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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="API documentation for the Rust `block` mod in crate `rand_core`."><meta name="keywords" content="rust, rustlang, rust-lang, block"><title>rand_core::block - Rust</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><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="https://www.rust-lang.org/favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[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">☰</div><a href='../../rand_core/index.html'><div class='logo-container'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk.png' alt='logo'></div></a><p class='location'>Module block</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li></ul></div><p class='location'><a href='../index.html'>rand_core</a></p><script>window.sidebarCurrent = {name: 'block', ty: 'mod', relpath: '../'};</script><script defer src="../sidebar-items.js"></script></div></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"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><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"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../src/rand_core/lib.rs.html#57' title='goto source code'>[src]</a></span><span class='in-band'>Module <a href='../index.html'>rand_core</a>::<wbr><a class="mod" href=''>block</a></span></h1><div class='docblock'><p>The <code>BlockRngCore</code> trait and implementation helpers</p>
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<p>The <a href="crate::block::BlockRngCore"><code>BlockRngCore</code></a> trait exists to assist in the implementation of RNGs
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which generate a block of data in a cache instead of returning generated
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values directly.</p>
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<p>Usage of this trait is optional, but provides two advantages:
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implementations only need to concern themselves with generation of the
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block, not the various [<code>RngCore</code>] methods (especially <a href="RngCore::fill_bytes"><code>fill_bytes</code></a>, where
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the optimal implementations are not trivial), and this allows
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<code>ReseedingRng</code> (see <a href="https://docs.rs/rand"><code>rand</code></a> crate) perform periodic
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reseeding with very low overhead.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<pre><code class="language-norun">use rand_core::block::{BlockRngCore, BlockRng};
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struct MyRngCore;
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impl BlockRngCore for MyRngCore {
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type Results = [u32; 16];
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fn generate(&mut self, results: &mut Self::Results) {
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unimplemented!()
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}
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}
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impl SeedableRng for MyRngCore {
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type Seed = unimplemented!();
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fn from_seed(seed: Self::Seed) -> Self {
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unimplemented!()
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}
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}
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// optionally, also implement CryptoRng for MyRngCore
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// Final RNG.
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type MyRng = BlockRng<u32, MyRngCore>;
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</code></pre>
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</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table><tr class='module-item'><td><a class="struct" href="struct.BlockRng.html" title='rand_core::block::BlockRng struct'>BlockRng</a></td><td class='docblock-short'><p>A wrapper type implementing [<code>RngCore</code>] for some type implementing
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[<code>BlockRngCore</code>] with <code>u32</code> array buffer; i.e. this can be used to implement
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a full RNG from just a <code>generate</code> function.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.BlockRng64.html" title='rand_core::block::BlockRng64 struct'>BlockRng64</a></td><td class='docblock-short'><p>A wrapper type implementing [<code>RngCore</code>] for some type implementing
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[<code>BlockRngCore</code>] with <code>u64</code> array buffer; i.e. this can be used to implement
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a full RNG from just a <code>generate</code> function.</p>
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</td></tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
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<table><tr class='module-item'><td><a class="trait" href="trait.BlockRngCore.html" title='rand_core::block::BlockRngCore trait'>BlockRngCore</a></td><td class='docblock-short'><p>A trait for RNGs which do not generate random numbers individually, but in
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blocks (typically <code>[u32; N]</code>). This technique is commonly used by
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cryptographic RNGs to improve performance.</p>
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