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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 `SeedableRng` trait in crate `rand`."><meta name="keywords" content="rust, rustlang, rust-lang, SeedableRng"><title>rand::SeedableRng - 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 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'><div class='logo-container'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk.png' alt='logo'></div></a><p class='location'>Trait SeedableRng</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Seed">Seed</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.from_seed">from_seed</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.from_rng">from_rng</a><a href="#method.seed_from_u64">seed_from_u64</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-SeedableRng-for-BlockRng%3CR%3E">BlockRng&lt;R&gt;</a><a href="#impl-SeedableRng-for-BlockRng64%3CR%3E">BlockRng64&lt;R&gt;</a><a href="#impl-SeedableRng-for-ChaChaCore">ChaChaCore</a><a href="#impl-SeedableRng-for-ChaChaRng">ChaChaRng</a><a href="#impl-SeedableRng-for-Hc128Core">Hc128Core</a><a href="#impl-SeedableRng-for-Hc128Rng">Hc128Rng</a><a href="#impl-SeedableRng-for-Isaac64Core">Isaac64Core</a><a href="#impl-SeedableRng-for-Isaac64Rng">Isaac64Rng</a><a href="#impl-SeedableRng-for-IsaacCore">IsaacCore</a><a href="#impl-SeedableRng-for-IsaacRng">IsaacRng</a><a href="#impl-SeedableRng-for-Lcg64Xsh32">Lcg64Xsh32</a><a href="#impl-SeedableRng-for-Mcg128Xsl64">Mcg128Xsl64</a><a href="#impl-SeedableRng-for-XorShiftRng">XorShiftRng</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>rand</a></p><script>window.sidebarCurrent = {name: 'SeedableRng', 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"><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'>&#x2212;</span>]</a></span><a class='srclink' href='../src/rand_core/lib.rs.html#221-368' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='index.html'>rand</a>
type <a href='#associatedtype.Seed' class="type">Seed</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a> + <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.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>&gt;;
fn <a href='#tymethod.from_seed' class='fnname'>from_seed</a>(seed: Self::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; Self;
fn <a href='#method.seed_from_u64' class='fnname'>seed_from_u64</a>(state: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&gt; Self { ... }
<div class='item-spacer'></div> fn <a href='#method.from_rng' class='fnname'>from_rng</a>&lt;R&gt;(rng: R) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a></span>,
{ ... }
}</pre></div><div class='docblock'><p>A random number generator that can be explicitly seeded.</p>
<p>This trait encapsulates the low-level functionality common to all
pseudo-random number generators (PRNGs, or algorithmic generators).</p>
<p>The <code>FromEntropy</code> trait from the <a href="https://docs.rs/rand"><code>rand</code></a> crate is automatically
implemented for every type implementing <code>SeedableRng</code>, providing
a convenient <code>from_entropy()</code> constructor.</p>
</div>
<h2 id='associated-types' class='small-section-header'>Associated Types<a href='#associated-types' class='anchor'></a></h2><div class='methods'><h3 id='associatedtype.Seed' class='method'><code id='Seed.t'>type <a href='#associatedtype.Seed' class="type">Seed</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a> + <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.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>&gt;</code></h3><div class='docblock'><p>Seed type, which is restricted to types mutably-dereferencable as <code>u8</code>
arrays (we recommend <code>[u8; N]</code> for some <code>N</code>).</p>
<p>It is recommended to seed PRNGs with a seed of at least circa 100 bits,
which means an array of <code>[u8; 12]</code> or greater to avoid picking RNGs with
partially overlapping periods.</p>
<p>For cryptographic RNG's a seed of 256 bits is recommended, <code>[u8; 32]</code>.</p>
<h1 id="implementing-seedablerng-for-rngs-with-large-seeds" class="section-header"><a href="#implementing-seedablerng-for-rngs-with-large-seeds">Implementing <code>SeedableRng</code> for RNGs with large seeds</a></h1>
<p>Note that the required traits <code>core::default::Default</code> and
<code>core::convert::AsMut&lt;u8&gt;</code> are not implemented for large arrays
<code>[u8; N]</code> with <code>N</code> &gt; 32. To be able to implement the traits required by
<code>SeedableRng</code> for RNGs with such large seeds, the newtype pattern can be
used:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">rand_core</span>::<span class="ident">SeedableRng</span>;
<span class="kw">const</span> <span class="ident">N</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">64</span>;
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MyRngSeed</span>(<span class="kw">pub</span> [<span class="ident">u8</span>; <span class="ident">N</span>]);
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MyRng</span>(<span class="ident">MyRngSeed</span>);
<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">MyRngSeed</span> {
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MyRngSeed</span> {
<span class="ident">MyRngSeed</span>([<span class="number">0</span>; <span class="ident">N</span>])
}
}
<span class="kw">impl</span> <span class="ident">AsMut</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">MyRngSeed</span> {
<span class="kw">fn</span> <span class="ident">as_mut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>] {
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="number">0</span>
}
}
<span class="kw">impl</span> <span class="ident">SeedableRng</span> <span class="kw">for</span> <span class="ident">MyRng</span> {
<span class="kw">type</span> <span class="ident">Seed</span> <span class="op">=</span> <span class="ident">MyRngSeed</span>;
<span class="kw">fn</span> <span class="ident">from_seed</span>(<span class="ident">seed</span>: <span class="ident">MyRngSeed</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MyRng</span> {
<span class="ident">MyRng</span>(<span class="ident">seed</span>)
}
}</pre></div>
</div></div><span class='loading-content'>Loading content...</span>
<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.from_seed' class='method'><code id='from_seed.v'>fn <a href='#tymethod.from_seed' class='fnname'>from_seed</a>(seed: Self::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; Self</code></h3><div class='docblock'><p>Create a new PRNG using the given seed.</p>
<p>PRNG implementations are allowed to assume that bits in the seed are
well distributed. That means usually that the number of one and zero
bits are about equal, and values like 0, 1 and (size - 1) are unlikely.</p>
<p>PRNG implementations are recommended to be reproducible. A PRNG seeded
using this function with a fixed seed should produce the same sequence
of output in the future and on different architectures (with for example
different endianness).</p>
<p>It is however not required that this function yield the same state as a
reference implementation of the PRNG given equivalent seed; if necessary
another constructor replicating behaviour from a reference
implementation can be added.</p>
<p>PRNG implementations should make sure <code>from_seed</code> never panics. In the
case that some special values (like an all zero seed) are not viable
seeds it is preferable to map these to alternative constant value(s),
for example <code>0xBAD5EEDu32</code> or <code>0x0DDB1A5E5BAD5EEDu64</code> (&quot;odd biases? bad
seed&quot;). This is assuming only a small number of values must be rejected.</p>
</div></div><span class='loading-content'>Loading content...</span>
<h2 id='provided-methods' class='small-section-header'>Provided methods<a href='#provided-methods' class='anchor'></a></h2><div class='methods'><h3 id='method.seed_from_u64' class='method'><code id='seed_from_u64.v'>fn <a href='#method.seed_from_u64' class='fnname'>seed_from_u64</a>(state: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&gt; Self</code></h3><div class='docblock'><p>Create a new PRNG using a <code>u64</code> seed.</p>
<p>This is a convenience-wrapper around <code>from_seed</code> to allow construction
of any <code>SeedableRng</code> from a simple <code>u64</code> value. It is designed such that
low Hamming Weight numbers like 0 and 1 can be used and should still
result in good, independent seeds to the PRNG which is returned.</p>
<p>This <strong>is not suitable for cryptography</strong>, as should be clear given that
the input size is only 64 bits.</p>
<p>Implementations for PRNGs <em>may</em> provide their own implementations of
this function, but the default implementation should be good enough for
all purposes. <em>Changing</em> the implementation of this function should be
considered a value-breaking change.</p>
</div><h3 id='method.from_rng' class='method'><code id='from_rng.v'>fn <a href='#method.from_rng' class='fnname'>from_rng</a>&lt;R&gt;(rng: R) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&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>,&nbsp;</span></code></h3><div class='docblock'><p>Create a new PRNG seeded from another <code>Rng</code>.</p>
<p>This is the recommended way to initialize PRNGs with fresh entropy. The
<code>FromEntropy</code> trait from the <a href="https://docs.rs/rand"><code>rand</code></a> crate provides a convenient
<code>from_entropy</code> method based on <code>from_rng</code>.</p>
<p>Usage of this method is not recommended when reproducibility is required
since implementing PRNGs are not required to fix Endianness and are
allowed to modify implementations in new releases.</p>
<p>It is important to use a good source of randomness to initialize the
PRNG. Cryptographic PRNG may be rendered insecure when seeded from a
non-cryptographic PRNG or with insufficient entropy.
Many non-cryptographic PRNGs will show statistical bias in their first
results if their seed numbers are small or if there is a simple pattern
between them.</p>
<p>Prefer to seed from a strong external entropy source like <code>OsRng</code> from
the <a href="https://docs.rs/rand_os"><code>rand_os</code></a> crate or from a cryptographic PRNG; if creating a new
generator for cryptographic uses you <em>must</em> seed from a strong source.</p>
<p>Seeding a small PRNG from another small PRNG is possible, but
something to be careful with. An extreme example of how this can go
wrong is seeding an Xorshift RNG from another Xorshift RNG, which
will effectively clone the generator. In general seeding from a
generator which is hard to predict is probably okay.</p>
<p>PRNG implementations are allowed to assume that a good RNG is provided
for seeding, and that it is cryptographically secure when appropriate.</p>
</div></div><span class='loading-content'>Loading content...</span>
<h2 id='foreign-impls' class='small-section-header'>Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a></h2><h3 id='impl-SeedableRng-for-BlockRng%3CR%3E' class='impl'><code class='in-band'>impl&lt;R&gt; <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> for <a class="struct" href="../rand_core/block/struct.BlockRng.html" title="struct rand_core::block::BlockRng">BlockRng</a>&lt;R&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> + <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>,&nbsp;</span></code><a href='#impl-SeedableRng-for-BlockRng%3CR%3E' class='anchor'></a><a class='srclink' href='../src/rand_core/block.rs.html#275-289' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Seed-1' class="type"><code id='Seed.t-1'>type <a href='#associatedtype.Seed' class="type">Seed</a> = &lt;R as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a></code></h4><h4 id='method.from_seed' class="method hidden"><code id='from_seed.v-1'>fn <a href='#method.from_seed' class='fnname'>from_seed</a>(seed: &lt;<a class="struct" href="../rand_core/block/struct.BlockRng.html" title="struct rand_core::block::BlockRng">BlockRng</a>&lt;R&gt; as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; <a class="struct" href="../rand_core/block/struct.BlockRng.html" title="struct rand_core::block::BlockRng">BlockRng</a>&lt;R&gt;</code><a class='srclink' href='../src/rand_core/block.rs.html#278-280' title='goto source code'>[src]</a></h4><h4 id='method.seed_from_u64-1' class="method hidden"><code id='seed_from_u64.v-1'>fn <a href='#method.seed_from_u64' class='fnname'>seed_from_u64</a>(seed: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&gt; <a class="struct" href="../rand_core/block/struct.BlockRng.html" title="struct rand_core::block::BlockRng">BlockRng</a>&lt;R&gt;</code><a class='srclink' href='../src/rand_core/block.rs.html#282-284' title='goto source code'>[src]</a></h4><h4 id='method.from_rng-1' class="method hidden"><code id='from_rng.v-1'>fn <a href='#method.from_rng' class='fnname'>from_rng</a>&lt;S&gt;(rng: S) -&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="struct" href="../rand_core/block/struct.BlockRng.html" title="struct rand_core::block::BlockRng">BlockRng</a>&lt;R&gt;, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;S: <a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a>,&nbsp;</span></code><a class='srclink' href='../src/rand_core/block.rs.html#286-288' title='goto source code'>[src]</a></h4></div><h3 id='impl-SeedableRng-for-BlockRng64%3CR%3E' class='impl'><code class='in-band'>impl&lt;R&gt; <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> for <a class="struct" href="../rand_core/block/struct.BlockRng64.html" title="struct rand_core::block::BlockRng64">BlockRng64</a>&lt;R&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> + <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>,&nbsp;</span></code><a href='#impl-SeedableRn
If <code>seed == 0</code> this will produce the same stream of random numbers as
the reference implementation when used unseeded.</p>
</div><h4 id='method.from_rng-3' class="method hidden"><code id='from_rng.v-3'>fn <a href='#method.from_rng' class='fnname'>from_rng</a>&lt;R&gt;(rng: R) -&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="struct" href="../rand_isaac/isaac/struct.IsaacCore.html" title="struct rand_isaac::isaac::IsaacCore">IsaacCore</a>, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&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>,&nbsp;</span></code><a class='srclink' href='../src/rand_isaac/isaac.rs.html#344-359' title='goto source code'>[src]</a></h4></div><h3 id='impl-SeedableRng-for-IsaacRng' class='impl'><code class='in-band'>impl <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> for <a class="struct" href="../rand_isaac/isaac/struct.IsaacRng.html" title="struct rand_isaac::isaac::IsaacRng">IsaacRng</a></code><a href='#impl-SeedableRng-for-IsaacRng' class='anchor'></a><a class='srclink' href='../src/rand_isaac/isaac.rs.html#116-133' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Seed-4' class="type"><code id='Seed.t-4'>type <a href='#associatedtype.Seed' class="type">Seed</a> = &lt;<a class="struct" href="../rand_isaac/isaac/struct.IsaacCore.html" title="struct rand_isaac::isaac::IsaacCore">IsaacCore</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a></code></h4><h4 id='method.from_seed-3' class="method hidden"><code id='from_seed.v-4'>fn <a href='#method.from_seed' class='fnname'>from_seed</a>(seed: &lt;<a class="struct" href="../rand_isaac/isaac/struct.IsaacRng.html" title="struct rand_isaac::isaac::IsaacRng">IsaacRng</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; <a class="struct" href="../rand_isaac/isaac/struct.IsaacRng.html" title="struct rand_isaac::isaac::IsaacRng">IsaacRng</a></code><a class='srclink' href='../src/rand_isaac/isaac.rs.html#119-121' title='goto source code'>[src]</a></h4><h4 id='method.seed_from_u64-4' class="method"><code id='seed_from_u64.v-4'>fn <a href='#method.seed_from_u64' class='fnname'>seed_from_u64</a>(seed: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&gt; <a class="struct" href="../rand_isaac/isaac/struct.IsaacRng.html" title="struct rand_isaac::isaac::IsaacRng">IsaacRng</a></code><a class='srclink' href='../src/rand_isaac/isaac.rs.html#126-128' title='goto source code'>[src]</a></h4><div class='docblock'><p>Create an ISAAC random number generator using an <code>u64</code> as seed.
If <code>seed == 0</code> this will produce the same stream of random numbers as
the reference implementation when used unseeded.</p>
</div><h4 id='method.from_rng-4' class="method hidden"><code id='from_rng.v-4'>fn <a href='#method.from_rng' class='fnname'>from_rng</a>&lt;S&gt;(rng: S) -&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="struct" href="../rand_isaac/isaac/struct.IsaacRng.html" title="struct rand_isaac::isaac::IsaacRng">IsaacRng</a>, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;S: <a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a>,&nbsp;</span></code><a class='srclink' href='../src/rand_isaac/isaac.rs.html#130-132' title='goto source code'>[src]</a></h4></div><h3 id='impl-SeedableRng-for-Isaac64Rng' class='impl'><code class='in-band'>impl <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> for <a class="struct" href="../rand_isaac/isaac64/struct.Isaac64Rng.html" title="struct rand_isaac::isaac64::Isaac64Rng">Isaac64Rng</a></code><a href='#impl-SeedableRng-for-Isaac64Rng' class='anchor'></a><a class='srclink' href='../src/rand_isaac/isaac64.rs.html#106-123' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Seed-5' class="type"><code id='Seed.t-5'>type <a href='#associatedtype.Seed' class="type">Seed</a> = &lt;<a class="struct" href="../rand_isaac/isaac64/struct.Isaac64Core.html" title="struct rand_isaac::isaac64::Isaac64Core">Isaac64Core</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a></code></h4><h4 id='method.from_seed-4' class="method hidden"><code id='from_seed.v-5'>fn <a href='#method.from_seed' class='fnname'>from_seed</a>(seed: &lt;<a class="struct" href="../rand_isaac/isaac64/struct.Isaac64Rng.html" title="struct rand_isaac::isaac64::Isaac64Rng">Isaac64Rng</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; <a class="struct" href="../rand_isaac/isaac64/struct.Isaac64Rng.html" title="struct rand_isaac::isaac64::Isaac64Rng">Isaac64Rng</a></code><a class='srclink' href='../src/rand_isaac/isaac64.rs.html#109-111' title='goto source code'>[src]</a></h4><h4 id='method.seed_from_u64-5' class="method"><code id='seed_from_u64.v-5'>fn <a href='#method.seed_from_u64' class='fnname'>seed_from_u64</a>(seed: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&gt; <a class="struct" href="../rand_isaac/isaac64/struct.Isaac64Rng.html" title="struct rand_isaac::isaac64::Isaac64Rng">Isaac64Rng</a></code><a class='srclink' href='../src/rand_isaac/isaac64.rs.html#116-118' title='goto source code'>[src]</a></h4><div class='docblock'><p>Create an ISAAC random number generator using an <code>u64</code> as seed.
If <code>seed == 0</code> this will produce the same stream of random numbers as
the reference implementation when used unseeded.</p>
</div><h4 id='method.from_rng-5' class="method hidden"><code id='from_rng.v-5'>fn <a href='#method.from_rng' class='fnname'>from_rng</a>&lt;S&gt;(rng: S) -&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="struct" href="../rand_isaac/isaac64/struct.Isaac64Rng.html" title="struct rand_isaac::isaac64::Isaac64Rng">Isaac64Rng</a>, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;S: <a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a>,&nbsp;</span></code><a class='srclink' href='../src/rand_isaac/isaac64.rs.html#120-122' title='goto source code'>[src]</a></h4></div><h3 id='impl-SeedableRng-for-Isaac64Core' class='impl'><code class='in-band'>impl <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> for <a class="struct" href="../rand_isaac/isaac64/struct.Isaac64Core.html" title="struct rand_isaac::isaac64::Isaac64Core">Isaac64Core</a></code><a href='#impl-SeedableRng-for-Isaac64Core' class='anchor'></a><a class='srclink' href='../src/rand_isaac/isaac64.rs.html#287-328' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Seed-6' class="type"><code id='Seed.t-6'>type <a href='#associatedtype.Seed' class="type">Seed</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</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.array.html">; 32]</a></code></h4><h4 id='method.from_seed-5' class="method hidden"><code id='from_seed.v-6'>fn <a href='#method.from_seed' class='fnname'>from_seed</a>(seed: &lt;<a class="struct" href="../rand_isaac/isaac64/struct.Isaac64Core.html" title="struct rand_isaac::isaac64::Isaac64Core">Isaac64Core</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; <a class="struct" href="../rand_isaac/isaac64/struct.Isaac64Core.html" title="struct rand_isaac::isaac64::Isaac64Core">Isaac64Core</a></code><a class='srclink' href='../src/rand_isaac/isaac64.rs.html#290-299' title='goto source code'>[src]</a></h4><h4 id='method.seed_from_u64-6' class="method hidden"><code id='seed_from_u64.v-6'>fn <a href='#method.seed_from_u64' class='fnname'>seed_from_u64</a>(seed: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&gt; <a class="struct" href="../rand_isaac/isaac64/struct.Isaac64Core.html" title="struct rand_isaac::isaac64::Isaac64Core">Isaac64Core</a></code><a class='srclink' href='../src/rand_isaac/isaac64.rs.html#301-311' title='goto source code'>[src]</a></h4><h4 id='method.from_rng-6' class="method hidden"><code id='from_rng.v-6'>fn <a href='#method.from_rng' class='fnname'>from_rng</a>&lt;R&gt;(rng: R) -&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="struct" href="../rand_isaac/isaac64/struct.Isaac64Core.html" title="struct rand_isaac::isaac64::Isaac64Core">Isaac64Core</a>, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&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>,&nbsp;</span></code><a class='srclink' href='../src/rand_isaac/isaac64.rs.html#313-327' title='goto source code'>[src]</a></h4></div><h3 id='impl-SeedableRng-for-ChaChaCore' class='impl'><code class='in-band'>impl <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> for <a class="struct" href="../rand_chacha/chacha/struct.ChaChaCore.html" title="st
256 bits in length, matching the 128 bit <code>key</code> followed by 128 bit <code>iv</code>
when HC-128 where to be used as a stream cipher.</p>
</div></div><h3 id='impl-SeedableRng-for-Hc128Rng' class='impl'><code class='in-band'>impl <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> for <a class="struct" href="../rand_hc/hc128/struct.Hc128Rng.html" title="struct rand_hc::hc128::Hc128Rng">Hc128Rng</a></code><a href='#impl-SeedableRng-for-Hc128Rng' class='anchor'></a><a class='srclink' href='../src/rand_hc/hc128.rs.html#92-102' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Seed-10' class="type"><code id='Seed.t-10'>type <a href='#associatedtype.Seed' class="type">Seed</a> = &lt;<a class="struct" href="../rand_hc/hc128/struct.Hc128Core.html" title="struct rand_hc::hc128::Hc128Core">Hc128Core</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a></code></h4><h4 id='method.from_seed-9' class="method hidden"><code id='from_seed.v-10'>fn <a href='#method.from_seed' class='fnname'>from_seed</a>(seed: &lt;<a class="struct" href="../rand_hc/hc128/struct.Hc128Rng.html" title="struct rand_hc::hc128::Hc128Rng">Hc128Rng</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; <a class="struct" href="../rand_hc/hc128/struct.Hc128Rng.html" title="struct rand_hc::hc128::Hc128Rng">Hc128Rng</a></code><a class='srclink' href='../src/rand_hc/hc128.rs.html#95-97' title='goto source code'>[src]</a></h4><h4 id='method.from_rng-8' class="method hidden"><code id='from_rng.v-8'>fn <a href='#method.from_rng' class='fnname'>from_rng</a>&lt;R&gt;(rng: R) -&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="struct" href="../rand_hc/hc128/struct.Hc128Rng.html" title="struct rand_hc::hc128::Hc128Rng">Hc128Rng</a>, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&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>,&nbsp;</span></code><a class='srclink' href='../src/rand_hc/hc128.rs.html#99-101' title='goto source code'>[src]</a></h4></div><h3 id='impl-SeedableRng-for-Lcg64Xsh32' class='impl'><code class='in-band'>impl <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> for <a class="struct" href="../rand_pcg/pcg64/struct.Lcg64Xsh32.html" title="struct rand_pcg::pcg64::Lcg64Xsh32">Lcg64Xsh32</a></code><a href='#impl-SeedableRng-for-Lcg64Xsh32' class='anchor'></a><a class='srclink' href='../src/rand_pcg/pcg64.rs.html#82-92' title='goto source code'>[src]</a></h3><div class='docblock'><p>We use a single 127-bit seed to initialise the state and select a stream.
One <code>seed</code> bit (lowest bit of <code>seed[8]</code>) is ignored.</p>
</div><div class='impl-items'><h4 id='associatedtype.Seed-11' class="type"><code id='Seed.t-11'>type <a href='#associatedtype.Seed' class="type">Seed</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</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.array.html">; 16]</a></code></h4><h4 id='method.from_seed-10' class="method hidden"><code id='from_seed.v-11'>fn <a href='#method.from_seed' class='fnname'>from_seed</a>(seed: &lt;<a class="struct" href="../rand_pcg/pcg64/struct.Lcg64Xsh32.html" title="struct rand_pcg::pcg64::Lcg64Xsh32">Lcg64Xsh32</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; <a class="struct" href="../rand_pcg/pcg64/struct.Lcg64Xsh32.html" title="struct rand_pcg::pcg64::Lcg64Xsh32">Lcg64Xsh32</a></code><a class='srclink' href='../src/rand_pcg/pcg64.rs.html#85-91' title='goto source code'>[src]</a></h4></div><h3 id='impl-SeedableRng-for-Mcg128Xsl64' class='impl'><code class='in-band'>impl <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> for <a class="struct" href="../rand_pcg/pcg128/struct.Mcg128Xsl64.html" title="struct rand_pcg::pcg128::Mcg128Xsl64">Mcg128Xsl64</a></code><a href='#impl-SeedableRng-for-Mcg128Xsl64' class='anchor'></a><a class='srclink' href='../src/rand_pcg/pcg128.rs.html#62-73' title='goto source code'>[src]</a></h3><div class='docblock'><p>We use a single 126-bit seed to initialise the state and select a stream.
Two <code>seed</code> bits (lowest order of last byte) are ignored.</p>
</div><div class='impl-items'><h4 id='associatedtype.Seed-12' class="type"><code id='Seed.t-12'>type <a href='#associatedtype.Seed' class="type">Seed</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</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.array.html">; 16]</a></code></h4><h4 id='method.from_seed-11' class="method hidden"><code id='from_seed.v-12'>fn <a href='#method.from_seed' class='fnname'>from_seed</a>(seed: &lt;<a class="struct" href="../rand_pcg/pcg128/struct.Mcg128Xsl64.html" title="struct rand_pcg::pcg128::Mcg128Xsl64">Mcg128Xsl64</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; <a class="struct" href="../rand_pcg/pcg128/struct.Mcg128Xsl64.html" title="struct rand_pcg::pcg128::Mcg128Xsl64">Mcg128Xsl64</a></code><a class='srclink' href='../src/rand_pcg/pcg128.rs.html#65-72' title='goto source code'>[src]</a></h4></div><h3 id='impl-SeedableRng-for-XorShiftRng' class='impl'><code class='in-band'>impl <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> for <a class="struct" href="../rand_xorshift/struct.XorShiftRng.html" title="struct rand_xorshift::XorShiftRng">XorShiftRng</a></code><a href='#impl-SeedableRng-for-XorShiftRng' class='anchor'></a><a class='srclink' href='../src/rand_xorshift/lib.rs.html#82-123' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Seed-13' class="type"><code id='Seed.t-13'>type <a href='#associatedtype.Seed' class="type">Seed</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</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.array.html">; 16]</a></code></h4><h4 id='method.from_seed-12' class="method hidden"><code id='from_seed.v-13'>fn <a href='#method.from_seed' class='fnname'>from_seed</a>(seed: &lt;<a class="struct" href="../rand_xorshift/struct.XorShiftRng.html" title="struct rand_xorshift::XorShiftRng">XorShiftRng</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; <a class="struct" href="../rand_xorshift/struct.XorShiftRng.html" title="struct rand_xorshift::XorShiftRng">XorShiftRng</a></code><a class='srclink' href='../src/rand_xorshift/lib.rs.html#85-102' title='goto source code'>[src]</a></h4><h4 id='method.from_rng-9' class="method hidden"><code id='from_rng.v-9'>fn <a href='#method.from_rng' class='fnname'>from_rng</a>&lt;R&gt;(rng: R) -&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="struct" href="../rand_xorshift/struct.XorShiftRng.html" title="struct rand_xorshift::XorShiftRng">XorShiftRng</a>, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&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>,&nbsp;</span></code><a class='srclink' href='../src/rand_xorshift/lib.rs.html#104-122' title='goto source code'>[src]</a></h4></div><span class='loading-content'>Loading content...</span>
<h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'><h3 id='impl-SeedableRng' class='impl'><code class='in-band'>impl SeedableRng for <a class="struct" href="../rand/rngs/struct.SmallRng.html" title="struct rand::rngs::SmallRng">SmallRng</a></code><a href='#impl-SeedableRng' class='anchor'></a><a class='srclink' href='../src/rand/rngs/small.rs.html#96-106' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Seed-14' class="type"><code id='Seed.t-14'>type <a href='#associatedtype.Seed-14' class="type">Seed</a> = &lt;<a class="type" href="../rand_pcg/pcg128/type.Pcg64Mcg.html" title="type rand_pcg::pcg128::Pcg64Mcg">Pcg64Mcg</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a></code></h4><h4 id='method.from_seed-13' class="method hidden"><code id='from_seed.v-14'>fn <a href='#method.from_seed-13' class='fnname'>from_seed</a>(seed: Self::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; Self</code><a class='srclink' href='../src/rand/rngs/small.rs.html#99-101' title='goto source code'>[src]</a></h4><h4 id='method.from_rng-10' class="method hidden"><code id='from_rng.v-10'>fn <a href='#method.from_rng-10' class='fnname'>from_rng</a>&lt;R:&nbsp;<a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a>&gt;(rng: R) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&gt;</code><a class='srclink' href='../src/rand/rngs/small.rs.html#103-105' title='goto source code'>[src]</a></h4></div><h3 id='impl-SeedableRng-1' class='impl'><code class='in-band'>impl SeedableRng for <a class="struct" href="../rand/rngs/struct.StdRng.html" title="struct rand::rngs::StdRng">StdRng</a></code><a href='#impl-SeedableRng-1' class='anchor'></a><a class='srclink' href='../src/rand/rngs/std.rs.html#55-65' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Seed-15' class="type"><code id='Seed.t-15'>type <a href='#associatedtype.Seed-15' class="type">Seed</a> = &lt;<a class="struct" href="../rand_hc/hc128/struct.Hc128Rng.html" title="struct rand_hc::hc128::Hc128Rng">Hc128Rng</a> as <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a>&gt;::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a></code></h4><h4 id='method.from_seed-14' class="method hidden"><code id='from_seed.v-15'>fn <a href='#method.from_seed-14' class='fnname'>from_seed</a>(seed: Self::<a class="type" href="../rand/trait.SeedableRng.html#associatedtype.Seed" title="type rand::SeedableRng::Seed">Seed</a>) -&gt; Self</code><a class='srclink' href='../src/rand/rngs/std.rs.html#58-60' title='goto source code'>[src]</a></h4><h4 id='method.from_rng-11' class="method hidden"><code id='from_rng.v-11'>fn <a href='#method.from_rng-11' class='fnname'>from_rng</a>&lt;R:&nbsp;<a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a>&gt;(rng: R) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="struct" href="../rand/struct.Error.html" title="struct rand::Error">Error</a>&gt;</code><a class='srclink' href='../src/rand/rngs/std.rs.html#62-64' title='goto source code'>[src]</a></h4></div></div><span class='loading-content'>Loading content...</span><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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