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id="599">599</span> -<span id="600">600</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">//! [`Rng`] trait - -</span><span class="kw">use </span>rand_core::{Error, RngCore}; -<span class="kw">use </span><span class="kw">crate</span>::distributions::uniform::{SampleRange, SampleUniform}; -<span class="kw">use </span><span class="kw">crate</span>::distributions::{<span class="self">self</span>, Distribution, Standard}; -<span class="kw">use </span>core::num::Wrapping; -<span class="kw">use </span>core::{mem, slice}; - -<span class="doccomment">/// An automatically-implemented extension trait on [`RngCore`] providing high-level -/// generic methods for sampling values and other convenience methods. -/// -/// This is the primary trait to use when generating random values. -/// -/// # Generic usage -/// -/// The basic pattern is `fn foo<R: Rng + ?Sized>(rng: &mut R)`. Some -/// things are worth noting here: -/// -/// - Since `Rng: RngCore` and every `RngCore` implements `Rng`, it makes no -/// difference whether we use `R: Rng` or `R: RngCore`. -/// - The `+ ?Sized` un-bounding allows functions to be called directly on -/// type-erased references; i.e. `foo(r)` where `r: &mut dyn RngCore`. Without -/// this it would be necessary to write `foo(&mut r)`. -/// -/// An alternative pattern is possible: `fn foo<R: Rng>(rng: R)`. This has some -/// trade-offs. It allows the argument to be consumed directly without a `&mut` -/// (which is how `from_rng(thread_rng())` works); also it still works directly -/// on references (including type-erased references). Unfortunately within the -/// function `foo` it is not known whether `rng` is a reference type or not, -/// hence many uses of `rng` require an extra reference, either explicitly -/// (`distr.sample(&mut rng)`) or implicitly (`rng.gen()`); one may hope the -/// optimiser can remove redundant references later. -/// -/// Example: -/// -/// ``` -/// # use rand::thread_rng; -/// use rand::Rng; -/// -/// fn foo<R: Rng + ?Sized>(rng: &mut R) -> f32 { -/// rng.gen() -/// } -/// -/// # let v = foo(&mut thread_rng()); -/// ``` -</span><span class="kw">pub trait </span>Rng: RngCore { - <span class="doccomment">/// Return a random value supporting the [`Standard`] distribution. - /// - /// # Example - /// - /// ``` - /// use rand::{thread_rng, Rng}; - /// - /// let mut rng = thread_rng(); - /// let x: u32 = rng.gen(); - /// println!("{}", x); - /// println!("{:?}", rng.gen::<(f64, bool)>()); - /// ``` - /// - /// # Arrays and tuples - /// - /// The `rng.gen()` method is able to generate arrays (up to 32 elements) - /// and tuples (up to 12 elements), so long as all element types can be - /// generated. - /// When using `rustc` ≥ 1.51, enable the `min_const_gen` feature to support - /// arrays larger than 32 elements. - /// - /// For arrays of integers, especially for those with small element types - /// (< 64 bit), it will likely be faster to instead use [`Rng::fill`]. - /// - /// ``` - /// use rand::{thread_rng, Rng}; - /// - /// let mut rng = thread_rng(); - /// let tuple: (u8, i32, char) = rng.gen(); // arbitrary tuple support - /// - /// let arr1: [f32; 32] = rng.gen(); // array construction - /// let mut arr2 = [0u8; 128]; - /// rng.fill(&mut arr2); // array fill - /// ``` - /// - /// [`Standard`]: distributions::Standard - </span><span class="attribute">#[inline] - </span><span class="kw">fn </span>gen<T>(<span class="kw-2">&mut </span><span class="self">self</span>) -> T - <span class="kw">where </span>Standard: Distribution<T> { - Standard.sample(<span class="self">self</span>) - } - - <span class="doccomment">/// Generate a random value in the given range. - /// - /// This function is optimised for the case that only a single sample is - /// made from the given range. See also the [`Uniform`] distribution - /// type which may be faster if sampling from the same range repeatedly. - /// - /// Only `gen_range(low..high)` and `gen_range(low..=high)` are supported. - /// - /// # Panics - /// - /// Panics if the range is empty. - /// - /// # Example - /// - /// ``` - /// use rand::{thread_rng, Rng}; - /// - /// let mut rng = thread_rng(); - /// - /// // Exclusive range - /// let n: u32 = rng.gen_range(0..10); - /// println!("{}", n); - /// let m: f64 = rng.gen_range(-40.0..1.3e5); - /// println!("{}", m); - /// - /// // Inclusive range - /// let n: u32 = rng.gen_range(0..=10); - /// println!("{}", n); - /// ``` - /// - /// [`Uniform`]: distributions::uniform::Uniform - </span><span class="kw">fn </span>gen_range<T, R>(<span class="kw-2">&mut </span><span class="self">self</span>, range: R) -> T - <span class="kw">where - </span>T: SampleUniform, - R: SampleRange<T> - { - <span class="macro">assert!</span>(!range.is_empty(), <span class="string">"cannot sample empty range"</span>); - range.sample_single(<span class="self">self</span>) - } - - <span class="doccomment">/// Sample a new value, using the given distribution. - /// - /// ### Example - /// - /// ``` - /// use rand::{thread_rng, Rng}; - /// use rand::distributions::Uniform; - /// - /// let mut rng = thread_rng(); - /// let x = rng.sample(Uniform::new(10u32, 15)); - /// // Type annotation requires two types, the type and distribution; the - /// // distribution can be inferred. - /// let y = rng.sample::<u16, _>(Uniform::new(10, 15)); - /// ``` - </span><span class="kw">fn </span>sample<T, D: Distribution<T>>(<span class="kw-2">&mut </span><span class="self">self</span>, distr: D) -> T { - distr.sample(<span class="self">self</span>) - } - - <span class="doccomment">/// Create an iterator that generates values using the given distribution. - /// - /// Note that this function takes its arguments by value. This works since - /// `(&mut R): Rng where R: Rng` and - /// `(&D): Distribution where D: Distribution`, - /// however borrowing is not automatic hence `rng.sample_iter(...)` may - /// need to be replaced with `(&mut rng).sample_iter(...)`. - /// - /// # Example - /// - /// ``` - /// use rand::{thread_rng, Rng}; - /// use rand::distributions::{Alphanumeric, Uniform, Standard}; - /// - /// let mut rng = thread_rng(); - /// - /// // Vec of 16 x f32: - /// let v: Vec<f32> = (&mut rng).sample_iter(Standard).take(16).collect(); - /// - /// // String: - /// let s: String = (&mut rng).sample_iter(Alphanumeric) - /// .take(7) - /// .map(char::from) - /// .collect(); - /// - /// // Combined values - /// println!("{:?}", (&mut rng).sample_iter(Standard).take(5) - /// .collect::<Vec<(f64, bool)>>()); - /// - /// // Dice-rolling: - /// let die_range = Uniform::new_inclusive(1, 6); - /// let mut roll_die = (&mut rng).sample_iter(die_range); - /// while roll_die.next().unwrap() != 6 { - /// println!("Not a 6; rolling again!"); - /// } - /// ``` - </span><span class="kw">fn </span>sample_iter<T, D>(<span class="self">self</span>, distr: D) -> distributions::DistIter<D, <span class="self">Self</span>, T> - <span class="kw">where - </span>D: Distribution<T>, - <span class="self">Self</span>: Sized, - { - distr.sample_iter(<span class="self">self</span>) - } - - <span class="doccomment">/// Fill any type implementing [`Fill`] with random data - /// - /// The distribution is expected to be uniform with portable results, but - /// this cannot be guaranteed for third-party implementations. - /// - /// This is identical to [`try_fill`] except that it panics on error. - /// - /// # Example - /// - /// ``` - /// use rand::{thread_rng, Rng}; - /// - /// let mut arr = [0i8; 20]; - /// thread_rng().fill(&mut arr[..]); - /// ``` - /// - /// [`fill_bytes`]: RngCore::fill_bytes - /// [`try_fill`]: Rng::try_fill - </span><span class="kw">fn </span>fill<T: Fill + <span class="question-mark">?</span>Sized>(<span class="kw-2">&mut </span><span class="self">self</span>, dest: <span class="kw-2">&mut </span>T) { - dest.try_fill(<span class="self">self</span>).unwrap_or_else(|<span class="kw">_</span>| <span class="macro">panic!</span>(<span class="string">"Rng::fill failed"</span>)) - } - - <span class="doccomment">/// Fill any type implementing [`Fill`] with random data - /// - /// The distribution is expected to be uniform with portable results, but - /// this cannot be guaranteed for third-party implementations. - /// - /// This is identical to [`fill`] except that it forwards errors. - /// - /// # Example - /// - /// ``` - /// # use rand::Error; - /// use rand::{thread_rng, Rng}; - /// - /// # fn try_inner() -> Result<(), Error> { - /// let mut arr = [0u64; 4]; - /// thread_rng().try_fill(&mut arr[..])?; - /// # Ok(()) - /// # } - /// - /// # try_inner().unwrap() - /// ``` - /// - /// [`try_fill_bytes`]: RngCore::try_fill_bytes - /// [`fill`]: Rng::fill - </span><span class="kw">fn </span>try_fill<T: Fill + <span class="question-mark">?</span>Sized>(<span class="kw-2">&mut </span><span class="self">self</span>, dest: <span class="kw-2">&mut </span>T) -> <span class="prelude-ty">Result</span><(), Error> { - dest.try_fill(<span class="self">self</span>) - } - - <span class="doccomment">/// Return a bool with a probability `p` of being true. - /// - /// See also the [`Bernoulli`] distribution, which may be faster if - /// sampling from the same probability repeatedly. - /// - /// # Example - /// - /// ``` - /// use rand::{thread_rng, Rng}; - /// - /// let mut rng = thread_rng(); - /// println!("{}", rng.gen_bool(1.0 / 3.0)); - /// ``` - /// - /// # Panics - /// - /// If `p < 0` or `p > 1`. - /// - /// [`Bernoulli`]: distributions::Bernoulli - </span><span class="attribute">#[inline] - </span><span class="kw">fn </span>gen_bool(<span class="kw-2">&mut </span><span class="self">self</span>, p: f64) -> bool { - <span class="kw">let </span>d = distributions::Bernoulli::new(p).unwrap(); - <span class="self">self</span>.sample(d) - } - - <span class="doccomment">/// Return a bool with a probability of `numerator/denominator` of being - /// true. I.e. `gen_ratio(2, 3)` has chance of 2 in 3, or about 67%, of - /// returning true. If `numerator == denominator`, then the returned value - /// is guaranteed to be `true`. If `numerator == 0`, then the returned - /// value is guaranteed to be `false`. - /// - /// See also the [`Bernoulli`] distribution, which may be faster if - /// sampling from the same `numerator` and `denominator` repeatedly. - /// - /// # Panics - /// - /// If `denominator == 0` or `numerator > denominator`. - /// - /// # Example - /// - /// ``` - /// use rand::{thread_rng, Rng}; - /// - /// let mut rng = thread_rng(); - /// println!("{}", rng.gen_ratio(2, 3)); - /// ``` - /// - /// [`Bernoulli`]: distributions::Bernoulli - </span><span class="attribute">#[inline] - </span><span class="kw">fn </span>gen_ratio(<span class="kw-2">&mut </span><span class="self">self</span>, numerator: u32, denominator: u32) -> bool { - <span class="kw">let </span>d = distributions::Bernoulli::from_ratio(numerator, denominator).unwrap(); - <span class="self">self</span>.sample(d) - } -} - -<span class="kw">impl</span><R: RngCore + <span class="question-mark">?</span>Sized> Rng <span class="kw">for </span>R {} - -<span class="doccomment">/// Types which may be filled with random data -/// -/// This trait allows arrays to be efficiently filled with random data. -/// -/// Implementations are expected to be portable across machines unless -/// clearly documented otherwise (see the -/// [Chapter on Portability](https://rust-random.github.io/book/portability.html)). -</span><span class="kw">pub trait </span>Fill { - <span class="doccomment">/// Fill self with random data - </span><span class="kw">fn </span>try_fill<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&mut </span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="prelude-ty">Result</span><(), Error>; -} - -<span class="macro">macro_rules! </span>impl_fill_each { - () => {}; - (<span class="macro-nonterminal">$t</span>:ty) => { - <span class="kw">impl </span>Fill <span class="kw">for </span>[<span class="macro-nonterminal">$t</span>] { - <span class="kw">fn </span>try_fill<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&mut </span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="prelude-ty">Result</span><(), Error> { - <span class="kw">for </span>elt <span class="kw">in </span><span class="self">self</span>.iter_mut() { - <span class="kw-2">*</span>elt = rng.gen(); - } - <span class="prelude-val">Ok</span>(()) - } - } - }; - (<span class="macro-nonterminal">$t</span>:ty, $(<span class="macro-nonterminal">$tt</span>:ty,)<span class="kw-2">*</span>) => { - <span class="macro">impl_fill_each!</span>(<span class="macro-nonterminal">$t</span>); - <span class="macro">impl_fill_each!</span>($(<span class="macro-nonterminal">$tt</span>,)<span class="kw-2">*</span>); - }; -} - -<span class="macro">impl_fill_each!</span>(bool, char, f32, f64,); - -<span class="kw">impl </span>Fill <span class="kw">for </span>[u8] { - <span class="kw">fn </span>try_fill<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&mut </span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="prelude-ty">Result</span><(), Error> { - rng.try_fill_bytes(<span class="self">self</span>) - } -} - -<span class="macro">macro_rules! </span>impl_fill { - () => {}; - (<span class="macro-nonterminal">$t</span>:ty) => { - <span class="kw">impl </span>Fill <span class="kw">for </span>[<span class="macro-nonterminal">$t</span>] { - <span class="attribute">#[inline(never)] </span><span class="comment">// in micro benchmarks, this improves performance - </span><span class="kw">fn </span>try_fill<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&mut </span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="prelude-ty">Result</span><(), Error> { - <span class="kw">if </span><span class="self">self</span>.len() > <span class="number">0 </span>{ - rng.try_fill_bytes(<span class="kw">unsafe </span>{ - slice::from_raw_parts_mut(<span class="self">self</span>.as_mut_ptr() - <span class="kw">as </span><span class="kw-2">*mut </span>u8, - <span class="self">self</span>.len() * mem::size_of::<<span class="macro-nonterminal">$t</span>>() - ) - })<span class="question-mark">?</span>; - <span class="kw">for </span>x <span class="kw">in </span><span class="self">self </span>{ - <span class="kw-2">*</span>x = x.to_le(); - } - } - <span class="prelude-val">Ok</span>(()) - } - } - - <span class="kw">impl </span>Fill <span class="kw">for </span>[Wrapping<<span class="macro-nonterminal">$t</span>>] { - <span class="attribute">#[inline(never)] - </span><span class="kw">fn </span>try_fill<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&mut </span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="prelude-ty">Result</span><(), Error> { - <span class="kw">if </span><span class="self">self</span>.len() > <span class="number">0 </span>{ - rng.try_fill_bytes(<span class="kw">unsafe </span>{ - slice::from_raw_parts_mut(<span class="self">self</span>.as_mut_ptr() - <span class="kw">as </span><span class="kw-2">*mut </span>u8, - <span class="self">self</span>.len() * mem::size_of::<<span class="macro-nonterminal">$t</span>>() - ) - })<span class="question-mark">?</span>; - <span class="kw">for </span>x <span class="kw">in </span><span class="self">self </span>{ - <span class="kw-2">*</span>x = Wrapping(x.<span class="number">0</span>.to_le()); - } - } - <span class="prelude-val">Ok</span>(()) - } - } - }; - (<span class="macro-nonterminal">$t</span>:ty, $(<span class="macro-nonterminal">$tt</span>:ty,)<span class="kw-2">*</span>) => { - <span class="macro">impl_fill!</span>(<span class="macro-nonterminal">$t</span>); - <span class="comment">// TODO: this could replace above impl once Rust #32463 is fixed - // impl_fill!(Wrapping<$t>); - </span><span class="macro">impl_fill!</span>($(<span class="macro-nonterminal">$tt</span>,)<span class="kw-2">*</span>); - } -} - -<span class="macro">impl_fill!</span>(u16, u32, u64, usize, u128,); -<span class="macro">impl_fill!</span>(i8, i16, i32, i64, isize, i128,); - -<span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"min_const_gen"</span>)))] -#[cfg(feature = <span class="string">"min_const_gen"</span>)] -</span><span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Fill <span class="kw">for </span>[T; N] -<span class="kw">where </span>[T]: Fill -{ - <span class="kw">fn </span>try_fill<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&mut </span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="prelude-ty">Result</span><(), Error> { - <span class="self">self</span>[..].try_fill(rng) - } -} - -<span class="attribute">#[cfg(not(feature = <span class="string">"min_const_gen"</span>))] -</span><span class="macro">macro_rules! </span>impl_fill_arrays { - (<span class="macro-nonterminal">$n</span>:expr,) => {}; - (<span class="macro-nonterminal">$n</span>:expr, <span class="macro-nonterminal">$N</span>:ident) => { - <span class="kw">impl</span><T> Fill <span class="kw">for </span>[T; <span class="macro-nonterminal">$n</span>] <span class="kw">where </span>[T]: Fill { - <span class="kw">fn </span>try_fill<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&mut </span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="prelude-ty">Result</span><(), Error> { - <span class="self">self</span>[..].try_fill(rng) - } - } - }; - (<span class="macro-nonterminal">$n</span>:expr, <span class="macro-nonterminal">$N</span>:ident, $(<span class="macro-nonterminal">$NN</span>:ident,)<span class="kw-2">*</span>) => { - <span class="macro">impl_fill_arrays!</span>(<span class="macro-nonterminal">$n</span>, <span class="macro-nonterminal">$N</span>); - <span class="macro">impl_fill_arrays!</span>(<span class="macro-nonterminal">$n </span>- <span class="number">1</span>, $(<span class="macro-nonterminal">$NN</span>,)<span class="kw-2">*</span>); - }; - (!div <span class="macro-nonterminal">$n</span>:expr,) => {}; - (!div <span class="macro-nonterminal">$n</span>:expr, <span class="macro-nonterminal">$N</span>:ident, $(<span class="macro-nonterminal">$NN</span>:ident,)<span class="kw-2">*</span>) => { - <span class="macro">impl_fill_arrays!</span>(<span class="macro-nonterminal">$n</span>, <span class="macro-nonterminal">$N</span>); - <span class="macro">impl_fill_arrays!</span>(!div <span class="macro-nonterminal">$n </span>/ <span class="number">2</span>, $(<span class="macro-nonterminal">$NN</span>,)<span class="kw-2">*</span>); - }; -} -<span class="attribute">#[cfg(not(feature = <span class="string">"min_const_gen"</span>))] -#[rustfmt::skip] -</span><span class="macro">impl_fill_arrays!</span>(<span class="number">32</span>, N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,); -<span class="attribute">#[cfg(not(feature = <span class="string">"min_const_gen"</span>))] -</span><span class="macro">impl_fill_arrays!</span>(!div <span class="number">4096</span>, N,N,N,N,N,N,N,); - -<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="kw">use </span><span class="kw">crate</span>::test::rng; - <span class="kw">use </span><span class="kw">crate</span>::rngs::mock::StepRng; - <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] </span><span class="kw">use </span>alloc::boxed::Box; - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_fill_bytes_default() { - <span class="kw">let </span><span class="kw-2">mut </span>r = StepRng::new(<span class="number">0x11_22_33_44_55_66_77_88</span>, <span class="number">0</span>); - - <span class="comment">// check every remainder mod 8, both in small and big vectors. - </span><span class="kw">let </span>lengths = [<span class="number">0</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">80</span>, <span class="number">81</span>, <span class="number">82</span>, <span class="number">83</span>, <span class="number">84</span>, <span class="number">85</span>, <span class="number">86</span>, <span class="number">87</span>]; - <span class="kw">for </span><span class="kw-2">&</span>n <span class="kw">in </span>lengths.iter() { - <span class="kw">let </span><span class="kw-2">mut </span>buffer = [<span class="number">0u8</span>; <span class="number">87</span>]; - <span class="kw">let </span>v = <span class="kw-2">&mut </span>buffer[<span class="number">0</span>..n]; - r.fill_bytes(v); - - <span class="comment">// use this to get nicer error messages. - </span><span class="kw">for </span>(i, <span class="kw-2">&</span>byte) <span class="kw">in </span>v.iter().enumerate() { - <span class="kw">if </span>byte == <span class="number">0 </span>{ - <span class="macro">panic!</span>(<span class="string">"byte {} of {} is zero"</span>, i, n) - } - } - } - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_fill() { - <span class="kw">let </span>x = <span class="number">9041086907909331047</span>; <span class="comment">// a random u64 - </span><span class="kw">let </span><span class="kw-2">mut </span>rng = StepRng::new(x, <span class="number">0</span>); - - <span class="comment">// Convert to byte sequence and back to u64; byte-swap twice if BE. - </span><span class="kw">let </span><span class="kw-2">mut </span>array = [<span class="number">0u64</span>; <span class="number">2</span>]; - rng.fill(<span class="kw-2">&mut </span>array[..]); - <span class="macro">assert_eq!</span>(array, [x, x]); - <span class="macro">assert_eq!</span>(rng.next_u64(), x); - - <span class="comment">// Convert to bytes then u32 in LE order - </span><span class="kw">let </span><span class="kw-2">mut </span>array = [<span class="number">0u32</span>; <span class="number">2</span>]; - rng.fill(<span class="kw-2">&mut </span>array[..]); - <span class="macro">assert_eq!</span>(array, [x <span class="kw">as </span>u32, (x >> <span class="number">32</span>) <span class="kw">as </span>u32]); - <span class="macro">assert_eq!</span>(rng.next_u32(), x <span class="kw">as </span>u32); - - <span class="comment">// Check equivalence using wrapped arrays - </span><span class="kw">let </span><span class="kw-2">mut </span>warray = [Wrapping(<span class="number">0u32</span>); <span class="number">2</span>]; - rng.fill(<span class="kw-2">&mut </span>warray[..]); - <span class="macro">assert_eq!</span>(array[<span class="number">0</span>], warray[<span class="number">0</span>].<span class="number">0</span>); - <span class="macro">assert_eq!</span>(array[<span class="number">1</span>], warray[<span class="number">1</span>].<span class="number">0</span>); - - <span class="comment">// Check equivalence for generated floats - </span><span class="kw">let </span><span class="kw-2">mut </span>array = [<span class="number">0f32</span>; <span class="number">2</span>]; - rng.fill(<span class="kw-2">&mut </span>array); - <span class="kw">let </span>gen: [f32; <span class="number">2</span>] = rng.gen(); - <span class="macro">assert_eq!</span>(array, gen); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_fill_empty() { - <span class="kw">let </span><span class="kw-2">mut </span>array = [<span class="number">0u32</span>; <span class="number">0</span>]; - <span class="kw">let </span><span class="kw-2">mut </span>rng = StepRng::new(<span class="number">0</span>, <span class="number">1</span>); - rng.fill(<span class="kw-2">&mut </span>array); - rng.fill(<span class="kw-2">&mut </span>array[..]); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_gen_range_int() { - <span class="kw">let </span><span class="kw-2">mut </span>r = rng(<span class="number">101</span>); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">1000 </span>{ - <span class="kw">let </span>a = r.gen_range(-<span class="number">4711</span>..<span class="number">17</span>); - <span class="macro">assert!</span>((-<span class="number">4711</span>..<span class="number">17</span>).contains(<span class="kw-2">&</span>a)); - <span class="kw">let </span>a: i8 = r.gen_range(-<span class="number">3</span>..<span class="number">42</span>); - <span class="macro">assert!</span>((-<span class="number">3</span>..<span class="number">42</span>).contains(<span class="kw-2">&</span>a)); - <span class="kw">let </span>a: u16 = r.gen_range(<span class="number">10</span>..<span class="number">99</span>); - <span class="macro">assert!</span>((<span class="number">10</span>..<span class="number">99</span>).contains(<span class="kw-2">&</span>a)); - <span class="kw">let </span>a: i32 = r.gen_range(-<span class="number">100</span>..<span class="number">2000</span>); - <span class="macro">assert!</span>((-<span class="number">100</span>..<span class="number">2000</span>).contains(<span class="kw-2">&</span>a)); - <span class="kw">let </span>a: u32 = r.gen_range(<span class="number">12</span>..=<span class="number">24</span>); - <span class="macro">assert!</span>((<span class="number">12</span>..=<span class="number">24</span>).contains(<span class="kw-2">&</span>a)); - - <span class="macro">assert_eq!</span>(r.gen_range(<span class="number">0u32</span>..<span class="number">1</span>), <span class="number">0u32</span>); - <span class="macro">assert_eq!</span>(r.gen_range(-<span class="number">12i64</span>..-<span class="number">11</span>), -<span class="number">12i64</span>); - <span class="macro">assert_eq!</span>(r.gen_range(<span class="number">3_000_000</span>..<span class="number">3_000_001</span>), <span class="number">3_000_000</span>); - } - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_gen_range_float() { - <span class="kw">let </span><span class="kw-2">mut </span>r = rng(<span class="number">101</span>); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">1000 </span>{ - <span class="kw">let </span>a = r.gen_range(-<span class="number">4.5</span>..<span class="number">1.7</span>); - <span class="macro">assert!</span>((-<span class="number">4.5</span>..<span class="number">1.7</span>).contains(<span class="kw-2">&</span>a)); - <span class="kw">let </span>a = r.gen_range(-<span class="number">1.1</span>..=-<span class="number">0.3</span>); - <span class="macro">assert!</span>((-<span class="number">1.1</span>..=-<span class="number">0.3</span>).contains(<span class="kw-2">&</span>a)); - - <span class="macro">assert_eq!</span>(r.gen_range(<span class="number">0.0f32</span>..=<span class="number">0.0</span>), <span class="number">0.</span>); - <span class="macro">assert_eq!</span>(r.gen_range(-<span class="number">11.0</span>..=-<span class="number">11.0</span>), -<span class="number">11.</span>); - <span class="macro">assert_eq!</span>(r.gen_range(<span class="number">3_000_000.0</span>..=<span class="number">3_000_000.0</span>), <span class="number">3_000_000.</span>); - } - } - - <span class="attribute">#[test] - #[should_panic] - </span><span class="kw">fn </span>test_gen_range_panic_int() { - <span class="attribute">#![allow(clippy::reversed_empty_ranges)] - </span><span class="kw">let </span><span class="kw-2">mut </span>r = rng(<span class="number">102</span>); - r.gen_range(<span class="number">5</span>..-<span class="number">2</span>); - } - - <span class="attribute">#[test] - #[should_panic] - </span><span class="kw">fn </span>test_gen_range_panic_usize() { - <span class="attribute">#![allow(clippy::reversed_empty_ranges)] - </span><span class="kw">let </span><span class="kw-2">mut </span>r = rng(<span class="number">103</span>); - r.gen_range(<span class="number">5</span>..<span class="number">2</span>); - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_gen_bool() { - <span class="attribute">#![allow(clippy::bool_assert_comparison)] - - </span><span class="kw">let </span><span class="kw-2">mut </span>r = rng(<span class="number">105</span>); - <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">5 </span>{ - <span class="macro">assert_eq!</span>(r.gen_bool(<span class="number">0.0</span>), <span class="bool-val">false</span>); - <span class="macro">assert_eq!</span>(r.gen_bool(<span class="number">1.0</span>), <span class="bool-val">true</span>); - } - } - - <span class="attribute">#[test] - </span><span class="kw">fn </span>test_rng_trait_object() { - <span class="kw">use </span><span class="kw">crate</span>::distributions::{Distribution, Standard}; - <span class="kw">let </span><span class="kw-2">mut </span>rng = rng(<span class="number">109</span>); - <span class="kw">let </span><span class="kw-2">mut </span>r = <span class="kw-2">&mut </span>rng <span class="kw">as </span><span class="kw-2">&mut </span><span class="kw">dyn </span>RngCore; - r.next_u32(); - r.gen::<i32>(); - <span class="macro">assert_eq!</span>(r.gen_range(<span class="number">0</span>..<span class="number">1</span>), <span class="number">0</span>); - <span class="kw">let </span>_c: u8 = Standard.sample(<span class="kw-2">&mut </span>r); - } - - <span class="attribute">#[test] - #[cfg(feature = <span class="string">"alloc"</span>)] - </span><span class="kw">fn </span>test_rng_boxed_trait() { - <span class="kw">use </span><span class="kw">crate</span>::distributions::{Distribution, Standard}; - <span class="kw">let </span>rng = rng(<span class="number">110</span>); - <span class="kw">let </span><span class="kw-2">mut </span>r = Box::new(rng) <span class="kw">as </span>Box<<span class="kw">dyn </span>RngCore>; - r.next_u32(); - r.gen::<i32>(); - <span class="macro">assert_eq!</span>(r.gen_range(<span class="number">0</span>..<span class="number">1</span>), <span class="number">0</span>); - <span class="kw">let </span>_c: u8 = Standard.sample(<span class="kw-2">&mut </span>r); - } - - <span class="attribute">#[test] - #[cfg_attr(miri, ignore)] </span><span class="comment">// Miri is too slow - </span><span class="kw">fn </span>test_gen_ratio_average() { - <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">const </span>N: u32 = <span class="number">100_000</span>; - - <span class="kw">let </span><span class="kw-2">mut </span>sum: u32 = <span class="number">0</span>; - <span class="kw">let </span><span class="kw-2">mut </span>rng = rng(<span class="number">111</span>); - <span class="kw">for _ in </span><span class="number">0</span>..N { - <span class="kw">if </span>rng.gen_ratio(NUM, DENOM) { - sum += <span class="number">1</span>; - } - } - <span class="comment">// Have Binomial(N, NUM/DENOM) distribution - </span><span class="kw">let </span>expected = (NUM * N) / DENOM; <span class="comment">// exact integer - </span><span class="macro">assert!</span>(((sum - expected) <span class="kw">as </span>i32).abs() < <span class="number">500</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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