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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 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This file may not be copied, modified, or distributed -// except according to those terms. - -</span><span class="doccomment">//! Utilities for random number generation -//! -//! Rand provides utilities to generate random numbers, to convert them to -//! useful types and distributions, and some randomness-related algorithms. -//! -//! # Quick Start -//! -//! To get you started quickly, the easiest and highest-level way to get -//! a random value is to use [`random()`]; alternatively you can use -//! [`thread_rng()`]. The [`Rng`] trait provides a useful API on all RNGs, while -//! the [`distributions`] and [`seq`] modules provide further -//! functionality on top of RNGs. -//! -//! ``` -//! use rand::prelude::*; -//! -//! if rand::random() { // generates a boolean -//! // Try printing a random unicode code point (probably a bad idea)! -//! println!("char: {}", rand::random::<char>()); -//! } -//! -//! let mut rng = rand::thread_rng(); -//! let y: f64 = rng.gen(); // generates a float between 0 and 1 -//! -//! let mut nums: Vec<i32> = (1..100).collect(); -//! nums.shuffle(&mut rng); -//! ``` -//! -//! # The Book -//! -//! For the user guide and further documentation, please read -//! [The Rust Rand Book](https://rust-random.github.io/book). - -</span><span class="attribute">#![doc( - html_logo_url = <span class="string">"https://www.rust-lang.org/logos/rust-logo-128x128-blk.png"</span>, - html_favicon_url = <span class="string">"https://www.rust-lang.org/favicon.ico"</span>, - html_root_url = <span class="string">"https://rust-random.github.io/rand/" -</span>)] -#![deny(missing_docs)] -#![deny(missing_debug_implementations)] -#![doc(test(attr(allow(unused_variables), deny(warnings))))] -#![no_std] -#![cfg_attr(feature = <span class="string">"simd_support"</span>, feature(stdsimd))] -#![cfg_attr(doc_cfg, feature(doc_cfg))] -#![allow( - clippy::float_cmp, - clippy::neg_cmp_op_on_partial_ord, -)] - -#[cfg(feature = <span class="string">"std"</span>)] </span><span class="kw">extern crate </span>std; -<span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] </span><span class="kw">extern crate </span>alloc; - -<span class="attribute">#[allow(unused)] -</span><span class="macro">macro_rules! </span>trace { ($(<span class="macro-nonterminal">$x</span>:tt)<span class="kw-2">*</span>) => ( - <span class="attribute">#[cfg(feature = <span class="string">"log"</span>)] </span>{ - <span class="macro">log::trace!</span>($(<span class="macro-nonterminal">$x</span>)<span class="kw-2">*</span>) - } -) } -<span class="attribute">#[allow(unused)] -</span><span class="macro">macro_rules! </span>debug { ($(<span class="macro-nonterminal">$x</span>:tt)<span class="kw-2">*</span>) => ( - <span class="attribute">#[cfg(feature = <span class="string">"log"</span>)] </span>{ - <span class="macro">log::debug!</span>($(<span class="macro-nonterminal">$x</span>)<span class="kw-2">*</span>) - } -) } -<span class="attribute">#[allow(unused)] -</span><span class="macro">macro_rules! </span>info { ($(<span class="macro-nonterminal">$x</span>:tt)<span class="kw-2">*</span>) => ( - <span class="attribute">#[cfg(feature = <span class="string">"log"</span>)] </span>{ - <span class="macro">log::info!</span>($(<span class="macro-nonterminal">$x</span>)<span class="kw-2">*</span>) - } -) } -<span class="attribute">#[allow(unused)] -</span><span class="macro">macro_rules! </span>warn { ($(<span class="macro-nonterminal">$x</span>:tt)<span class="kw-2">*</span>) => ( - <span class="attribute">#[cfg(feature = <span class="string">"log"</span>)] </span>{ - <span class="macro">log::warn!</span>($(<span class="macro-nonterminal">$x</span>)<span class="kw-2">*</span>) - } -) } -<span class="attribute">#[allow(unused)] -</span><span class="macro">macro_rules! </span>error { ($(<span class="macro-nonterminal">$x</span>:tt)<span class="kw-2">*</span>) => ( - <span class="attribute">#[cfg(feature = <span class="string">"log"</span>)] </span>{ - <span class="macro">log::error!</span>($(<span class="macro-nonterminal">$x</span>)<span class="kw-2">*</span>) - } -) } - -<span class="comment">// Re-exports from rand_core -</span><span class="kw">pub use </span>rand_core::{CryptoRng, Error, RngCore, SeedableRng}; - -<span class="comment">// Public modules -</span><span class="kw">pub mod </span>distributions; -<span class="kw">pub mod </span>prelude; -<span class="kw">mod </span>rng; -<span class="kw">pub mod </span>rngs; -<span class="kw">pub mod </span>seq; - -<span class="comment">// Public exports -</span><span class="attribute">#[cfg(all(feature = <span class="string">"std"</span>, feature = <span class="string">"std_rng"</span>))] -</span><span class="kw">pub use </span><span class="kw">crate</span>::rngs::thread::thread_rng; -<span class="kw">pub use </span>rng::{Fill, Rng}; - -<span class="attribute">#[cfg(all(feature = <span class="string">"std"</span>, feature = <span class="string">"std_rng"</span>))] -</span><span class="kw">use </span><span class="kw">crate</span>::distributions::{Distribution, Standard}; - -<span class="doccomment">/// Generates a random value using the thread-local random number generator. -/// -/// This is simply a shortcut for `thread_rng().gen()`. See [`thread_rng`] for -/// documentation of the entropy source and [`Standard`] for documentation of -/// distributions and type-specific generation. -/// -/// # Provided implementations -/// -/// The following types have provided implementations that -/// 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. -/// -/// Also supported is the 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 -/// types and tends to be faster for `u32` and smaller types. -/// * `Option<T>` first generates a `bool`, and if true generates and returns -/// `Some(value)` where `value: T`, otherwise returning `None`. -/// -/// # Examples -/// -/// ``` -/// let x = rand::random::<u8>(); -/// println!("{}", x); -/// -/// let y = rand::random::<f64>(); -/// println!("{}", y); -/// -/// if rand::random() { // generates a boolean -/// println!("Better lucky than good!"); -/// } -/// ``` -/// -/// If you're calling `random()` in a loop, caching the generator as in the -/// following example can increase performance. -/// -/// ``` -/// use rand::Rng; -/// -/// let mut v = vec![1, 2, 3]; -/// -/// for x in v.iter_mut() { -/// *x = rand::random() -/// } -/// -/// // can be made faster by caching thread_rng -/// -/// let mut rng = rand::thread_rng(); -/// -/// for x in v.iter_mut() { -/// *x = rng.gen(); -/// } -/// ``` -/// -/// [`Standard`]: distributions::Standard -</span><span class="attribute">#[cfg(all(feature = <span class="string">"std"</span>, feature = <span class="string">"std_rng"</span>))] -#[cfg_attr(doc_cfg, doc(cfg(all(feature = <span class="string">"std"</span>, feature = <span class="string">"std_rng"</span>))))] -#[inline] -</span><span class="kw">pub fn </span>random<T>() -> T -<span class="kw">where </span>Standard: Distribution<T> { - thread_rng().gen() -} - -<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="doccomment">/// Construct a deterministic RNG with the given seed - </span><span class="kw">pub fn </span>rng(seed: u64) -> <span class="kw">impl </span>RngCore { - <span class="comment">// For tests, we want a statistically good, fast, reproducible RNG. - // PCG32 will do fine, and will be easy to embed if we ever need to. - </span><span class="kw">const </span>INC: u64 = <span class="number">11634580027462260723</span>; - rand_pcg::Pcg32::new(seed, INC) - } - - <span class="attribute">#[test] - #[cfg(all(feature = <span class="string">"std"</span>, feature = <span class="string">"std_rng"</span>))] - </span><span class="kw">fn </span>test_random() { - <span class="kw">let </span>_n: usize = random(); - <span class="kw">let </span>_f: f32 = random(); - <span class="kw">let </span>_o: <span class="prelude-ty">Option</span><<span class="prelude-ty">Option</span><i8>> = random(); - <span class="attribute">#[allow(clippy::type_complexity)] - </span><span class="kw">let </span>_many: ( - (), - (usize, isize, <span class="prelude-ty">Option</span><(u32, (bool,))>), - (u8, i8, u16, i16, u32, i32, u64, i64), - (f32, (f64, (f64,))), - ) = random(); - } -} -</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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