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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="Helper functions for implementing `RngCore` functions."><title>rand_core::impls - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="rand_core" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Module impls</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../rand_core/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../rand_core/index.html">rand_<wbr>core</a><span class="version">0.9.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module impls</a></h2><h3><a href="#functions">Module Items</a></h3><ul class="block"><li><a href="#functions" title="Functions">Functions</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="../index.html">In crate rand_<wbr>core</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">rand_core</a></div><h1>Module <span>impls</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/rand_core/impls.rs.html#9-217">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Helper functions for implementing <code>RngCore</code> functions.</p>
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<p>For cross-platform reproducibility, these functions all use Little Endian:
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least-significant part first. For example, <code>next_u64_via_u32</code> takes <code>u32</code>
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values <code>x, y</code>, then outputs <code>(y << 32) | x</code>. To implement <code>next_u32</code>
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from <code>next_u64</code> in little-endian order, one should use <code>next_u64() as u32</code>.</p>
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<p>Byte-swapping (like the std <code>to_le</code> functions) is only needed to convert
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to/from byte sequences, and since its purpose is reproducibility,
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non-reproducible sources (e.g. <code>OsRng</code>) need not bother with it.</p>
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</div></details><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><dl class="item-table"><dt><a class="fn" href="fn.fill_bytes_via_next.html" title="fn rand_core::impls::fill_bytes_via_next">fill_<wbr>bytes_<wbr>via_<wbr>next</a></dt><dd>Implement <code>fill_bytes</code> via <code>next_u64</code> and <code>next_u32</code>, little-endian order.</dd><dt><a class="fn" href="fn.fill_via_u32_chunks.html" title="fn rand_core::impls::fill_via_u32_chunks">fill_<wbr>via_<wbr>u32_<wbr>chunks</a><wbr><span class="stab deprecated" title="">Deprecated</span></dt><dd>Implement <code>fill_bytes</code> by reading chunks from the output buffer of a block
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based RNG.</dd><dt><a class="fn" href="fn.fill_via_u64_chunks.html" title="fn rand_core::impls::fill_via_u64_chunks">fill_<wbr>via_<wbr>u64_<wbr>chunks</a><wbr><span class="stab deprecated" title="">Deprecated</span></dt><dd>Implement <code>fill_bytes</code> by reading chunks from the output buffer of a block
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based RNG.</dd><dt><a class="fn" href="fn.next_u32_via_fill.html" title="fn rand_core::impls::next_u32_via_fill">next_<wbr>u32_<wbr>via_<wbr>fill</a></dt><dd>Implement <code>next_u32</code> via <code>fill_bytes</code>, little-endian order.</dd><dt><a class="fn" href="fn.next_u64_via_fill.html" title="fn rand_core::impls::next_u64_via_fill">next_<wbr>u64_<wbr>via_<wbr>fill</a></dt><dd>Implement <code>next_u64</code> via <code>fill_bytes</code>, little-endian order.</dd><dt><a class="fn" href="fn.next_u64_via_u32.html" title="fn rand_core::impls::next_u64_via_u32">next_<wbr>u64_<wbr>via_<wbr>u32</a></dt><dd>Implement <code>next_u64</code> via <code>next_u32</code>, little-endian order.</dd></dl></section></div></main></body></html> |