mentat/num_traits/ops/checked/trait.CheckedNeg.html

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<p class='location'>Trait CheckedNeg</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.checked_neg">checked_neg</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-CheckedNeg">u8</a><a href="#impl-CheckedNeg">u16</a><a href="#impl-CheckedNeg">u32</a><a href="#impl-CheckedNeg">u64</a><a href="#impl-CheckedNeg">usize</a><a href="#impl-CheckedNeg">i8</a><a href="#impl-CheckedNeg">i16</a><a href="#impl-CheckedNeg">i32</a><a href="#impl-CheckedNeg">i64</a><a href="#impl-CheckedNeg">isize</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../../index.html'>num_traits</a>::<wbr><a href='../index.html'>ops</a>::<wbr><a href='index.html'>checked</a></p><script>window.sidebarCurrent = {name: 'CheckedNeg', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Trait <a href='../../index.html'>num_traits</a>::<wbr><a href='../index.html'>ops</a>::<wbr><a href='index.html'>checked</a>::<wbr><a class="trait" href=''>CheckedNeg</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust trait'>pub trait CheckedNeg: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> {
fn <a href='#tymethod.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;Self&gt;;
}</pre><div class='docblock'><p>Performs negation that returns <code>None</code> if the result can't be represented.</p>
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<h2 id='required-methods' class='small-section-header'>
Required Methods<a href='#required-methods' class='anchor'></a>
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<h3 id='tymethod.checked_neg' class='method'><span id='checked_neg.v' class='invisible'><code>fn <a href='#tymethod.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;Self&gt;</code></span></h3><div class='docblock'><p>Negates a number, returning <code>None</code> for results that can't be represented, like signed <code>MIN</code>
values that can't be positive, or non-zero unsigned values that can't be negative.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">num_traits</span>::<span class="ident">CheckedNeg</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">i32</span>::<span class="ident">MIN</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">CheckedNeg</span>::<span class="ident">checked_neg</span>(<span class="kw-2">&amp;</span><span class="number">1_i32</span>), <span class="prelude-val">Some</span>(<span class="op">-</span><span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">CheckedNeg</span>::<span class="ident">checked_neg</span>(<span class="kw-2">&amp;</span><span class="op">-</span><span class="number">1_i32</span>), <span class="prelude-val">Some</span>(<span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">CheckedNeg</span>::<span class="ident">checked_neg</span>(<span class="kw-2">&amp;</span><span class="ident">MIN</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">CheckedNeg</span>::<span class="ident">checked_neg</span>(<span class="kw-2">&amp;</span><span class="number">0_u32</span>), <span class="prelude-val">Some</span>(<span class="number">0</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">CheckedNeg</span>::<span class="ident">checked_neg</span>(<span class="kw-2">&amp;</span><span class="number">1_u32</span>), <span class="prelude-val">None</span>);</pre>
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<h2 id='foreign-impls' class='small-section-header'>
Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
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<h3 id='impl-CheckedNeg' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../num_traits/ops/checked/trait.CheckedNeg.html" title="trait num_traits::ops::checked::CheckedNeg">CheckedNeg</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a></code><a href='#impl-CheckedNeg' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#152-157' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_neg' class="method"><span id='checked_neg.v-1' class='invisible'><code>fn <a href='#method.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#154-156' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedNeg-1' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../num_traits/ops/checked/trait.CheckedNeg.html" title="trait num_traits::ops::checked::CheckedNeg">CheckedNeg</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a></code><a href='#impl-CheckedNeg-1' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#152-157' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_neg-1' class="method"><span id='checked_neg.v-2' class='invisible'><code>fn <a href='#method.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#154-156' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedNeg-2' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../num_traits/ops/checked/trait.CheckedNeg.html" title="trait num_traits::ops::checked::CheckedNeg">CheckedNeg</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code><a href='#impl-CheckedNeg-2' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#152-157' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_neg-2' class="method"><span id='checked_neg.v-3' class='invisible'><code>fn <a href='#method.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#154-156' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedNeg-3' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../num_traits/ops/checked/trait.CheckedNeg.html" title="trait num_traits::ops::checked::CheckedNeg">CheckedNeg</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a></code><a href='#impl-CheckedNeg-3' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#152-157' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_neg-3' class="method"><span id='checked_neg.v-4' class='invisible'><code>fn <a href='#method.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#154-156' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedNeg-4' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../num_traits/ops/checked/trait.CheckedNeg.html" title="trait num_traits::ops::checked::CheckedNeg">CheckedNeg</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code><a href='#impl-CheckedNeg-4' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#152-157' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_neg-4' class="method"><span id='checked_neg.v-5' class='invisible'><code>fn <a href='#method.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#154-156' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedNeg-5' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../num_traits/ops/checked/trait.CheckedNeg.html" title="trait num_traits::ops::checked::CheckedNeg">CheckedNeg</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a></code><a href='#impl-CheckedNeg-5' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#152-157' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_neg-5' class="method"><span id='checked_neg.v-6' class='invisible'><code>fn <a href='#method.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#154-156' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedNeg-6' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../num_traits/ops/checked/trait.CheckedNeg.html" title="trait num_traits::ops::checked::CheckedNeg">CheckedNeg</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a></code><a href='#impl-CheckedNeg-6' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#152-157' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_neg-6' class="method"><span id='checked_neg.v-7' class='invisible'><code>fn <a href='#method.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#154-156' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedNeg-7' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../num_traits/ops/checked/trait.CheckedNeg.html" title="trait num_traits::ops::checked::CheckedNeg">CheckedNeg</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a></code><a href='#impl-CheckedNeg-7' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#152-157' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_neg-7' class="method"><span id='checked_neg.v-8' class='invisible'><code>fn <a href='#method.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#154-156' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedNeg-8' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../num_traits/ops/checked/trait.CheckedNeg.html" title="trait num_traits::ops::checked::CheckedNeg">CheckedNeg</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a></code><a href='#impl-CheckedNeg-8' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#152-157' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_neg-8' class="method"><span id='checked_neg.v-9' class='invisible'><code>fn <a href='#method.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#154-156' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedNeg-9' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../num_traits/ops/checked/trait.CheckedNeg.html" title="trait num_traits::ops::checked::CheckedNeg">CheckedNeg</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a></code><a href='#impl-CheckedNeg-9' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#152-157' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_neg-9' class="method"><span id='checked_neg.v-10' class='invisible'><code>fn <a href='#method.checked_neg' class='fnname'>checked_neg</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/num_traits/ops/checked.rs.html#154-156' title='goto source code'>[src]</a></span></h4>
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