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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 `RngCore` trait in crate `rand`."><meta name="keywords" content="rust, rustlang, rust-lang, RngCore"><title>rand::RngCore - 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><link rel="shortcut icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc trait"><!--[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><p class='location'>Trait RngCore</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.next_u32">next_u32</a><a href="#tymethod.next_u64">next_u64</a><a href="#tymethod.fill_bytes">fill_bytes</a><a href="#tymethod.try_fill_bytes">try_fill_bytes</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-RngCore">Box&lt;R&gt;</a><a href="#impl-RngCore">BlockRng&lt;R&gt;</a><a href="#impl-RngCore">BlockRng64&lt;R&gt;</a><a href="#impl-RngCore">&amp;&#39;a mut R</a></div><a class="sidebar-title" href="#implementors">Implementors</a><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Read">Read</a></div></div><p class='location'><a href='index.html'>rand</a></p><script>window.sidebarCurrent = {name: 'RngCore', ty: 'trait', 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"><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"><h1 class='fqn'><span class='in-band'>Trait <a href='index.html'>rand</a>::<wbr><a class="trait" href=''>RngCore</a></span><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'>&#x2212;</span>]</a></span><a class='srclink' href='../src/rand_core/lib.rs.html#147-193' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust trait'>pub trait RngCore {
fn <a href='#tymethod.next_u32' class='fnname'>next_u32</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>;
<div class='item-spacer'></div> fn <a href='#tymethod.next_u64' class='fnname'>next_u64</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>;
<div class='item-spacer'></div> fn <a href='#tymethod.fill_bytes' class='fnname'>fill_bytes</a>(&amp;mut self, dest: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>);
<div class='item-spacer'></div> fn <a href='#tymethod.try_fill_bytes' class='fnname'>try_fill_bytes</a>(&amp;mut self, dest: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&gt;;
}</pre></div><div class='docblock'><p>The core of a random number generator.</p>
<p>This trait encapsulates the low-level functionality common to all
generators, and is the &quot;back end&quot;, to be implemented by generators.
End users should normally use <a href="../rand/trait.Rng.html"><code>Rng</code></a> from the <a href="https://crates.io/crates/rand">rand</a> crate, which is
automatically implemented for every type implementing <code>RngCore</code>.</p>
<p>Three different methods for generating random data are provided since the
optimal implementation of each is dependent on the type of generator. There
is no required relationship between the output of each; e.g. many
implementations of <a href="trait.RngCore.html#tymethod.fill_bytes"><code>fill_bytes</code></a> consume a whole number of <code>u32</code> or <code>u64</code>
values and drop any remaining unused bytes.</p>
<p>The <a href="trait.RngCore.html#tymethod.try_fill_bytes"><code>try_fill_bytes</code></a> method is a variant of <a href="trait.RngCore.html#tymethod.fill_bytes"><code>fill_bytes</code></a> allowing error
handling; it is not deemed sufficiently useful to add equivalents for
<a href="trait.RngCore.html#tymethod.next_u32"><code>next_u32</code></a> or <a href="trait.RngCore.html#tymethod.next_u64"><code>next_u64</code></a> since the latter methods are almost always used
with algorithmic generators (PRNGs), which are normally infallible.</p>
<p>Algorithmic generators implementing <a href="trait.SeedableRng.html"><code>SeedableRng</code></a> should normally have
<em>portable, reproducible</em> output, i.e. fix Endianness when converting values
to avoid platform differences, and avoid making any changes which affect
output (except by communicating that the release has breaking changes).</p>
<p>Typically implementators will implement only one of the methods available
in this trait directly, then use the helper functions from the
<a href="../rand_core/impls/index.html"><code>rand_core::impls</code></a> module to implement the other methods.</p>
<p>It is recommended that implementations also implement:</p>
<ul>
<li><code>Debug</code> with a custom implementation which <em>does not</em> print any internal
state (at least, <a href="trait.CryptoRng.html"><code>CryptoRng</code></a>s should not risk leaking state through
<code>Debug</code>).</li>
<li><code>Serialize</code> and <code>Deserialize</code> (from Serde), preferably making Serde
support optional at the crate level in PRNG libs.</li>
<li><code>Clone</code>, if possible.</li>
<li><em>never</em> implement <code>Copy</code> (accidental copies may cause repeated values).</li>
<li><em>do not</em> implement <code>Default</code> for pseudorandom generators, but instead
implement <a href="trait.SeedableRng.html"><code>SeedableRng</code></a>, to guide users towards proper seeding.
External / hardware RNGs can choose to implement <code>Default</code>.</li>
<li><code>Eq</code> and <code>PartialEq</code> could be implemented, but are probably not useful.</li>
</ul>
<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
<p>A simple example, obviously not generating very <em>random</em> output:</p>
<pre class="rust rust-example-rendered">
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="kw">use</span> <span class="ident">rand_core</span>::{<span class="ident">RngCore</span>, <span class="ident">Error</span>, <span class="ident">impls</span>};
<span class="kw">struct</span> <span class="ident">CountingRng</span>(<span class="ident">u64</span>);
<span class="kw">impl</span> <span class="ident">RngCore</span> <span class="kw">for</span> <span class="ident">CountingRng</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">next_u64</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="number">0</span> <span class="op">+=</span> <span class="number">1</span>;
<span class="self">self</span>.<span class="number">0</span>
}
<span class="kw">fn</span> <span class="ident">fill_bytes</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">dest</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) {
<span class="ident">impls</span>::<span class="ident">fill_bytes_via_next</span>(<span class="self">self</span>, <span class="ident">dest</span>)
}
<span class="kw">fn</span> <span class="ident">try_fill_bytes</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">dest</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Error</span><span class="op">&gt;</span> {
<span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">fill_bytes</span>(<span class="ident">dest</span>))
}
}</pre>
</div>
<h2 id='required-methods' class='small-section-header'>
Required Methods<a href='#required-methods' class='anchor'></a>
</h2>
<div class='methods'>
<h3 id='tymethod.next_u32' class='method'><span id='next_u32.v' class='invisible'><code>fn <a href='#tymethod.next_u32' class='fnname'>next_u32</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></span></h3><div class='docblock'><p>Return the next random <code>u32</code>.</p>
<p>RNGs must implement at least one method from this trait directly. In
the case this method is not implemented directly, it can be implemented
using <code>self.next_u64() as u32</code> or
<a href="../rand_core/impls/fn.next_u32_via_fill.html">via <code>fill_bytes</code></a>.</p>
</div><h3 id='tymethod.next_u64' class='method'><span id='next_u64.v' class='invisible'><code>fn <a href='#tymethod.next_u64' class='fnname'>next_u64</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a></code></span></h3><div class='docblock'><p>Return the next random <code>u64</code>.</p>
<p>RNGs must implement at least one method from this trait directly. In
the case this method is not implemented directly, it can be implemented
<a href="../rand_core/impls/fn.next_u64_via_u32.html">via <code>next_u32</code></a> or
<a href="../rand_core/impls/fn.next_u64_via_fill.html">via <code>fill_bytes</code></a>.</p>
</div><h3 id='tymethod.fill_bytes' class='method'><span id='fill_bytes.v' class='invisible'><code>fn <a href='#tymethod.fill_bytes' class='fnname'>fill_bytes</a>(&amp;mut self, dest: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>)</code></span></h3><div class='docblock'><p>Fill <code>dest</code> with random data.</p>
<p>RNGs must implement at least one method from this trait directly. In
the case this method is not implemented directly, it can be implemented
<a href="../rand_core/impls/fn.fill_bytes_via_next.html">via <code>next_u*</code></a> or
via <code>try_fill_bytes</code>; if this generator can fail the implementation
must choose how best to handle errors here (e.g. panic with a
descriptive message or log a warning and retry a few times).</p>
<p>This method should guarantee that <code>dest</code> is entirely filled
with new data, and may panic if this is impossible
(e.g. reading past the end of a file that is being used as the
source of randomness).</p>
</div><h3 id='tymethod.try_fill_bytes' class='method'><span id='try_fill_bytes.v' class='invisible'><code>fn <a href='#tymethod.try_fill_bytes' class='fnname'>try_fill_bytes</a>(&amp;mut self, dest: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&gt;</code></span></h3><div class='docblock'><p>Fill <code>dest</code> entirely with random data.</p>
<p>This is the only method which allows an RNG to report errors while
generating random data thus making this the primary method implemented
by external (true) RNGs (e.g. <code>OsRng</code>) which can fail. It may be used
directly to generate keys and to seed (infallible) PRNGs.</p>
<p>Other than error handling, this method is identical to <a href="trait.RngCore.html#method.fill_bytes"><code>fill_bytes</code></a>;
thus this may be implemented using <code>Ok(self.fill_bytes(dest))</code> or
<code>fill_bytes</code> may be implemented with
<code>self.try_fill_bytes(dest).unwrap()</code> or more specific error handling.</p>
</div></div><h2 id='implementations' class='small-section-header'>Trait Implementations<a href='#implementations' class='anchor'></a></h2><div id='implementations-list'><h3 id='impl-Read' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a> + 'static</code><a href='#impl-Read' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand_core/lib.rs.html#431-436' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.read' class="method"><span id='read.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Read.html#tymethod.read' class='fnname'>read</a>(&amp;mut self, buf: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand_core/lib.rs.html#432-435' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Pull some bytes from this source into the specified buffer, returning how many bytes were read. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html#tymethod.read">Read more</a></p>
</div><h4 id='method.initializer' class="method"><span id='initializer.v' class='invisible'><table class='table-display'><tbody><tr><td><code>unsafe fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.initializer' class='fnname'>initializer</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Initializer.html" title="struct std::io::Initializer">Initializer</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#552-554' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>read_initializer</code>)</div></div><div class='docblock'><p>Determines if this <code>Read</code>er can work with buffers of uninitialized memory. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.initializer">Read more</a></p>
</div><h4 id='method.read_to_end' class="method"><span id='read_to_end.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end' class='fnname'>read_to_end</a>(&amp;mut self, buf: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#604-606' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Read all bytes until EOF in this source, placing them into <code>buf</code>. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end">Read more</a></p>
</div><h4 id='method.read_to_string' class="method"><span id='read_to_string.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_string' class='fnname'>read_to_string</a>(&amp;mut self, buf: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#647-658' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Read all bytes until EOF in this source, appending them to <code>buf</code>. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_string">Read more</a></p>
</div><h4 id='method.read_exact' class="method"><span id='read_exact.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact' class='fnname'>read_exact</a>(&amp;mut self, buf: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.6.0'>1.6.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#710-725' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Read the exact number of bytes required to fill <code>buf</code>. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact">Read more</a></p>
</div><h4 id='method.by_ref' class="method"><div class="important-traits"><div class='tooltip'><span class='tooltiptext'>Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut </a>W</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut </a>W</h3><code class="content"><span class="where fmt-newline">impl&lt;'a, W&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut </a>W <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></span><span class="where fmt-newline">impl&lt;'a, R&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut </a>R <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></span><span class="where fmt-newline">impl&lt;'a, I&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut </a>I <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = &lt;I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a>&gt;::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::iterator::Iterator::Item">Item</a>;</span></code></div></div><span id='by_ref.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.by_ref' class='fnname'>by_ref</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>Self</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#762' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates a &quot;by reference&quot; adaptor for this instance of <code>Read</code>. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.by_ref">Read more</a></p>
</div><h4 id='method.bytes' class="method"><div class="important-traits"><div class='tooltip'><span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Bytes.html" title="struct std::io::Bytes">Bytes</a>&lt;R&gt;</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Bytes.html" title="struct std::io::Bytes">Bytes</a>&lt;R&gt;</h3><code class="content"><span class="where fmt-newline">impl&lt;R&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Bytes.html" title="struct std::io::Bytes">Bytes</a>&lt;R&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a>,&nbsp;</span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;;</span></code></div></div><span id='bytes.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.bytes' class='fnname'>bytes</a>(self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Bytes.html" title="struct std::io::Bytes">Bytes</a>&lt;Self&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#799-801' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Transforms this <code>Read</code> instance to an [<code>Iterator</code>] over its bytes. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.bytes">Read more</a></p>
</div><h4 id='method.chars' class="method"><div class="important-traits"><div class='tooltip'><span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Chars.html" title="struct std::io::Chars">Chars</a>&lt;R&gt;</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Chars.html" title="struct std::io::Chars">Chars</a>&lt;R&gt;</h3><code class="content"><span class="where fmt-newline">impl&lt;R&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Chars.html" title="struct std::io::Chars">Chars</a>&lt;R&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a>,&nbsp;</span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</a>, <a class="enum" href="https://doc.rust-lang.org/nightly/std/io/enum.CharsError.html" title="enum std::io::CharsError">CharsError</a>&gt;;</span></code></div></div><span id='chars.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.chars' class='fnname'>chars</a>(self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Chars.html" title="struct std::io::Chars">Chars</a>&lt;Self&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#846-848' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='stability'><div class='stab deprecated'>Deprecated since 1.27.0<p>: Use str::from_utf8 instead:
https://doc.rust-lang.org/nightly/std/str/struct.Utf8Error.html#examples</p>
</div><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>io</code>)</summary><p>the semantics of a partial read/write of where errors happen is currently unclear and may change</p>
</details></div></div><div class='docblock'><p>Transforms this <code>Read</code> instance to an [<code>Iterator</code>] over [<code>char</code>]s. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.chars">Read more</a></p>
</div><h4 id='method.chain' class="method"><div class="important-traits"><div class='tooltip'><span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a>&lt;T, U&gt;</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a>&lt;T, U&gt;</h3><code class="content"><span class="where fmt-newline">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a>&lt;T, U&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a>,&nbsp;</span></span></code></div></div><span id='chain.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.chain' class='fnname'>chain</a>&lt;R&gt;(self, next: R) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a>&lt;Self, R&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a>,&nbsp;</span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#881-883' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates an adaptor which will chain this stream with another. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.chain">Read more</a></p>
</div><h4 id='method.take' class="method"><div class="important-traits"><div class='tooltip'><span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Take.html" title="struct std::io::Take">Take</a>&lt;T&gt;</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Take.html" title="struct std::io::Take">Take</a>&lt;T&gt;</h3><code class="content"><span class="where fmt-newline">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Take.html" title="struct std::io::Take">Take</a>&lt;T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a>,&nbsp;</span></span></code></div></div><span id='take.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.take' class='fnname'>take</a>(self, limit: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/struct.Take.html" title="struct std::io::Take">Take</a>&lt;Self&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/io/mod.rs.html#917-919' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates an adaptor which will read at most <code>limit</code> bytes from it. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.take">Read more</a></p>
</div></div></div>
<h2 id='foreign-impls' class='small-section-header'>
Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
</h2>
<h3 id='impl-RngCore' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;R&gt; <a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;R&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></code><a href='#impl-RngCore' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand_core/lib.rs.html#408-428' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'><h4 id='method.next_u32' class="method"><span id='next_u32.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.next_u32' class='fnname'>next_u32</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand_core/lib.rs.html#410-412' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.next_u64' class="method"><span id='next_u64.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.next_u64' class='fnname'>next_u64</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand_core/lib.rs.html#415-417' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.fill_bytes' class="method"><span id='fill_bytes.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.fill_bytes' class='fnname'>fill_bytes</a>(&amp;mut self, dest: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand_core/lib.rs.html#420-422' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.try_fill_bytes' class="method"><span id='try_fill_bytes.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.try_fill_bytes' class='fnname'>try_fill_bytes</a>(&amp;mut self, dest: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand_core/lib.rs.html#425-427' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4></div></span><h3 id='impl-RngCore-1' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;R&gt; <a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a> for <a class="struct" href="../rand_core/block/struct.BlockRng.html" title="struct rand_core::block
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/prng/hc128/struct.Hc128Rng.html" title="struct rand::prng::hc128::Hc128Rng">Hc128Rng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/hc128.rs.html#74-92' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/prng/isaac/struct.IsaacRng.html" title="struct rand::prng::isaac::IsaacRng">IsaacRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/isaac.rs.html#97-115' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/prng/isaac64/struct.Isaac64Rng.html" title="struct rand::prng::isaac64::Isaac64Rng">Isaac64Rng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/isaac64.rs.html#87-105' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/prng/struct.XorShiftRng.html" title="struct rand::prng::XorShiftRng">XorShiftRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/xorshift.rs.html#60-86' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl&lt;R:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a>&gt; RngCore for <a class="struct" href="../rand/rngs/adapter/struct.ReadRng.html" title="struct rand::rngs::adapter::ReadRng">ReadRng</a>&lt;R&gt;</code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/adapter/read.rs.html#60-87' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl&lt;R, Rsdr:&nbsp;<a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a>&gt; RngCore for <a class="struct" href="../rand/rngs/adapter/struct.ReseedingRng.html" title="struct rand::rngs::adapter::ReseedingRng">ReseedingRng</a>&lt;R, Rsdr&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="../rand_core/block/trait.BlockRngCore.html" title="trait rand_core::block::BlockRngCore">BlockRngCore</a>&lt;Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>&gt; + <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;R as <a class="trait" href="../rand_core/block/trait.BlockRngCore.html" title="trait rand_core::block::BlockRngCore">BlockRngCore</a>&gt;::<a class="type" href="../rand_core/block/trait.BlockRngCore.html#associatedtype.Results" title="type rand_core::block::BlockRngCore::Results">Results</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsMut.html" title="trait core::convert::AsMut">AsMut</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>&gt;,&nbsp;</span></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/adapter/reseeding.rs.html#85-106' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/rngs/struct.EntropyRng.html" title="struct rand::rngs::EntropyRng">EntropyRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/entropy.rs.html#78-163' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/jitter.rs.html#825-855' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/rngs/mock/struct.StepRng.html" title="struct rand::rngs::mock::StepRng">StepRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/mock.rs.html#43-61' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/rngs/struct.SmallRng.html" title="struct rand::rngs::SmallRng">SmallRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/small.rs.html#71-89' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/rngs/struct.StdRng.html" title="struct rand::rngs::StdRng">StdRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/std.rs.html#33-51' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/rngs/struct.ThreadRng.html" title="struct rand::rngs::ThreadRng">ThreadRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/thread.rs.html#104-122' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl RngCore for <a class="struct" href="../rand/rngs/struct.OsRng.html" title="struct rand::rngs::OsRng">OsRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/os.rs.html#135-217' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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