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        <p class='location'>Trait CheckedSub</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_sub">checked_sub</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-CheckedSub">isize</a><a href="#impl-CheckedSub">i32</a><a href="#impl-CheckedSub">u32</a><a href="#impl-CheckedSub">i8</a><a href="#impl-CheckedSub">i64</a><a href="#impl-CheckedSub">u16</a><a href="#impl-CheckedSub">usize</a><a href="#impl-CheckedSub">u8</a><a href="#impl-CheckedSub">i16</a><a href="#impl-CheckedSub">u64</a><a href="#impl-CheckedSub">Ratio&lt;T&gt;</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>num</a></p><script>window.sidebarCurrent = {name: 'CheckedSub', 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</a>::<wbr><a class="trait" href=''>CheckedSub</a></span><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>]
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               </span><a class='srclink' href='../src/num_traits/ops/checked.rs.html#35-39' title='goto source code'>[src]</a></span></h1>
<pre class='rust trait'>pub trait CheckedSub: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.Sub.html" title="trait core::ops::arith::Sub">Sub</a>&lt;Self, Output = Self&gt; {
    fn <a href='#tymethod.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>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 subtraction that returns <code>None</code> instead of wrapping around on underflow.</p>
</div>
            <h2 id='required-methods' class='small-section-header'>
              Required Methods<a href='#required-methods' class='anchor'></a>
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            <div class='methods'>
        <h3 id='tymethod.checked_sub' class='method'><span id='checked_sub.v' class='invisible'><code>fn <a href='#tymethod.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>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>Subtracts two numbers, checking for underflow. If underflow happens,
<code>None</code> is returned.</p>
</div></div>
                <h2 id='foreign-impls' class='small-section-header'>
                  Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
                </h2>
            <h3 id='impl-CheckedSub' class='impl'><span class='in-band'><code>impl <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a></code><a href='#impl-CheckedSub' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/num_traits/ops/checked.rs.html#13-18' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub' class="method"><span id='checked_sub.v-1' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>) -&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#15-17' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedSub-1' class='impl'><span class='in-band'><code>impl <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a></code><a href='#impl-CheckedSub-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#13-18' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub-1' class="method"><span id='checked_sub.v-2' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>) -&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#15-17' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedSub-2' class='impl'><span class='in-band'><code>impl <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code><a href='#impl-CheckedSub-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#13-18' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub-2' class="method"><span id='checked_sub.v-3' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&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#15-17' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedSub-3' class='impl'><span class='in-band'><code>impl <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a></code><a href='#impl-CheckedSub-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#13-18' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub-3' class="method"><span id='checked_sub.v-4' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a>) -&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#15-17' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedSub-4' class='impl'><span class='in-band'><code>impl <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a></code><a href='#impl-CheckedSub-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#13-18' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub-4' class="method"><span id='checked_sub.v-5' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>) -&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#15-17' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedSub-5' class='impl'><span class='in-band'><code>impl <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a></code><a href='#impl-CheckedSub-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#13-18' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub-5' class="method"><span id='checked_sub.v-6' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a>) -&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#15-17' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedSub-6' class='impl'><span class='in-band'><code>impl <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code><a href='#impl-CheckedSub-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#13-18' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub-6' class="method"><span id='checked_sub.v-7' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&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#15-17' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedSub-7' class='impl'><span class='in-band'><code>impl <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a></code><a href='#impl-CheckedSub-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#13-18' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub-7' class="method"><span id='checked_sub.v-8' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>) -&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#15-17' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedSub-8' class='impl'><span class='in-band'><code>impl <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a></code><a href='#impl-CheckedSub-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#13-18' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub-8' class="method"><span id='checked_sub.v-9' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a>) -&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#15-17' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedSub-9' class='impl'><span class='in-band'><code>impl <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a></code><a href='#impl-CheckedSub-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#13-18' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub-9' class="method"><span id='checked_sub.v-10' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&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#15-17' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-CheckedSub-10' class='impl'><span class='in-band'><code>impl&lt;T&gt; <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> for <a class="struct" href="../num_rational/struct.Ratio.html" title="struct num_rational::Ratio">Ratio</a>&lt;T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> + <a class="trait" href="../num/trait.Integer.html" title="trait num::Integer">Integer</a> + <a class="trait" href="../num/trait.CheckedSub.html" title="trait num::CheckedSub">CheckedSub</a> + <a class="trait" href="../num/trait.CheckedMul.html" title="trait num::CheckedMul">CheckedMul</a>,&nbsp;</span></code><a href='#impl-CheckedSub-10' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/num_rational/lib.rs.html#678-686' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.checked_sub-10' class="method"><span id='checked_sub.v-11' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(&amp;self, rhs: &amp;<a class="struct" href="../num_rational/struct.Ratio.html" title="struct num_rational::Ratio">Ratio</a>&lt;T&gt;) -&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="struct" href="../num_rational/struct.Ratio.html" title="struct num_rational::Ratio">Ratio</a>&lt;T&gt;&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/num_rational/lib.rs.html#680-685' title='goto source code'>[src]</a></span></h4>
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          Implementors<a href='#implementors' class='anchor'></a>
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    <li><div class='out-of-band'><a class='srclink' href='../src/num_bigint/biguint.rs.html#891-900' title='goto source code'>[src]</a></div><code>impl CheckedSub for <a class="struct" href="../num/struct.BigUint.html" title="struct num::BigUint">BigUint</a></code></li>
<li><div class='out-of-band'><a class='srclink' href='../src/num_bigint/bigint.rs.html#936-941' title='goto source code'>[src]</a></div><code>impl CheckedSub for <a class="struct" href="../num/struct.BigInt.html" title="struct num::BigInt">BigInt</a></code></li>
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