| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/git/checkouts/incubator-teaclave-crates-c8106113f74feefc/ede1f68/rand/src/rngs/mock.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mock.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../rand/index.html"><div class="logo-container"> |
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| <img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><form class="search-form"><div class="search-container"><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></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| </span><span class="doccomment">//! Mock random number generator |
| |
| </span><span class="kw">use </span>rand_core::{impls, Error, RngCore}; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] |
| </span><span class="kw">use </span>serde::{Serialize, Deserialize}; |
| |
| <span class="doccomment">/// A simple implementation of `RngCore` for testing purposes. |
| /// |
| /// This generates an arithmetic sequence (i.e. adds a constant each step) |
| /// over a `u64` number, using wrapping arithmetic. If the increment is 0 |
| /// the generator yields a constant. |
| /// |
| /// ``` |
| /// use rand::Rng; |
| /// use rand::rngs::mock::StepRng; |
| /// |
| /// let mut my_rng = StepRng::new(2, 1); |
| /// let sample: [u64; 3] = my_rng.gen(); |
| /// assert_eq!(sample, [2, 3, 4]); |
| /// ``` |
| </span><span class="attribute">#[derive(Debug, Clone, PartialEq, Eq)] |
| #[cfg_attr(feature = <span class="string">"serde1"</span>, derive(Serialize, Deserialize))] |
| </span><span class="kw">pub struct </span>StepRng { |
| v: u64, |
| a: u64, |
| } |
| |
| <span class="kw">impl </span>StepRng { |
| <span class="doccomment">/// Create a `StepRng`, yielding an arithmetic sequence starting with |
| /// `initial` and incremented by `increment` each time. |
| </span><span class="kw">pub fn </span>new(initial: u64, increment: u64) -> <span class="self">Self </span>{ |
| StepRng { |
| v: initial, |
| a: increment, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>RngCore <span class="kw">for </span>StepRng { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next_u32(<span class="kw-2">&mut </span><span class="self">self</span>) -> u32 { |
| <span class="self">self</span>.next_u64() <span class="kw">as </span>u32 |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next_u64(<span class="kw-2">&mut </span><span class="self">self</span>) -> u64 { |
| <span class="kw">let </span>result = <span class="self">self</span>.v; |
| <span class="self">self</span>.v = <span class="self">self</span>.v.wrapping_add(<span class="self">self</span>.a); |
| result |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>fill_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, dest: <span class="kw-2">&mut </span>[u8]) { |
| impls::fill_bytes_via_next(<span class="self">self</span>, dest); |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>try_fill_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, dest: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="self">self</span>.fill_bytes(dest); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="attribute">#[test] |
| #[cfg(feature = <span class="string">"serde1"</span>)] |
| </span><span class="kw">fn </span>test_serialization_step_rng() { |
| <span class="kw">use </span><span class="kw">super</span>::StepRng; |
| |
| <span class="kw">let </span>some_rng = StepRng::new(<span class="number">42</span>, <span class="number">7</span>); |
| <span class="kw">let </span>de_some_rng: StepRng = |
| bincode::deserialize(<span class="kw-2">&</span>bincode::serialize(<span class="kw-2">&</span>some_rng).unwrap()).unwrap(); |
| <span class="macro">assert_eq!</span>(some_rng.v, de_some_rng.v); |
| <span class="macro">assert_eq!</span>(some_rng.a, de_some_rng.a); |
| |
| } |
| } |
| </code></pre></div> |
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