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<!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 to the Rust file `/home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.3.22/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../rand/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, 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">//! This release is a compatibility wrapper around `rand` version 0.4. Please</span>
<span class="doccomment">//! upgrade.</span>
<span class="attribute">#![<span class="ident">doc</span>(<span class="ident">html_logo_url</span> <span class="op">=</span> <span class="string">&quot;https://www.rust-lang.org/logos/rust-logo-128x128-blk.png&quot;</span>,
<span class="ident">html_favicon_url</span> <span class="op">=</span> <span class="string">&quot;https://www.rust-lang.org/favicon.ico&quot;</span>,
<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">&quot;https://docs.rs/rand/0.3&quot;</span>)]</span>
<span class="attribute">#![<span class="ident">deny</span>(<span class="ident">missing_debug_implementations</span>)]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;i128_support&quot;</span>, <span class="ident">feature</span>(<span class="ident">i128_type</span>))]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">rand</span> <span class="kw">as</span> <span class="ident">rand4</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::<span class="ident">OsRng</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::{<span class="ident">IsaacRng</span>, <span class="ident">Isaac64Rng</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::<span class="ident">ChaChaRng</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">distributions</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::{<span class="ident">isaac</span>, <span class="ident">chacha</span>, <span class="ident">reseeding</span>, <span class="ident">os</span>, <span class="ident">read</span>};
<span class="kw">mod</span> <span class="ident">rand_impls</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::<span class="ident">Rng</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::<span class="ident">Rand</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::<span class="ident">SeedableRng</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::{<span class="ident">Generator</span>, <span class="ident">AsciiGenerator</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::<span class="ident">XorShiftRng</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::{<span class="ident">Open01</span>, <span class="ident">Closed01</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::<span class="ident">StdRng</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::{<span class="ident">weak_rng</span>, <span class="ident">ThreadRng</span>, <span class="ident">thread_rng</span>, <span class="ident">random</span>};
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rand4</span>::<span class="ident">sample</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</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="ident">Rng</span>, <span class="ident">thread_rng</span>, <span class="ident">random</span>, <span class="ident">SeedableRng</span>, <span class="ident">StdRng</span>, <span class="ident">sample</span>,
<span class="ident">weak_rng</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>::<span class="ident">repeat</span>;
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MyRng</span><span class="op">&lt;</span><span class="ident">R</span><span class="op">&gt;</span> { <span class="ident">inner</span>: <span class="ident">R</span> }
<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">R</span>: <span class="ident">Rng</span><span class="op">&gt;</span> <span class="ident">Rng</span> <span class="kw">for</span> <span class="ident">MyRng</span><span class="op">&lt;</span><span class="ident">R</span><span class="op">&gt;</span> {
<span class="kw">fn</span> <span class="ident">next_u32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">u32</span> {
<span class="kw">fn</span> <span class="ident">next</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Rng</span><span class="op">&gt;</span>(<span class="ident">t</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">u32</span> {
<span class="ident">t</span>.<span class="ident">next_u32</span>()
}
<span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">inner</span>)
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rng</span>() <span class="op">-&gt;</span> <span class="ident">MyRng</span><span class="op">&lt;</span>::<span class="ident">ThreadRng</span><span class="op">&gt;</span> {
<span class="ident">MyRng</span> { <span class="ident">inner</span>: ::<span class="ident">thread_rng</span>() }
}
<span class="kw">struct</span> <span class="ident">ConstRng</span> { <span class="ident">i</span>: <span class="ident">u64</span> }
<span class="kw">impl</span> <span class="ident">Rng</span> <span class="kw">for</span> <span class="ident">ConstRng</span> {
<span class="kw">fn</span> <span class="ident">next_u32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">u32</span> { <span class="self">self</span>.<span class="ident">i</span> <span class="kw">as</span> <span class="ident">u32</span> }
<span class="kw">fn</span> <span class="ident">next_u64</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">u64</span> { <span class="self">self</span>.<span class="ident">i</span> }
<span class="comment">// no fill_bytes on purpose</span>
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter_eq</span><span class="op">&lt;</span><span class="ident">I</span>, <span class="ident">J</span><span class="op">&gt;</span>(<span class="ident">i</span>: <span class="ident">I</span>, <span class="ident">j</span>: <span class="ident">J</span>) <span class="op">-&gt;</span> <span class="ident">bool</span>
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">IntoIterator</span>,
<span class="ident">J</span>: <span class="ident">IntoIterator</span><span class="op">&lt;</span><span class="ident">Item</span><span class="op">=</span><span class="ident">I</span>::<span class="ident">Item</span><span class="op">&gt;</span>,
<span class="ident">I</span>::<span class="ident">Item</span>: <span class="ident">Eq</span>
{
<span class="comment">// make sure the iterators have equal length</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="ident">i</span>.<span class="ident">into_iter</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">j</span> <span class="op">=</span> <span class="ident">j</span>.<span class="ident">into_iter</span>();
<span class="kw">loop</span> {
<span class="kw">match</span> (<span class="ident">i</span>.<span class="ident">next</span>(), <span class="ident">j</span>.<span class="ident">next</span>()) {
(<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">ei</span>), <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">ej</span>)) <span class="kw">if</span> <span class="ident">ei</span> <span class="op">==</span> <span class="ident">ej</span> <span class="op">=&gt;</span> { }
(<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="bool-val">true</span>,
<span class="kw">_</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="bool-val">false</span>,
}
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_fill_bytes_default</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">ConstRng</span> { <span class="ident">i</span>: <span class="number">0x11_22_33_44_55_66_77_88</span> };
<span class="comment">// check every remainder mod 8, both in small and big vectors.</span>
<span class="kw">let</span> <span class="ident">lengths</span> <span class="op">=</span> [<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">&amp;</span><span class="ident">n</span> <span class="kw">in</span> <span class="ident">lengths</span>.<span class="ident">iter</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">repeat</span>(<span class="number">0u8</span>).<span class="ident">take</span>(<span class="ident">n</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;&gt;</span>();
<span class="ident">r</span>.<span class="ident">fill_bytes</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">v</span>);
<span class="comment">// use this to get nicer error messages.</span>
<span class="kw">for</span> (<span class="ident">i</span>, <span class="kw-2">&amp;</span><span class="ident">byte</span>) <span class="kw">in</span> <span class="ident">v</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
<span class="kw">if</span> <span class="ident">byte</span> <span class="op">==</span> <span class="number">0</span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;byte {} of {} is zero&quot;</span>, <span class="ident">i</span>, <span class="ident">n</span>)
}
}
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_gen_range</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">1000</span> {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">gen_range</span>(<span class="op">-</span><span class="number">3</span>, <span class="number">42</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span> <span class="op">&gt;=</span> <span class="op">-</span><span class="number">3</span> <span class="op">&amp;&amp;</span> <span class="ident">a</span> <span class="op">&lt;</span> <span class="number">42</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_range</span>(<span class="number">0</span>, <span class="number">1</span>), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_range</span>(<span class="op">-</span><span class="number">12</span>, <span class="op">-</span><span class="number">11</span>), <span class="op">-</span><span class="number">12</span>);
}
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">1000</span> {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">gen_range</span>(<span class="number">10</span>, <span class="number">42</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span> <span class="op">&gt;=</span> <span class="number">10</span> <span class="op">&amp;&amp;</span> <span class="ident">a</span> <span class="op">&lt;</span> <span class="number">42</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_range</span>(<span class="number">0</span>, <span class="number">1</span>), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_range</span>(<span class="number">3_000_000</span>, <span class="number">3_000_001</span>), <span class="number">3_000_000</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">should_panic</span>]</span>
<span class="kw">fn</span> <span class="ident">test_gen_range_panic_int</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
<span class="ident">r</span>.<span class="ident">gen_range</span>(<span class="number">5</span>, <span class="op">-</span><span class="number">2</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">should_panic</span>]</span>
<span class="kw">fn</span> <span class="ident">test_gen_range_panic_usize</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
<span class="ident">r</span>.<span class="ident">gen_range</span>(<span class="number">5</span>, <span class="number">2</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_gen_weighted_bool</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_weighted_bool</span>(<span class="number">0</span>), <span class="bool-val">true</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_weighted_bool</span>(<span class="number">1</span>), <span class="bool-val">true</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_gen_ascii_str</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">0</span>).<span class="ident">count</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">10</span>).<span class="ident">count</span>(), <span class="number">10</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">16</span>).<span class="ident">count</span>(), <span class="number">16</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_gen_vec</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_iter</span>::<span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>().<span class="ident">take</span>(<span class="number">0</span>).<span class="ident">count</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_iter</span>::<span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>().<span class="ident">take</span>(<span class="number">10</span>).<span class="ident">count</span>(), <span class="number">10</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_iter</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>().<span class="ident">take</span>(<span class="number">16</span>).<span class="ident">count</span>(), <span class="number">16</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_choose</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">choose</span>(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>]).<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">&amp;</span><span class="ident">x</span><span class="op">|</span><span class="ident">x</span>), <span class="prelude-val">Some</span>(<span class="number">1</span>));
<span class="kw">let</span> <span class="ident">v</span>: <span class="kw-2">&amp;</span>[<span class="ident">isize</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">choose</span>(<span class="ident">v</span>), <span class="prelude-val">None</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_shuffle</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
<span class="kw">let</span> <span class="ident">empty</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">isize</span>] <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [];
<span class="ident">r</span>.<span class="ident">shuffle</span>(<span class="ident">empty</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">one</span> <span class="op">=</span> [<span class="number">1</span>];
<span class="ident">r</span>.<span class="ident">shuffle</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">one</span>);
<span class="kw">let</span> <span class="ident">b</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="number">1</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">one</span>, <span class="ident">b</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">two</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>];
<span class="ident">r</span>.<span class="ident">shuffle</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">two</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">two</span> <span class="op">==</span> [<span class="number">1</span>, <span class="number">2</span>] <span class="op">||</span> <span class="ident">two</span> <span class="op">==</span> [<span class="number">2</span>, <span class="number">1</span>]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>];
<span class="ident">r</span>.<span class="ident">shuffle</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">x</span>);
<span class="kw">let</span> <span class="ident">b</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="ident">b</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_thread_rng</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
<span class="ident">r</span>.<span class="ident">gen</span>::<span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>];
<span class="ident">r</span>.<span class="ident">shuffle</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">v</span>);
<span class="kw">let</span> <span class="ident">b</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">b</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_range</span>(<span class="number">0</span>, <span class="number">1</span>), <span class="number">0</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_rng_trait_object</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">rng</span> <span class="kw">as</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Rng</span>;
<span class="ident">r</span>.<span class="ident">next_u32</span>();
(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">r</span>).<span class="ident">gen</span>::<span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>];
(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">r</span>).<span class="ident">shuffle</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">v</span>);
<span class="kw">let</span> <span class="ident">b</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">b</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">r</span>).<span class="ident">gen_range</span>(<span class="number">0</span>, <span class="number">1</span>), <span class="number">0</span>);
}
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">rng</span>) <span class="kw">as</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">Rng</span><span class="op">&gt;</span>;
<span class="ident">r</span>.<span class="ident">next_u32</span>();
<span class="ident">r</span>.<span class="ident">gen</span>::<span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>];
<span class="ident">r</span>.<span class="ident">shuffle</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">v</span>);
<span class="kw">let</span> <span class="ident">b</span>: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">b</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">gen_range</span>(<span class="number">0</span>, <span class="number">1</span>), <span class="number">0</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_random</span>() {
<span class="comment">// not sure how to test this aside from just getting some values</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">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i8</span><span class="op">&gt;&gt;</span> <span class="op">=</span> <span class="ident">random</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">&lt;</span>(<span class="ident">u32</span>, (<span class="ident">bool</span>,))<span class="op">&gt;</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>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_sample</span>() {
<span class="kw">let</span> <span class="ident">min_val</span> <span class="op">=</span> <span class="number">1</span>;
<span class="kw">let</span> <span class="ident">max_val</span> <span class="op">=</span> <span class="number">100</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
<span class="kw">let</span> <span class="ident">vals</span> <span class="op">=</span> (<span class="ident">min_val</span>..<span class="ident">max_val</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;&gt;</span>();
<span class="kw">let</span> <span class="ident">small_sample</span> <span class="op">=</span> <span class="ident">sample</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">r</span>, <span class="ident">vals</span>.<span class="ident">iter</span>(), <span class="number">5</span>);
<span class="kw">let</span> <span class="ident">large_sample</span> <span class="op">=</span> <span class="ident">sample</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">r</span>, <span class="ident">vals</span>.<span class="ident">iter</span>(), <span class="ident">vals</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">5</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">small_sample</span>.<span class="ident">len</span>(), <span class="number">5</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">large_sample</span>.<span class="ident">len</span>(), <span class="ident">vals</span>.<span class="ident">len</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">small_sample</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> {
<span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span> <span class="op">&gt;=</span> <span class="ident">min_val</span> <span class="op">&amp;&amp;</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span> <span class="op">&lt;=</span> <span class="ident">max_val</span>
}));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_std_rng_seeded</span>() {
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">thread_rng</span>().<span class="ident">gen_iter</span>::<span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>().<span class="ident">take</span>(<span class="number">256</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;&gt;</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ra</span>: <span class="ident">StdRng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rb</span>: <span class="ident">StdRng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>[..]);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">iter_eq</span>(<span class="ident">ra</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>),
<span class="ident">rb</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>)));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_std_rng_reseed</span>() {
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">thread_rng</span>().<span class="ident">gen_iter</span>::<span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>().<span class="ident">take</span>(<span class="number">256</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;&gt;</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span>: <span class="ident">StdRng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>[..]);
<span class="kw">let</span> <span class="ident">string1</span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>();
<span class="ident">r</span>.<span class="ident">reseed</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>);
<span class="kw">let</span> <span class="ident">string2</span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">string1</span>, <span class="ident">string2</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_weak_rng</span>() {
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">weak_rng</span>().<span class="ident">gen_iter</span>::<span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>().<span class="ident">take</span>(<span class="number">256</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;&gt;</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ra</span>: <span class="ident">StdRng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rb</span>: <span class="ident">StdRng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>[..]);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">iter_eq</span>(<span class="ident">ra</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>),
<span class="ident">rb</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>)));
}
}
</pre>
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