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<section id='main' class="content struct">
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<h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>rand</a>::<wbr><a class='struct' href=''>StdRng</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a id='src-1676' class='srclink' href='../src/rand/lib.rs.html#779-781' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct StdRng {
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// some fields omitted
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}</pre><div class='docblock'><p>The standard RNG. This is designed to be efficient on the current
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platform.</p>
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</div><h2 id='methods'>Methods</h2><h3 class='impl'><span class='in-band'><code>impl <a class='struct' href='../rand/struct.StdRng.html' title='rand::StdRng'>StdRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-1683' class='srclink' href='../src/rand/lib.rs.html#783-798' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.new' class='method'><code>fn <a href='#method.new' class='fnname'>new</a>() -> <a class='type' href='https://doc.rust-lang.org/nightly/std/io/error/type.Result.html' title='std::io::error::Result'>Result</a><<a class='struct' href='../rand/struct.StdRng.html' title='rand::StdRng'>StdRng</a>></code></h4>
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<div class='docblock'><p>Create a randomly seeded instance of <code>StdRng</code>.</p>
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<p>This is a very expensive operation as it has to read
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randomness from the operating system and use this in an
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expensive seeding operation. If one is only generating a small
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number of random numbers, or doesn't need the utmost speed for
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generating each number, <code>thread_rng</code> and/or <code>random</code> may be more
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appropriate.</p>
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<p>Reading the randomness from the OS may fail, and any error is
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propagated via the <code>io::Result</code> return value.</p>
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</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='../rand/trait.Rng.html' title='rand::Rng'>Rng</a> for <a class='struct' href='../rand/struct.StdRng.html' title='rand::StdRng'>StdRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-1687' class='srclink' href='../src/rand/lib.rs.html#800-810' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.next_u32' class='method'><code>fn <a href='../rand/trait.Rng.html#tymethod.next_u32' class='fnname'>next_u32</a>(&mut self) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u32.html'>u32</a></code></h4>
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<h4 id='method.next_u64' class='method'><code>fn <a href='../rand/trait.Rng.html#method.next_u64' class='fnname'>next_u64</a>(&mut self) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u64.html'>u64</a></code></h4>
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<h4 id='method.next_f32' class='method'><code>fn <a href='../rand/trait.Rng.html#method.next_f32' class='fnname'>next_f32</a>(&mut self) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.f32.html'>f32</a></code></h4>
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<h4 id='method.next_f64' class='method'><code>fn <a href='../rand/trait.Rng.html#method.next_f64' class='fnname'>next_f64</a>(&mut self) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.f64.html'>f64</a></code></h4>
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<h4 id='method.fill_bytes' class='method'><code>fn <a href='../rand/trait.Rng.html#method.fill_bytes' class='fnname'>fill_bytes</a>(&mut self, dest: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&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></h4>
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<h4 id='method.gen' class='method'><code>fn <a href='../rand/trait.Rng.html#method.gen' class='fnname'>gen</a><T: <a class='trait' href='../rand/trait.Rand.html' title='rand::Rand'>Rand</a>>(&mut self) -> T <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.gen_iter' class='method'><code>fn <a href='../rand/trait.Rng.html#method.gen_iter' class='fnname'>gen_iter</a><'a, T: <a class='trait' href='../rand/trait.Rand.html' title='rand::Rand'>Rand</a>>(&'a mut self) -> <a class='struct' href='../rand/struct.Generator.html' title='rand::Generator'>Generator</a><'a, T, Self> <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.gen_range' class='method'><code>fn <a href='../rand/trait.Rng.html#method.gen_range' class='fnname'>gen_range</a><T: <a class='trait' href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html' title='core::cmp::PartialOrd'>PartialOrd</a> + <a class='trait' href='../rand/distributions/range/trait.SampleRange.html' title='rand::distributions::range::SampleRange'>SampleRange</a>>(&mut self, low: T, high: T) -> T <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.gen_weighted_bool' class='method'><code>fn <a href='../rand/trait.Rng.html#method.gen_weighted_bool' class='fnname'>gen_weighted_bool</a>(&mut self, n: <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.bool.html'>bool</a> <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.gen_ascii_chars' class='method'><code>fn <a href='../rand/trait.Rng.html#method.gen_ascii_chars' class='fnname'>gen_ascii_chars</a><'a>(&'a mut self) -> <a class='struct' href='../rand/struct.AsciiGenerator.html' title='rand::AsciiGenerator'>AsciiGenerator</a><'a, Self> <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.choose' class='method'><code>fn <a href='../rand/trait.Rng.html#method.choose' class='fnname'>choose</a><'a, T>(&mut self, values: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&'a [</a>T<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>) -> <a class='enum' href='https://doc.rust-lang.org/nightly/core/option/enum.Option.html' title='core::option::Option'>Option</a><&'a T> <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.shuffle' class='method'><code>fn <a href='../rand/trait.Rng.html#method.shuffle' class='fnname'>shuffle</a><T>(&mut self, values: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&mut [</a>T<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>) <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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</div><h3 class='impl'><span class='in-band'><code>impl<'a> <a class='trait' href='../rand/trait.SeedableRng.html' title='rand::SeedableRng'>SeedableRng</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&'a [</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>> for <a class='struct' href='../rand/struct.StdRng.html' title='rand::StdRng'>StdRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-1692' class='srclink' href='../src/rand/lib.rs.html#812-822' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.reseed' class='method'><code>fn <a href='../rand/trait.SeedableRng.html#tymethod.reseed' class='fnname'>reseed</a>(&mut self, seed: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&'a [</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>)</code></h4>
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<h4 id='method.from_seed' class='method'><code>fn <a href='../rand/trait.SeedableRng.html#tymethod.from_seed' class='fnname'>from_seed</a>(seed: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&'a [</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>) -> <a class='struct' href='../rand/struct.StdRng.html' title='rand::StdRng'>StdRng</a></code></h4>
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</div><h3 id='derived_implementations'>Derived Implementations </h3><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html' title='core::clone::Clone'>Clone</a> for <a class='struct' href='../rand/struct.StdRng.html' title='rand::StdRng'>StdRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-1678' class='srclink' href='../src/rand/lib.rs.html#778' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.clone' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class='struct' href='../rand/struct.StdRng.html' title='rand::StdRng'>StdRng</a></code></h4>
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<h4 id='method.clone_from' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: &Self)</code><div class="since">1.0.0</div></h4>
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</div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html' title='core::marker::Copy'>Copy</a> for <a class='struct' href='../rand/struct.StdRng.html' title='rand::StdRng'>StdRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-1682' class='srclink' href='../src/rand/lib.rs.html#778' title='goto source code'>[src]</a></span></h3>
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