149 lines
8.7 KiB
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149 lines
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<title>num_traits::identities::Zero - Rust</title>
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<p class='location'>Trait Zero</p><div class="block items"><ul><li><a href="#required-methods">Required Methods</a></li><li><a href="#implementors">Implementors</a></li></ul></div><p class='location'><a href='../index.html'>num_traits</a>::<wbr><a href='index.html'>identities</a></p><script>window.sidebarCurrent = {name: 'Zero', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>num_traits</a>::<wbr><a href='index.html'>identities</a>::<wbr><a class="trait" href=''>Zero</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/num_traits/identities.rs.html#5-26' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait Zero: <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/ops/arith/trait.Add.html" title="trait core::ops::arith::Add">Add</a><Self, Output = Self> {
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fn <a href='#tymethod.zero' class='fnname'>zero</a>() -> Self;
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fn <a href='#tymethod.is_zero' class='fnname'>is_zero</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>;
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}</pre><div class='docblock'><p>Defines an additive identity element for <code>Self</code>.</p>
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</div>
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<h2 id='required-methods'>Required Methods</h2>
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<div class='methods'>
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<h3 id='tymethod.zero' class='method'><span id='zero.v' class='invisible'><code>fn <a href='#tymethod.zero' class='fnname'>zero</a>() -> Self</code></span></h3><div class='docblock'><p>Returns the additive identity element of <code>Self</code>, <code>0</code>.</p>
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<h1 id='laws' class='section-header'><a href='#laws'>Laws</a></h1>
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<pre><code class="language-{.text}">a + 0 = a ∀ a ∈ Self
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0 + a = a ∀ a ∈ Self
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</code></pre>
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<h1 id='purity' class='section-header'><a href='#purity'>Purity</a></h1>
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<p>This function should return the same result at all times regardless of
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external mutable state, for example values stored in TLS or in
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<code>static mut</code>s.</p>
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</div><h3 id='tymethod.is_zero' class='method'><span id='is_zero.v' class='invisible'><code>fn <a href='#tymethod.is_zero' class='fnname'>is_zero</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h3><div class='docblock'><p>Returns <code>true</code> if <code>self</code> is equal to the additive identity.</p>
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</div></div>
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<h2 id='implementors'>Implementors</h2>
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<ul class='item-list' id='implementors-list'>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a></code></li>
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<li><code>impl Zero for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a></code></li>
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<li><code>impl<T: <a class="trait" href="../../num_traits/identities/trait.Zero.html" title="trait num_traits::identities::Zero">Zero</a>> Zero for <a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.Wrapping.html" title="struct core::num::Wrapping">Wrapping</a><T> <span class="where fmt-newline">where<br> <a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.Wrapping.html" title="struct core::num::Wrapping">Wrapping</a><T>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.Add.html" title="trait core::ops::arith::Add">Add</a><Output = <a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.Wrapping.html" title="struct core::num::Wrapping">Wrapping</a><T>>, </span></code></li>
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