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| </pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project.</span> |
| <span class="comment">// Copyright 2013-2017 The Rust Project Developers.</span> |
| <span class="comment">//</span> |
| <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> |
| <span class="comment">// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> |
| <span class="comment">// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your</span> |
| <span class="comment">// option. This file may not be copied, modified, or distributed</span> |
| <span class="comment">// except according to those terms.</span> |
| |
| <span class="doccomment">//! Utilities for random number generation</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! Rand provides utilities to generate random numbers, to convert them to</span> |
| <span class="doccomment">//! useful types and distributions, and some randomness-related algorithms.</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! # Quick Start</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! To get you started quickly, the easiest and highest-level way to get</span> |
| <span class="doccomment">//! a random value is to use [`random()`]; alternatively you can use</span> |
| <span class="doccomment">//! [`thread_rng()`]. The [`Rng`] trait provides a useful API on all RNGs, while</span> |
| <span class="doccomment">//! the [`distributions`] and [`seq`] modules provide further</span> |
| <span class="doccomment">//! functionality on top of RNGs.</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! ```</span> |
| <span class="doccomment">//! use rand::prelude::*;</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! if rand::random() { // generates a boolean</span> |
| <span class="doccomment">//! // Try printing a random unicode code point (probably a bad idea)!</span> |
| <span class="doccomment">//! println!("char: {}", rand::random::<char>());</span> |
| <span class="doccomment">//! }</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! let mut rng = rand::thread_rng();</span> |
| <span class="doccomment">//! let y: f64 = rng.gen(); // generates a float between 0 and 1</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! let mut nums: Vec<i32> = (1..100).collect();</span> |
| <span class="doccomment">//! nums.shuffle(&mut rng);</span> |
| <span class="doccomment">//! ```</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! # The Book</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! For the user guide and further documentation, please read</span> |
| <span class="doccomment">//! [The Rust Rand Book](https://rust-random.github.io/book).</span> |
| |
| <span class="attribute">#![<span class="ident">doc</span>( |
| <span class="ident">html_logo_url</span> <span class="op">=</span> <span class="string">"https://www.rust-lang.org/logos/rust-logo-128x128-blk.png"</span>, |
| <span class="ident">html_favicon_url</span> <span class="op">=</span> <span class="string">"https://www.rust-lang.org/favicon.ico"</span>, |
| <span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">"https://rust-random.github.io/rand/"</span> |
| )]</span> |
| <span class="attribute">#![<span class="ident">deny</span>(<span class="ident">missing_docs</span>)]</span> |
| <span class="attribute">#![<span class="ident">deny</span>(<span class="ident">missing_debug_implementations</span>)]</span> |
| <span class="attribute">#![<span class="ident">doc</span>(<span class="ident">test</span>(<span class="ident">attr</span>(<span class="ident">allow</span>(<span class="ident">unused_variables</span>), <span class="ident">deny</span>(<span class="ident">warnings</span>))))]</span> |
| <span class="attribute">#![<span class="ident">no_std</span>]</span> |
| <span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_support"</span>, <span class="ident">feature</span>(<span class="ident">stdsimd</span>))]</span> |
| <span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"nightly"</span>, <span class="ident">feature</span>(<span class="ident">slice_partition_at_index</span>))]</span> |
| <span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">feature</span>(<span class="ident">doc_cfg</span>))]</span> |
| <span class="attribute">#![<span class="ident">allow</span>( |
| <span class="ident">clippy::float_cmp</span>, |
| <span class="ident">clippy::neg_cmp_op_on_partial_ord</span>, |
| )]</span> |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc"</span>)]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">alloc</span>; |
| |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused</span>)]</span> |
| <span class="macro">macro_rules!</span> <span class="ident">trace</span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => ( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"log"</span>)]</span> { |
| <span class="macro">log::trace!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>)<span class="kw-2">*</span>) |
| } |
| ) } |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused</span>)]</span> |
| <span class="macro">macro_rules!</span> <span class="ident">debug</span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => ( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"log"</span>)]</span> { |
| <span class="macro">log::debug!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>)<span class="kw-2">*</span>) |
| } |
| ) } |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused</span>)]</span> |
| <span class="macro">macro_rules!</span> <span class="ident">info</span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => ( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"log"</span>)]</span> { |
| <span class="macro">log::info!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>)<span class="kw-2">*</span>) |
| } |
| ) } |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused</span>)]</span> |
| <span class="macro">macro_rules!</span> <span class="ident">warn</span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => ( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"log"</span>)]</span> { |
| <span class="macro">log::warn!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>)<span class="kw-2">*</span>) |
| } |
| ) } |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused</span>)]</span> |
| <span class="macro">macro_rules!</span> <span class="ident">error</span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => ( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"log"</span>)]</span> { |
| <span class="macro">log::error!</span>($(<span class="macro-nonterminal">$</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</span> <span class="kw">use</span> <span class="ident">rand_core</span>::{<span class="ident">CryptoRng</span>, <span class="ident">Error</span>, <span class="ident">RngCore</span>, <span class="ident">SeedableRng</span>}; |
| |
| <span class="comment">// Public modules</span> |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">distributions</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">prelude</span>; |
| <span class="kw">mod</span> <span class="ident">rng</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">rngs</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">seq</span>; |
| |
| <span class="comment">// Public exports</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_rng"</span>))]</span> |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::rngs::thread::thread_rng</span>; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rng</span>::{<span class="ident">Fill</span>, <span class="ident">Rng</span>}; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_rng"</span>))]</span> |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::distributions</span>::{<span class="ident">Distribution</span>, <span class="ident">Standard</span>}; |
| |
| <span class="doccomment">/// Generates a random value using the thread-local random number generator.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is simply a shortcut for `thread_rng().gen()`. See [`thread_rng`] for</span> |
| <span class="doccomment">/// documentation of the entropy source and [`Standard`] for documentation of</span> |
| <span class="doccomment">/// distributions and type-specific generation.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Provided implementations</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The following types have provided implementations that</span> |
| <span class="doccomment">/// generate values with the following ranges and distributions:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// * Integers (`i32`, `u32`, `isize`, `usize`, etc.): Uniformly distributed</span> |
| <span class="doccomment">/// over all values of the type.</span> |
| <span class="doccomment">/// * `char`: Uniformly distributed over all Unicode scalar values, i.e. all</span> |
| <span class="doccomment">/// code points in the range `0...0x10_FFFF`, except for the range</span> |
| <span class="doccomment">/// `0xD800...0xDFFF` (the surrogate code points). This includes</span> |
| <span class="doccomment">/// unassigned/reserved code points.</span> |
| <span class="doccomment">/// * `bool`: Generates `false` or `true`, each with probability 0.5.</span> |
| <span class="doccomment">/// * Floating point types (`f32` and `f64`): Uniformly distributed in the</span> |
| <span class="doccomment">/// half-open range `[0, 1)`. See notes below.</span> |
| <span class="doccomment">/// * Wrapping integers (`Wrapping<T>`), besides the type identical to their</span> |
| <span class="doccomment">/// normal integer variants.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Also supported is the generation of the following</span> |
| <span class="doccomment">/// compound types where all component types are supported:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// * Tuples (up to 12 elements): each element is generated sequentially.</span> |
| <span class="doccomment">/// * Arrays (up to 32 elements): each element is generated sequentially;</span> |
| <span class="doccomment">/// see also [`Rng::fill`] which supports arbitrary array length for integer</span> |
| <span class="doccomment">/// types and tends to be faster for `u32` and smaller types.</span> |
| <span class="doccomment">/// * `Option<T>` first generates a `bool`, and if true generates and returns</span> |
| <span class="doccomment">/// `Some(value)` where `value: T`, otherwise returning `None`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Examples</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// let x = rand::random::<u8>();</span> |
| <span class="doccomment">/// println!("{}", x);</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let y = rand::random::<f64>();</span> |
| <span class="doccomment">/// println!("{}", y);</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// if rand::random() { // generates a boolean</span> |
| <span class="doccomment">/// println!("Better lucky than good!");</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If you're calling `random()` in a loop, caching the generator as in the</span> |
| <span class="doccomment">/// following example can increase performance.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use rand::Rng;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let mut v = vec![1, 2, 3];</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// for x in v.iter_mut() {</span> |
| <span class="doccomment">/// *x = rand::random()</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // can be made faster by caching thread_rng</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let mut rng = rand::thread_rng();</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// for x in v.iter_mut() {</span> |
| <span class="doccomment">/// *x = rng.gen();</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`Standard`]: distributions::Standard</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_rng"</span>))]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_rng"</span>))))]</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">random</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() -> <span class="ident">T</span> |
| <span class="kw">where</span> <span class="ident">Standard</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="ident">thread_rng</span>().<span class="ident">gen</span>() |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">test</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// Construct a deterministic RNG with the given seed</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rng</span>(<span class="ident">seed</span>: <span class="ident">u64</span>) -> <span class="kw">impl</span> <span class="ident">RngCore</span> { |
| <span class="comment">// For tests, we want a statistically good, fast, reproducible RNG.</span> |
| <span class="comment">// PCG32 will do fine, and will be easy to embed if we ever need to.</span> |
| <span class="kw">const</span> <span class="ident">INC</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">11634580027462260723</span>; |
| <span class="ident">rand_pcg::Pcg32::new</span>(<span class="ident">seed</span>, <span class="ident">INC</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_rng"</span>))]</span> |
| <span class="kw">fn</span> <span class="ident">test_random</span>() { |
| <span class="kw">let</span> <span class="ident">_n</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">random</span>(); |
| <span class="kw">let</span> <span class="ident">_f</span>: <span class="ident">f32</span> <span class="op">=</span> <span class="ident">random</span>(); |
| <span class="kw">let</span> <span class="ident">_o</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i8</span><span class="op">></span><span class="op">></span> <span class="op">=</span> <span class="ident">random</span>(); |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::type_complexity</span>)]</span> |
| <span class="kw">let</span> <span class="ident">_many</span>: ( |
| (), |
| (<span class="ident">usize</span>, <span class="ident">isize</span>, <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">u32</span>, (<span class="ident">bool</span>,))<span class="op">></span>), |
| (<span class="ident">u8</span>, <span class="ident">i8</span>, <span class="ident">u16</span>, <span class="ident">i16</span>, <span class="ident">u32</span>, <span class="ident">i32</span>, <span class="ident">u64</span>, <span class="ident">i64</span>), |
| (<span class="ident">f32</span>, (<span class="ident">f64</span>, (<span class="ident">f64</span>,))), |
| ) <span class="op">=</span> <span class="ident">random</span>(); |
| } |
| } |
| </code></pre></div> |
| </section><section id="search" class="content hidden"></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="1.60.0-nightly (1bd4fdc94 2022-01-12)" ></div> |
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