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<p class='location'>Trait Rand</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.rand">rand</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-Rand">[T; 13]</a><a href="#impl-Rand">[T; 6]</a><a href="#impl-Rand">[T; 18]</a><a href="#impl-Rand">(A,)</a><a href="#impl-Rand">u8</a><a href="#impl-Rand">[T; 7]</a><a href="#impl-Rand">(A, B, C, D, E, F, G)</a><a href="#impl-Rand">[T; 5]</a><a href="#impl-Rand">(A, B, C)</a><a href="#impl-Rand">char</a><a href="#impl-Rand">[T; 31]</a><a href="#impl-Rand">[T; 17]</a><a href="#impl-Rand">u32</a><a href="#impl-Rand">(A, B, C, D, E)</a><a href="#impl-Rand">Option<T></a><a href="#impl-Rand">[T; 25]</a><a href="#impl-Rand">[T; 24]</a><a href="#impl-Rand">f64</a><a href="#impl-Rand">[T; 26]</a><a href="#impl-Rand">i16</a><a href="#impl-Rand">(A, B, C, D, E, F, G, H, I, J, K)</a><a href="#impl-Rand">isize</a><a href="#impl-Rand">i8</a><a href="#impl-Rand">(A, B, C, D, E, F, G, H)</a><a href="#impl-Rand">[T; 9]</a><a href="#impl-Rand">(A, B, C, D, E, F, G, H, I, J)</a><a href="#impl-Rand">[T; 12]</a><a href="#impl-Rand">[T; 20]</a><a href="#impl-Rand">(A, B)</a><a href="#impl-Rand">u16</a><a href="#impl-Rand">(A, B, C, D)</a><a href="#impl-Rand">[T; 1]</a><a href="#impl-Rand">[T; 0]</a><a href="#impl-Rand">f32</a><a href="#impl-Rand">[T; 19]</a><a href="#impl-Rand">(A, B, C, D, E, F)</a><a href="#impl-Rand">[T; 21]</a><a href="#impl-Rand">[T; 29]</a><a href="#impl-Rand">[T; 30]</a><a href="#impl-Rand">usize</a><a href="#impl-Rand">[T; 4]</a><a href="#impl-Rand">i32</a><a href="#impl-Rand">[T; 23]</a><a href="#impl-Rand">()</a><a href="#impl-Rand">[T; 2]</a><a href="#impl-Rand">[T; 14]</a><a href="#impl-Rand">[T; 15]</a><a href="#impl-Rand">[T; 8]</a><a href="#impl-Rand">[T; 22]</a><a href="#impl-Rand">[T; 3]</a><a href="#impl-Rand">[T; 28]</a><a href="#impl-Rand">(A, B, C, D, E, F, G, H, I, J, K, L)</a><a href="#impl-Rand">bool</a><a href="#impl-Rand">[T; 11]</a><a href="#impl-Rand">[T; 27]</a><a href="#impl-Rand">(A, B, C, D, E, F, G, H, I)</a><a href="#impl-Rand">[T; 16]</a><a href="#impl-Rand">[T; 32]</a><a href="#impl-Rand">u64</a><a href="#impl-Rand">i64</a><a href="#impl-Rand">[T; 10]</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: 'Rand', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Trait <a href='index.html'>rand</a>::<wbr><a class="trait" href=''>Rand</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/rand/lib.rs.html#332-336' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust trait'>pub trait Rand {
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fn <a href='#tymethod.rand' class='fnname'>rand</a><R>(rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R) -> Self<br> <span class="where">where<br> R: <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a></span>;
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}</pre></div><div class='docblock'><p>A type that can be randomly generated using an <code>Rng</code>.</p>
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<h2 id="built-in-implementations" class="section-header"><a href="#built-in-implementations">Built-in Implementations</a></h2>
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<p>This crate implements <code>Rand</code> for various primitive types. Assuming the
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provided <code>Rng</code> is well-behaved, these implementations generate values with
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the following ranges and distributions:</p>
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<ul>
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<li>Integers (<code>i32</code>, <code>u32</code>, <code>isize</code>, <code>usize</code>, etc.): Uniformly distributed
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over all values of the type.</li>
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<li><code>char</code>: Uniformly distributed over all Unicode scalar values, i.e. all
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code points in the range <code>0...0x10_FFFF</code>, except for the range
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<code>0xD800...0xDFFF</code> (the surrogate code points). This includes
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unassigned/reserved code points.</li>
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<li><code>bool</code>: Generates <code>false</code> or <code>true</code>, each with probability 0.5.</li>
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<li>Floating point types (<code>f32</code> and <code>f64</code>): Uniformly distributed in the
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half-open range <code>[0, 1)</code>. (The <a href="struct.Open01.html"><code>Open01</code></a>, <a href="struct.Closed01.html"><code>Closed01</code></a>, <a href="distributions/exponential/struct.Exp1.html"><code>Exp1</code></a>, and
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<a href="distributions/normal/struct.StandardNormal.html"><code>StandardNormal</code></a> wrapper types produce floating point numbers with
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alternative ranges or distributions.)</li>
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</ul>
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<p>The following aggregate types also implement <code>Rand</code> as long as their
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component types implement it:</p>
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<ul>
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<li>Tuples and arrays: Each element of the tuple or array is generated
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independently, using its own <code>Rand</code> implementation.</li>
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<li><code>Option<T></code>: Returns <code>None</code> with probability 0.5; otherwise generates a
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random <code>T</code> and returns <code>Some(T)</code>.</li>
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</ul>
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</div>
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<h2 id='required-methods' class='small-section-header'>
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Required Methods<a href='#required-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='tymethod.rand' class='method'><span id='rand.v' class='invisible'><code>fn <a href='#tymethod.rand' class='fnname'>rand</a><R>(rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R) -> Self <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>, </span></code></span></h3><div class='docblock'><p>Generates a random instance of this type using the specified source of
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randomness.</p>
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</div></div>
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<h2 id='foreign-impls' class='small-section-header'>
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Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
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</h2>
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<h3 id='impl-Rand' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</a>T<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 13]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>, </span></code><a href='#impl-Rand' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#222-227' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'><h4 id='method.rand' class="method"><span id='rand.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.rand' class='fnname'>rand</a><R>(_rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</a>T<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 13]</a> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#224-226' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4></div></span><h3 id='impl-Rand-1' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</a>T<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 6]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>, </span></code><a href='#impl-Rand-1' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#222-227' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'><h4 id='method.rand-1' class="method"><span id='rand.v-2' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.rand' class='fnname'>rand</a><R>(_rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</a>T<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 6]</a> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#224-226' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4></div></span><h3 id='impl-Rand-2' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</a>T<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 18]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>, </span></code><a href='#impl-Rand-2' class='anc
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interval <code>[0,1)</code>.</p>
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<p>See <code>Closed01</code> for the closed interval <code>[0,1]</code>,
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and <code>Open01</code> for the open interval <code>(0,1)</code>.</p>
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</div></div></span><h3 id='impl-Rand-18' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</a>T<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 26]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>, </span></code><a href='#impl-Rand-18' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#222-227' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'><h4 id='method.rand-18' class="method"><span id='rand.v-19' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.rand' class='fnname'>rand</a><R>(_rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</a>T<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 26]</a> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#224-226' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4></div></span><h3 id='impl-Rand-19' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a></code><a href='#impl-Rand-19' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#35-40' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'><h4 id='method.rand-19' class="method"><span id='rand.v-20' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.rand' class='fnname'>rand</a><R>(rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#37-39' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4></div></span><h3 id='impl-Rand-20' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<A, B, C, D, E, F, G, H, I, J, K> <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>A, B, C, D, E, F, G, H, I, J, K<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>,<br> B: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>,<br> C: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>,<br> D: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>,<br>&n
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interval <code>[0,1)</code>.</p>
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<p>See <code>Closed01</code> for the closed interval <code>[0,1]</code>,
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and <code>Open01</code> for the open interval <code>(0,1)</code>.</p>
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</div></div></span><h3 id='impl-Rand-34' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</a>T<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 19]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>, </span></code><a href='#impl-Rand-34' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#222-227' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'><h4 id='method.rand-34' class="method"><span id='rand.v-35' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.rand' class='fnname'>rand</a><R>(_rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</a>T<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 19]</a> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#224-226' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4></div></span><h3 id='impl-Rand-35' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<A, B, C, D, E, F> <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>A, B, C, D, E, F<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>,<br> B: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>,<br> C: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>,<br> D: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>,<br> E: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>,<br> F: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>, </span></code><a href='#impl-Rand-35' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#182-197' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'><h4 id='method.rand-35' class="method"><span id='rand.v-36' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.rand' class='fnname'>rand</a><R>(_rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>A, B, C, D, E, F<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/rand_impls.rs.html#187-196' title='goto source code'>[src]</a></td></tr></tbody></table
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<h2 id='implementors' class='small-section-header'>
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Implementors<a href='#implementors' class='anchor'></a>
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</h2>
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<ul class='item-list' id='implementors-list'>
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<li><table class='table-display'><tbody><tr><td><code>impl Rand for <a class="struct" href="../rand/struct.Closed01.html" title="struct rand::Closed01">Closed01</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rand_impls.rs.html#140-147' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
|
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<li><table class='table-display'><tbody><tr><td><code>impl Rand for <a class="struct" href="../rand/isaac/struct.IsaacRng.html" title="struct rand::isaac::IsaacRng">IsaacRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/isaac.rs.html#248-265' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl Rand for <a class="struct" href="../rand/struct.XorShiftRng.html" title="struct rand::XorShiftRng">XorShiftRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/xorshift.rs.html#92-101' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl Rand for <a class="struct" href="../rand/struct.Open01.html" title="struct rand::Open01">Open01</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rand_impls.rs.html#130-139' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
|
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<li><table class='table-display'><tbody><tr><td><code>impl Rand for <a class="struct" href="../rand/chacha/struct.ChaChaRng.html" title="struct rand::chacha::ChaChaRng">ChaChaRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/chacha.rs.html#224-232' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl Rand for <a class="struct" href="../rand/struct.Closed01.html" title="struct rand::Closed01">Closed01</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a>></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rand_impls.rs.html#140-147' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
|
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<li><table class='table-display'><tbody><tr><td><code>impl Rand for <a class="struct" href="../rand/isaac/struct.Isaac64Rng.html" title="struct rand::isaac::Isaac64Rng">Isaac64Rng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/isaac64.rs.html#246-263' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
|
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|
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<li><table class='table-display'><tbody><tr><td><code>impl Rand for <a class="struct" href="../rand/distributions/exponential/struct.Exp1.html" title="struct rand::distributions::exponential::Exp1">Exp1</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/distributions/exponential.rs.html#41-58' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
|
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<li><table class='table-display'><tbody><tr><td><code>impl Rand for <a class="struct" href="../rand/distributions/normal/struct.StandardNormal.html" title="struct rand::distributions::normal::StandardNormal">StandardNormal</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/distributions/normal.rs.html#39-74' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
|
|||
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<li><table class='table-display'><tbody><tr><td><code>impl Rand for <a class="struct" href="../rand/struct.Open01.html" title="struct rand::Open01">Open01</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a>></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rand_impls.rs.html#130-139' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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