u128::from(rng.next_u64()); - (y << <span class="number">64</span>) | x - } -} - -<span class="kw">impl </span>Distribution<usize> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - #[cfg(any(target_pointer_width = <span class="string">"32"</span>, target_pointer_width = <span class="string">"16"</span>))] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> usize { - rng.next_u32() <span class="kw">as </span>usize - } - - <span class="attribute">#[inline] - #[cfg(target_pointer_width = <span class="string">"64"</span>)] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> usize { - rng.next_u64() <span class="kw">as </span>usize - } -} - -<span class="macro">macro_rules! </span>impl_int_from_uint { - (<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$uty</span>:ty) => { - <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$ty</span>> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$ty </span>{ - rng.gen::<<span class="macro-nonterminal">$uty</span>>() <span class="kw">as </span><span class="macro-nonterminal">$ty - </span>} - } - }; -} - -<span class="macro">impl_int_from_uint! </span>{ i8, u8 } -<span class="macro">impl_int_from_uint! </span>{ i16, u16 } -<span class="macro">impl_int_from_uint! </span>{ i32, u32 } -<span class="macro">impl_int_from_uint! </span>{ i64, u64 } -<span class="macro">impl_int_from_uint! </span>{ i128, u128 } -<span class="macro">impl_int_from_uint! </span>{ isize, usize } - -<span class="macro">macro_rules! </span>impl_nzint { - (<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$new</span>:path) => { - <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$ty</span>> <span class="kw">for </span>Standard { - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$ty </span>{ - <span class="kw">loop </span>{ - <span class="kw">if let </span><span class="prelude-val">Some</span>(nz) = <span class="macro-nonterminal">$new</span>(rng.gen()) { - <span class="kw">break </span>nz; - } - } - } - } - }; -} - -<span class="macro">impl_nzint!</span>(NonZeroU8, NonZeroU8::new); -<span class="macro">impl_nzint!</span>(NonZeroU16, NonZeroU16::new); -<span class="macro">impl_nzint!</span>(NonZeroU32, NonZeroU32::new); -<span class="macro">impl_nzint!</span>(NonZeroU64, NonZeroU64::new); -<span class="macro">impl_nzint!</span>(NonZeroU128, NonZeroU128::new); -<span class="macro">impl_nzint!</span>(NonZeroUsize, NonZeroUsize::new); - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">macro_rules! </span>simd_impl { - ($((<span class="macro-nonterminal">$intrinsic</span>:ident, <span class="macro-nonterminal">$vec</span>:ty),)+) => {$( - <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$intrinsic</span>> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$intrinsic </span>{ - <span class="macro-nonterminal">$intrinsic::from_bits</span>(rng.gen::<<span class="macro-nonterminal">$vec</span>>()) - } - } - )+}; - - (<span class="macro-nonterminal">$bits</span>:expr,) => {}; - (<span class="macro-nonterminal">$bits</span>:expr, <span class="macro-nonterminal">$ty</span>:ty, $(<span class="macro-nonterminal">$ty_more</span>:ty,)<span class="kw-2">*</span>) => { - <span class="macro">simd_impl!</span>(<span class="macro-nonterminal">$bits</span>, $(<span class="macro-nonterminal">$ty_more</span>,)<span class="kw-2">*</span>); - - <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$ty</span>> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$ty </span>{ - <span class="kw">let </span><span class="kw-2">mut </span>vec: <span class="macro-nonterminal">$ty </span>= Default::default(); - <span class="kw">unsafe </span>{ - <span class="kw">let </span>ptr = <span class="kw-2">&mut </span>vec; - <span class="kw">let </span>b_ptr = <span class="kw-2">&mut *</span>(ptr <span class="kw">as </span><span class="kw-2">*mut </span><span class="macro-nonterminal">$ty </span><span class="kw">as </span><span class="kw-2">*mut </span>[u8; <span class="macro-nonterminal">$bits</span>/<span class="number">8</span>]); - rng.fill_bytes(b_ptr); - } - vec.to_le() - } - } - }; -} - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">simd_impl!</span>(<span class="number">16</span>, u8x2, i8x2,); -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">simd_impl!</span>(<span class="number">32</span>, u8x4, i8x4, u16x2, i16x2,); -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">simd_impl!</span>(<span class="number">64</span>, u8x8, i8x8, u16x4, i16x4, u32x2, i32x2,); -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">simd_impl!</span>(<span class="number">128</span>, u8x16, i8x16, u16x8, i16x8, u32x4, i32x4, u64x2, i64x2,); -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">simd_impl!</span>(<span class="number">256</span>, u8x32, i8x32, u16x16, i16x16, u32x8, i32x8, u64x4, i64x4,); -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">simd_impl!</span>(<span class="number">512</span>, u8x64, i8x64, u16x32, i16x32, u32x16, i32x16, u64x8, i64x8,); -<span class="attribute">#[cfg(all( - feature = <span class="string">"simd_support"</span>, - any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>) -))] -</span><span class="macro">simd_impl!</span>((__m128i, u8x16), (__m256i, u8x32),); - -<span class="attribute">#[cfg(test)] -</span><span class="kw">mod </span>tests { - <span class="kw">use super</span>::<span class="kw-2">*</span>; - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_integers() { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">806</span>); - - rng.sample::<isize, <span class="kw">_</span>>(Standard); - rng.sample::<i8, <span class="kw">_</span>>(Standard); - rng.sample::<i16, <span class="kw">_</span>>(Standard); - rng.sample::<i32, <span class="kw">_</span>>(Standard); - rng.sample::<i64, <span class="kw">_</span>>(Standard); - rng.sample::<i128, <span class="kw">_</span>>(Standard); - - rng.sample::<usize, <span class="kw">_</span>>(Standard); - rng.sample::<u8, <span class="kw">_</span>>(Standard); - rng.sample::<u16, <span class="kw">_</span>>(Standard); - rng.sample::<u32, <span class="kw">_</span>>(Standard); - rng.sample::<u64, <span class="kw">_</span>>(Standard); - rng.sample::<u128, <span class="kw">_</span>>(Standard); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>value_stability() { - <span class="kw">fn </span>test_samples<T: Copy + core::fmt::Debug + PartialEq>(zero: T, expected: <span class="kw-2">&</span>[T]) - <span class="kw">where </span>Standard: Distribution<T> { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">807</span>); - <span class="kw">let </span><span class="kw-2">mut </span>buf = [zero; <span class="number">3</span>]; - <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&mut </span>buf { - <span class="kw-2">*</span>x = rng.sample(Standard); - } - <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf, expected); - } - - test_samples(<span class="number">0u8</span>, <span class="kw-2">&</span>[<span class="number">9</span>, <span class="number">247</span>, <span class="number">111</span>]); - test_samples(<span class="number">0u16</span>, <span class="kw-2">&</span>[<span class="number">32265</span>, <span class="number">42999</span>, <span class="number">38255</span>]); - test_samples(<span class="number">0u32</span>, <span class="kw-2">&</span>[<span class="number">2220326409</span>, <span class="number">2575017975</span>, <span class="number">2018088303</span>]); - test_samples(<span class="number">0u64</span>, <span class="kw-2">&</span>[ - <span class="number">11059617991457472009</span>, - <span class="number">16096616328739788143</span>, - <span class="number">1487364411147516184</span>, - ]); - test_samples(<span class="number">0u128</span>, <span class="kw-2">&</span>[ - <span class="number">296930161868957086625409848350820761097</span>, - <span class="number">145644820879247630242265036535529306392</span>, - <span class="number">111087889832015897993126088499035356354</span>, - ]); - <span class="attribute">#[cfg(any(target_pointer_width = <span class="string">"32"</span>, target_pointer_width = <span class="string">"16"</span>))] - </span>test_samples(<span class="number">0usize</span>, <span class="kw-2">&</span>[<span class="number">2220326409</span>, <span class="number">2575017975</span>, <span class="number">2018088303</span>]); - <span class="attribute">#[cfg(target_pointer_width = <span class="string">"64"</span>)] - </span>test_samples(<span class="number">0usize</span>, <span class="kw-2">&</span>[ - <span class="number">11059617991457472009</span>, - <span class="number">16096616328739788143</span>, - <span class="number">1487364411147516184</span>, - ]); - - test_samples(<span class="number">0i8</span>, <span class="kw-2">&</span>[<span class="number">9</span>, -<span class="number">9</span>, <span class="number">111</span>]); - <span class="comment">// Skip further i* types: they are simple reinterpretation of u* samples - - </span><span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span>{ - <span class="comment">// We only test a sub-set of types here and make assumptions about the rest. - - </span>test_samples(u8x2::default(), <span class="kw-2">&</span>[ - u8x2::new(<span class="number">9</span>, <span class="number">126</span>), - u8x2::new(<span class="number">247</span>, <span class="number">167</span>), - u8x2::new(<span class="number">111</span>, <span class="number">149</span>), - ]); - test_samples(u8x4::default(), <span class="kw-2">&</span>[ - u8x4::new(<span class="number">9</span>, <span class="number">126</span>, <span class="number">87</span>, <span class="number">132</span>), - u8x4::new(<span class="number">247</span>, <span class="number">167</span>, <span class="number">123</span>, <span class="number">153</span>), - u8x4::new(<span class="number">111</span>, <span class="number">149</span>, <span class="number">73</span>, <span class="number">120</span>), - ]); - test_samples(u8x8::default(), <span class="kw-2">&</span>[ - u8x8::new(<span class="number">9</span>, <span class="number">126</span>, <span class="number">87</span>, <span class="number">132</span>, <span class="number">247</span>, <span class="number">167</span>, <span class="number">123</span>, <span class="number">153</span>), - u8x8::new(<span class="number">111</span>, <span class="number">149</span>, <span class="number">73</span>, <span class="number">120</span>, <span class="number">68</span>, <span class="number">171</span>, <span class="number">98</span>, <span class="number">223</span>), - u8x8::new(<span class="number">24</span>, <span class="number">121</span>, <span class="number">1</span>, <span class="number">50</span>, <span class="number">13</span>, <span class="number">46</span>, <span class="number">164</span>, <span class="number">20</span>), - ]); - - test_samples(i64x8::default(), <span class="kw-2">&</span>[ - i64x8::new( - -<span class="number">7387126082252079607</span>, - -<span class="number">2350127744969763473</span>, - <span class="number">1487364411147516184</span>, - <span class="number">7895421560427121838</span>, - <span class="number">602190064936008898</span>, - <span class="number">6022086574635100741</span>, - -<span class="number">5080089175222015595</span>, - -<span class="number">4066367846667249123</span>, - ), - i64x8::new( - <span class="number">9180885022207963908</span>, - <span class="number">3095981199532211089</span>, - <span class="number">6586075293021332726</span>, - <span class="number">419343203796414657</span>, - <span class="number">3186951873057035255</span>, - <span class="number">5287129228749947252</span>, - <span class="number">444726432079249540</span>, - -<span class="number">1587028029513790706</span>, - ), - i64x8::new( - <span class="number">6075236523189346388</span>, - <span class="number">1351763722368165432</span>, - -<span class="number">6192309979959753740</span>, - -<span class="number">7697775502176768592</span>, - -<span class="number">4482022114172078123</span>, - <span class="number">7522501477800909500</span>, - -<span class="number">1837258847956201231</span>, - -<span class="number">586926753024886735</span>, - ), - ]); - } - } -} -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/mod.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/mod.rs.html deleted file mode 100644 index 8e93c46..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/mod.rs.html +++ /dev/null @@ -1,439 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" 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src="../../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> -<span id="2">2</span> -<span id="3">3</span> -<span id="4">4</span> -<span id="5">5</span> -<span id="6">6</span> -<span id="7">7</span> -<span id="8">8</span> -<span id="9">9</span> -<span id="10">10</span> -<span id="11">11</span> -<span id="12">12</span> -<span id="13">13</span> -<span id="14">14</span> -<span id="15">15</span> -<span id="16">16</span> -<span id="17">17</span> -<span id="18">18</span> -<span id="19">19</span> -<span id="20">20</span> -<span id="21">21</span> -<span id="22">22</span> -<span id="23">23</span> -<span id="24">24</span> -<span id="25">25</span> -<span id="26">26</span> -<span id="27">27</span> -<span id="28">28</span> -<span id="29">29</span> -<span id="30">30</span> -<span id="31">31</span> -<span id="32">32</span> -<span id="33">33</span> -<span id="34">34</span> -<span 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-<span id="188">188</span> -<span id="189">189</span> -<span id="190">190</span> -<span id="191">191</span> -<span id="192">192</span> -<span id="193">193</span> -<span id="194">194</span> -<span id="195">195</span> -<span id="196">196</span> -<span id="197">197</span> -<span id="198">198</span> -<span id="199">199</span> -<span id="200">200</span> -<span id="201">201</span> -<span id="202">202</span> -<span id="203">203</span> -<span id="204">204</span> -<span id="205">205</span> -<span id="206">206</span> -<span id="207">207</span> -<span id="208">208</span> -<span id="209">209</span> -<span id="210">210</span> -<span id="211">211</span> -<span id="212">212</span> -<span id="213">213</span> -<span id="214">214</span> -<span id="215">215</span> -<span id="216">216</span> -<span id="217">217</span> -<span id="218">218</span> -</pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project. -// Copyright 2013-2017 The Rust Project Developers. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! Generating random samples from probability distributions -//! -//! This module is the home of the [`Distribution`] trait and several of its -//! implementations. It is the workhorse behind some of the convenient -//! functionality of the [`Rng`] trait, e.g. [`Rng::gen`] and of course -//! [`Rng::sample`]. -//! -//! Abstractly, a [probability distribution] describes the probability of -//! occurrence of each value in its sample space. -//! -//! More concretely, an implementation of `Distribution<T>` for type `X` is an -//! algorithm for choosing values from the sample space (a subset of `T`) -//! according to the distribution `X` represents, using an external source of -//! randomness (an RNG supplied to the `sample` function). -//! -//! A type `X` may implement `Distribution<T>` for multiple types `T`. -//! Any type implementing [`Distribution`] is stateless (i.e. immutable), -//! but it may have internal parameters set at construction time (for example, -//! [`Uniform`] allows specification of its sample space as a range within `T`). -//! -//! -//! # The `Standard` distribution -//! -//! The [`Standard`] distribution is important to mention. This is the -//! distribution used by [`Rng::gen`] and represents the "default" way to -//! produce a random value for many different types, including most primitive -//! types, tuples, arrays, and a few derived types. See the documentation of -//! [`Standard`] for more details. -//! -//! Implementing `Distribution<T>` for [`Standard`] for user types `T` makes it -//! possible to generate type `T` with [`Rng::gen`], and by extension also -//! with the [`random`] function. -//! -//! ## Random characters -//! -//! [`Alphanumeric`] is a simple distribution to sample random letters and -//! numbers of the `char` type; in contrast [`Standard`] may sample any valid -//! `char`. -//! -//! -//! # Uniform numeric ranges -//! -//! The [`Uniform`] distribution is more flexible than [`Standard`], but also -//! more specialised: it supports fewer target types, but allows the sample -//! space to be specified as an arbitrary range within its target type `T`. -//! Both [`Standard`] and [`Uniform`] are in some sense uniform distributions. -//! -//! Values may be sampled from this distribution using [`Rng::sample(Range)`] or -//! by creating a distribution object with [`Uniform::new`], -//! [`Uniform::new_inclusive`] or `From<Range>`. When the range limits are not -//! known at compile time it is typically faster to reuse an existing -//! `Uniform` object than to call [`Rng::sample(Range)`]. -//! -//! User types `T` may also implement `Distribution<T>` for [`Uniform`], -//! although this is less straightforward than for [`Standard`] (see the -//! documentation in the [`uniform`] module). Doing so enables generation of -//! values of type `T` with [`Rng::sample(Range)`]. -//! -//! ## Open and half-open ranges -//! -//! There are surprisingly many ways to uniformly generate random floats. A -//! range between 0 and 1 is standard, but the exact bounds (open vs closed) -//! and accuracy differ. In addition to the [`Standard`] distribution Rand offers -//! [`Open01`] and [`OpenClosed01`]. See "Floating point implementation" section of -//! [`Standard`] documentation for more details. -//! -//! # Non-uniform sampling -//! -//! Sampling a simple true/false outcome with a given probability has a name: -//! the [`Bernoulli`] distribution (this is used by [`Rng::gen_bool`]). -//! -//! For weighted sampling from a sequence of discrete values, use the -//! [`WeightedIndex`] distribution. -//! -//! This crate no longer includes other non-uniform distributions; instead -//! it is recommended that you use either [`rand_distr`] or [`statrs`]. -//! -//! -//! [probability distribution]: https://en.wikipedia.org/wiki/Probability_distribution -//! [`rand_distr`]: https://crates.io/crates/rand_distr -//! [`statrs`]: https://crates.io/crates/statrs - -//! [`random`]: crate::random -//! [`rand_distr`]: https://crates.io/crates/rand_distr -//! [`statrs`]: https://crates.io/crates/statrs - -</span><span class="kw">mod </span>bernoulli; -<span class="kw">mod </span>distribution; -<span class="kw">mod </span>float; -<span class="kw">mod </span>integer; -<span class="kw">mod </span>other; -<span class="kw">mod </span>slice; -<span class="kw">mod </span>utils; -<span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] -</span><span class="kw">mod </span>weighted_index; - -<span class="attribute">#[doc(hidden)] -</span><span class="kw">pub mod </span>hidden_export { - <span class="kw">pub use </span><span class="kw">super</span>::float::IntoFloat; <span class="comment">// used by rand_distr -</span>} -<span class="kw">pub mod </span>uniform; -<span class="attribute">#[deprecated( - since = <span class="string">"0.8.0"</span>, - note = <span class="string">"use rand::distributions::{WeightedIndex, WeightedError} instead" -</span>)] -#[cfg(feature = <span class="string">"alloc"</span>)] -#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"alloc"</span>)))] -</span><span class="kw">pub mod </span>weighted; - -<span class="kw">pub use </span><span class="self">self</span>::bernoulli::{Bernoulli, BernoulliError}; -<span class="kw">pub use </span><span class="self">self</span>::distribution::{Distribution, DistIter, DistMap}; -<span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] -</span><span class="kw">pub use </span><span class="self">self</span>::distribution::DistString; -<span class="kw">pub use </span><span class="self">self</span>::float::{Open01, OpenClosed01}; -<span class="kw">pub use </span><span class="self">self</span>::other::Alphanumeric; -<span class="kw">pub use </span><span class="self">self</span>::slice::Slice; -<span class="attribute">#[doc(inline)] -</span><span class="kw">pub use </span><span class="self">self</span>::uniform::Uniform; -<span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] -</span><span class="kw">pub use </span><span class="self">self</span>::weighted_index::{WeightedError, WeightedIndex}; - -<span class="attribute">#[allow(unused)] -</span><span class="kw">use </span><span class="kw">crate</span>::Rng; - -<span class="doccomment">/// A generic random value distribution, implemented for many primitive types. -/// Usually generates values with a numerically uniform distribution, and with a -/// range appropriate to the type. -/// -/// ## Provided implementations -/// -/// Assuming the provided `Rng` is well-behaved, these implementations -/// generate values with the following ranges and distributions: -/// -/// * Integers (`i32`, `u32`, `isize`, `usize`, etc.): Uniformly distributed -/// over all values of the type. -/// * `char`: Uniformly distributed over all Unicode scalar values, i.e. all -/// code points in the range `0...0x10_FFFF`, except for the range -/// `0xD800...0xDFFF` (the surrogate code points). This includes -/// unassigned/reserved code points. -/// * `bool`: Generates `false` or `true`, each with probability 0.5. -/// * Floating point types (`f32` and `f64`): Uniformly distributed in the -/// half-open range `[0, 1)`. See notes below. -/// * Wrapping integers (`Wrapping<T>`), besides the type identical to their -/// normal integer variants. -/// -/// The `Standard` distribution also supports generation of the following -/// compound types where all component types are supported: -/// -/// * Tuples (up to 12 elements): each element is generated sequentially. -/// * Arrays (up to 32 elements): each element is generated sequentially; -/// see also [`Rng::fill`] which supports arbitrary array length for integer -/// and float types and tends to be faster for `u32` and smaller types. -/// When using `rustc` ≥ 1.51, enable the `min_const_gen` feature to support -/// arrays larger than 32 elements. -/// Note that [`Rng::fill`] and `Standard`'s array support are *not* equivalent: -/// the former is optimised for integer types (using fewer RNG calls for -/// element types smaller than the RNG word size), while the latter supports -/// any element type supported by `Standard`. -/// * `Option<T>` first generates a `bool`, and if true generates and returns -/// `Some(value)` where `value: T`, otherwise returning `None`. -/// -/// ## Custom implementations -/// -/// The [`Standard`] distribution may be implemented for user types as follows: -/// -/// ``` -/// # #![allow(dead_code)] -/// use rand::Rng; -/// use rand::distributions::{Distribution, Standard}; -/// -/// struct MyF32 { -/// x: f32, -/// } -/// -/// impl Distribution<MyF32> for Standard { -/// fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> MyF32 { -/// MyF32 { x: rng.gen() } -/// } -/// } -/// ``` -/// -/// ## Example usage -/// ``` -/// use rand::prelude::*; -/// use rand::distributions::Standard; -/// -/// let val: f32 = StdRng::from_entropy().sample(Standard); -/// println!("f32 from [0, 1): {}", val); -/// ``` -/// -/// # Floating point implementation -/// The floating point implementations for `Standard` generate a random value in -/// the half-open interval `[0, 1)`, i.e. including 0 but not 1. -/// -/// All values that can be generated are of the form `n * ε/2`. For `f32` -/// the 24 most significant random bits of a `u32` are used and for `f64` the -/// 53 most significant bits of a `u64` are used. The conversion uses the -/// multiplicative method: `(rng.gen::<$uty>() >> N) as $ty * (ε/2)`. -/// -/// See also: [`Open01`] which samples from `(0, 1)`, [`OpenClosed01`] which -/// samples from `(0, 1]` and `Rng::gen_range(0..1)` which also samples from -/// `[0, 1)`. Note that `Open01` uses transmute-based methods which yield 1 bit -/// less precision but may perform faster on some architectures (on modern Intel -/// CPUs all methods have approximately equal performance). -/// -/// [`Uniform`]: uniform::Uniform -</span><span class="attribute">#[derive(Clone, Copy, Debug)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(serde::Serialize, serde::Deserialize))] -</span><span class="kw">pub struct </span>Standard; -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/other.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/other.rs.html deleted file mode 100644 index 415f1da..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/other.rs.html +++ /dev/null @@ -1,733 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/other.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>other.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" 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src="../../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> -<span id="2">2</span> -<span id="3">3</span> -<span id="4">4</span> -<span id="5">5</span> -<span id="6">6</span> -<span id="7">7</span> -<span id="8">8</span> -<span id="9">9</span> -<span id="10">10</span> -<span id="11">11</span> -<span id="12">12</span> -<span id="13">13</span> -<span id="14">14</span> -<span id="15">15</span> -<span id="16">16</span> -<span id="17">17</span> -<span id="18">18</span> -<span id="19">19</span> -<span id="20">20</span> -<span id="21">21</span> -<span id="22">22</span> -<span id="23">23</span> -<span id="24">24</span> -<span id="25">25</span> -<span id="26">26</span> -<span id="27">27</span> -<span id="28">28</span> -<span id="29">29</span> -<span id="30">30</span> -<span id="31">31</span> -<span id="32">32</span> -<span id="33">33</span> -<span id="34">34</span> -<span 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https://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! The implementations of the `Standard` distribution for other built-in types. - -</span><span class="kw">use </span>core::char; -<span class="kw">use </span>core::num::Wrapping; -<span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] -</span><span class="kw">use </span>alloc::string::String; - -<span class="kw">use </span><span class="kw">crate</span>::distributions::{Distribution, Standard, Uniform}; -<span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] -</span><span class="kw">use </span><span class="kw">crate</span>::distributions::DistString; -<span class="kw">use </span><span class="kw">crate</span>::Rng; - -<span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] -</span><span class="kw">use </span>serde::{Serialize, Deserialize}; -<span class="attribute">#[cfg(feature = <span class="string">"min_const_gen"</span>)] -</span><span class="kw">use </span>core::mem::{<span class="self">self</span>, MaybeUninit}; - - -<span class="comment">// ----- Sampling distributions ----- - -</span><span class="doccomment">/// Sample a `u8`, uniformly distributed over ASCII letters and numbers: -/// a-z, A-Z and 0-9. -/// -/// # Example -/// -/// ``` -/// use rand::{Rng, thread_rng}; -/// use rand::distributions::Alphanumeric; -/// -/// let mut rng = thread_rng(); -/// let chars: String = (0..7).map(|_| rng.sample(Alphanumeric) as char).collect(); -/// println!("Random chars: {}", chars); -/// ``` -/// -/// The [`DistString`] trait provides an easier method of generating -/// a random `String`, and offers more efficient allocation: -/// ``` -/// use rand::distributions::{Alphanumeric, DistString}; -/// let string = Alphanumeric.sample_string(&mut rand::thread_rng(), 16); -/// println!("Random string: {}", string); -/// ``` -/// -/// # Passwords -/// -/// Users sometimes ask whether it is safe to use a string of random characters -/// as a password. In principle, all RNGs in Rand implementing `CryptoRng` are -/// suitable as a source of randomness for generating passwords (if they are -/// properly seeded), but it is more conservative to only use randomness -/// directly from the operating system via the `getrandom` crate, or the -/// corresponding bindings of a crypto library. -/// -/// When generating passwords or keys, it is important to consider the threat -/// model and in some cases the memorability of the password. This is out of -/// scope of the Rand project, and therefore we defer to the following -/// references: -/// -/// - [Wikipedia article on Password Strength](https://en.wikipedia.org/wiki/Password_strength) -/// - [Diceware for generating memorable passwords](https://en.wikipedia.org/wiki/Diceware) -</span><span class="attribute">#[derive(Debug, Clone, Copy)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -</span><span class="kw">pub struct </span>Alphanumeric; - - -<span class="comment">// ----- Implementations of distributions ----- - -</span><span class="kw">impl </span>Distribution<char> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> char { - <span class="comment">// A valid `char` is either in the interval `[0, 0xD800)` or - // `(0xDFFF, 0x11_0000)`. All `char`s must therefore be in - // `[0, 0x11_0000)` but not in the "gap" `[0xD800, 0xDFFF]` which is - // reserved for surrogates. This is the size of that gap. - </span><span class="kw">const </span>GAP_SIZE: u32 = <span class="number">0xDFFF </span>- <span class="number">0xD800 </span>+ <span class="number">1</span>; - - <span class="comment">// Uniform::new(0, 0x11_0000 - GAP_SIZE) can also be used but it - // seemed slower. - </span><span class="kw">let </span>range = Uniform::new(GAP_SIZE, <span class="number">0x11_0000</span>); - - <span class="kw">let </span><span class="kw-2">mut </span>n = range.sample(rng); - <span class="kw">if </span>n <= <span class="number">0xDFFF </span>{ - n -= GAP_SIZE; - } - <span class="kw">unsafe </span>{ char::from_u32_unchecked(n) } - } -} - -<span class="doccomment">/// Note: the `String` is potentially left with excess capacity; optionally the -/// user may call `string.shrink_to_fit()` afterwards. -</span><span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] -</span><span class="kw">impl </span>DistString <span class="kw">for </span>Standard { - <span class="kw">fn </span>append_string<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R, s: <span class="kw-2">&mut </span>String, len: usize) { - <span class="comment">// A char is encoded with at most four bytes, thus this reservation is - // guaranteed to be sufficient. We do not shrink_to_fit afterwards so - // that repeated usage on the same `String` buffer does not reallocate. - </span>s.reserve(<span class="number">4 </span>* len); - s.extend(Distribution::<char>::sample_iter(<span class="self">self</span>, rng).take(len)); - } -} - -<span class="kw">impl </span>Distribution<u8> <span class="kw">for </span>Alphanumeric { - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u8 { - <span class="kw">const </span>RANGE: u32 = <span class="number">26 </span>+ <span class="number">26 </span>+ <span class="number">10</span>; - <span class="kw">const </span>GEN_ASCII_STR_CHARSET: <span class="kw-2">&</span>[u8] = <span class="string">b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\ - abcdefghijklmnopqrstuvwxyz\ - 0123456789"</span>; - <span class="comment">// We can pick from 62 characters. This is so close to a power of 2, 64, - // that we can do better than `Uniform`. Use a simple bitshift and - // rejection sampling. We do not use a bitmask, because for small RNGs - // the most significant bits are usually of higher quality. - </span><span class="kw">loop </span>{ - <span class="kw">let </span>var = rng.next_u32() >> (<span class="number">32 </span>- <span class="number">6</span>); - <span class="kw">if </span>var < RANGE { - <span class="kw">return </span>GEN_ASCII_STR_CHARSET[var <span class="kw">as </span>usize]; - } - } - } -} - -<span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] -</span><span class="kw">impl </span>DistString <span class="kw">for </span>Alphanumeric { - <span class="kw">fn </span>append_string<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R, string: <span class="kw-2">&mut </span>String, len: usize) { - <span class="kw">unsafe </span>{ - <span class="kw">let </span>v = string.as_mut_vec(); - v.extend(<span class="self">self</span>.sample_iter(rng).take(len)); - } - } -} - -<span class="kw">impl </span>Distribution<bool> <span class="kw">for </span>Standard { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> bool { - <span class="comment">// We can compare against an arbitrary bit of an u32 to get a bool. - // Because the least significant bits of a lower quality RNG can have - // simple patterns, we compare against the most significant bit. This is - // easiest done using a sign test. - </span>(rng.next_u32() <span class="kw">as </span>i32) < <span class="number">0 - </span>} -} - -<span class="macro">macro_rules! </span>tuple_impl { - <span class="comment">// use variables to indicate the arity of the tuple - </span>($(<span class="macro-nonterminal">$tyvar</span>:ident),* ) => { - <span class="comment">// the trailing commas are for the 1 tuple - </span><span class="kw">impl</span>< $( <span class="macro-nonterminal">$tyvar </span>),* > - Distribution<( $( <span class="macro-nonterminal">$tyvar </span>),* , )> - <span class="kw">for </span>Standard - <span class="kw">where </span>$( Standard: Distribution<<span class="macro-nonterminal">$tyvar</span>> ),* - { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, _rng: <span class="kw-2">&mut </span>R) -> ( $( <span class="macro-nonterminal">$tyvar </span>),* , ) { - ( - <span class="comment">// use the $tyvar's to get the appropriate number of - // repeats (they're not actually needed) - </span>$( - _rng.gen::<<span class="macro-nonterminal">$tyvar</span>>() - ),* - , - ) - } - } - } -} - -<span class="kw">impl </span>Distribution<()> <span class="kw">for </span>Standard { - <span class="attribute">#[allow(clippy::unused_unit)] - #[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&mut </span>R) -> () { - () - } -} -<span class="macro">tuple_impl! </span>{A} -<span class="macro">tuple_impl! </span>{A, B} -<span class="macro">tuple_impl! </span>{A, B, C} -<span class="macro">tuple_impl! </span>{A, B, C, D} -<span class="macro">tuple_impl! </span>{A, B, C, D, E} -<span class="macro">tuple_impl! </span>{A, B, C, D, E, F} -<span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G} -<span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G, H} -<span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G, H, I} -<span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G, H, I, J} -<span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G, H, I, J, K} -<span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G, H, I, J, K, L} - -<span class="attribute">#[cfg(feature = <span class="string">"min_const_gen"</span>)] -#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"min_const_gen"</span>)))] -</span><span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Distribution<[T; N]> <span class="kw">for </span>Standard -<span class="kw">where </span>Standard: Distribution<T> -{ - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, _rng: <span class="kw-2">&mut </span>R) -> [T; N] { - <span class="kw">let </span><span class="kw-2">mut </span>buff: [MaybeUninit<T>; N] = <span class="kw">unsafe </span>{ MaybeUninit::uninit().assume_init() }; - - <span class="kw">for </span>elem <span class="kw">in </span><span class="kw-2">&mut </span>buff { - <span class="kw-2">*</span>elem = MaybeUninit::new(_rng.gen()); - } - - <span class="kw">unsafe </span>{ mem::transmute_copy::<<span class="kw">_</span>, <span class="kw">_</span>>(<span class="kw-2">&</span>buff) } - } -} - -<span class="attribute">#[cfg(not(feature = <span class="string">"min_const_gen"</span>))] -</span><span class="macro">macro_rules! </span>array_impl { - <span class="comment">// recursive, given at least one type parameter: - </span>{<span class="macro-nonterminal">$n</span>:expr, <span class="macro-nonterminal">$t</span>:ident, $(<span class="macro-nonterminal">$ts</span>:ident,)<span class="kw-2">*</span>} => { - <span class="macro">array_impl!</span>{(<span class="macro-nonterminal">$n </span>- <span class="number">1</span>), $(<span class="macro-nonterminal">$ts</span>,)<span class="kw-2">*</span>} - - <span class="kw">impl</span><T> Distribution<[T; <span class="macro-nonterminal">$n</span>]> <span class="kw">for </span>Standard <span class="kw">where </span>Standard: Distribution<T> { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, _rng: <span class="kw-2">&mut </span>R) -> [T; <span class="macro-nonterminal">$n</span>] { - [_rng.gen::<<span class="macro-nonterminal">$t</span>>(), $(_rng.gen::<<span class="macro-nonterminal">$ts</span>>()),<span class="kw-2">*</span>] - } - } - }; - <span class="comment">// empty case: - </span>{<span class="macro-nonterminal">$n</span>:expr,} => { - <span class="kw">impl</span><T> Distribution<[T; <span class="macro-nonterminal">$n</span>]> <span class="kw">for </span>Standard { - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, _rng: <span class="kw-2">&mut </span>R) -> [T; <span class="macro-nonterminal">$n</span>] { [] } - } - }; -} - -<span class="attribute">#[cfg(not(feature = <span class="string">"min_const_gen"</span>))] -</span><span class="macro">array_impl! </span>{<span class="number">32</span>, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T,} - -<span class="kw">impl</span><T> Distribution<<span class="prelude-ty">Option</span><T>> <span class="kw">for </span>Standard -<span class="kw">where </span>Standard: Distribution<T> -{ - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="prelude-ty">Option</span><T> { - <span class="comment">// UFCS is needed here: https://github.com/rust-lang/rust/issues/24066 - </span><span class="kw">if </span>rng.gen::<bool>() { - <span class="prelude-val">Some</span>(rng.gen()) - } <span class="kw">else </span>{ - <span class="prelude-val">None - </span>} - } -} - -<span class="kw">impl</span><T> Distribution<Wrapping<T>> <span class="kw">for </span>Standard -<span class="kw">where </span>Standard: Distribution<T> -{ - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> Wrapping<T> { - Wrapping(rng.gen()) - } -} - - -<span class="attribute">#[cfg(test)] -</span><span class="kw">mod </span>tests { - <span class="kw">use super</span>::<span class="kw-2">*</span>; - <span class="kw">use </span><span class="kw">crate</span>::RngCore; - <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] </span><span class="kw">use </span>alloc::string::String; - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_misc() { - <span class="kw">let </span>rng: <span class="kw-2">&mut </span><span class="kw">dyn </span>RngCore = <span class="kw-2">&mut </span><span class="kw">crate</span>::test::rng(<span class="number">820</span>); - - rng.sample::<char, <span class="kw">_</span>>(Standard); - rng.sample::<bool, <span class="kw">_</span>>(Standard); - } - - <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] - #[test] - </span><span class="kw">fn </span>test_chars() { - <span class="kw">use </span>core::iter; - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">805</span>); - - <span class="comment">// Test by generating a relatively large number of chars, so we also - // take the rejection sampling path. - </span><span class="kw">let </span>word: String = iter::repeat(()) - .map(|()| rng.gen::<char>()) - .take(<span class="number">1000</span>) - .collect(); - <span class="macro">assert!</span>(!word.is_empty()); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_alphanumeric() { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">806</span>); - - <span class="comment">// Test by generating a relatively large number of chars, so we also - // take the rejection sampling path. - </span><span class="kw">let </span><span class="kw-2">mut </span>incorrect = <span class="bool-val">false</span>; - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">100 </span>{ - <span class="kw">let </span>c: char = rng.sample(Alphanumeric).into(); - incorrect |= !((<span class="string">'0'</span>..=<span class="string">'9'</span>).contains(<span class="kw-2">&</span>c) || - (<span class="string">'A'</span>..=<span class="string">'Z'</span>).contains(<span class="kw-2">&</span>c) || - (<span class="string">'a'</span>..=<span class="string">'z'</span>).contains(<span class="kw-2">&</span>c) ); - } - <span class="macro">assert!</span>(!incorrect); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>value_stability() { - <span class="kw">fn </span>test_samples<T: Copy + core::fmt::Debug + PartialEq, D: Distribution<T>>( - distr: <span class="kw-2">&</span>D, zero: T, expected: <span class="kw-2">&</span>[T], - ) { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">807</span>); - <span class="kw">let </span><span class="kw-2">mut </span>buf = [zero; <span class="number">5</span>]; - <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&mut </span>buf { - <span class="kw-2">*</span>x = rng.sample(<span class="kw-2">&</span>distr); - } - <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf, expected); - } - - test_samples(<span class="kw-2">&</span>Standard, <span class="string">'a'</span>, <span class="kw-2">&</span>[ - <span class="string">'\u{8cdac}'</span>, - <span class="string">'\u{a346a}'</span>, - <span class="string">'\u{80120}'</span>, - <span class="string">'\u{ed692}'</span>, - <span class="string">'\u{35888}'</span>, - ]); - test_samples(<span class="kw-2">&</span>Alphanumeric, <span class="number">0</span>, <span class="kw-2">&</span>[<span class="number">104</span>, <span class="number">109</span>, <span class="number">101</span>, <span class="number">51</span>, <span class="number">77</span>]); - test_samples(<span class="kw-2">&</span>Standard, <span class="bool-val">false</span>, <span class="kw-2">&</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>]); - test_samples(<span class="kw-2">&</span>Standard, <span class="prelude-val">None </span><span class="kw">as </span><span class="prelude-ty">Option</span><bool>, <span class="kw-2">&</span>[ - <span class="prelude-val">Some</span>(<span class="bool-val">true</span>), - <span class="prelude-val">None</span>, - <span class="prelude-val">Some</span>(<span class="bool-val">false</span>), - <span class="prelude-val">None</span>, - <span class="prelude-val">Some</span>(<span class="bool-val">false</span>), - ]); - test_samples(<span class="kw-2">&</span>Standard, Wrapping(<span class="number">0i32</span>), <span class="kw-2">&</span>[ - Wrapping(-<span class="number">2074640887</span>), - Wrapping(-<span class="number">1719949321</span>), - Wrapping(<span class="number">2018088303</span>), - Wrapping(-<span class="number">547181756</span>), - Wrapping(<span class="number">838957336</span>), - ]); - - <span class="comment">// We test only sub-sets of tuple and array impls - </span>test_samples(<span class="kw-2">&</span>Standard, (), <span class="kw-2">&</span>[(), (), (), (), ()]); - test_samples(<span class="kw-2">&</span>Standard, (<span class="bool-val">false</span>,), <span class="kw-2">&</span>[ - (<span class="bool-val">true</span>,), - (<span class="bool-val">true</span>,), - (<span class="bool-val">false</span>,), - (<span class="bool-val">true</span>,), - (<span class="bool-val">false</span>,), - ]); - test_samples(<span class="kw-2">&</span>Standard, (<span class="bool-val">false</span>, <span class="bool-val">false</span>), <span class="kw-2">&</span>[ - (<span class="bool-val">true</span>, <span class="bool-val">true</span>), - (<span class="bool-val">false</span>, <span class="bool-val">true</span>), - (<span class="bool-val">false</span>, <span class="bool-val">false</span>), - (<span class="bool-val">true</span>, <span class="bool-val">false</span>), - (<span class="bool-val">false</span>, <span class="bool-val">false</span>), - ]); - - test_samples(<span class="kw-2">&</span>Standard, [<span class="number">0u8</span>; <span class="number">0</span>], <span class="kw-2">&</span>[[], [], [], [], []]); - test_samples(<span class="kw-2">&</span>Standard, [<span class="number">0u8</span>; <span class="number">3</span>], <span class="kw-2">&</span>[ - [<span class="number">9</span>, <span class="number">247</span>, <span class="number">111</span>], - [<span class="number">68</span>, <span class="number">24</span>, <span class="number">13</span>], - [<span class="number">174</span>, <span class="number">19</span>, <span class="number">194</span>], - [<span class="number">172</span>, <span class="number">69</span>, <span class="number">213</span>], - [<span class="number">149</span>, <span class="number">207</span>, <span class="number">29</span>], - ]); - } -} -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/slice.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/slice.rs.html deleted file mode 100644 index 2f43484..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/slice.rs.html +++ /dev/null @@ -1,237 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/slice.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>slice.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../rand/index.html"> - <img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> -<span id="2">2</span> -<span id="3">3</span> -<span id="4">4</span> -<span id="5">5</span> -<span id="6">6</span> -<span id="7">7</span> -<span id="8">8</span> -<span id="9">9</span> -<span id="10">10</span> -<span id="11">11</span> -<span id="12">12</span> -<span id="13">13</span> -<span id="14">14</span> -<span id="15">15</span> -<span id="16">16</span> -<span id="17">17</span> -<span id="18">18</span> -<span id="19">19</span> -<span id="20">20</span> -<span id="21">21</span> -<span id="22">22</span> -<span id="23">23</span> -<span id="24">24</span> -<span id="25">25</span> -<span id="26">26</span> -<span id="27">27</span> -<span id="28">28</span> -<span id="29">29</span> -<span id="30">30</span> -<span id="31">31</span> -<span id="32">32</span> -<span id="33">33</span> -<span id="34">34</span> -<span id="35">35</span> -<span id="36">36</span> -<span id="37">37</span> -<span id="38">38</span> -<span id="39">39</span> -<span id="40">40</span> -<span id="41">41</span> -<span id="42">42</span> -<span id="43">43</span> -<span id="44">44</span> -<span id="45">45</span> -<span id="46">46</span> -<span id="47">47</span> -<span id="48">48</span> -<span id="49">49</span> -<span id="50">50</span> -<span id="51">51</span> -<span id="52">52</span> -<span id="53">53</span> -<span id="54">54</span> -<span id="55">55</span> -<span id="56">56</span> -<span id="57">57</span> -<span id="58">58</span> -<span id="59">59</span> -<span id="60">60</span> -<span id="61">61</span> -<span id="62">62</span> -<span id="63">63</span> -<span id="64">64</span> -<span id="65">65</span> -<span id="66">66</span> -<span id="67">67</span> -<span id="68">68</span> -<span id="69">69</span> -<span id="70">70</span> -<span id="71">71</span> -<span id="72">72</span> -<span id="73">73</span> -<span id="74">74</span> -<span id="75">75</span> -<span id="76">76</span> -<span id="77">77</span> -<span id="78">78</span> -<span id="79">79</span> -<span id="80">80</span> -<span id="81">81</span> -<span id="82">82</span> -<span id="83">83</span> -<span id="84">84</span> -<span id="85">85</span> -<span id="86">86</span> -<span id="87">87</span> -<span id="88">88</span> -<span id="89">89</span> -<span id="90">90</span> -<span id="91">91</span> -<span id="92">92</span> -<span id="93">93</span> -<span id="94">94</span> -<span id="95">95</span> -<span id="96">96</span> -<span id="97">97</span> -<span id="98">98</span> -<span id="99">99</span> -<span id="100">100</span> -<span id="101">101</span> -<span id="102">102</span> -<span id="103">103</span> -<span id="104">104</span> -<span id="105">105</span> -<span id="106">106</span> -<span id="107">107</span> -<span id="108">108</span> -<span id="109">109</span> -<span id="110">110</span> -<span id="111">111</span> -<span id="112">112</span> -<span id="113">113</span> -<span id="114">114</span> -<span id="115">115</span> -<span id="116">116</span> -<span id="117">117</span> -</pre><pre class="rust"><code><span class="comment">// Copyright 2021 Developers of the Rand project. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="kw">use </span><span class="kw">crate</span>::distributions::{Distribution, Uniform}; - -<span class="doccomment">/// A distribution to sample items uniformly from a slice. -/// -/// [`Slice::new`] constructs a distribution referencing a slice and uniformly -/// samples references from the items in the slice. It may do extra work up -/// front to make sampling of multiple values faster; if only one sample from -/// the slice is required, [`SliceRandom::choose`] can be more efficient. -/// -/// Steps are taken to avoid bias which might be present in naive -/// implementations; for example `slice[rng.gen() % slice.len()]` samples from -/// the slice, but may be more likely to select numbers in the low range than -/// other values. -/// -/// This distribution samples with replacement; each sample is independent. -/// Sampling without replacement requires state to be retained, and therefore -/// cannot be handled by a distribution; you should instead consider methods -/// on [`SliceRandom`], such as [`SliceRandom::choose_multiple`]. -/// -/// # Example -/// -/// ``` -/// use rand::Rng; -/// use rand::distributions::Slice; -/// -/// let vowels = ['a', 'e', 'i', 'o', 'u']; -/// let vowels_dist = Slice::new(&vowels).unwrap(); -/// let rng = rand::thread_rng(); -/// -/// // build a string of 10 vowels -/// let vowel_string: String = rng -/// .sample_iter(&vowels_dist) -/// .take(10) -/// .collect(); -/// -/// println!("{}", vowel_string); -/// assert_eq!(vowel_string.len(), 10); -/// assert!(vowel_string.chars().all(|c| vowels.contains(&c))); -/// ``` -/// -/// For a single sample, [`SliceRandom::choose`][crate::seq::SliceRandom::choose] -/// may be preferred: -/// -/// ``` -/// use rand::seq::SliceRandom; -/// -/// let vowels = ['a', 'e', 'i', 'o', 'u']; -/// let mut rng = rand::thread_rng(); -/// -/// println!("{}", vowels.choose(&mut rng).unwrap()) -/// ``` -/// -/// [`SliceRandom`]: crate::seq::SliceRandom -/// [`SliceRandom::choose`]: crate::seq::SliceRandom::choose -/// [`SliceRandom::choose_multiple`]: crate::seq::SliceRandom::choose_multiple -</span><span class="attribute">#[derive(Debug, Clone, Copy)] -</span><span class="kw">pub struct </span>Slice<<span class="lifetime">'a</span>, T> { - slice: <span class="kw-2">&</span><span class="lifetime">'a </span>[T], - range: Uniform<usize>, -} - -<span class="kw">impl</span><<span class="lifetime">'a</span>, T> Slice<<span class="lifetime">'a</span>, T> { - <span class="doccomment">/// Create a new `Slice` instance which samples uniformly from the slice. - /// Returns `Err` if the slice is empty. - </span><span class="kw">pub fn </span>new(slice: <span class="kw-2">&</span><span class="lifetime">'a </span>[T]) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, EmptySlice> { - <span class="kw">match </span>slice.len() { - <span class="number">0 </span>=> <span class="prelude-val">Err</span>(EmptySlice), - len => <span class="prelude-val">Ok</span>(<span class="self">Self </span>{ - slice, - range: Uniform::new(<span class="number">0</span>, len), - }), - } - } -} - -<span class="kw">impl</span><<span class="lifetime">'a</span>, T> Distribution<<span class="kw-2">&</span><span class="lifetime">'a </span>T> <span class="kw">for </span>Slice<<span class="lifetime">'a</span>, T> { - <span class="kw">fn </span>sample<R: <span class="kw">crate</span>::Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="kw-2">&</span><span class="lifetime">'a </span>T { - <span class="kw">let </span>idx = <span class="self">self</span>.range.sample(rng); - - <span class="macro">debug_assert!</span>( - idx < <span class="self">self</span>.slice.len(), - <span class="string">"Uniform::new(0, {}) somehow returned {}"</span>, - <span class="self">self</span>.slice.len(), - idx - ); - - <span class="comment">// Safety: at construction time, it was ensured that the slice was - // non-empty, and that the `Uniform` range produces values in range - // for the slice - </span><span class="kw">unsafe </span>{ <span class="self">self</span>.slice.get_unchecked(idx) } - } -} - -<span class="doccomment">/// Error type indicating that a [`Slice`] distribution was improperly -/// constructed with an empty slice. -</span><span class="attribute">#[derive(Debug, Clone, Copy)] -</span><span class="kw">pub struct </span>EmptySlice; - -<span class="kw">impl </span>core::fmt::Display <span class="kw">for </span>EmptySlice { - <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter<<span class="lifetime">'_</span>>) -> core::fmt::Result { - <span class="macro">write!</span>( - f, - <span class="string">"Tried to create a `distributions::Slice` with an empty slice" - </span>) - } -} - -<span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] -</span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>EmptySlice {} -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/uniform.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/uniform.rs.html deleted file mode 100644 index 72d0ba1..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/uniform.rs.html +++ /dev/null @@ -1,3319 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/uniform.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>uniform.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../rand/index.html"> - <img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> -<span id="2">2</span> -<span id="3">3</span> -<span id="4">4</span> -<span id="5">5</span> -<span id="6">6</span> -<span id="7">7</span> -<span id="8">8</span> -<span id="9">9</span> -<span id="10">10</span> -<span id="11">11</span> -<span id="12">12</span> -<span id="13">13</span> -<span id="14">14</span> -<span id="15">15</span> -<span id="16">16</span> -<span id="17">17</span> -<span id="18">18</span> -<span id="19">19</span> -<span id="20">20</span> -<span id="21">21</span> -<span id="22">22</span> -<span id="23">23</span> -<span id="24">24</span> -<span id="25">25</span> -<span id="26">26</span> -<span id="27">27</span> -<span id="28">28</span> -<span id="29">29</span> -<span id="30">30</span> -<span id="31">31</span> -<span id="32">32</span> -<span id="33">33</span> -<span id="34">34</span> -<span 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This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! A distribution uniformly sampling numbers within a given range. -//! -//! [`Uniform`] is the standard distribution to sample uniformly from a range; -//! e.g. `Uniform::new_inclusive(1, 6)` can sample integers from 1 to 6, like a -//! standard die. [`Rng::gen_range`] supports any type supported by -//! [`Uniform`]. -//! -//! This distribution is provided with support for several primitive types -//! (all integer and floating-point types) as well as [`std::time::Duration`], -//! and supports extension to user-defined types via a type-specific *back-end* -//! implementation. -//! -//! The types [`UniformInt`], [`UniformFloat`] and [`UniformDuration`] are the -//! back-ends supporting sampling from primitive integer and floating-point -//! ranges as well as from [`std::time::Duration`]; these types do not normally -//! need to be used directly (unless implementing a derived back-end). -//! -//! # Example usage -//! -//! ``` -//! use rand::{Rng, thread_rng}; -//! use rand::distributions::Uniform; -//! -//! let mut rng = thread_rng(); -//! let side = Uniform::new(-10.0, 10.0); -//! -//! // sample between 1 and 10 points -//! for _ in 0..rng.gen_range(1..=10) { -//! // sample a point from the square with sides -10 - 10 in two dimensions -//! let (x, y) = (rng.sample(side), rng.sample(side)); -//! println!("Point: {}, {}", x, y); -//! } -//! ``` -//! -//! # Extending `Uniform` to support a custom type -//! -//! To extend [`Uniform`] to support your own types, write a back-end which -//! implements the [`UniformSampler`] trait, then implement the [`SampleUniform`] -//! helper trait to "register" your back-end. See the `MyF32` example below. -//! -//! At a minimum, the back-end needs to store any parameters needed for sampling -//! (e.g. the target range) and implement `new`, `new_inclusive` and `sample`. -//! Those methods should include an assert to check the range is valid (i.e. -//! `low < high`). The example below merely wraps another back-end. -//! -//! The `new`, `new_inclusive` and `sample_single` functions use arguments of -//! type SampleBorrow<X> in order to support passing in values by reference or -//! by value. In the implementation of these functions, you can choose to -//! simply use the reference returned by [`SampleBorrow::borrow`], or you can choose -//! to copy or clone the value, whatever is appropriate for your type. -//! -//! ``` -//! use rand::prelude::*; -//! use rand::distributions::uniform::{Uniform, SampleUniform, -//! UniformSampler, UniformFloat, SampleBorrow}; -//! -//! struct MyF32(f32); -//! -//! #[derive(Clone, Copy, Debug)] -//! struct UniformMyF32(UniformFloat<f32>); -//! -//! impl UniformSampler for UniformMyF32 { -//! type X = MyF32; -//! fn new<B1, B2>(low: B1, high: B2) -> Self -//! where B1: SampleBorrow<Self::X> + Sized, -//! B2: SampleBorrow<Self::X> + Sized -//! { -//! UniformMyF32(UniformFloat::<f32>::new(low.borrow().0, high.borrow().0)) -//! } -//! fn new_inclusive<B1, B2>(low: B1, high: B2) -> Self -//! where B1: SampleBorrow<Self::X> + Sized, -//! B2: SampleBorrow<Self::X> + Sized -//! { -//! UniformMyF32(UniformFloat::<f32>::new_inclusive( -//! low.borrow().0, -//! high.borrow().0, -//! )) -//! } -//! fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Self::X { -//! MyF32(self.0.sample(rng)) -//! } -//! } -//! -//! impl SampleUniform for MyF32 { -//! type Sampler = UniformMyF32; -//! } -//! -//! let (low, high) = (MyF32(17.0f32), MyF32(22.0f32)); -//! let uniform = Uniform::new(low, high); -//! let x = uniform.sample(&mut thread_rng()); -//! ``` -//! -//! [`SampleUniform`]: crate::distributions::uniform::SampleUniform -//! [`UniformSampler`]: crate::distributions::uniform::UniformSampler -//! [`UniformInt`]: crate::distributions::uniform::UniformInt -//! [`UniformFloat`]: crate::distributions::uniform::UniformFloat -//! [`UniformDuration`]: crate::distributions::uniform::UniformDuration -//! [`SampleBorrow::borrow`]: crate::distributions::uniform::SampleBorrow::borrow - -</span><span class="kw">use </span>core::time::Duration; -<span class="kw">use </span>core::ops::{Range, RangeInclusive}; - -<span class="kw">use </span><span class="kw">crate</span>::distributions::float::IntoFloat; -<span class="kw">use </span><span class="kw">crate</span>::distributions::utils::{BoolAsSIMD, FloatAsSIMD, FloatSIMDUtils, WideningMultiply}; -<span class="kw">use </span><span class="kw">crate</span>::distributions::Distribution; -<span class="kw">use crate</span>::{Rng, RngCore}; - -<span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] -#[allow(unused_imports)] </span><span class="comment">// rustc doesn't detect that this is actually used -</span><span class="kw">use </span><span class="kw">crate</span>::distributions::utils::Float; - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] </span><span class="kw">use </span>packed_simd::<span class="kw-2">*</span>; - -<span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] -</span><span class="kw">use </span>serde::{Serialize, Deserialize}; - -<span class="doccomment">/// Sample values uniformly between two bounds. -/// -/// [`Uniform::new`] and [`Uniform::new_inclusive`] construct a uniform -/// distribution sampling from the given range; these functions may do extra -/// work up front to make sampling of multiple values faster. If only one sample -/// from the range is required, [`Rng::gen_range`] can be more efficient. -/// -/// When sampling from a constant range, many calculations can happen at -/// compile-time and all methods should be fast; for floating-point ranges and -/// the full range of integer types this should have comparable performance to -/// the `Standard` distribution. -/// -/// Steps are taken to avoid bias which might be present in naive -/// implementations; for example `rng.gen::<u8>() % 170` samples from the range -/// `[0, 169]` but is twice as likely to select numbers less than 85 than other -/// values. Further, the implementations here give more weight to the high-bits -/// generated by the RNG than the low bits, since with some RNGs the low-bits -/// are of lower quality than the high bits. -/// -/// Implementations must sample in `[low, high)` range for -/// `Uniform::new(low, high)`, i.e., excluding `high`. In particular, care must -/// be taken to ensure that rounding never results values `< low` or `>= high`. -/// -/// # Example -/// -/// ``` -/// use rand::distributions::{Distribution, Uniform}; -/// -/// let between = Uniform::from(10..10000); -/// let mut rng = rand::thread_rng(); -/// let mut sum = 0; -/// for _ in 0..1000 { -/// sum += between.sample(&mut rng); -/// } -/// println!("{}", sum); -/// ``` -/// -/// For a single sample, [`Rng::gen_range`] may be preferred: -/// -/// ``` -/// use rand::Rng; -/// -/// let mut rng = rand::thread_rng(); -/// println!("{}", rng.gen_range(0..10)); -/// ``` -/// -/// [`new`]: Uniform::new -/// [`new_inclusive`]: Uniform::new_inclusive -/// [`Rng::gen_range`]: Rng::gen_range -</span><span class="attribute">#[derive(Clone, Copy, Debug, PartialEq)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -#[cfg_attr(feature = <span class="string">"serde1"</span>, serde(bound(serialize = <span class="string">"X::Sampler: Serialize"</span>)))] -#[cfg_attr(feature = <span class="string">"serde1"</span>, serde(bound(deserialize = <span class="string">"X::Sampler: Deserialize<'de>"</span>)))] -</span><span class="kw">pub struct </span>Uniform<X: SampleUniform>(X::Sampler); - -<span class="kw">impl</span><X: SampleUniform> Uniform<X> { - <span class="doccomment">/// Create a new `Uniform` instance which samples uniformly from the half - /// open range `[low, high)` (excluding `high`). Panics if `low >= high`. - </span><span class="kw">pub fn </span>new<B1, B2>(low: B1, high: B2) -> Uniform<X> - <span class="kw">where - </span>B1: SampleBorrow<X> + Sized, - B2: SampleBorrow<X> + Sized, - { - Uniform(X::Sampler::new(low, high)) - } - - <span class="doccomment">/// Create a new `Uniform` instance which samples uniformly from the closed - /// range `[low, high]` (inclusive). Panics if `low > high`. - </span><span class="kw">pub fn </span>new_inclusive<B1, B2>(low: B1, high: B2) -> Uniform<X> - <span class="kw">where - </span>B1: SampleBorrow<X> + Sized, - B2: SampleBorrow<X> + Sized, - { - Uniform(X::Sampler::new_inclusive(low, high)) - } -} - -<span class="kw">impl</span><X: SampleUniform> Distribution<X> <span class="kw">for </span>Uniform<X> { - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> X { - <span class="self">self</span>.<span class="number">0</span>.sample(rng) - } -} - -<span class="doccomment">/// Helper trait for creating objects using the correct implementation of -/// [`UniformSampler`] for the sampling type. -/// -/// See the [module documentation] on how to implement [`Uniform`] range -/// sampling for a custom type. -/// -/// [module documentation]: crate::distributions::uniform -</span><span class="kw">pub trait </span>SampleUniform: Sized { - <span class="doccomment">/// The `UniformSampler` implementation supporting type `X`. - </span><span class="kw">type </span>Sampler: UniformSampler<X = <span class="self">Self</span>>; -} - -<span class="doccomment">/// Helper trait handling actual uniform sampling. -/// -/// See the [module documentation] on how to implement [`Uniform`] range -/// sampling for a custom type. -/// -/// Implementation of [`sample_single`] is optional, and is only useful when -/// the implementation can be faster than `Self::new(low, high).sample(rng)`. -/// -/// [module documentation]: crate::distributions::uniform -/// [`sample_single`]: UniformSampler::sample_single -</span><span class="kw">pub trait </span>UniformSampler: Sized { - <span class="doccomment">/// The type sampled by this implementation. - </span><span class="kw">type </span>X; - - <span class="doccomment">/// Construct self, with inclusive lower bound and exclusive upper bound - /// `[low, high)`. - /// - /// Usually users should not call this directly but instead use - /// `Uniform::new`, which asserts that `low < high` before calling this. - </span><span class="kw">fn </span>new<B1, B2>(low: B1, high: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized; - - <span class="doccomment">/// Construct self, with inclusive bounds `[low, high]`. - /// - /// Usually users should not call this directly but instead use - /// `Uniform::new_inclusive`, which asserts that `low <= high` before - /// calling this. - </span><span class="kw">fn </span>new_inclusive<B1, B2>(low: B1, high: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized; - - <span class="doccomment">/// Sample a value. - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="self">Self</span>::X; - - <span class="doccomment">/// Sample a single value uniformly from a range with inclusive lower bound - /// and exclusive upper bound `[low, high)`. - /// - /// By default this is implemented using - /// `UniformSampler::new(low, high).sample(rng)`. However, for some types - /// more optimal implementations for single usage may be provided via this - /// method (which is the case for integers and floats). - /// Results may not be identical. - /// - /// Note that to use this method in a generic context, the type needs to be - /// retrieved via `SampleUniform::Sampler` as follows: - /// ``` - /// use rand::{thread_rng, distributions::uniform::{SampleUniform, UniformSampler}}; - /// # #[allow(unused)] - /// fn sample_from_range<T: SampleUniform>(lb: T, ub: T) -> T { - /// let mut rng = thread_rng(); - /// <T as SampleUniform>::Sampler::sample_single(lb, ub, &mut rng) - /// } - /// ``` - </span><span class="kw">fn </span>sample_single<R: Rng + <span class="question-mark">?</span>Sized, B1, B2>(low: B1, high: B2, rng: <span class="kw-2">&mut </span>R) -> <span class="self">Self</span>::X - <span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>uniform: <span class="self">Self </span>= UniformSampler::new(low, high); - uniform.sample(rng) - } - - <span class="doccomment">/// Sample a single value uniformly from a range with inclusive lower bound - /// and inclusive upper bound `[low, high]`. - /// - /// By default this is implemented using - /// `UniformSampler::new_inclusive(low, high).sample(rng)`. However, for - /// some types more optimal implementations for single usage may be provided - /// via this method. - /// Results may not be identical. - </span><span class="kw">fn </span>sample_single_inclusive<R: Rng + <span class="question-mark">?</span>Sized, B1, B2>(low: B1, high: B2, rng: <span class="kw-2">&mut </span>R) - -> <span class="self">Self</span>::X - <span class="kw">where </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized - { - <span class="kw">let </span>uniform: <span class="self">Self </span>= UniformSampler::new_inclusive(low, high); - uniform.sample(rng) - } -} - -<span class="kw">impl</span><X: SampleUniform> From<Range<X>> <span class="kw">for </span>Uniform<X> { - <span class="kw">fn </span>from(r: ::core::ops::Range<X>) -> Uniform<X> { - Uniform::new(r.start, r.end) - } -} - -<span class="kw">impl</span><X: SampleUniform> From<RangeInclusive<X>> <span class="kw">for </span>Uniform<X> { - <span class="kw">fn </span>from(r: ::core::ops::RangeInclusive<X>) -> Uniform<X> { - Uniform::new_inclusive(r.start(), r.end()) - } -} - - -<span class="doccomment">/// Helper trait similar to [`Borrow`] but implemented -/// only for SampleUniform and references to SampleUniform in -/// order to resolve ambiguity issues. -/// -/// [`Borrow`]: std::borrow::Borrow -</span><span class="kw">pub trait </span>SampleBorrow<Borrowed> { - <span class="doccomment">/// Immutably borrows from an owned value. See [`Borrow::borrow`] - /// - /// [`Borrow::borrow`]: std::borrow::Borrow::borrow - </span><span class="kw">fn </span>borrow(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Borrowed; -} -<span class="kw">impl</span><Borrowed> SampleBorrow<Borrowed> <span class="kw">for </span>Borrowed -<span class="kw">where </span>Borrowed: SampleUniform -{ - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>borrow(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Borrowed { - <span class="self">self - </span>} -} -<span class="kw">impl</span><<span class="lifetime">'a</span>, Borrowed> SampleBorrow<Borrowed> <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>Borrowed -<span class="kw">where </span>Borrowed: SampleUniform -{ - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>borrow(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Borrowed { - <span class="kw-2">*</span><span class="self">self - </span>} -} - -<span class="doccomment">/// Range that supports generating a single sample efficiently. -/// -/// Any type implementing this trait can be used to specify the sampled range -/// for `Rng::gen_range`. -</span><span class="kw">pub trait </span>SampleRange<T> { - <span class="doccomment">/// Generate a sample from the given range. - </span><span class="kw">fn </span>sample_single<R: RngCore + <span class="question-mark">?</span>Sized>(<span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> T; - - <span class="doccomment">/// Check whether the range is empty. - </span><span class="kw">fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool; -} - -<span class="kw">impl</span><T: SampleUniform + PartialOrd> SampleRange<T> <span class="kw">for </span>Range<T> { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample_single<R: RngCore + <span class="question-mark">?</span>Sized>(<span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> T { - T::Sampler::sample_single(<span class="self">self</span>.start, <span class="self">self</span>.end, rng) - } - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { - !(<span class="self">self</span>.start < <span class="self">self</span>.end) - } -} - -<span class="kw">impl</span><T: SampleUniform + PartialOrd> SampleRange<T> <span class="kw">for </span>RangeInclusive<T> { - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample_single<R: RngCore + <span class="question-mark">?</span>Sized>(<span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> T { - T::Sampler::sample_single_inclusive(<span class="self">self</span>.start(), <span class="self">self</span>.end(), rng) - } - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { - !(<span class="self">self</span>.start() <= <span class="self">self</span>.end()) - } -} - - -<span class="comment">//////////////////////////////////////////////////////////////////////////////// - -// What follows are all back-ends. - - -</span><span class="doccomment">/// The back-end implementing [`UniformSampler`] for integer types. -/// -/// Unless you are implementing [`UniformSampler`] for your own type, this type -/// should not be used directly, use [`Uniform`] instead. -/// -/// # Implementation notes -/// -/// For simplicity, we use the same generic struct `UniformInt<X>` for all -/// integer types `X`. This gives us only one field type, `X`; to store unsigned -/// values of this size, we take use the fact that these conversions are no-ops. -/// -/// For a closed range, the number of possible numbers we should generate is -/// `range = (high - low + 1)`. To avoid bias, we must ensure that the size of -/// our sample space, `zone`, is a multiple of `range`; other values must be -/// rejected (by replacing with a new random sample). -/// -/// As a special case, we use `range = 0` to represent the full range of the -/// result type (i.e. for `new_inclusive($ty::MIN, $ty::MAX)`). -/// -/// The optimum `zone` is the largest product of `range` which fits in our -/// (unsigned) target type. We calculate this by calculating how many numbers we -/// must reject: `reject = (MAX + 1) % range = (MAX - range + 1) % range`. Any (large) -/// product of `range` will suffice, thus in `sample_single` we multiply by a -/// power of 2 via bit-shifting (faster but may cause more rejections). -/// -/// The smallest integer PRNGs generate is `u32`. For 8- and 16-bit outputs we -/// use `u32` for our `zone` and samples (because it's not slower and because -/// it reduces the chance of having to reject a sample). In this case we cannot -/// store `zone` in the target type since it is too large, however we know -/// `ints_to_reject < range <= $unsigned::MAX`. -/// -/// An alternative to using a modulus is widening multiply: After a widening -/// multiply by `range`, the result is in the high word. Then comparing the low -/// word against `zone` makes sure our distribution is uniform. -</span><span class="attribute">#[derive(Clone, Copy, Debug, PartialEq)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -</span><span class="kw">pub struct </span>UniformInt<X> { - low: X, - range: X, - z: X, <span class="comment">// either ints_to_reject or zone depending on implementation -</span>} - -<span class="macro">macro_rules! </span>uniform_int_impl { - (<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$unsigned</span>:ident, <span class="macro-nonterminal">$u_large</span>:ident) => { - <span class="kw">impl </span>SampleUniform <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="kw">type </span>Sampler = UniformInt<<span class="macro-nonterminal">$ty</span>>; - } - - <span class="kw">impl </span>UniformSampler <span class="kw">for </span>UniformInt<<span class="macro-nonterminal">$ty</span>> { - <span class="comment">// We play free and fast with unsigned vs signed here - // (when $ty is signed), but that's fine, since the - // contract of this macro is for $ty and $unsigned to be - // "bit-equal", so casting between them is a no-op. - - </span><span class="kw">type </span>X = <span class="macro-nonterminal">$ty</span>; - - <span class="attribute">#[inline] </span><span class="comment">// if the range is constant, this helps LLVM to do the - // calculations at compile-time. - </span><span class="kw">fn </span>new<B1, B2>(low_b: B1, high_b: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">assert!</span>(low < high, <span class="string">"Uniform::new called with `low >= high`"</span>); - UniformSampler::new_inclusive(low, high - <span class="number">1</span>) - } - - <span class="attribute">#[inline] </span><span class="comment">// if the range is constant, this helps LLVM to do the - // calculations at compile-time. - </span><span class="kw">fn </span>new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">assert!</span>( - low <= high, - <span class="string">"Uniform::new_inclusive called with `low > high`" - </span>); - <span class="kw">let </span>unsigned_max = ::core::<span class="macro-nonterminal">$u_large::MAX</span>; - - <span class="kw">let </span>range = high.wrapping_sub(low).wrapping_add(<span class="number">1</span>) <span class="kw">as </span><span class="macro-nonterminal">$unsigned</span>; - <span class="kw">let </span>ints_to_reject = <span class="kw">if </span>range > <span class="number">0 </span>{ - <span class="kw">let </span>range = <span class="macro-nonterminal">$u_large::from</span>(range); - (unsigned_max - range + <span class="number">1</span>) % range - } <span class="kw">else </span>{ - <span class="number">0 - </span>}; - - UniformInt { - low, - <span class="comment">// These are really $unsigned values, but store as $ty: - </span>range: range <span class="kw">as </span><span class="macro-nonterminal">$ty</span>, - z: ints_to_reject <span class="kw">as </span><span class="macro-nonterminal">$unsigned </span><span class="kw">as </span><span class="macro-nonterminal">$ty</span>, - } - } - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="self">Self</span>::X { - <span class="kw">let </span>range = <span class="self">self</span>.range <span class="kw">as </span><span class="macro-nonterminal">$unsigned </span><span class="kw">as </span><span class="macro-nonterminal">$u_large</span>; - <span class="kw">if </span>range > <span class="number">0 </span>{ - <span class="kw">let </span>unsigned_max = ::core::<span class="macro-nonterminal">$u_large::MAX</span>; - <span class="kw">let </span>zone = unsigned_max - (<span class="self">self</span>.z <span class="kw">as </span><span class="macro-nonterminal">$unsigned </span><span class="kw">as </span><span class="macro-nonterminal">$u_large</span>); - <span class="kw">loop </span>{ - <span class="kw">let </span>v: <span class="macro-nonterminal">$u_large </span>= rng.gen(); - <span class="kw">let </span>(hi, lo) = v.wmul(range); - <span class="kw">if </span>lo <= zone { - <span class="kw">return </span><span class="self">self</span>.low.wrapping_add(hi <span class="kw">as </span><span class="macro-nonterminal">$ty</span>); - } - } - } <span class="kw">else </span>{ - <span class="comment">// Sample from the entire integer range. - </span>rng.gen() - } - } - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample_single<R: Rng + <span class="question-mark">?</span>Sized, B1, B2>(low_b: B1, high_b: B2, rng: <span class="kw-2">&mut </span>R) -> <span class="self">Self</span>::X - <span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">assert!</span>(low < high, <span class="string">"UniformSampler::sample_single: low >= high"</span>); - <span class="self">Self</span>::sample_single_inclusive(low, high - <span class="number">1</span>, rng) - } - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample_single_inclusive<R: Rng + <span class="question-mark">?</span>Sized, B1, B2>(low_b: B1, high_b: B2, rng: <span class="kw-2">&mut </span>R) -> <span class="self">Self</span>::X - <span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">assert!</span>(low <= high, <span class="string">"UniformSampler::sample_single_inclusive: low > high"</span>); - <span class="kw">let </span>range = high.wrapping_sub(low).wrapping_add(<span class="number">1</span>) <span class="kw">as </span><span class="macro-nonterminal">$unsigned </span><span class="kw">as </span><span class="macro-nonterminal">$u_large</span>; - <span class="comment">// If the above resulted in wrap-around to 0, the range is $ty::MIN..=$ty::MAX, - // and any integer will do. - </span><span class="kw">if </span>range == <span class="number">0 </span>{ - <span class="kw">return </span>rng.gen(); - } - - <span class="kw">let </span>zone = <span class="kw">if </span>::core::<span class="macro-nonterminal">$unsigned::MAX </span><= ::core::u16::MAX <span class="kw">as </span><span class="macro-nonterminal">$unsigned </span>{ - <span class="comment">// Using a modulus is faster than the approximation for - // i8 and i16. I suppose we trade the cost of one - // modulus for near-perfect branch prediction. - </span><span class="kw">let </span>unsigned_max: <span class="macro-nonterminal">$u_large </span>= ::core::<span class="macro-nonterminal">$u_large::MAX</span>; - <span class="kw">let </span>ints_to_reject = (unsigned_max - range + <span class="number">1</span>) % range; - unsigned_max - ints_to_reject - } <span class="kw">else </span>{ - <span class="comment">// conservative but fast approximation. `- 1` is necessary to allow the - // same comparison without bias. - </span>(range << range.leading_zeros()).wrapping_sub(<span class="number">1</span>) - }; - - <span class="kw">loop </span>{ - <span class="kw">let </span>v: <span class="macro-nonterminal">$u_large </span>= rng.gen(); - <span class="kw">let </span>(hi, lo) = v.wmul(range); - <span class="kw">if </span>lo <= zone { - <span class="kw">return </span>low.wrapping_add(hi <span class="kw">as </span><span class="macro-nonterminal">$ty</span>); - } - } - } - } - }; -} - -<span class="macro">uniform_int_impl! </span>{ i8, u8, u32 } -<span class="macro">uniform_int_impl! </span>{ i16, u16, u32 } -<span class="macro">uniform_int_impl! </span>{ i32, u32, u32 } -<span class="macro">uniform_int_impl! </span>{ i64, u64, u64 } -<span class="macro">uniform_int_impl! </span>{ i128, u128, u128 } -<span class="macro">uniform_int_impl! </span>{ isize, usize, usize } -<span class="macro">uniform_int_impl! </span>{ u8, u8, u32 } -<span class="macro">uniform_int_impl! </span>{ u16, u16, u32 } -<span class="macro">uniform_int_impl! </span>{ u32, u32, u32 } -<span class="macro">uniform_int_impl! </span>{ u64, u64, u64 } -<span class="macro">uniform_int_impl! </span>{ usize, usize, usize } -<span class="macro">uniform_int_impl! </span>{ u128, u128, u128 } - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">macro_rules! </span>uniform_simd_int_impl { - (<span class="macro-nonterminal">$ty</span>:ident, <span class="macro-nonterminal">$unsigned</span>:ident, <span class="macro-nonterminal">$u_scalar</span>:ident) => { - <span class="comment">// The "pick the largest zone that can fit in an `u32`" optimization - // is less useful here. Multiple lanes complicate things, we don't - // know the PRNG's minimal output size, and casting to a larger vector - // is generally a bad idea for SIMD performance. The user can still - // implement it manually. - - // TODO: look into `Uniform::<u32x4>::new(0u32, 100)` functionality - // perhaps `impl SampleUniform for $u_scalar`? - </span><span class="kw">impl </span>SampleUniform <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="kw">type </span>Sampler = UniformInt<<span class="macro-nonterminal">$ty</span>>; - } - - <span class="kw">impl </span>UniformSampler <span class="kw">for </span>UniformInt<<span class="macro-nonterminal">$ty</span>> { - <span class="kw">type </span>X = <span class="macro-nonterminal">$ty</span>; - - <span class="attribute">#[inline] </span><span class="comment">// if the range is constant, this helps LLVM to do the - // calculations at compile-time. - </span><span class="kw">fn </span>new<B1, B2>(low_b: B1, high_b: B2) -> <span class="self">Self - </span><span class="kw">where </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">assert!</span>(low.lt(high).all(), <span class="string">"Uniform::new called with `low >= high`"</span>); - UniformSampler::new_inclusive(low, high - <span class="number">1</span>) - } - - <span class="attribute">#[inline] </span><span class="comment">// if the range is constant, this helps LLVM to do the - // calculations at compile-time. - </span><span class="kw">fn </span>new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> <span class="self">Self - </span><span class="kw">where </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">assert!</span>(low.le(high).all(), - <span class="string">"Uniform::new_inclusive called with `low > high`"</span>); - <span class="kw">let </span>unsigned_max = ::core::<span class="macro-nonterminal">$u_scalar::MAX</span>; - - <span class="comment">// NOTE: these may need to be replaced with explicitly - // wrapping operations if `packed_simd` changes - </span><span class="kw">let </span>range: <span class="macro-nonterminal">$unsigned </span>= ((high - low) + <span class="number">1</span>).cast(); - <span class="comment">// `% 0` will panic at runtime. - </span><span class="kw">let </span>not_full_range = range.gt(<span class="macro-nonterminal">$unsigned::splat</span>(<span class="number">0</span>)); - <span class="comment">// replacing 0 with `unsigned_max` allows a faster `select` - // with bitwise OR - </span><span class="kw">let </span>modulo = not_full_range.select(range, <span class="macro-nonterminal">$unsigned::splat</span>(unsigned_max)); - <span class="comment">// wrapping addition - </span><span class="kw">let </span>ints_to_reject = (unsigned_max - range + <span class="number">1</span>) % modulo; - <span class="comment">// When `range` is 0, `lo` of `v.wmul(range)` will always be - // zero which means only one sample is needed. - </span><span class="kw">let </span>zone = unsigned_max - ints_to_reject; - - UniformInt { - low, - <span class="comment">// These are really $unsigned values, but store as $ty: - </span>range: range.cast(), - z: zone.cast(), - } - } - - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="self">Self</span>::X { - <span class="kw">let </span>range: <span class="macro-nonterminal">$unsigned </span>= <span class="self">self</span>.range.cast(); - <span class="kw">let </span>zone: <span class="macro-nonterminal">$unsigned </span>= <span class="self">self</span>.z.cast(); - - <span class="comment">// This might seem very slow, generating a whole new - // SIMD vector for every sample rejection. For most uses - // though, the chance of rejection is small and provides good - // general performance. With multiple lanes, that chance is - // multiplied. To mitigate this, we replace only the lanes of - // the vector which fail, iteratively reducing the chance of - // rejection. The replacement method does however add a little - // overhead. Benchmarking or calculating probabilities might - // reveal contexts where this replacement method is slower. - </span><span class="kw">let </span><span class="kw-2">mut </span>v: <span class="macro-nonterminal">$unsigned </span>= rng.gen(); - <span class="kw">loop </span>{ - <span class="kw">let </span>(hi, lo) = v.wmul(range); - <span class="kw">let </span>mask = lo.le(zone); - <span class="kw">if </span>mask.all() { - <span class="kw">let </span>hi: <span class="macro-nonterminal">$ty </span>= hi.cast(); - <span class="comment">// wrapping addition - </span><span class="kw">let </span>result = <span class="self">self</span>.low + hi; - <span class="comment">// `select` here compiles to a blend operation - // When `range.eq(0).none()` the compare and blend - // operations are avoided. - </span><span class="kw">let </span>v: <span class="macro-nonterminal">$ty </span>= v.cast(); - <span class="kw">return </span>range.gt(<span class="macro-nonterminal">$unsigned::splat</span>(<span class="number">0</span>)).select(result, v); - } - <span class="comment">// Replace only the failing lanes - </span>v = mask.select(v, rng.gen()); - } - } - } - }; - - <span class="comment">// bulk implementation - </span>($((<span class="macro-nonterminal">$unsigned</span>:ident, <span class="macro-nonterminal">$signed</span>:ident),)+ <span class="macro-nonterminal">$u_scalar</span>:ident) => { - $( - <span class="macro">uniform_simd_int_impl!</span>(<span class="macro-nonterminal">$unsigned</span>, <span class="macro-nonterminal">$unsigned</span>, <span class="macro-nonterminal">$u_scalar</span>); - <span class="macro">uniform_simd_int_impl!</span>(<span class="macro-nonterminal">$signed</span>, <span class="macro-nonterminal">$unsigned</span>, <span class="macro-nonterminal">$u_scalar</span>); - )+ - }; -} - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_simd_int_impl! </span>{ - (u64x2, i64x2), - (u64x4, i64x4), - (u64x8, i64x8), - u64 -} - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_simd_int_impl! </span>{ - (u32x2, i32x2), - (u32x4, i32x4), - (u32x8, i32x8), - (u32x16, i32x16), - u32 -} - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_simd_int_impl! </span>{ - (u16x2, i16x2), - (u16x4, i16x4), - (u16x8, i16x8), - (u16x16, i16x16), - (u16x32, i16x32), - u16 -} - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_simd_int_impl! </span>{ - (u8x2, i8x2), - (u8x4, i8x4), - (u8x8, i8x8), - (u8x16, i8x16), - (u8x32, i8x32), - (u8x64, i8x64), - u8 -} - -<span class="kw">impl </span>SampleUniform <span class="kw">for </span>char { - <span class="kw">type </span>Sampler = UniformChar; -} - -<span class="doccomment">/// The back-end implementing [`UniformSampler`] for `char`. -/// -/// Unless you are implementing [`UniformSampler`] for your own type, this type -/// should not be used directly, use [`Uniform`] instead. -/// -/// This differs from integer range sampling since the range `0xD800..=0xDFFF` -/// are used for surrogate pairs in UCS and UTF-16, and consequently are not -/// valid Unicode code points. We must therefore avoid sampling values in this -/// range. -</span><span class="attribute">#[derive(Clone, Copy, Debug)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -</span><span class="kw">pub struct </span>UniformChar { - sampler: UniformInt<u32>, -} - -<span class="doccomment">/// UTF-16 surrogate range start -</span><span class="kw">const </span>CHAR_SURROGATE_START: u32 = <span class="number">0xD800</span>; -<span class="doccomment">/// UTF-16 surrogate range size -</span><span class="kw">const </span>CHAR_SURROGATE_LEN: u32 = <span class="number">0xE000 </span>- CHAR_SURROGATE_START; - -<span class="doccomment">/// Convert `char` to compressed `u32` -</span><span class="kw">fn </span>char_to_comp_u32(c: char) -> u32 { - <span class="kw">match </span>c <span class="kw">as </span>u32 { - c <span class="kw">if </span>c >= CHAR_SURROGATE_START => c - CHAR_SURROGATE_LEN, - c => c, - } -} - -<span class="kw">impl </span>UniformSampler <span class="kw">for </span>UniformChar { - <span class="kw">type </span>X = char; - - <span class="attribute">#[inline] </span><span class="comment">// if the range is constant, this helps LLVM to do the - // calculations at compile-time. - </span><span class="kw">fn </span>new<B1, B2>(low_b: B1, high_b: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = char_to_comp_u32(<span class="kw-2">*</span>low_b.borrow()); - <span class="kw">let </span>high = char_to_comp_u32(<span class="kw-2">*</span>high_b.borrow()); - <span class="kw">let </span>sampler = UniformInt::<u32>::new(low, high); - UniformChar { sampler } - } - - <span class="attribute">#[inline] </span><span class="comment">// if the range is constant, this helps LLVM to do the - // calculations at compile-time. - </span><span class="kw">fn </span>new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = char_to_comp_u32(<span class="kw-2">*</span>low_b.borrow()); - <span class="kw">let </span>high = char_to_comp_u32(<span class="kw-2">*</span>high_b.borrow()); - <span class="kw">let </span>sampler = UniformInt::<u32>::new_inclusive(low, high); - UniformChar { sampler } - } - - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="self">Self</span>::X { - <span class="kw">let </span><span class="kw-2">mut </span>x = <span class="self">self</span>.sampler.sample(rng); - <span class="kw">if </span>x >= CHAR_SURROGATE_START { - x += CHAR_SURROGATE_LEN; - } - <span class="comment">// SAFETY: x must not be in surrogate range or greater than char::MAX. - // This relies on range constructors which accept char arguments. - // Validity of input char values is assumed. - </span><span class="kw">unsafe </span>{ core::char::from_u32_unchecked(x) } - } -} - -<span class="doccomment">/// The back-end implementing [`UniformSampler`] for floating-point types. -/// -/// Unless you are implementing [`UniformSampler`] for your own type, this type -/// should not be used directly, use [`Uniform`] instead. -/// -/// # Implementation notes -/// -/// Instead of generating a float in the `[0, 1)` range using [`Standard`], the -/// `UniformFloat` implementation converts the output of an PRNG itself. This -/// way one or two steps can be optimized out. -/// -/// The floats are first converted to a value in the `[1, 2)` interval using a -/// transmute-based method, and then mapped to the expected range with a -/// multiply and addition. Values produced this way have what equals 23 bits of -/// random digits for an `f32`, and 52 for an `f64`. -/// -/// [`new`]: UniformSampler::new -/// [`new_inclusive`]: UniformSampler::new_inclusive -/// [`Standard`]: crate::distributions::Standard -</span><span class="attribute">#[derive(Clone, Copy, Debug, PartialEq)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -</span><span class="kw">pub struct </span>UniformFloat<X> { - low: X, - scale: X, -} - -<span class="macro">macro_rules! </span>uniform_float_impl { - (<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$uty</span>:ident, <span class="macro-nonterminal">$f_scalar</span>:ident, <span class="macro-nonterminal">$u_scalar</span>:ident, <span class="macro-nonterminal">$bits_to_discard</span>:expr) => { - <span class="kw">impl </span>SampleUniform <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="kw">type </span>Sampler = UniformFloat<<span class="macro-nonterminal">$ty</span>>; - } - - <span class="kw">impl </span>UniformSampler <span class="kw">for </span>UniformFloat<<span class="macro-nonterminal">$ty</span>> { - <span class="kw">type </span>X = <span class="macro-nonterminal">$ty</span>; - - <span class="kw">fn </span>new<B1, B2>(low_b: B1, high_b: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">debug_assert!</span>( - low.all_finite(), - <span class="string">"Uniform::new called with `low` non-finite." - </span>); - <span class="macro">debug_assert!</span>( - high.all_finite(), - <span class="string">"Uniform::new called with `high` non-finite." - </span>); - <span class="macro">assert!</span>(low.all_lt(high), <span class="string">"Uniform::new called with `low >= high`"</span>); - <span class="kw">let </span>max_rand = <<span class="macro-nonterminal">$ty</span>>::splat( - (::core::<span class="macro-nonterminal">$u_scalar::MAX </span>>> <span class="macro-nonterminal">$bits_to_discard</span>).into_float_with_exponent(<span class="number">0</span>) - <span class="number">1.0</span>, - ); - - <span class="kw">let </span><span class="kw-2">mut </span>scale = high - low; - <span class="macro">assert!</span>(scale.all_finite(), <span class="string">"Uniform::new: range overflow"</span>); - - <span class="kw">loop </span>{ - <span class="kw">let </span>mask = (scale * max_rand + low).ge_mask(high); - <span class="kw">if </span>mask.none() { - <span class="kw">break</span>; - } - scale = scale.decrease_masked(mask); - } - - <span class="macro">debug_assert!</span>(<<span class="macro-nonterminal">$ty</span>>::splat(<span class="number">0.0</span>).all_le(scale)); - - UniformFloat { low, scale } - } - - <span class="kw">fn </span>new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">debug_assert!</span>( - low.all_finite(), - <span class="string">"Uniform::new_inclusive called with `low` non-finite." - </span>); - <span class="macro">debug_assert!</span>( - high.all_finite(), - <span class="string">"Uniform::new_inclusive called with `high` non-finite." - </span>); - <span class="macro">assert!</span>( - low.all_le(high), - <span class="string">"Uniform::new_inclusive called with `low > high`" - </span>); - <span class="kw">let </span>max_rand = <<span class="macro-nonterminal">$ty</span>>::splat( - (::core::<span class="macro-nonterminal">$u_scalar::MAX </span>>> <span class="macro-nonterminal">$bits_to_discard</span>).into_float_with_exponent(<span class="number">0</span>) - <span class="number">1.0</span>, - ); - - <span class="kw">let </span><span class="kw-2">mut </span>scale = (high - low) / max_rand; - <span class="macro">assert!</span>(scale.all_finite(), <span class="string">"Uniform::new_inclusive: range overflow"</span>); - - <span class="kw">loop </span>{ - <span class="kw">let </span>mask = (scale * max_rand + low).gt_mask(high); - <span class="kw">if </span>mask.none() { - <span class="kw">break</span>; - } - scale = scale.decrease_masked(mask); - } - - <span class="macro">debug_assert!</span>(<<span class="macro-nonterminal">$ty</span>>::splat(<span class="number">0.0</span>).all_le(scale)); - - UniformFloat { low, scale } - } - - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="self">Self</span>::X { - <span class="comment">// Generate a value in the range [1, 2) - </span><span class="kw">let </span>value1_2 = (rng.gen::<<span class="macro-nonterminal">$uty</span>>() >> <span class="macro-nonterminal">$bits_to_discard</span>).into_float_with_exponent(<span class="number">0</span>); - - <span class="comment">// Get a value in the range [0, 1) in order to avoid - // overflowing into infinity when multiplying with scale - </span><span class="kw">let </span>value0_1 = value1_2 - <span class="number">1.0</span>; - - <span class="comment">// We don't use `f64::mul_add`, because it is not available with - // `no_std`. Furthermore, it is slower for some targets (but - // faster for others). However, the order of multiplication and - // addition is important, because on some platforms (e.g. ARM) - // it will be optimized to a single (non-FMA) instruction. - </span>value0_1 * <span class="self">self</span>.scale + <span class="self">self</span>.low - } - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample_single<R: Rng + <span class="question-mark">?</span>Sized, B1, B2>(low_b: B1, high_b: B2, rng: <span class="kw-2">&mut </span>R) -> <span class="self">Self</span>::X - <span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">debug_assert!</span>( - low.all_finite(), - <span class="string">"UniformSampler::sample_single called with `low` non-finite." - </span>); - <span class="macro">debug_assert!</span>( - high.all_finite(), - <span class="string">"UniformSampler::sample_single called with `high` non-finite." - </span>); - <span class="macro">assert!</span>( - low.all_lt(high), - <span class="string">"UniformSampler::sample_single: low >= high" - </span>); - <span class="kw">let </span><span class="kw-2">mut </span>scale = high - low; - <span class="macro">assert!</span>(scale.all_finite(), <span class="string">"UniformSampler::sample_single: range overflow"</span>); - - <span class="kw">loop </span>{ - <span class="comment">// Generate a value in the range [1, 2) - </span><span class="kw">let </span>value1_2 = - (rng.gen::<<span class="macro-nonterminal">$uty</span>>() >> <span class="macro-nonterminal">$bits_to_discard</span>).into_float_with_exponent(<span class="number">0</span>); - - <span class="comment">// Get a value in the range [0, 1) in order to avoid - // overflowing into infinity when multiplying with scale - </span><span class="kw">let </span>value0_1 = value1_2 - <span class="number">1.0</span>; - - <span class="comment">// Doing multiply before addition allows some architectures - // to use a single instruction. - </span><span class="kw">let </span>res = value0_1 * scale + low; - - <span class="macro">debug_assert!</span>(low.all_le(res) || !scale.all_finite()); - <span class="kw">if </span>res.all_lt(high) { - <span class="kw">return </span>res; - } - - <span class="comment">// This handles a number of edge cases. - // * `low` or `high` is NaN. In this case `scale` and - // `res` are going to end up as NaN. - // * `low` is negative infinity and `high` is finite. - // `scale` is going to be infinite and `res` will be - // NaN. - // * `high` is positive infinity and `low` is finite. - // `scale` is going to be infinite and `res` will - // be infinite or NaN (if value0_1 is 0). - // * `low` is negative infinity and `high` is positive - // infinity. `scale` will be infinite and `res` will - // be NaN. - // * `low` and `high` are finite, but `high - low` - // overflows to infinite. `scale` will be infinite - // and `res` will be infinite or NaN (if value0_1 is 0). - // So if `high` or `low` are non-finite, we are guaranteed - // to fail the `res < high` check above and end up here. - // - // While we technically should check for non-finite `low` - // and `high` before entering the loop, by doing the checks - // here instead, we allow the common case to avoid these - // checks. But we are still guaranteed that if `low` or - // `high` are non-finite we'll end up here and can do the - // appropriate checks. - // - // Likewise `high - low` overflowing to infinity is also - // rare, so handle it here after the common case. - </span><span class="kw">let </span>mask = !scale.finite_mask(); - <span class="kw">if </span>mask.any() { - <span class="macro">assert!</span>( - low.all_finite() && high.all_finite(), - <span class="string">"Uniform::sample_single: low and high must be finite" - </span>); - scale = scale.decrease_masked(mask); - } - } - } - } - }; -} - -<span class="macro">uniform_float_impl! </span>{ f32, u32, f32, u32, <span class="number">32 </span>- <span class="number">23 </span>} -<span class="macro">uniform_float_impl! </span>{ f64, u64, f64, u64, <span class="number">64 </span>- <span class="number">52 </span>} - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_float_impl! </span>{ f32x2, u32x2, f32, u32, <span class="number">32 </span>- <span class="number">23 </span>} -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_float_impl! </span>{ f32x4, u32x4, f32, u32, <span class="number">32 </span>- <span class="number">23 </span>} -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_float_impl! </span>{ f32x8, u32x8, f32, u32, <span class="number">32 </span>- <span class="number">23 </span>} -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_float_impl! </span>{ f32x16, u32x16, f32, u32, <span class="number">32 </span>- <span class="number">23 </span>} - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_float_impl! </span>{ f64x2, u64x2, f64, u64, <span class="number">64 </span>- <span class="number">52 </span>} -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_float_impl! </span>{ f64x4, u64x4, f64, u64, <span class="number">64 </span>- <span class="number">52 </span>} -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">uniform_float_impl! </span>{ f64x8, u64x8, f64, u64, <span class="number">64 </span>- <span class="number">52 </span>} - - -<span class="doccomment">/// The back-end implementing [`UniformSampler`] for `Duration`. -/// -/// Unless you are implementing [`UniformSampler`] for your own types, this type -/// should not be used directly, use [`Uniform`] instead. -</span><span class="attribute">#[derive(Clone, Copy, Debug)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -</span><span class="kw">pub struct </span>UniformDuration { - mode: UniformDurationMode, - offset: u32, -} - -<span class="attribute">#[derive(Debug, Copy, Clone)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -</span><span class="kw">enum </span>UniformDurationMode { - Small { - secs: u64, - nanos: Uniform<u32>, - }, - Medium { - nanos: Uniform<u64>, - }, - Large { - max_secs: u64, - max_nanos: u32, - secs: Uniform<u64>, - }, -} - -<span class="kw">impl </span>SampleUniform <span class="kw">for </span>Duration { - <span class="kw">type </span>Sampler = UniformDuration; -} - -<span class="kw">impl </span>UniformSampler <span class="kw">for </span>UniformDuration { - <span class="kw">type </span>X = Duration; - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>new<B1, B2>(low_b: B1, high_b: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">assert!</span>(low < high, <span class="string">"Uniform::new called with `low >= high`"</span>); - UniformDuration::new_inclusive(low, high - Duration::new(<span class="number">0</span>, <span class="number">1</span>)) - } - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - <span class="kw">let </span>low = <span class="kw-2">*</span>low_b.borrow(); - <span class="kw">let </span>high = <span class="kw-2">*</span>high_b.borrow(); - <span class="macro">assert!</span>( - low <= high, - <span class="string">"Uniform::new_inclusive called with `low > high`" - </span>); - - <span class="kw">let </span>low_s = low.as_secs(); - <span class="kw">let </span>low_n = low.subsec_nanos(); - <span class="kw">let </span><span class="kw-2">mut </span>high_s = high.as_secs(); - <span class="kw">let </span><span class="kw-2">mut </span>high_n = high.subsec_nanos(); - - <span class="kw">if </span>high_n < low_n { - high_s -= <span class="number">1</span>; - high_n += <span class="number">1_000_000_000</span>; - } - - <span class="kw">let </span>mode = <span class="kw">if </span>low_s == high_s { - UniformDurationMode::Small { - secs: low_s, - nanos: Uniform::new_inclusive(low_n, high_n), - } - } <span class="kw">else </span>{ - <span class="kw">let </span>max = high_s - .checked_mul(<span class="number">1_000_000_000</span>) - .and_then(|n| n.checked_add(u64::from(high_n))); - - <span class="kw">if let </span><span class="prelude-val">Some</span>(higher_bound) = max { - <span class="kw">let </span>lower_bound = low_s * <span class="number">1_000_000_000 </span>+ u64::from(low_n); - UniformDurationMode::Medium { - nanos: Uniform::new_inclusive(lower_bound, higher_bound), - } - } <span class="kw">else </span>{ - <span class="comment">// An offset is applied to simplify generation of nanoseconds - </span><span class="kw">let </span>max_nanos = high_n - low_n; - UniformDurationMode::Large { - max_secs: high_s, - max_nanos, - secs: Uniform::new_inclusive(low_s, high_s), - } - } - }; - UniformDuration { - mode, - offset: low_n, - } - } - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> Duration { - <span class="kw">match </span><span class="self">self</span>.mode { - UniformDurationMode::Small { secs, nanos } => { - <span class="kw">let </span>n = nanos.sample(rng); - Duration::new(secs, n) - } - UniformDurationMode::Medium { nanos } => { - <span class="kw">let </span>nanos = nanos.sample(rng); - Duration::new(nanos / <span class="number">1_000_000_000</span>, (nanos % <span class="number">1_000_000_000</span>) <span class="kw">as </span>u32) - } - UniformDurationMode::Large { - max_secs, - max_nanos, - secs, - } => { - <span class="comment">// constant folding means this is at least as fast as `Rng::sample(Range)` - </span><span class="kw">let </span>nano_range = Uniform::new(<span class="number">0</span>, <span class="number">1_000_000_000</span>); - <span class="kw">loop </span>{ - <span class="kw">let </span>s = secs.sample(rng); - <span class="kw">let </span>n = nano_range.sample(rng); - <span class="kw">if </span>!(s == max_secs && n > max_nanos) { - <span class="kw">let </span>sum = n + <span class="self">self</span>.offset; - <span class="kw">break </span>Duration::new(s, sum); - } - } - } - } - } -} - -<span class="attribute">#[cfg(test)] -</span><span class="kw">mod </span>tests { - <span class="kw">use super</span>::<span class="kw-2">*</span>; - <span class="kw">use </span><span class="kw">crate</span>::rngs::mock::StepRng; - - <span class="attribute">#[test] - #[cfg(feature = <span class="string">"serde1"</span>)] - </span><span class="kw">fn </span>test_serialization_uniform_duration() { - <span class="kw">let </span>distr = UniformDuration::new(Duration::from_secs(<span class="number">10</span>), Duration::from_secs(<span class="number">60</span>)); - <span class="kw">let </span>de_distr: UniformDuration = bincode::deserialize(<span class="kw-2">&</span>bincode::serialize(<span class="kw-2">&</span>distr).unwrap()).unwrap(); - <span class="macro">assert_eq!</span>( - distr.offset, de_distr.offset - ); - <span class="kw">match </span>(distr.mode, de_distr.mode) { - (UniformDurationMode::Small {secs: a_secs, nanos: a_nanos}, UniformDurationMode::Small {secs, nanos}) => { - <span class="macro">assert_eq!</span>(a_secs, secs); - - <span class="macro">assert_eq!</span>(a_nanos.<span class="number">0</span>.low, nanos.<span class="number">0</span>.low); - <span class="macro">assert_eq!</span>(a_nanos.<span class="number">0</span>.range, nanos.<span class="number">0</span>.range); - <span class="macro">assert_eq!</span>(a_nanos.<span class="number">0</span>.z, nanos.<span class="number">0</span>.z); - } - (UniformDurationMode::Medium {nanos: a_nanos} , UniformDurationMode::Medium {nanos}) => { - <span class="macro">assert_eq!</span>(a_nanos.<span class="number">0</span>.low, nanos.<span class="number">0</span>.low); - <span class="macro">assert_eq!</span>(a_nanos.<span class="number">0</span>.range, nanos.<span class="number">0</span>.range); - <span class="macro">assert_eq!</span>(a_nanos.<span class="number">0</span>.z, nanos.<span class="number">0</span>.z); - } - (UniformDurationMode::Large {max_secs:a_max_secs, max_nanos:a_max_nanos, secs:a_secs}, UniformDurationMode::Large {max_secs, max_nanos, secs} ) => { - <span class="macro">assert_eq!</span>(a_max_secs, max_secs); - <span class="macro">assert_eq!</span>(a_max_nanos, max_nanos); - - <span class="macro">assert_eq!</span>(a_secs.<span class="number">0</span>.low, secs.<span class="number">0</span>.low); - <span class="macro">assert_eq!</span>(a_secs.<span class="number">0</span>.range, secs.<span class="number">0</span>.range); - <span class="macro">assert_eq!</span>(a_secs.<span class="number">0</span>.z, secs.<span class="number">0</span>.z); - } - <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"`UniformDurationMode` was not serialized/deserialized correctly"</span>) - } - } - - <span class="attribute">#[test] - #[cfg(feature = <span class="string">"serde1"</span>)] - </span><span class="kw">fn </span>test_uniform_serialization() { - <span class="kw">let </span>unit_box: Uniform<i32> = Uniform::new(-<span class="number">1</span>, <span class="number">1</span>); - <span class="kw">let </span>de_unit_box: Uniform<i32> = bincode::deserialize(<span class="kw-2">&</span>bincode::serialize(<span class="kw-2">&</span>unit_box).unwrap()).unwrap(); - - <span class="macro">assert_eq!</span>(unit_box.<span class="number">0</span>.low, de_unit_box.<span class="number">0</span>.low); - <span class="macro">assert_eq!</span>(unit_box.<span class="number">0</span>.range, de_unit_box.<span class="number">0</span>.range); - <span class="macro">assert_eq!</span>(unit_box.<span class="number">0</span>.z, de_unit_box.<span class="number">0</span>.z); - - <span class="kw">let </span>unit_box: Uniform<f32> = Uniform::new(-<span class="number">1.</span>, <span class="number">1.</span>); - <span class="kw">let </span>de_unit_box: Uniform<f32> = bincode::deserialize(<span class="kw-2">&</span>bincode::serialize(<span class="kw-2">&</span>unit_box).unwrap()).unwrap(); - - <span class="macro">assert_eq!</span>(unit_box.<span class="number">0</span>.low, de_unit_box.<span class="number">0</span>.low); - <span class="macro">assert_eq!</span>(unit_box.<span class="number">0</span>.scale, de_unit_box.<span class="number">0</span>.scale); - } - - <span class="attribute">#[should_panic] - #[test] - </span><span class="kw">fn </span>test_uniform_bad_limits_equal_int() { - Uniform::new(<span class="number">10</span>, <span class="number">10</span>); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_uniform_good_limits_equal_int() { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">804</span>); - <span class="kw">let </span>dist = Uniform::new_inclusive(<span class="number">10</span>, <span class="number">10</span>); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">20 </span>{ - <span class="macro">assert_eq!</span>(rng.sample(dist), <span class="number">10</span>); - } - } - - <span class="attribute">#[should_panic] - #[test] - </span><span class="kw">fn </span>test_uniform_bad_limits_flipped_int() { - Uniform::new(<span class="number">10</span>, <span class="number">5</span>); - } - - <span class="attribute">#[test] - #[cfg_attr(miri, ignore)] </span><span class="comment">// Miri is too slow - </span><span class="kw">fn </span>test_integers() { - <span class="kw">use </span>core::{i128, u128}; - <span class="kw">use </span>core::{i16, i32, i64, i8, isize}; - <span class="kw">use </span>core::{u16, u32, u64, u8, usize}; - - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">251</span>); - <span class="macro">macro_rules! </span>t { - (<span class="macro-nonterminal">$ty</span>:ident, <span class="macro-nonterminal">$v</span>:expr, <span class="macro-nonterminal">$le</span>:expr, <span class="macro-nonterminal">$lt</span>:expr) => {{ - <span class="kw">for </span><span class="kw-2">&</span>(low, high) <span class="kw">in </span><span class="macro-nonterminal">$v</span>.iter() { - <span class="kw">let </span>my_uniform = Uniform::new(low, high); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">1000 </span>{ - <span class="kw">let </span>v: <span class="macro-nonterminal">$ty </span>= rng.sample(my_uniform); - <span class="macro">assert!</span>(<span class="macro-nonterminal">$le</span>(low, v) && <span class="macro-nonterminal">$lt</span>(v, high)); - } - - <span class="kw">let </span>my_uniform = Uniform::new_inclusive(low, high); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">1000 </span>{ - <span class="kw">let </span>v: <span class="macro-nonterminal">$ty </span>= rng.sample(my_uniform); - <span class="macro">assert!</span>(<span class="macro-nonterminal">$le</span>(low, v) && <span class="macro-nonterminal">$le</span>(v, high)); - } - - <span class="kw">let </span>my_uniform = Uniform::new(<span class="kw-2">&</span>low, high); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">1000 </span>{ - <span class="kw">let </span>v: <span class="macro-nonterminal">$ty </span>= rng.sample(my_uniform); - <span class="macro">assert!</span>(<span class="macro-nonterminal">$le</span>(low, v) && <span class="macro-nonterminal">$lt</span>(v, high)); - } - - <span class="kw">let </span>my_uniform = Uniform::new_inclusive(<span class="kw-2">&</span>low, <span class="kw-2">&</span>high); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">1000 </span>{ - <span class="kw">let </span>v: <span class="macro-nonterminal">$ty </span>= rng.sample(my_uniform); - <span class="macro">assert!</span>(<span class="macro-nonterminal">$le</span>(low, v) && <span class="macro-nonterminal">$le</span>(v, high)); - } - - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">1000 </span>{ - <span class="kw">let </span>v = <<span class="macro-nonterminal">$ty </span><span class="kw">as </span>SampleUniform>::Sampler::sample_single(low, high, <span class="kw-2">&mut </span>rng); - <span class="macro">assert!</span>(<span class="macro-nonterminal">$le</span>(low, v) && <span class="macro-nonterminal">$lt</span>(v, high)); - } - - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">1000 </span>{ - <span class="kw">let </span>v = <<span class="macro-nonterminal">$ty </span><span class="kw">as </span>SampleUniform>::Sampler::sample_single_inclusive(low, high, <span class="kw-2">&mut </span>rng); - <span class="macro">assert!</span>(<span class="macro-nonterminal">$le</span>(low, v) && <span class="macro-nonterminal">$le</span>(v, high)); - } - } - }}; - - <span class="comment">// scalar bulk - </span>($(<span class="macro-nonterminal">$ty</span>:ident),<span class="kw-2">*</span>) => {{ - $(<span class="macro">t!</span>( - <span class="macro-nonterminal">$ty</span>, - [(<span class="number">0</span>, <span class="number">10</span>), (<span class="number">10</span>, <span class="number">127</span>), (<span class="macro-nonterminal">$ty::MIN</span>, <span class="macro-nonterminal">$ty::MAX</span>)], - |x, y| x <= y, - |x, y| x < y - );)* - }}; - - <span class="comment">// simd bulk - </span>($(<span class="macro-nonterminal">$ty</span>:ident),* => <span class="macro-nonterminal">$scalar</span>:ident) => {{ - $(<span class="macro">t!</span>( - <span class="macro-nonterminal">$ty</span>, - [ - (<span class="macro-nonterminal">$ty::splat</span>(<span class="number">0</span>), <span class="macro-nonterminal">$ty::splat</span>(<span class="number">10</span>)), - (<span class="macro-nonterminal">$ty::splat</span>(<span class="number">10</span>), <span class="macro-nonterminal">$ty::splat</span>(<span class="number">127</span>)), - (<span class="macro-nonterminal">$ty::splat</span>(<span class="macro-nonterminal">$scalar::MIN</span>), <span class="macro-nonterminal">$ty::splat</span>(<span class="macro-nonterminal">$scalar::MAX</span>)), - ], - |x: <span class="macro-nonterminal">$ty</span>, y| x.le(y).all(), - |x: <span class="macro-nonterminal">$ty</span>, y| x.lt(y).all() - );)* - }}; - } - <span class="macro">t!</span>(i8, i16, i32, i64, isize, u8, u16, u32, u64, usize, i128, u128); - - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span>{ - <span class="macro">t!</span>(u8x2, u8x4, u8x8, u8x16, u8x32, u8x64 => u8); - <span class="macro">t!</span>(i8x2, i8x4, i8x8, i8x16, i8x32, i8x64 => i8); - <span class="macro">t!</span>(u16x2, u16x4, u16x8, u16x16, u16x32 => u16); - <span class="macro">t!</span>(i16x2, i16x4, i16x8, i16x16, i16x32 => i16); - <span class="macro">t!</span>(u32x2, u32x4, u32x8, u32x16 => u32); - <span class="macro">t!</span>(i32x2, i32x4, i32x8, i32x16 => i32); - <span class="macro">t!</span>(u64x2, u64x4, u64x8 => u64); - <span class="macro">t!</span>(i64x2, i64x4, i64x8 => i64); - } - } - - <span class="attribute">#[test] - #[cfg_attr(miri, ignore)] </span><span class="comment">// Miri is too slow - </span><span class="kw">fn </span>test_char() { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">891</span>); - <span class="kw">let </span><span class="kw-2">mut </span>max = core::char::from_u32(<span class="number">0</span>).unwrap(); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">100 </span>{ - <span class="kw">let </span>c = rng.gen_range(<span class="string">'A'</span>..=<span class="string">'Z'</span>); - <span class="macro">assert!</span>((<span class="string">'A'</span>..=<span class="string">'Z'</span>).contains(<span class="kw-2">&</span>c)); - max = max.max(c); - } - <span class="macro">assert_eq!</span>(max, <span class="string">'Z'</span>); - <span class="kw">let </span>d = Uniform::new( - core::char::from_u32(<span class="number">0xD7F0</span>).unwrap(), - core::char::from_u32(<span class="number">0xE010</span>).unwrap(), - ); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">100 </span>{ - <span class="kw">let </span>c = d.sample(<span class="kw-2">&mut </span>rng); - <span class="macro">assert!</span>((c <span class="kw">as </span>u32) < <span class="number">0xD800 </span>|| (c <span class="kw">as </span>u32) > <span class="number">0xDFFF</span>); - } - } - - <span class="attribute">#[test] - #[cfg_attr(miri, ignore)] </span><span class="comment">// Miri is too slow - </span><span class="kw">fn </span>test_floats() { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">252</span>); - <span class="kw">let </span><span class="kw-2">mut </span>zero_rng = StepRng::new(<span class="number">0</span>, <span class="number">0</span>); - <span class="kw">let </span><span class="kw-2">mut </span>max_rng = StepRng::new(<span class="number">0xffff_ffff_ffff_ffff</span>, <span class="number">0</span>); - <span class="macro">macro_rules! </span>t { - (<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$f_scalar</span>:ident, <span class="macro-nonterminal">$bits_shifted</span>:expr) => {{ - <span class="kw">let </span>v: <span class="kw-2">&</span>[(<span class="macro-nonterminal">$f_scalar</span>, <span class="macro-nonterminal">$f_scalar</span>)] = <span class="kw-2">&</span>[ - (<span class="number">0.0</span>, <span class="number">100.0</span>), - (-<span class="number">1e35</span>, -<span class="number">1e25</span>), - (<span class="number">1e-35</span>, <span class="number">1e-25</span>), - (-<span class="number">1e35</span>, <span class="number">1e35</span>), - (<<span class="macro-nonterminal">$f_scalar</span>>::from_bits(<span class="number">0</span>), <<span class="macro-nonterminal">$f_scalar</span>>::from_bits(<span class="number">3</span>)), - (-<<span class="macro-nonterminal">$f_scalar</span>>::from_bits(<span class="number">10</span>), -<<span class="macro-nonterminal">$f_scalar</span>>::from_bits(<span class="number">1</span>)), - (-<<span class="macro-nonterminal">$f_scalar</span>>::from_bits(<span class="number">5</span>), <span class="number">0.0</span>), - (-<<span class="macro-nonterminal">$f_scalar</span>>::from_bits(<span class="number">7</span>), -<span class="number">0.0</span>), - (<span class="number">0.1 </span>* ::core::<span class="macro-nonterminal">$f_scalar::MAX</span>, ::core::<span class="macro-nonterminal">$f_scalar::MAX</span>), - (-::core::<span class="macro-nonterminal">$f_scalar::MAX </span>* <span class="number">0.2</span>, ::core::<span class="macro-nonterminal">$f_scalar::MAX </span>* <span class="number">0.7</span>), - ]; - <span class="kw">for </span><span class="kw-2">&</span>(low_scalar, high_scalar) <span class="kw">in </span>v.iter() { - <span class="kw">for </span>lane <span class="kw">in </span><span class="number">0</span>..<<span class="macro-nonterminal">$ty</span>>::lanes() { - <span class="kw">let </span>low = <<span class="macro-nonterminal">$ty</span>>::splat(<span class="number">0.0 </span><span class="kw">as </span><span class="macro-nonterminal">$f_scalar</span>).replace(lane, low_scalar); - <span class="kw">let </span>high = <<span class="macro-nonterminal">$ty</span>>::splat(<span class="number">1.0 </span><span class="kw">as </span><span class="macro-nonterminal">$f_scalar</span>).replace(lane, high_scalar); - <span class="kw">let </span>my_uniform = Uniform::new(low, high); - <span class="kw">let </span>my_incl_uniform = Uniform::new_inclusive(low, high); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">100 </span>{ - <span class="kw">let </span>v = rng.sample(my_uniform).extract(lane); - <span class="macro">assert!</span>(low_scalar <= v && v < high_scalar); - <span class="kw">let </span>v = rng.sample(my_incl_uniform).extract(lane); - <span class="macro">assert!</span>(low_scalar <= v && v <= high_scalar); - <span class="kw">let </span>v = <<span class="macro-nonterminal">$ty </span><span class="kw">as </span>SampleUniform>::Sampler - ::sample_single(low, high, <span class="kw-2">&mut </span>rng).extract(lane); - <span class="macro">assert!</span>(low_scalar <= v && v < high_scalar); - } - - <span class="macro">assert_eq!</span>( - rng.sample(Uniform::new_inclusive(low, low)).extract(lane), - low_scalar - ); - - <span class="macro">assert_eq!</span>(zero_rng.sample(my_uniform).extract(lane), low_scalar); - <span class="macro">assert_eq!</span>(zero_rng.sample(my_incl_uniform).extract(lane), low_scalar); - <span class="macro">assert_eq!</span>(<<span class="macro-nonterminal">$ty </span><span class="kw">as </span>SampleUniform>::Sampler - ::sample_single(low, high, <span class="kw-2">&mut </span>zero_rng) - .extract(lane), low_scalar); - <span class="macro">assert!</span>(max_rng.sample(my_uniform).extract(lane) < high_scalar); - <span class="macro">assert!</span>(max_rng.sample(my_incl_uniform).extract(lane) <= high_scalar); - - <span class="comment">// Don't run this test for really tiny differences between high and low - // since for those rounding might result in selecting high for a very - // long time. - </span><span class="kw">if </span>(high_scalar - low_scalar) > <span class="number">0.0001 </span>{ - <span class="kw">let </span><span class="kw-2">mut </span>lowering_max_rng = StepRng::new( - <span class="number">0xffff_ffff_ffff_ffff</span>, - (-<span class="number">1i64 </span><< <span class="macro-nonterminal">$bits_shifted</span>) <span class="kw">as </span>u64, - ); - <span class="macro">assert!</span>( - <<span class="macro-nonterminal">$ty </span><span class="kw">as </span>SampleUniform>::Sampler - ::sample_single(low, high, <span class="kw-2">&mut </span>lowering_max_rng) - .extract(lane) < high_scalar - ); - } - } - } - - <span class="macro">assert_eq!</span>( - rng.sample(Uniform::new_inclusive( - ::core::<span class="macro-nonterminal">$f_scalar::MAX</span>, - ::core::<span class="macro-nonterminal">$f_scalar::MAX - </span>)), - ::core::<span class="macro-nonterminal">$f_scalar::MAX - </span>); - <span class="macro">assert_eq!</span>( - rng.sample(Uniform::new_inclusive( - -::core::<span class="macro-nonterminal">$f_scalar::MAX</span>, - -::core::<span class="macro-nonterminal">$f_scalar::MAX - </span>)), - -::core::<span class="macro-nonterminal">$f_scalar::MAX - </span>); - }}; - } - - <span class="macro">t!</span>(f32, f32, <span class="number">32 </span>- <span class="number">23</span>); - <span class="macro">t!</span>(f64, f64, <span class="number">64 </span>- <span class="number">52</span>); - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span>{ - <span class="macro">t!</span>(f32x2, f32, <span class="number">32 </span>- <span class="number">23</span>); - <span class="macro">t!</span>(f32x4, f32, <span class="number">32 </span>- <span class="number">23</span>); - <span class="macro">t!</span>(f32x8, f32, <span class="number">32 </span>- <span class="number">23</span>); - <span class="macro">t!</span>(f32x16, f32, <span class="number">32 </span>- <span class="number">23</span>); - <span class="macro">t!</span>(f64x2, f64, <span class="number">64 </span>- <span class="number">52</span>); - <span class="macro">t!</span>(f64x4, f64, <span class="number">64 </span>- <span class="number">52</span>); - <span class="macro">t!</span>(f64x8, f64, <span class="number">64 </span>- <span class="number">52</span>); - } - } - - <span class="attribute">#[test] - #[should_panic] - </span><span class="kw">fn </span>test_float_overflow() { - <span class="kw">let _ </span>= Uniform::from(::core::f64::MIN..::core::f64::MAX); - } - - <span class="attribute">#[test] - #[should_panic] - </span><span class="kw">fn </span>test_float_overflow_single() { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">252</span>); - rng.gen_range(::core::f64::MIN..::core::f64::MAX); - } - - <span class="attribute">#[test] - #[cfg(all( - feature = <span class="string">"std"</span>, - not(target_arch = <span class="string">"wasm32"</span>), - not(target_arch = <span class="string">"asmjs"</span>) - ))] - </span><span class="kw">fn </span>test_float_assertions() { - <span class="kw">use </span><span class="kw">super</span>::SampleUniform; - <span class="kw">use </span>std::panic::catch_unwind; - <span class="kw">fn </span>range<T: SampleUniform>(low: T, high: T) { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">253</span>); - T::Sampler::sample_single(low, high, <span class="kw-2">&mut </span>rng); - } - - <span class="macro">macro_rules! </span>t { - (<span class="macro-nonterminal">$ty</span>:ident, <span class="macro-nonterminal">$f_scalar</span>:ident) => {{ - <span class="kw">let </span>v: <span class="kw-2">&</span>[(<span class="macro-nonterminal">$f_scalar</span>, <span class="macro-nonterminal">$f_scalar</span>)] = <span class="kw-2">&</span>[ - (::std::<span class="macro-nonterminal">$f_scalar::NAN</span>, <span class="number">0.0</span>), - (<span class="number">1.0</span>, ::std::<span class="macro-nonterminal">$f_scalar::NAN</span>), - (::std::<span class="macro-nonterminal">$f_scalar::NAN</span>, ::std::<span class="macro-nonterminal">$f_scalar::NAN</span>), - (<span class="number">1.0</span>, <span class="number">0.5</span>), - (::std::<span class="macro-nonterminal">$f_scalar::MAX</span>, -::std::<span class="macro-nonterminal">$f_scalar::MAX</span>), - (::std::<span class="macro-nonterminal">$f_scalar::INFINITY</span>, ::std::<span class="macro-nonterminal">$f_scalar::INFINITY</span>), - ( - ::std::<span class="macro-nonterminal">$f_scalar::NEG_INFINITY</span>, - ::std::<span class="macro-nonterminal">$f_scalar::NEG_INFINITY</span>, - ), - (::std::<span class="macro-nonterminal">$f_scalar::NEG_INFINITY</span>, <span class="number">5.0</span>), - (<span class="number">5.0</span>, ::std::<span class="macro-nonterminal">$f_scalar::INFINITY</span>), - (::std::<span class="macro-nonterminal">$f_scalar::NAN</span>, ::std::<span class="macro-nonterminal">$f_scalar::INFINITY</span>), - (::std::<span class="macro-nonterminal">$f_scalar::NEG_INFINITY</span>, ::std::<span class="macro-nonterminal">$f_scalar::NAN</span>), - (::std::<span class="macro-nonterminal">$f_scalar::NEG_INFINITY</span>, ::std::<span class="macro-nonterminal">$f_scalar::INFINITY</span>), - ]; - <span class="kw">for </span><span class="kw-2">&</span>(low_scalar, high_scalar) <span class="kw">in </span>v.iter() { - <span class="kw">for </span>lane <span class="kw">in </span><span class="number">0</span>..<<span class="macro-nonterminal">$ty</span>>::lanes() { - <span class="kw">let </span>low = <<span class="macro-nonterminal">$ty</span>>::splat(<span class="number">0.0 </span><span class="kw">as </span><span class="macro-nonterminal">$f_scalar</span>).replace(lane, low_scalar); - <span class="kw">let </span>high = <<span class="macro-nonterminal">$ty</span>>::splat(<span class="number">1.0 </span><span class="kw">as </span><span class="macro-nonterminal">$f_scalar</span>).replace(lane, high_scalar); - <span class="macro">assert!</span>(catch_unwind(|| range(low, high)).is_err()); - <span class="macro">assert!</span>(catch_unwind(|| Uniform::new(low, high)).is_err()); - <span class="macro">assert!</span>(catch_unwind(|| Uniform::new_inclusive(low, high)).is_err()); - <span class="macro">assert!</span>(catch_unwind(|| range(low, low)).is_err()); - <span class="macro">assert!</span>(catch_unwind(|| Uniform::new(low, low)).is_err()); - } - } - }}; - } - - <span class="macro">t!</span>(f32, f32); - <span class="macro">t!</span>(f64, f64); - <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] - </span>{ - <span class="macro">t!</span>(f32x2, f32); - <span class="macro">t!</span>(f32x4, f32); - <span class="macro">t!</span>(f32x8, f32); - <span class="macro">t!</span>(f32x16, f32); - <span class="macro">t!</span>(f64x2, f64); - <span class="macro">t!</span>(f64x4, f64); - <span class="macro">t!</span>(f64x8, f64); - } - } - - - <span class="attribute">#[test] - #[cfg_attr(miri, ignore)] </span><span class="comment">// Miri is too slow - </span><span class="kw">fn </span>test_durations() { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">253</span>); - - <span class="kw">let </span>v = <span class="kw-2">&</span>[ - (Duration::new(<span class="number">10</span>, <span class="number">50000</span>), Duration::new(<span class="number">100</span>, <span class="number">1234</span>)), - (Duration::new(<span class="number">0</span>, <span class="number">100</span>), Duration::new(<span class="number">1</span>, <span class="number">50</span>)), - ( - Duration::new(<span class="number">0</span>, <span class="number">0</span>), - Duration::new(u64::max_value(), <span class="number">999_999_999</span>), - ), - ]; - <span class="kw">for </span><span class="kw-2">&</span>(low, high) <span class="kw">in </span>v.iter() { - <span class="kw">let </span>my_uniform = Uniform::new(low, high); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">1000 </span>{ - <span class="kw">let </span>v = rng.sample(my_uniform); - <span class="macro">assert!</span>(low <= v && v < high); - } - } - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_custom_uniform() { - <span class="kw">use </span><span class="kw">crate</span>::distributions::uniform::{ - SampleBorrow, SampleUniform, UniformFloat, UniformSampler, - }; - <span class="attribute">#[derive(Clone, Copy, PartialEq, PartialOrd)] - </span><span class="kw">struct </span>MyF32 { - x: f32, - } - <span class="attribute">#[derive(Clone, Copy, Debug)] - </span><span class="kw">struct </span>UniformMyF32(UniformFloat<f32>); - <span class="kw">impl </span>UniformSampler <span class="kw">for </span>UniformMyF32 { - <span class="kw">type </span>X = MyF32; - - <span class="kw">fn </span>new<B1, B2>(low: B1, high: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - UniformMyF32(UniformFloat::<f32>::new(low.borrow().x, high.borrow().x)) - } - - <span class="kw">fn </span>new_inclusive<B1, B2>(low: B1, high: B2) -> <span class="self">Self - </span><span class="kw">where - </span>B1: SampleBorrow<<span class="self">Self</span>::X> + Sized, - B2: SampleBorrow<<span class="self">Self</span>::X> + Sized, - { - UniformSampler::new(low, high) - } - - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="self">Self</span>::X { - MyF32 { - x: <span class="self">self</span>.<span class="number">0</span>.sample(rng), - } - } - } - <span class="kw">impl </span>SampleUniform <span class="kw">for </span>MyF32 { - <span class="kw">type </span>Sampler = UniformMyF32; - } - - <span class="kw">let </span>(low, high) = (MyF32 { x: <span class="number">17.0f32 </span>}, MyF32 { x: <span class="number">22.0f32 </span>}); - <span class="kw">let </span>uniform = Uniform::new(low, high); - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">804</span>); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">100 </span>{ - <span class="kw">let </span>x: MyF32 = rng.sample(uniform); - <span class="macro">assert!</span>(low <= x && x < high); - } - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_uniform_from_std_range() { - <span class="kw">let </span>r = Uniform::from(<span class="number">2u32</span>..<span class="number">7</span>); - <span class="macro">assert_eq!</span>(r.<span class="number">0</span>.low, <span class="number">2</span>); - <span class="macro">assert_eq!</span>(r.<span class="number">0</span>.range, <span class="number">5</span>); - <span class="kw">let </span>r = Uniform::from(<span class="number">2.0f64</span>..<span class="number">7.0</span>); - <span class="macro">assert_eq!</span>(r.<span class="number">0</span>.low, <span class="number">2.0</span>); - <span class="macro">assert_eq!</span>(r.<span class="number">0</span>.scale, <span class="number">5.0</span>); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_uniform_from_std_range_inclusive() { - <span class="kw">let </span>r = Uniform::from(<span class="number">2u32</span>..=<span class="number">6</span>); - <span class="macro">assert_eq!</span>(r.<span class="number">0</span>.low, <span class="number">2</span>); - <span class="macro">assert_eq!</span>(r.<span class="number">0</span>.range, <span class="number">5</span>); - <span class="kw">let </span>r = Uniform::from(<span class="number">2.0f64</span>..=<span class="number">7.0</span>); - <span class="macro">assert_eq!</span>(r.<span class="number">0</span>.low, <span class="number">2.0</span>); - <span class="macro">assert!</span>(r.<span class="number">0</span>.scale > <span class="number">5.0</span>); - <span class="macro">assert!</span>(r.<span class="number">0</span>.scale < <span class="number">5.0 </span>+ <span class="number">1e-14</span>); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>value_stability() { - <span class="kw">fn </span>test_samples<T: SampleUniform + Copy + core::fmt::Debug + PartialEq>( - lb: T, ub: T, expected_single: <span class="kw-2">&</span>[T], expected_multiple: <span class="kw-2">&</span>[T], - ) <span class="kw">where </span>Uniform<T>: Distribution<T> { - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">897</span>); - <span class="kw">let </span><span class="kw-2">mut </span>buf = [lb; <span class="number">3</span>]; - - <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&mut </span>buf { - <span class="kw-2">*</span>x = T::Sampler::sample_single(lb, ub, <span class="kw-2">&mut </span>rng); - } - <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf, expected_single); - - <span class="kw">let </span>distr = Uniform::new(lb, ub); - <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&mut </span>buf { - <span class="kw-2">*</span>x = rng.sample(<span class="kw-2">&</span>distr); - } - <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf, expected_multiple); - } - - <span class="comment">// We test on a sub-set of types; possibly we should do more. - // TODO: SIMD types - - </span>test_samples(<span class="number">11u8</span>, <span class="number">219</span>, <span class="kw-2">&</span>[<span class="number">17</span>, <span class="number">66</span>, <span class="number">214</span>], <span class="kw-2">&</span>[<span class="number">181</span>, <span class="number">93</span>, <span class="number">165</span>]); - test_samples(<span class="number">11u32</span>, <span class="number">219</span>, <span class="kw-2">&</span>[<span class="number">17</span>, <span class="number">66</span>, <span class="number">214</span>], <span class="kw-2">&</span>[<span class="number">181</span>, <span class="number">93</span>, <span class="number">165</span>]); - - test_samples(<span class="number">0f32</span>, <span class="number">1e-2f32</span>, <span class="kw-2">&</span>[<span class="number">0.0003070104</span>, <span class="number">0.0026630748</span>, <span class="number">0.00979833</span>], <span class="kw-2">&</span>[ - <span class="number">0.008194133</span>, - <span class="number">0.00398172</span>, - <span class="number">0.007428536</span>, - ]); - test_samples( - -<span class="number">1e10f64</span>, - <span class="number">1e10f64</span>, - <span class="kw-2">&</span>[-<span class="number">4673848682.871551</span>, <span class="number">6388267422.932352</span>, <span class="number">4857075081.198343</span>], - <span class="kw-2">&</span>[<span class="number">1173375212.1808167</span>, <span class="number">1917642852.109581</span>, <span class="number">2365076174.3153973</span>], - ); - - test_samples( - Duration::new(<span class="number">2</span>, <span class="number">0</span>), - Duration::new(<span class="number">4</span>, <span class="number">0</span>), - <span class="kw-2">&</span>[ - Duration::new(<span class="number">2</span>, <span class="number">532615131</span>), - Duration::new(<span class="number">3</span>, <span class="number">638826742</span>), - Duration::new(<span class="number">3</span>, <span class="number">485707508</span>), - ], - <span class="kw-2">&</span>[ - Duration::new(<span class="number">3</span>, <span class="number">117337521</span>), - Duration::new(<span class="number">3</span>, <span class="number">191764285</span>), - Duration::new(<span class="number">3</span>, <span class="number">236507617</span>), - ], - ); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>uniform_distributions_can_be_compared() { - <span class="macro">assert_eq!</span>(Uniform::new(<span class="number">1.0</span>, <span class="number">2.0</span>), Uniform::new(<span class="number">1.0</span>, <span class="number">2.0</span>)); - - <span class="comment">// To cover UniformInt - </span><span class="macro">assert_eq!</span>(Uniform::new(<span class="number">1 </span><span class="kw">as </span>u32, <span class="number">2 </span><span class="kw">as </span>u32), Uniform::new(<span class="number">1 </span><span class="kw">as </span>u32, <span class="number">2 </span><span class="kw">as </span>u32)); - } -} -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/utils.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/utils.rs.html deleted file mode 100644 index 118f6fa..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/utils.rs.html +++ /dev/null @@ -1,861 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/utils.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>utils.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" 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-<span id="410">410</span> -<span id="411">411</span> -<span id="412">412</span> -<span id="413">413</span> -<span id="414">414</span> -<span id="415">415</span> -<span id="416">416</span> -<span id="417">417</span> -<span id="418">418</span> -<span id="419">419</span> -<span id="420">420</span> -<span id="421">421</span> -<span id="422">422</span> -<span id="423">423</span> -<span id="424">424</span> -<span id="425">425</span> -<span id="426">426</span> -<span id="427">427</span> -<span id="428">428</span> -<span id="429">429</span> -</pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! Math helper functions - -</span><span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] </span><span class="kw">use </span>packed_simd::<span class="kw-2">*</span>; - - -<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>WideningMultiply<RHS = <span class="self">Self</span>> { - <span class="kw">type </span>Output; - - <span class="kw">fn </span>wmul(<span class="self">self</span>, x: RHS) -> <span class="self">Self</span>::Output; -} - -<span class="macro">macro_rules! </span>wmul_impl { - (<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$wide</span>:ty, <span class="macro-nonterminal">$shift</span>:expr) => { - <span class="kw">impl </span>WideningMultiply <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="kw">type </span>Output = (<span class="macro-nonterminal">$ty</span>, <span class="macro-nonterminal">$ty</span>); - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>wmul(<span class="self">self</span>, x: <span class="macro-nonterminal">$ty</span>) -> <span class="self">Self</span>::Output { - <span class="kw">let </span>tmp = (<span class="self">self </span><span class="kw">as </span><span class="macro-nonterminal">$wide</span>) * (x <span class="kw">as </span><span class="macro-nonterminal">$wide</span>); - ((tmp >> <span class="macro-nonterminal">$shift</span>) <span class="kw">as </span><span class="macro-nonterminal">$ty</span>, tmp <span class="kw">as </span><span class="macro-nonterminal">$ty</span>) - } - } - }; - - <span class="comment">// simd bulk implementation - </span>($((<span class="macro-nonterminal">$ty</span>:ident, <span class="macro-nonterminal">$wide</span>:ident),)+, <span class="macro-nonterminal">$shift</span>:expr) => { - $( - <span class="kw">impl </span>WideningMultiply <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="kw">type </span>Output = (<span class="macro-nonterminal">$ty</span>, <span class="macro-nonterminal">$ty</span>); - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>wmul(<span class="self">self</span>, x: <span class="macro-nonterminal">$ty</span>) -> <span class="self">Self</span>::Output { - <span class="comment">// For supported vectors, this should compile to a couple - // supported multiply & swizzle instructions (no actual - // casting). - // TODO: optimize - </span><span class="kw">let </span>y: <span class="macro-nonterminal">$wide </span>= <span class="self">self</span>.cast(); - <span class="kw">let </span>x: <span class="macro-nonterminal">$wide </span>= x.cast(); - <span class="kw">let </span>tmp = y * x; - <span class="kw">let </span>hi: <span class="macro-nonterminal">$ty </span>= (tmp >> <span class="macro-nonterminal">$shift</span>).cast(); - <span class="kw">let </span>lo: <span class="macro-nonterminal">$ty </span>= tmp.cast(); - (hi, lo) - } - } - )+ - }; -} -<span class="macro">wmul_impl! </span>{ u8, u16, <span class="number">8 </span>} -<span class="macro">wmul_impl! </span>{ u16, u32, <span class="number">16 </span>} -<span class="macro">wmul_impl! </span>{ u32, u64, <span class="number">32 </span>} -<span class="macro">wmul_impl! </span>{ u64, u128, <span class="number">64 </span>} - -<span class="comment">// This code is a translation of the __mulddi3 function in LLVM's -// compiler-rt. It is an optimised variant of the common method -// `(a + b) * (c + d) = ac + ad + bc + bd`. -// -// For some reason LLVM can optimise the C version very well, but -// keeps shuffling registers in this Rust translation. -</span><span class="macro">macro_rules! </span>wmul_impl_large { - (<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$half</span>:expr) => { - <span class="kw">impl </span>WideningMultiply <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="kw">type </span>Output = (<span class="macro-nonterminal">$ty</span>, <span class="macro-nonterminal">$ty</span>); - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>wmul(<span class="self">self</span>, b: <span class="macro-nonterminal">$ty</span>) -> <span class="self">Self</span>::Output { - <span class="kw">const </span>LOWER_MASK: <span class="macro-nonterminal">$ty </span>= !<span class="number">0 </span>>> <span class="macro-nonterminal">$half</span>; - <span class="kw">let </span><span class="kw-2">mut </span>low = (<span class="self">self </span>& LOWER_MASK).wrapping_mul(b & LOWER_MASK); - <span class="kw">let </span><span class="kw-2">mut </span>t = low >> <span class="macro-nonterminal">$half</span>; - low &= LOWER_MASK; - t += (<span class="self">self </span>>> <span class="macro-nonterminal">$half</span>).wrapping_mul(b & LOWER_MASK); - low += (t & LOWER_MASK) << <span class="macro-nonterminal">$half</span>; - <span class="kw">let </span><span class="kw-2">mut </span>high = t >> <span class="macro-nonterminal">$half</span>; - t = low >> <span class="macro-nonterminal">$half</span>; - low &= LOWER_MASK; - t += (b >> <span class="macro-nonterminal">$half</span>).wrapping_mul(<span class="self">self </span>& LOWER_MASK); - low += (t & LOWER_MASK) << <span class="macro-nonterminal">$half</span>; - high += t >> <span class="macro-nonterminal">$half</span>; - high += (<span class="self">self </span>>> <span class="macro-nonterminal">$half</span>).wrapping_mul(b >> <span class="macro-nonterminal">$half</span>); - - (high, low) - } - } - }; - - <span class="comment">// simd bulk implementation - </span>(($(<span class="macro-nonterminal">$ty</span>:ty,)+) <span class="macro-nonterminal">$scalar</span>:ty, <span class="macro-nonterminal">$half</span>:expr) => { - $( - <span class="kw">impl </span>WideningMultiply <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="kw">type </span>Output = (<span class="macro-nonterminal">$ty</span>, <span class="macro-nonterminal">$ty</span>); - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>wmul(<span class="self">self</span>, b: <span class="macro-nonterminal">$ty</span>) -> <span class="self">Self</span>::Output { - <span class="comment">// needs wrapping multiplication - </span><span class="kw">const </span>LOWER_MASK: <span class="macro-nonterminal">$scalar </span>= !<span class="number">0 </span>>> <span class="macro-nonterminal">$half</span>; - <span class="kw">let </span><span class="kw-2">mut </span>low = (<span class="self">self </span>& LOWER_MASK) * (b & LOWER_MASK); - <span class="kw">let </span><span class="kw-2">mut </span>t = low >> <span class="macro-nonterminal">$half</span>; - low &= LOWER_MASK; - t += (<span class="self">self </span>>> <span class="macro-nonterminal">$half</span>) * (b & LOWER_MASK); - low += (t & LOWER_MASK) << <span class="macro-nonterminal">$half</span>; - <span class="kw">let </span><span class="kw-2">mut </span>high = t >> <span class="macro-nonterminal">$half</span>; - t = low >> <span class="macro-nonterminal">$half</span>; - low &= LOWER_MASK; - t += (b >> <span class="macro-nonterminal">$half</span>) * (<span class="self">self </span>& LOWER_MASK); - low += (t & LOWER_MASK) << <span class="macro-nonterminal">$half</span>; - high += t >> <span class="macro-nonterminal">$half</span>; - high += (<span class="self">self </span>>> <span class="macro-nonterminal">$half</span>) * (b >> <span class="macro-nonterminal">$half</span>); - - (high, low) - } - } - )+ - }; -} -<span class="macro">wmul_impl_large! </span>{ u128, <span class="number">64 </span>} - -<span class="macro">macro_rules! </span>wmul_impl_usize { - (<span class="macro-nonterminal">$ty</span>:ty) => { - <span class="kw">impl </span>WideningMultiply <span class="kw">for </span>usize { - <span class="kw">type </span>Output = (usize, usize); - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>wmul(<span class="self">self</span>, x: usize) -> <span class="self">Self</span>::Output { - <span class="kw">let </span>(high, low) = (<span class="self">self </span><span class="kw">as </span><span class="macro-nonterminal">$ty</span>).wmul(x <span class="kw">as </span><span class="macro-nonterminal">$ty</span>); - (high <span class="kw">as </span>usize, low <span class="kw">as </span>usize) - } - } - }; -} -<span class="attribute">#[cfg(target_pointer_width = <span class="string">"16"</span>)] -</span><span class="macro">wmul_impl_usize! </span>{ u16 } -<span class="attribute">#[cfg(target_pointer_width = <span class="string">"32"</span>)] -</span><span class="macro">wmul_impl_usize! </span>{ u32 } -<span class="attribute">#[cfg(target_pointer_width = <span class="string">"64"</span>)] -</span><span class="macro">wmul_impl_usize! </span>{ u64 } - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="kw">mod </span>simd_wmul { - <span class="kw">use super</span>::<span class="kw-2">*</span>; - <span class="attribute">#[cfg(target_arch = <span class="string">"x86"</span>)] </span><span class="kw">use </span>core::arch::x86::<span class="kw-2">*</span>; - <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] </span><span class="kw">use </span>core::arch::x86_64::<span class="kw-2">*</span>; - - <span class="macro">wmul_impl! </span>{ - (u8x2, u16x2), - (u8x4, u16x4), - (u8x8, u16x8), - (u8x16, u16x16), - (u8x32, u16x32),, - <span class="number">8 - </span>} - - <span class="macro">wmul_impl! </span>{ (u16x2, u32x2),, <span class="number">16 </span>} - <span class="macro">wmul_impl! </span>{ (u16x4, u32x4),, <span class="number">16 </span>} - <span class="attribute">#[cfg(not(target_feature = <span class="string">"sse2"</span>))] - </span><span class="macro">wmul_impl! </span>{ (u16x8, u32x8),, <span class="number">16 </span>} - <span class="attribute">#[cfg(not(target_feature = <span class="string">"avx2"</span>))] - </span><span class="macro">wmul_impl! </span>{ (u16x16, u32x16),, <span class="number">16 </span>} - - <span class="comment">// 16-bit lane widths allow use of the x86 `mulhi` instructions, which - // means `wmul` can be implemented with only two instructions. - </span><span class="attribute">#[allow(unused_macros)] - </span><span class="macro">macro_rules! </span>wmul_impl_16 { - (<span class="macro-nonterminal">$ty</span>:ident, <span class="macro-nonterminal">$intrinsic</span>:ident, <span class="macro-nonterminal">$mulhi</span>:ident, <span class="macro-nonterminal">$mullo</span>:ident) => { - <span class="kw">impl </span>WideningMultiply <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="kw">type </span>Output = (<span class="macro-nonterminal">$ty</span>, <span class="macro-nonterminal">$ty</span>); - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>wmul(<span class="self">self</span>, x: <span class="macro-nonterminal">$ty</span>) -> <span class="self">Self</span>::Output { - <span class="kw">let </span>b = <span class="macro-nonterminal">$intrinsic::from_bits</span>(x); - <span class="kw">let </span>a = <span class="macro-nonterminal">$intrinsic::from_bits</span>(<span class="self">self</span>); - <span class="kw">let </span>hi = <span class="macro-nonterminal">$ty::from_bits</span>(<span class="kw">unsafe </span>{ <span class="macro-nonterminal">$mulhi</span>(a, b) }); - <span class="kw">let </span>lo = <span class="macro-nonterminal">$ty::from_bits</span>(<span class="kw">unsafe </span>{ <span class="macro-nonterminal">$mullo</span>(a, b) }); - (hi, lo) - } - } - }; - } - - <span class="attribute">#[cfg(target_feature = <span class="string">"sse2"</span>)] - </span><span class="macro">wmul_impl_16! </span>{ u16x8, __m128i, _mm_mulhi_epu16, _mm_mullo_epi16 } - <span class="attribute">#[cfg(target_feature = <span class="string">"avx2"</span>)] - </span><span class="macro">wmul_impl_16! </span>{ u16x16, __m256i, _mm256_mulhi_epu16, _mm256_mullo_epi16 } - <span class="comment">// FIXME: there are no `__m512i` types in stdsimd yet, so `wmul::<u16x32>` - // cannot use the same implementation. - - </span><span class="macro">wmul_impl! </span>{ - (u32x2, u64x2), - (u32x4, u64x4), - (u32x8, u64x8),, - <span class="number">32 - </span>} - - <span class="comment">// TODO: optimize, this seems to seriously slow things down - </span><span class="macro">wmul_impl_large! </span>{ (u8x64,) u8, <span class="number">4 </span>} - <span class="macro">wmul_impl_large! </span>{ (u16x32,) u16, <span class="number">8 </span>} - <span class="macro">wmul_impl_large! </span>{ (u32x16,) u32, <span class="number">16 </span>} - <span class="macro">wmul_impl_large! </span>{ (u64x2, u64x4, u64x8,) u64, <span class="number">32 </span>} -} - -<span class="doccomment">/// Helper trait when dealing with scalar and SIMD floating point types. -</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>FloatSIMDUtils { - <span class="comment">// `PartialOrd` for vectors compares lexicographically. We want to compare all - // the individual SIMD lanes instead, and get the combined result over all - // lanes. This is possible using something like `a.lt(b).all()`, but we - // implement it as a trait so we can write the same code for `f32` and `f64`. - // Only the comparison functions we need are implemented. - </span><span class="kw">fn </span>all_lt(<span class="self">self</span>, other: <span class="self">Self</span>) -> bool; - <span class="kw">fn </span>all_le(<span class="self">self</span>, other: <span class="self">Self</span>) -> bool; - <span class="kw">fn </span>all_finite(<span class="self">self</span>) -> bool; - - <span class="kw">type </span>Mask; - <span class="kw">fn </span>finite_mask(<span class="self">self</span>) -> <span class="self">Self</span>::Mask; - <span class="kw">fn </span>gt_mask(<span class="self">self</span>, other: <span class="self">Self</span>) -> <span class="self">Self</span>::Mask; - <span class="kw">fn </span>ge_mask(<span class="self">self</span>, other: <span class="self">Self</span>) -> <span class="self">Self</span>::Mask; - - <span class="comment">// Decrease all lanes where the mask is `true` to the next lower value - // representable by the floating-point type. At least one of the lanes - // must be set. - </span><span class="kw">fn </span>decrease_masked(<span class="self">self</span>, mask: <span class="self">Self</span>::Mask) -> <span class="self">Self</span>; - - <span class="comment">// Convert from int value. Conversion is done while retaining the numerical - // value, not by retaining the binary representation. - </span><span class="kw">type </span>UInt; - <span class="kw">fn </span>cast_from_int(i: <span class="self">Self</span>::UInt) -> <span class="self">Self</span>; -} - -<span class="doccomment">/// Implement functions available in std builds but missing from core primitives -</span><span class="attribute">#[cfg(not(std))] -</span><span class="comment">// False positive: We are following `std` here. -</span><span class="attribute">#[allow(clippy::wrong_self_convention)] -</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>Float: Sized { - <span class="kw">fn </span>is_nan(<span class="self">self</span>) -> bool; - <span class="kw">fn </span>is_infinite(<span class="self">self</span>) -> bool; - <span class="kw">fn </span>is_finite(<span class="self">self</span>) -> bool; -} - -<span class="doccomment">/// Implement functions on f32/f64 to give them APIs similar to SIMD types -</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>FloatAsSIMD: Sized { - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>lanes() -> usize { - <span class="number">1 - </span>} - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>splat(scalar: <span class="self">Self</span>) -> <span class="self">Self </span>{ - scalar - } - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>extract(<span class="self">self</span>, index: usize) -> <span class="self">Self </span>{ - <span class="macro">debug_assert_eq!</span>(index, <span class="number">0</span>); - <span class="self">self - </span>} - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>replace(<span class="self">self</span>, index: usize, new_value: <span class="self">Self</span>) -> <span class="self">Self </span>{ - <span class="macro">debug_assert_eq!</span>(index, <span class="number">0</span>); - new_value - } -} - -<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>BoolAsSIMD: Sized { - <span class="kw">fn </span>any(<span class="self">self</span>) -> bool; - <span class="kw">fn </span>all(<span class="self">self</span>) -> bool; - <span class="kw">fn </span>none(<span class="self">self</span>) -> bool; -} - -<span class="kw">impl </span>BoolAsSIMD <span class="kw">for </span>bool { - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>any(<span class="self">self</span>) -> bool { - <span class="self">self - </span>} - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>all(<span class="self">self</span>) -> bool { - <span class="self">self - </span>} - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>none(<span class="self">self</span>) -> bool { - !<span class="self">self - </span>} -} - -<span class="macro">macro_rules! </span>scalar_float_impl { - (<span class="macro-nonterminal">$ty</span>:ident, <span class="macro-nonterminal">$uty</span>:ident) => { - <span class="attribute">#[cfg(not(std))] - </span><span class="kw">impl </span>Float <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="attribute">#[inline] - </span><span class="kw">fn </span>is_nan(<span class="self">self</span>) -> bool { - <span class="self">self </span>!= <span class="self">self - </span>} - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>is_infinite(<span class="self">self</span>) -> bool { - <span class="self">self </span>== ::core::<span class="macro-nonterminal">$ty::INFINITY </span>|| <span class="self">self </span>== ::core::<span class="macro-nonterminal">$ty::NEG_INFINITY - </span>} - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>is_finite(<span class="self">self</span>) -> bool { - !(<span class="self">self</span>.is_nan() || <span class="self">self</span>.is_infinite()) - } - } - - <span class="kw">impl </span>FloatSIMDUtils <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="kw">type </span>Mask = bool; - <span class="kw">type </span>UInt = <span class="macro-nonterminal">$uty</span>; - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>all_lt(<span class="self">self</span>, other: <span class="self">Self</span>) -> bool { - <span class="self">self </span>< other - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>all_le(<span class="self">self</span>, other: <span class="self">Self</span>) -> bool { - <span class="self">self </span><= other - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>all_finite(<span class="self">self</span>) -> bool { - <span class="self">self</span>.is_finite() - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>finite_mask(<span class="self">self</span>) -> <span class="self">Self</span>::Mask { - <span class="self">self</span>.is_finite() - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>gt_mask(<span class="self">self</span>, other: <span class="self">Self</span>) -> <span class="self">Self</span>::Mask { - <span class="self">self </span>> other - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>ge_mask(<span class="self">self</span>, other: <span class="self">Self</span>) -> <span class="self">Self</span>::Mask { - <span class="self">self </span>>= other - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>decrease_masked(<span class="self">self</span>, mask: <span class="self">Self</span>::Mask) -> <span class="self">Self </span>{ - <span class="macro">debug_assert!</span>(mask, <span class="string">"At least one lane must be set"</span>); - <<span class="macro-nonterminal">$ty</span>>::from_bits(<span class="self">self</span>.to_bits() - <span class="number">1</span>) - } - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>cast_from_int(i: <span class="self">Self</span>::UInt) -> <span class="self">Self </span>{ - i <span class="kw">as </span><span class="macro-nonterminal">$ty - </span>} - } - - <span class="kw">impl </span>FloatAsSIMD <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{} - }; -} - -<span class="macro">scalar_float_impl!</span>(f32, u32); -<span class="macro">scalar_float_impl!</span>(f64, u64); - - -<span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] -</span><span class="macro">macro_rules! </span>simd_impl { - (<span class="macro-nonterminal">$ty</span>:ident, <span class="macro-nonterminal">$f_scalar</span>:ident, <span class="macro-nonterminal">$mty</span>:ident, <span class="macro-nonterminal">$uty</span>:ident) => { - <span class="kw">impl </span>FloatSIMDUtils <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ - <span class="kw">type </span>Mask = <span class="macro-nonterminal">$mty</span>; - <span class="kw">type </span>UInt = <span class="macro-nonterminal">$uty</span>; - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>all_lt(<span class="self">self</span>, other: <span class="self">Self</span>) -> bool { - <span class="self">self</span>.lt(other).all() - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>all_le(<span class="self">self</span>, other: <span class="self">Self</span>) -> bool { - <span class="self">self</span>.le(other).all() - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>all_finite(<span class="self">self</span>) -> bool { - <span class="self">self</span>.finite_mask().all() - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>finite_mask(<span class="self">self</span>) -> <span class="self">Self</span>::Mask { - <span class="comment">// This can possibly be done faster by checking bit patterns - </span><span class="kw">let </span>neg_inf = <span class="macro-nonterminal">$ty::splat</span>(::core::<span class="macro-nonterminal">$f_scalar::NEG_INFINITY</span>); - <span class="kw">let </span>pos_inf = <span class="macro-nonterminal">$ty::splat</span>(::core::<span class="macro-nonterminal">$f_scalar::INFINITY</span>); - <span class="self">self</span>.gt(neg_inf) & <span class="self">self</span>.lt(pos_inf) - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>gt_mask(<span class="self">self</span>, other: <span class="self">Self</span>) -> <span class="self">Self</span>::Mask { - <span class="self">self</span>.gt(other) - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>ge_mask(<span class="self">self</span>, other: <span class="self">Self</span>) -> <span class="self">Self</span>::Mask { - <span class="self">self</span>.ge(other) - } - - <span class="attribute">#[inline(always)] - </span><span class="kw">fn </span>decrease_masked(<span class="self">self</span>, mask: <span class="self">Self</span>::Mask) -> <span class="self">Self </span>{ - <span class="comment">// Casting a mask into ints will produce all bits set for - // true, and 0 for false. Adding that to the binary - // representation of a float means subtracting one from - // the binary representation, resulting in the next lower - // value representable by $ty. This works even when the - // current value is infinity. - </span><span class="macro">debug_assert!</span>(mask.any(), <span class="string">"At least one lane must be set"</span>); - <<span class="macro-nonterminal">$ty</span>>::from_bits(<<span class="macro-nonterminal">$uty</span>>::from_bits(<span class="self">self</span>) + <<span class="macro-nonterminal">$uty</span>>::from_bits(mask)) - } - - <span class="attribute">#[inline] - </span><span class="kw">fn </span>cast_from_int(i: <span class="self">Self</span>::UInt) -> <span class="self">Self </span>{ - i.cast() - } - } - }; -} - -<span class="attribute">#[cfg(feature=<span class="string">"simd_support"</span>)] </span><span class="macro">simd_impl! </span>{ f32x2, f32, m32x2, u32x2 } -<span class="attribute">#[cfg(feature=<span class="string">"simd_support"</span>)] </span><span class="macro">simd_impl! </span>{ f32x4, f32, m32x4, u32x4 } -<span class="attribute">#[cfg(feature=<span class="string">"simd_support"</span>)] </span><span class="macro">simd_impl! </span>{ f32x8, f32, m32x8, u32x8 } -<span class="attribute">#[cfg(feature=<span class="string">"simd_support"</span>)] </span><span class="macro">simd_impl! </span>{ f32x16, f32, m32x16, u32x16 } -<span class="attribute">#[cfg(feature=<span class="string">"simd_support"</span>)] </span><span class="macro">simd_impl! </span>{ f64x2, f64, m64x2, u64x2 } -<span class="attribute">#[cfg(feature=<span class="string">"simd_support"</span>)] </span><span class="macro">simd_impl! </span>{ f64x4, f64, m64x4, u64x4 } -<span class="attribute">#[cfg(feature=<span class="string">"simd_support"</span>)] </span><span class="macro">simd_impl! </span>{ f64x8, f64, m64x8, u64x8 } -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/weighted.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/weighted.rs.html deleted file mode 100644 index 7ae8d0d..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/weighted.rs.html +++ /dev/null @@ -1,97 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/weighted.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>weighted.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../rand/index.html"> - <img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> -<span id="2">2</span> -<span id="3">3</span> -<span id="4">4</span> -<span id="5">5</span> -<span id="6">6</span> -<span id="7">7</span> -<span id="8">8</span> -<span id="9">9</span> -<span id="10">10</span> -<span id="11">11</span> -<span id="12">12</span> -<span id="13">13</span> -<span id="14">14</span> -<span id="15">15</span> -<span id="16">16</span> -<span id="17">17</span> -<span id="18">18</span> -<span id="19">19</span> -<span id="20">20</span> -<span id="21">21</span> -<span id="22">22</span> -<span id="23">23</span> -<span id="24">24</span> -<span id="25">25</span> -<span id="26">26</span> -<span id="27">27</span> -<span id="28">28</span> -<span id="29">29</span> -<span id="30">30</span> -<span id="31">31</span> -<span id="32">32</span> -<span id="33">33</span> -<span id="34">34</span> -<span id="35">35</span> -<span id="36">36</span> -<span id="37">37</span> -<span id="38">38</span> -<span id="39">39</span> -<span id="40">40</span> -<span id="41">41</span> -<span id="42">42</span> -<span id="43">43</span> -<span id="44">44</span> -<span id="45">45</span> -<span id="46">46</span> -<span id="47">47</span> -</pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! Weighted index sampling -//! -//! This module is deprecated. Use [`crate::distributions::WeightedIndex`] and -//! [`crate::distributions::WeightedError`] instead. - -</span><span class="kw">pub use super</span>::{WeightedIndex, WeightedError}; - -<span class="attribute">#[allow(missing_docs)] -#[deprecated(since = <span class="string">"0.8.0"</span>, note = <span class="string">"moved to rand_distr crate"</span>)] -</span><span class="kw">pub mod </span>alias_method { - <span class="comment">// This module exists to provide a deprecation warning which minimises - // compile errors, but still fails to compile if ever used. - </span><span class="kw">use </span>core::marker::PhantomData; - <span class="kw">use </span>alloc::vec::Vec; - <span class="kw">use </span><span class="kw">super</span>::WeightedError; - - <span class="attribute">#[derive(Debug)] - </span><span class="kw">pub struct </span>WeightedIndex<W: Weight> { - _phantom: PhantomData<W>, - } - <span class="kw">impl</span><W: Weight> WeightedIndex<W> { - <span class="kw">pub fn </span>new(_weights: Vec<W>) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, WeightedError> { - <span class="prelude-val">Err</span>(WeightedError::NoItem) - } - } - - <span class="kw">pub trait </span>Weight {} - <span class="macro">macro_rules! </span>impl_weight { - () => {}; - (<span class="macro-nonterminal">$T</span>:ident, $(<span class="macro-nonterminal">$more</span>:ident,)<span class="kw-2">*</span>) => { - <span class="kw">impl </span>Weight <span class="kw">for </span><span class="macro-nonterminal">$T </span>{} - <span class="macro">impl_weight!</span>($(<span class="macro-nonterminal">$more</span>,)<span class="kw-2">*</span>); - }; - } - <span class="macro">impl_weight!</span>(f64, f32,); - <span class="macro">impl_weight!</span>(u8, u16, u32, u64, usize,); - <span class="macro">impl_weight!</span>(i8, i16, i32, i64, isize,); - <span class="macro">impl_weight!</span>(u128, i128,); -} -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/weighted_index.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/weighted_index.rs.html deleted file mode 100644 index 7439a5b..0000000 --- a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand/distributions/weighted_index.rs.html +++ /dev/null @@ -1,919 +0,0 @@ -<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.8.5/src/distributions/weighted_index.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>weighted_index.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../rand/index.html"> - <img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> -<span id="2">2</span> -<span id="3">3</span> -<span id="4">4</span> -<span id="5">5</span> -<span id="6">6</span> -<span id="7">7</span> -<span id="8">8</span> -<span id="9">9</span> -<span id="10">10</span> -<span id="11">11</span> -<span id="12">12</span> -<span id="13">13</span> -<span id="14">14</span> -<span id="15">15</span> -<span id="16">16</span> -<span id="17">17</span> -<span id="18">18</span> -<span id="19">19</span> -<span id="20">20</span> -<span id="21">21</span> -<span id="22">22</span> -<span id="23">23</span> -<span id="24">24</span> -<span id="25">25</span> -<span id="26">26</span> -<span id="27">27</span> -<span id="28">28</span> -<span id="29">29</span> -<span id="30">30</span> -<span id="31">31</span> 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This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! Weighted index sampling - -</span><span class="kw">use </span><span class="kw">crate</span>::distributions::uniform::{SampleBorrow, SampleUniform, UniformSampler}; -<span class="kw">use </span><span class="kw">crate</span>::distributions::Distribution; -<span class="kw">use </span><span class="kw">crate</span>::Rng; -<span class="kw">use </span>core::cmp::PartialOrd; -<span class="kw">use </span>core::fmt; - -<span class="comment">// Note that this whole module is only imported if feature="alloc" is enabled. -</span><span class="kw">use </span>alloc::vec::Vec; - -<span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] -</span><span class="kw">use </span>serde::{Serialize, Deserialize}; - -<span class="doccomment">/// A distribution using weighted sampling of discrete items -/// -/// Sampling a `WeightedIndex` distribution returns the index of a randomly -/// selected element from the iterator used when the `WeightedIndex` was -/// created. The chance of a given element being picked is proportional to the -/// value of the element. The weights can use any type `X` for which an -/// implementation of [`Uniform<X>`] exists. -/// -/// # Performance -/// -/// Time complexity of sampling from `WeightedIndex` is `O(log N)` where -/// `N` is the number of weights. As an alternative, -/// [`rand_distr::weighted_alias`](https://docs.rs/rand_distr/*/rand_distr/weighted_alias/index.html) -/// supports `O(1)` sampling, but with much higher initialisation cost. -/// -/// A `WeightedIndex<X>` contains a `Vec<X>` and a [`Uniform<X>`] and so its -/// size is the sum of the size of those objects, possibly plus some alignment. -/// -/// Creating a `WeightedIndex<X>` will allocate enough space to hold `N - 1` -/// weights of type `X`, where `N` is the number of weights. However, since -/// `Vec` doesn't guarantee a particular growth strategy, additional memory -/// might be allocated but not used. Since the `WeightedIndex` object also -/// contains, this might cause additional allocations, though for primitive -/// types, [`Uniform<X>`] doesn't allocate any memory. -/// -/// Sampling from `WeightedIndex` will result in a single call to -/// `Uniform<X>::sample` (method of the [`Distribution`] trait), which typically -/// will request a single value from the underlying [`RngCore`], though the -/// exact number depends on the implementation of `Uniform<X>::sample`. -/// -/// # Example -/// -/// ``` -/// use rand::prelude::*; -/// use rand::distributions::WeightedIndex; -/// -/// let choices = ['a', 'b', 'c']; -/// let weights = [2, 1, 1]; -/// let dist = WeightedIndex::new(&weights).unwrap(); -/// let mut rng = thread_rng(); -/// for _ in 0..100 { -/// // 50% chance to print 'a', 25% chance to print 'b', 25% chance to print 'c' -/// println!("{}", choices[dist.sample(&mut rng)]); -/// } -/// -/// let items = [('a', 0), ('b', 3), ('c', 7)]; -/// let dist2 = WeightedIndex::new(items.iter().map(|item| item.1)).unwrap(); -/// for _ in 0..100 { -/// // 0% chance to print 'a', 30% chance to print 'b', 70% chance to print 'c' -/// println!("{}", items[dist2.sample(&mut rng)].0); -/// } -/// ``` -/// -/// [`Uniform<X>`]: crate::distributions::Uniform -/// [`RngCore`]: crate::RngCore -</span><span class="attribute">#[derive(Debug, Clone, PartialEq)] -#[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] -#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"alloc"</span>)))] -</span><span class="kw">pub struct </span>WeightedIndex<X: SampleUniform + PartialOrd> { - cumulative_weights: Vec<X>, - total_weight: X, - weight_distribution: X::Sampler, -} - -<span class="kw">impl</span><X: SampleUniform + PartialOrd> WeightedIndex<X> { - <span class="doccomment">/// Creates a new a `WeightedIndex` [`Distribution`] using the values - /// in `weights`. The weights can use any type `X` for which an - /// implementation of [`Uniform<X>`] exists. - /// - /// Returns an error if the iterator is empty, if any weight is `< 0`, or - /// if its total value is 0. - /// - /// [`Uniform<X>`]: crate::distributions::uniform::Uniform - </span><span class="kw">pub fn </span>new<I>(weights: I) -> <span class="prelude-ty">Result</span><WeightedIndex<X>, WeightedError> - <span class="kw">where - </span>I: IntoIterator, - I::Item: SampleBorrow<X>, - X: <span class="kw">for</span><<span class="lifetime">'a</span>> ::core::ops::AddAssign<<span class="kw-2">&</span><span class="lifetime">'a </span>X> + Clone + Default, - { - <span class="kw">let </span><span class="kw-2">mut </span>iter = weights.into_iter(); - <span class="kw">let </span><span class="kw-2">mut </span>total_weight: X = iter.next().ok_or(WeightedError::NoItem)<span class="question-mark">?</span>.borrow().clone(); - - <span class="kw">let </span>zero = <X <span class="kw">as </span>Default>::default(); - <span class="kw">if </span>!(total_weight >= zero) { - <span class="kw">return </span><span class="prelude-val">Err</span>(WeightedError::InvalidWeight); - } - - <span class="kw">let </span><span class="kw-2">mut </span>weights = Vec::<X>::with_capacity(iter.size_hint().<span class="number">0</span>); - <span class="kw">for </span>w <span class="kw">in </span>iter { - <span class="comment">// Note that `!(w >= x)` is not equivalent to `w < x` for partially - // ordered types due to NaNs which are equal to nothing. - </span><span class="kw">if </span>!(w.borrow() >= <span class="kw-2">&</span>zero) { - <span class="kw">return </span><span class="prelude-val">Err</span>(WeightedError::InvalidWeight); - } - weights.push(total_weight.clone()); - total_weight += w.borrow(); - } - - <span class="kw">if </span>total_weight == zero { - <span class="kw">return </span><span class="prelude-val">Err</span>(WeightedError::AllWeightsZero); - } - <span class="kw">let </span>distr = X::Sampler::new(zero, total_weight.clone()); - - <span class="prelude-val">Ok</span>(WeightedIndex { - cumulative_weights: weights, - total_weight, - weight_distribution: distr, - }) - } - - <span class="doccomment">/// Update a subset of weights, without changing the number of weights. - /// - /// `new_weights` must be sorted by the index. - /// - /// Using this method instead of `new` might be more efficient if only a small number of - /// weights is modified. No allocations are performed, unless the weight type `X` uses - /// allocation internally. - /// - /// In case of error, `self` is not modified. - </span><span class="kw">pub fn </span>update_weights(<span class="kw-2">&mut </span><span class="self">self</span>, new_weights: <span class="kw-2">&</span>[(usize, <span class="kw-2">&</span>X)]) -> <span class="prelude-ty">Result</span><(), WeightedError> - <span class="kw">where </span>X: <span class="kw">for</span><<span class="lifetime">'a</span>> ::core::ops::AddAssign<<span class="kw-2">&</span><span class="lifetime">'a </span>X> - + <span class="kw">for</span><<span class="lifetime">'a</span>> ::core::ops::SubAssign<<span class="kw-2">&</span><span class="lifetime">'a </span>X> - + Clone - + Default { - <span class="kw">if </span>new_weights.is_empty() { - <span class="kw">return </span><span class="prelude-val">Ok</span>(()); - } - - <span class="kw">let </span>zero = <X <span class="kw">as </span>Default>::default(); - - <span class="kw">let </span><span class="kw-2">mut </span>total_weight = <span class="self">self</span>.total_weight.clone(); - - <span class="comment">// Check for errors first, so we don't modify `self` in case something - // goes wrong. - </span><span class="kw">let </span><span class="kw-2">mut </span>prev_i = <span class="prelude-val">None</span>; - <span class="kw">for </span><span class="kw-2">&</span>(i, w) <span class="kw">in </span>new_weights { - <span class="kw">if let </span><span class="prelude-val">Some</span>(old_i) = prev_i { - <span class="kw">if </span>old_i >= i { - <span class="kw">return </span><span class="prelude-val">Err</span>(WeightedError::InvalidWeight); - } - } - <span class="kw">if </span>!(<span class="kw-2">*</span>w >= zero) { - <span class="kw">return </span><span class="prelude-val">Err</span>(WeightedError::InvalidWeight); - } - <span class="kw">if </span>i > <span class="self">self</span>.cumulative_weights.len() { - <span class="kw">return </span><span class="prelude-val">Err</span>(WeightedError::TooMany); - } - - <span class="kw">let </span><span class="kw-2">mut </span>old_w = <span class="kw">if </span>i < <span class="self">self</span>.cumulative_weights.len() { - <span class="self">self</span>.cumulative_weights[i].clone() - } <span class="kw">else </span>{ - <span class="self">self</span>.total_weight.clone() - }; - <span class="kw">if </span>i > <span class="number">0 </span>{ - old_w -= <span class="kw-2">&</span><span class="self">self</span>.cumulative_weights[i - <span class="number">1</span>]; - } - - total_weight -= <span class="kw-2">&</span>old_w; - total_weight += w; - prev_i = <span class="prelude-val">Some</span>(i); - } - <span class="kw">if </span>total_weight <= zero { - <span class="kw">return </span><span class="prelude-val">Err</span>(WeightedError::AllWeightsZero); - } - - <span class="comment">// Update the weights. Because we checked all the preconditions in the - // previous loop, this should never panic. - </span><span class="kw">let </span><span class="kw-2">mut </span>iter = new_weights.iter(); - - <span class="kw">let </span><span class="kw-2">mut </span>prev_weight = zero.clone(); - <span class="kw">let </span><span class="kw-2">mut </span>next_new_weight = iter.next(); - <span class="kw">let </span><span class="kw-2">&</span>(first_new_index, <span class="kw">_</span>) = next_new_weight.unwrap(); - <span class="kw">let </span><span class="kw-2">mut </span>cumulative_weight = <span class="kw">if </span>first_new_index > <span class="number">0 </span>{ - <span class="self">self</span>.cumulative_weights[first_new_index - <span class="number">1</span>].clone() - } <span class="kw">else </span>{ - zero.clone() - }; - <span class="kw">for </span>i <span class="kw">in </span>first_new_index..<span class="self">self</span>.cumulative_weights.len() { - <span class="kw">match </span>next_new_weight { - <span class="prelude-val">Some</span>(<span class="kw-2">&</span>(j, w)) <span class="kw">if </span>i == j => { - cumulative_weight += w; - next_new_weight = iter.next(); - } - <span class="kw">_ </span>=> { - <span class="kw">let </span><span class="kw-2">mut </span>tmp = <span class="self">self</span>.cumulative_weights[i].clone(); - tmp -= <span class="kw-2">&</span>prev_weight; <span class="comment">// We know this is positive. - </span>cumulative_weight += <span class="kw-2">&</span>tmp; - } - } - prev_weight = cumulative_weight.clone(); - core::mem::swap(<span class="kw-2">&mut </span>prev_weight, <span class="kw-2">&mut </span><span class="self">self</span>.cumulative_weights[i]); - } - - <span class="self">self</span>.total_weight = total_weight; - <span class="self">self</span>.weight_distribution = X::Sampler::new(zero, <span class="self">self</span>.total_weight.clone()); - - <span class="prelude-val">Ok</span>(()) - } -} - -<span class="kw">impl</span><X> Distribution<usize> <span class="kw">for </span>WeightedIndex<X> -<span class="kw">where </span>X: SampleUniform + PartialOrd -{ - <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> usize { - <span class="kw">use </span>::core::cmp::Ordering; - <span class="kw">let </span>chosen_weight = <span class="self">self</span>.weight_distribution.sample(rng); - <span class="comment">// Find the first item which has a weight *higher* than the chosen weight. - </span><span class="self">self</span>.cumulative_weights - .binary_search_by(|w| { - <span class="kw">if </span><span class="kw-2">*</span>w <= chosen_weight { - Ordering::Less - } <span class="kw">else </span>{ - Ordering::Greater - } - }) - .unwrap_err() - } -} - -<span class="attribute">#[cfg(test)] -</span><span class="kw">mod </span>test { - <span class="kw">use super</span>::<span class="kw-2">*</span>; - - <span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] - #[test] - </span><span class="kw">fn </span>test_weightedindex_serde1() { - <span class="kw">let </span>weighted_index = WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>]).unwrap(); - - <span class="kw">let </span>ser_weighted_index = bincode::serialize(<span class="kw-2">&</span>weighted_index).unwrap(); - <span class="kw">let </span>de_weighted_index: WeightedIndex<i32> = - bincode::deserialize(<span class="kw-2">&</span>ser_weighted_index).unwrap(); - - <span class="macro">assert_eq!</span>( - de_weighted_index.cumulative_weights, - weighted_index.cumulative_weights - ); - <span class="macro">assert_eq!</span>(de_weighted_index.total_weight, weighted_index.total_weight); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_accepting_nan(){ - <span class="macro">assert_eq!</span>( - WeightedIndex::new(<span class="kw-2">&</span>[core::f32::NAN, <span class="number">0.5</span>]).unwrap_err(), - WeightedError::InvalidWeight, - ); - <span class="macro">assert_eq!</span>( - WeightedIndex::new(<span class="kw-2">&</span>[core::f32::NAN]).unwrap_err(), - WeightedError::InvalidWeight, - ); - <span class="macro">assert_eq!</span>( - WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">0.5</span>, core::f32::NAN]).unwrap_err(), - WeightedError::InvalidWeight, - ); - - <span class="macro">assert_eq!</span>( - WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">0.5</span>, <span class="number">7.0</span>]) - .unwrap() - .update_weights(<span class="kw-2">&</span>[(<span class="number">0</span>, <span class="kw-2">&</span>core::f32::NAN)]) - .unwrap_err(), - WeightedError::InvalidWeight, - ) - } - - - <span class="attribute">#[test] - #[cfg_attr(miri, ignore)] </span><span class="comment">// Miri is too slow - </span><span class="kw">fn </span>test_weightedindex() { - <span class="kw">let </span><span class="kw-2">mut </span>r = <span class="kw">crate</span>::test::rng(<span class="number">700</span>); - <span class="kw">const </span>N_REPS: u32 = <span class="number">5000</span>; - <span class="kw">let </span>weights = [<span class="number">1u32</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>]; - <span class="kw">let </span>total_weight = weights.iter().sum::<u32>() <span class="kw">as </span>f32; - - <span class="kw">let </span>verify = |result: [i32; <span class="number">14</span>]| { - <span class="kw">for </span>(i, count) <span class="kw">in </span>result.iter().enumerate() { - <span class="kw">let </span>exp = (weights[i] * N_REPS) <span class="kw">as </span>f32 / total_weight; - <span class="kw">let </span><span class="kw-2">mut </span>err = (<span class="kw-2">*</span>count <span class="kw">as </span>f32 - exp).abs(); - <span class="kw">if </span>err != <span class="number">0.0 </span>{ - err /= exp; - } - <span class="macro">assert!</span>(err <= <span class="number">0.25</span>); - } - }; - - <span class="comment">// WeightedIndex from vec - </span><span class="kw">let </span><span class="kw-2">mut </span>chosen = [<span class="number">0i32</span>; <span class="number">14</span>]; - <span class="kw">let </span>distr = WeightedIndex::new(weights.to_vec()).unwrap(); - <span class="kw">for _ in </span><span class="number">0</span>..N_REPS { - chosen[distr.sample(<span class="kw-2">&mut </span>r)] += <span class="number">1</span>; - } - verify(chosen); - - <span class="comment">// WeightedIndex from slice - </span>chosen = [<span class="number">0i32</span>; <span class="number">14</span>]; - <span class="kw">let </span>distr = WeightedIndex::new(<span class="kw-2">&</span>weights[..]).unwrap(); - <span class="kw">for _ in </span><span class="number">0</span>..N_REPS { - chosen[distr.sample(<span class="kw-2">&mut </span>r)] += <span class="number">1</span>; - } - verify(chosen); - - <span class="comment">// WeightedIndex from iterator - </span>chosen = [<span class="number">0i32</span>; <span class="number">14</span>]; - <span class="kw">let </span>distr = WeightedIndex::new(weights.iter()).unwrap(); - <span class="kw">for _ in </span><span class="number">0</span>..N_REPS { - chosen[distr.sample(<span class="kw-2">&mut </span>r)] += <span class="number">1</span>; - } - verify(chosen); - - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">5 </span>{ - <span class="macro">assert_eq!</span>(WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>]).unwrap().sample(<span class="kw-2">&mut </span>r), <span class="number">1</span>); - <span class="macro">assert_eq!</span>(WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">0</span>]).unwrap().sample(<span class="kw-2">&mut </span>r), <span class="number">0</span>); - <span class="macro">assert_eq!</span>( - WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">10</span>, <span class="number">0</span>]) - .unwrap() - .sample(<span class="kw-2">&mut </span>r), - <span class="number">4 - </span>); - } - - <span class="macro">assert_eq!</span>( - WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">10</span>][<span class="number">0</span>..<span class="number">0</span>]).unwrap_err(), - WeightedError::NoItem - ); - <span class="macro">assert_eq!</span>( - WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">0</span>]).unwrap_err(), - WeightedError::AllWeightsZero - ); - <span class="macro">assert_eq!</span>( - WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">10</span>, <span class="number">20</span>, -<span class="number">1</span>, <span class="number">30</span>]).unwrap_err(), - WeightedError::InvalidWeight - ); - <span class="macro">assert_eq!</span>( - WeightedIndex::new(<span class="kw-2">&</span>[-<span class="number">10</span>, <span class="number">20</span>, <span class="number">1</span>, <span class="number">30</span>]).unwrap_err(), - WeightedError::InvalidWeight - ); - <span class="macro">assert_eq!</span>( - WeightedIndex::new(<span class="kw-2">&</span>[-<span class="number">10</span>]).unwrap_err(), - WeightedError::InvalidWeight - ); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_update_weights() { - <span class="kw">let </span>data = [ - ( - <span class="kw-2">&</span>[<span class="number">10u32</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>][..], - <span class="kw-2">&</span>[(<span class="number">1</span>, <span class="kw-2">&</span><span class="number">100</span>), (<span class="number">2</span>, <span class="kw-2">&</span><span class="number">4</span>)][..], <span class="comment">// positive change - </span><span class="kw-2">&</span>[<span class="number">10</span>, <span class="number">100</span>, <span class="number">4</span>, <span class="number">4</span>][..], - ), - ( - <span class="kw-2">&</span>[<span class="number">1u32</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>][..], - <span class="kw-2">&</span>[(<span class="number">2</span>, <span class="kw-2">&</span><span class="number">1</span>), (<span class="number">5</span>, <span class="kw-2">&</span><span class="number">1</span>), (<span class="number">13</span>, <span class="kw-2">&</span><span class="number">100</span>)][..], <span class="comment">// negative change and last element - </span><span class="kw-2">&</span>[<span class="number">1u32</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">1</span>, <span class="number">7</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">100</span>][..], - ), - ]; - - <span class="kw">for </span>(weights, update, expected_weights) <span class="kw">in </span>data.iter() { - <span class="kw">let </span>total_weight = weights.iter().sum::<u32>(); - <span class="kw">let </span><span class="kw-2">mut </span>distr = WeightedIndex::new(weights.to_vec()).unwrap(); - <span class="macro">assert_eq!</span>(distr.total_weight, total_weight); - - distr.update_weights(update).unwrap(); - <span class="kw">let </span>expected_total_weight = expected_weights.iter().sum::<u32>(); - <span class="kw">let </span>expected_distr = WeightedIndex::new(expected_weights.to_vec()).unwrap(); - <span class="macro">assert_eq!</span>(distr.total_weight, expected_total_weight); - <span class="macro">assert_eq!</span>(distr.total_weight, expected_distr.total_weight); - <span class="macro">assert_eq!</span>(distr.cumulative_weights, expected_distr.cumulative_weights); - } - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>value_stability() { - <span class="kw">fn </span>test_samples<X: SampleUniform + PartialOrd, I>( - weights: I, buf: <span class="kw-2">&mut </span>[usize], expected: <span class="kw-2">&</span>[usize], - ) <span class="kw">where - </span>I: IntoIterator, - I::Item: SampleBorrow<X>, - X: <span class="kw">for</span><<span class="lifetime">'a</span>> ::core::ops::AddAssign<<span class="kw-2">&</span><span class="lifetime">'a </span>X> + Clone + Default, - { - <span class="macro">assert_eq!</span>(buf.len(), expected.len()); - <span class="kw">let </span>distr = WeightedIndex::new(weights).unwrap(); - <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">701</span>); - <span class="kw">for </span>r <span class="kw">in </span>buf.iter_mut() { - <span class="kw-2">*</span>r = rng.sample(<span class="kw-2">&</span>distr); - } - <span class="macro">assert_eq!</span>(buf, expected); - } - - <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">10</span>]; - test_samples(<span class="kw-2">&</span>[<span class="number">1i32</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>], <span class="kw-2">&mut </span>buf, <span class="kw-2">&</span>[ - <span class="number">0</span>, <span class="number">6</span>, <span class="number">2</span>, <span class="number">6</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">2</span>, <span class="number">5</span>, - ]); - test_samples(<span class="kw-2">&</span>[<span class="number">0.7f32</span>, <span class="number">0.1</span>, <span class="number">0.1</span>, <span class="number">0.1</span>], <span class="kw-2">&mut </span>buf, <span class="kw-2">&</span>[ - <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>, - ]); - test_samples(<span class="kw-2">&</span>[<span class="number">1.0f64</span>, <span class="number">0.999</span>, <span class="number">0.998</span>, <span class="number">0.997</span>], <span class="kw-2">&mut </span>buf, <span class="kw-2">&</span>[ - <span class="number">2</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">3</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>, - ]); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>weighted_index_distributions_can_be_compared() { - <span class="macro">assert_eq!</span>(WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>]), WeightedIndex::new(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>])); - } -} - -<span class="doccomment">/// Error type returned from `WeightedIndex::new`. -</span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"alloc"</span>)))] -#[derive(Debug, Clone, Copy, PartialEq, Eq)] -</span><span class="kw">pub enum </span>WeightedError { - <span class="doccomment">/// The provided weight collection contains no items. - </span>NoItem, - - <span class="doccomment">/// A weight is either less than zero, greater than the supported maximum, - /// NaN, or otherwise invalid. - </span>InvalidWeight, - - <span class="doccomment">/// All items in the provided weight collection are zero. - </span>AllWeightsZero, - - <span class="doccomment">/// Too many weights are provided (length greater than `u32::MAX`) - </span>TooMany, -} - -<span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] -</span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>WeightedError {} - -<span class="kw">impl </span>fmt::Display <span class="kw">for </span>WeightedError { - <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { - f.write_str(<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ - WeightedError::NoItem => <span class="string">"No weights provided in distribution"</span>, - WeightedError::InvalidWeight => <span class="string">"A weight is invalid in distribution"</span>, - WeightedError::AllWeightsZero => <span class="string">"All weights are zero in distribution"</span>, - WeightedError::TooMany => <span class="string">"Too many weights (hit u32::MAX) in distribution"</span>, - }) - } -} -</code></pre></div> -</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
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