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<p class='location'>Trait FromPrimitive</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.from_i64">from_i64</a><a href="#tymethod.from_u64">from_u64</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.from_isize">from_isize</a><a href="#method.from_i8">from_i8</a><a href="#method.from_i16">from_i16</a><a href="#method.from_i32">from_i32</a><a href="#method.from_i128">from_i128</a><a href="#method.from_usize">from_usize</a><a href="#method.from_u8">from_u8</a><a href="#method.from_u16">from_u16</a><a href="#method.from_u32">from_u32</a><a href="#method.from_u128">from_u128</a><a href="#method.from_f32">from_f32</a><a href="#method.from_f64">from_f64</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-FromPrimitive">Wrapping<T></a><a href="#impl-FromPrimitive">f64</a><a href="#impl-FromPrimitive">i128</a><a href="#impl-FromPrimitive">u128</a><a href="#impl-FromPrimitive">u16</a><a href="#impl-FromPrimitive">i32</a><a href="#impl-FromPrimitive">isize</a><a href="#impl-FromPrimitive">i16</a><a href="#impl-FromPrimitive">i64</a><a href="#impl-FromPrimitive">f32</a><a href="#impl-FromPrimitive">i8</a><a href="#impl-FromPrimitive">u64</a><a href="#impl-FromPrimitive">u32</a><a href="#impl-FromPrimitive">usize</a><a href="#impl-FromPrimitive">u8</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>num_traits</a></p><script>window.sidebarCurrent = {name: 'FromPrimitive', 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'>num_traits</a>::<wbr><a class="trait" href=''>FromPrimitive</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/num_traits/cast.rs.html#353-457' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust trait'>pub trait FromPrimitive {
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fn <a href='#tymethod.from_i64' class='fnname'>from_i64</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self>;
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<div class='item-spacer'></div> fn <a href='#tymethod.from_u64' class='fnname'>from_u64</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self>;
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fn <a href='#method.from_isize' class='fnname'>from_isize</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_i8' class='fnname'>from_i8</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_i16' class='fnname'>from_i16</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_i32' class='fnname'>from_i32</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_i128' class='fnname'>from_i128</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i128.html">i128</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_usize' class='fnname'>from_usize</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_u8' class='fnname'>from_u8</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_u16' class='fnname'>from_u16</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_u32' class='fnname'>from_u32</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_u128' class='fnname'>from_u128</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u128.html">u128</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_f32' class='fnname'>from_f32</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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<div class='item-spacer'></div> fn <a href='#method.from_f64' class='fnname'>from_f64</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> { ... }
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}</pre></div><div class='docblock'><p>A generic trait for converting a number to a value.</p>
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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.from_i64' class='method'><span id='from_i64.v' class='invisible'><code>fn <a href='#tymethod.from_i64' class='fnname'>from_i64</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>i64</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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</div><h3 id='tymethod.from_u64' class='method'><span id='from_u64.v' class='invisible'><code>fn <a href='#tymethod.from_u64' class='fnname'>from_u64</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>u64</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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</div></div>
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<h2 id='provided-methods' class='small-section-header'>
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Provided Methods<a href='#provided-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='method.from_isize' class='method'><span id='from_isize.v' class='invisible'><code>fn <a href='#method.from_isize' class='fnname'>from_isize</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>isize</code> to return an optional value of this type. If the
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value cannot be represented by this value, the <code>None</code> is returned.</p>
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</div><h3 id='method.from_i8' class='method'><span id='from_i8.v' class='invisible'><code>fn <a href='#method.from_i8' class='fnname'>from_i8</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>i8</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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</div><h3 id='method.from_i16' class='method'><span id='from_i16.v' class='invisible'><code>fn <a href='#method.from_i16' class='fnname'>from_i16</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>i16</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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</div><h3 id='method.from_i32' class='method'><span id='from_i32.v' class='invisible'><code>fn <a href='#method.from_i32' class='fnname'>from_i32</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>i32</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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</div><h3 id='method.from_i128' class='method'><span id='from_i128.v' class='invisible'><code>fn <a href='#method.from_i128' class='fnname'>from_i128</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i128.html">i128</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>i128</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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<p>This method is only available with feature <code>i128</code> enabled on Rust >= 1.26.</p>
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<p>The default implementation converts through <code>from_i64()</code>. Types implementing
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this trait should override this method if they can represent a greater range.</p>
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</div><h3 id='method.from_usize' class='method'><span id='from_usize.v' class='invisible'><code>fn <a href='#method.from_usize' class='fnname'>from_usize</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert a <code>usize</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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</div><h3 id='method.from_u8' class='method'><span id='from_u8.v' class='invisible'><code>fn <a href='#method.from_u8' class='fnname'>from_u8</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>u8</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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</div><h3 id='method.from_u16' class='method'><span id='from_u16.v' class='invisible'><code>fn <a href='#method.from_u16' class='fnname'>from_u16</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>u16</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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</div><h3 id='method.from_u32' class='method'><span id='from_u32.v' class='invisible'><code>fn <a href='#method.from_u32' class='fnname'>from_u32</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>u32</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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</div><h3 id='method.from_u128' class='method'><span id='from_u128.v' class='invisible'><code>fn <a href='#method.from_u128' class='fnname'>from_u128</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u128.html">u128</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert an <code>u128</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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<p>This method is only available with feature <code>i128</code> enabled on Rust >= 1.26.</p>
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<p>The default implementation converts through <code>from_u64()</code>. Types implementing
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this trait should override this method if they can represent a greater range.</p>
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</div><h3 id='method.from_f32' class='method'><span id='from_f32.v' class='invisible'><code>fn <a href='#method.from_f32' class='fnname'>from_f32</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert a <code>f32</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</p>
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</div><h3 id='method.from_f64' class='method'><span id='from_f64.v' class='invisible'><code>fn <a href='#method.from_f64' class='fnname'>from_f64</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='docblock'><p>Convert a <code>f64</code> to return an optional value of this type. If the
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type cannot be represented by this value, the <code>None</code> is returned.</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-FromPrimitive' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="../num_traits/cast/trait.FromPrimitive.html" title="trait num_traits::cast::FromPrimitive">FromPrimitive</a> 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> T: <a class="trait" href="../num_traits/cast/trait.FromPrimitive.html" title="trait num_traits::cast::FromPrimitive">FromPrimitive</a>, </span></code><a href='#impl-FromPrimitive' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/num_traits/cast.rs.html#544-565' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'><h4 id='method.from_isize-1' class="method"><span id='from_isize.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.from_isize' class='fnname'>from_isize</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.Wrapping.html" title="struct core::num::Wrapping">Wrapping</a><T>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/num_traits/cast.rs.html#538-540' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.from_i8-1' class="method"><span id='from_i8.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.from_i8' class='fnname'>from_i8</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.Wrapping.html" title="struct core::num::Wrapping">Wrapping</a><T>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/num_traits/cast.rs.html#538-540' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.from_i16-1' class="method"><span id='from_i16.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.from_i16' class='fnname'>from_i16</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.Wrapping.html" title="struct core::num::Wrapping">Wrapping</a><T>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/num_traits/cast.rs.html#538-540' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.from_i32-1' class="method"><span id='from_i32.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.from_i32' class='fnname'>from_i32</a>(n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.Wrapping.html" title="struct core::num::Wrapping">Wrapping</a><T>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/num_traits/cast.rs.html#538-540' title='goto source code'>[src]</a></td></tr></tbody></t
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