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</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>::<span class="ident">Mul</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">num</span>::<span class="ident">Wrapping</span>;
<span class="kw">use</span> {<span class="ident">One</span>, <span class="ident">CheckedMul</span>};
<span class="doccomment">/// Binary operator for raising a value to a power.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Pow</span><span class="op"><</span><span class="ident">RHS</span><span class="op">></span> {
<span class="doccomment">/// The result after applying the operator.</span>
<span class="kw">type</span> <span class="ident">Output</span>;
<span class="doccomment">/// Returns `self` to the power `rhs`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use num_traits::Pow;</span>
<span class="doccomment">/// assert_eq!(Pow::pow(10u32, 2u32), 100);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">pow</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">RHS</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">Output</span>;
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">pow_impl</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span>) <span class="op">=></span> {
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>, <span class="ident">u8</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>, <span class="ident">usize</span>);
<span class="comment">// FIXME: these should be possible</span>
<span class="comment">// pow_impl!($t, u16);</span>
<span class="comment">// pow_impl!($t, u32);</span>
<span class="comment">// pow_impl!($t, u64);</span>
};
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span>:<span class="ident">ty</span>) <span class="op">=></span> {
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span>, <span class="ident">usize</span>, <span class="ident">pow</span>);
};
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span>:<span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">desired_rhs</span>:<span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>:<span class="ident">expr</span>) <span class="op">=></span> {
<span class="kw">impl</span> <span class="ident">Pow</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">pow</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>)(<span class="self">self</span>, <span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">desired_rhs</span><span class="op">></span>::<span class="ident">from</span>(<span class="ident">rhs</span>))
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Pow</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">pow</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>)(<span class="self">self</span>, <span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">desired_rhs</span><span class="op">></span>::<span class="ident">from</span>(<span class="kw-2">*</span><span class="ident">rhs</span>))
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Pow</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span><span class="op">></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">pow</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>)(<span class="kw-2">*</span><span class="self">self</span>, <span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">desired_rhs</span><span class="op">></span>::<span class="ident">from</span>(<span class="ident">rhs</span>))
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span><span class="op">></span> <span class="ident">Pow</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span><span class="op">></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">pow</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rhs</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>)(<span class="kw-2">*</span><span class="self">self</span>, <span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">desired_rhs</span><span class="op">></span>::<span class="ident">from</span>(<span class="kw-2">*</span><span class="ident">rhs</span>))
}
}
};
}
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u8</span>, <span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">u8</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u8</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">u8</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">u8</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u8</span>, <span class="ident">usize</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i8</span>, <span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">i8</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i8</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">i8</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i8</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">i8</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i8</span>, <span class="ident">usize</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u16</span>, <span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">u16</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u16</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">u16</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">u16</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u16</span>, <span class="ident">usize</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i16</span>, <span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">i16</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i16</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">i16</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i16</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">i16</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i16</span>, <span class="ident">usize</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u32</span>, <span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">u32</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u32</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">u32</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">u32</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u32</span>, <span class="ident">usize</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i32</span>, <span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">i32</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i32</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">i32</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i32</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">i32</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i32</span>, <span class="ident">usize</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u64</span>, <span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">u64</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u64</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">u64</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u64</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">u64</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">u64</span>, <span class="ident">usize</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i64</span>, <span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">i64</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i64</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">i64</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i64</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">i64</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">i64</span>, <span class="ident">usize</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">usize</span>, <span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">usize</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">usize</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">usize</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">usize</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">usize</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">usize</span>, <span class="ident">usize</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">isize</span>, <span class="ident">u8</span>, <span class="ident">u32</span>, <span class="ident">isize</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">isize</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">isize</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">isize</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">isize</span>::<span class="ident">pow</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">isize</span>, <span class="ident">usize</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">Wrapping</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">Wrapping</span><span class="op"><</span><span class="ident">i8</span><span class="op">></span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">Wrapping</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">Wrapping</span><span class="op"><</span><span class="ident">i16</span><span class="op">></span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">Wrapping</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">Wrapping</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">Wrapping</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">Wrapping</span><span class="op"><</span><span class="ident">i64</span><span class="op">></span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">Wrapping</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">Wrapping</span><span class="op"><</span><span class="ident">isize</span><span class="op">></span>);
<span class="comment">// FIXME: these should be possible</span>
<span class="comment">// pow_impl!(u8, u64);</span>
<span class="comment">// pow_impl!(i16, u64);</span>
<span class="comment">// pow_impl!(i8, u64);</span>
<span class="comment">// pow_impl!(u16, u64);</span>
<span class="comment">// pow_impl!(u32, u64);</span>
<span class="comment">// pow_impl!(i32, u64);</span>
<span class="comment">// pow_impl!(u64, u64);</span>
<span class="comment">// pow_impl!(i64, u64);</span>
<span class="comment">// pow_impl!(usize, u64);</span>
<span class="comment">// pow_impl!(isize, u64);</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">float_impls</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Pow</span>;
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f32</span>, <span class="ident">i8</span>, <span class="ident">i32</span>, <span class="ident">f32</span>::<span class="ident">powi</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f32</span>, <span class="ident">u8</span>, <span class="ident">i32</span>, <span class="ident">f32</span>::<span class="ident">powi</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f32</span>, <span class="ident">i16</span>, <span class="ident">i32</span>, <span class="ident">f32</span>::<span class="ident">powi</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f32</span>, <span class="ident">u16</span>, <span class="ident">i32</span>, <span class="ident">f32</span>::<span class="ident">powi</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f32</span>, <span class="ident">i32</span>, <span class="ident">i32</span>, <span class="ident">f32</span>::<span class="ident">powi</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f64</span>, <span class="ident">i8</span>, <span class="ident">i32</span>, <span class="ident">f64</span>::<span class="ident">powi</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f64</span>, <span class="ident">u8</span>, <span class="ident">i32</span>, <span class="ident">f64</span>::<span class="ident">powi</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f64</span>, <span class="ident">i16</span>, <span class="ident">i32</span>, <span class="ident">f64</span>::<span class="ident">powi</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f64</span>, <span class="ident">u16</span>, <span class="ident">i32</span>, <span class="ident">f64</span>::<span class="ident">powi</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f64</span>, <span class="ident">i32</span>, <span class="ident">i32</span>, <span class="ident">f64</span>::<span class="ident">powi</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f32</span>, <span class="ident">f32</span>, <span class="ident">f32</span>, <span class="ident">f32</span>::<span class="ident">powf</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f64</span>, <span class="ident">f32</span>, <span class="ident">f64</span>, <span class="ident">f64</span>::<span class="ident">powf</span>);
<span class="macro">pow_impl</span><span class="macro">!</span>(<span class="ident">f64</span>, <span class="ident">f64</span>, <span class="ident">f64</span>, <span class="ident">f64</span>::<span class="ident">powf</span>);
}
<span class="doccomment">/// Raises a value to the power of exp, using exponentiation by squaring.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use num_traits::pow;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(pow(2i8, 4), 16);</span>
<span class="doccomment">/// assert_eq!(pow(6u8, 3), 216);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pow</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">One</span> <span class="op">+</span> <span class="ident">Mul</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">T</span><span class="op">>></span>(<span class="kw-2">mut</span> <span class="ident">base</span>: <span class="ident">T</span>, <span class="kw-2">mut</span> <span class="ident">exp</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">if</span> <span class="ident">exp</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="ident">T</span>::<span class="ident">one</span>() }
<span class="kw">while</span> <span class="ident">exp</span> <span class="op">&</span> <span class="number">1</span> <span class="op">==</span> <span class="number">0</span> {
<span class="ident">base</span> <span class="op">=</span> <span class="ident">base</span>.<span class="ident">clone</span>() <span class="op">*</span> <span class="ident">base</span>;
<span class="ident">exp</span> <span class="op">>>=</span> <span class="number">1</span>;
}
<span class="kw">if</span> <span class="ident">exp</span> <span class="op">==</span> <span class="number">1</span> { <span class="kw">return</span> <span class="ident">base</span> }
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">acc</span> <span class="op">=</span> <span class="ident">base</span>.<span class="ident">clone</span>();
<span class="kw">while</span> <span class="ident">exp</span> <span class="op">></span> <span class="number">1</span> {
<span class="ident">exp</span> <span class="op">>>=</span> <span class="number">1</span>;
<span class="ident">base</span> <span class="op">=</span> <span class="ident">base</span>.<span class="ident">clone</span>() <span class="op">*</span> <span class="ident">base</span>;
<span class="kw">if</span> <span class="ident">exp</span> <span class="op">&</span> <span class="number">1</span> <span class="op">==</span> <span class="number">1</span> {
<span class="ident">acc</span> <span class="op">=</span> <span class="ident">acc</span> <span class="op">*</span> <span class="ident">base</span>.<span class="ident">clone</span>();
}
}
<span class="ident">acc</span>
}
<span class="doccomment">/// Raises a value to the power of exp, returning `None` if an overflow occurred.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Otherwise same as the `pow` function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use num_traits::checked_pow;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(checked_pow(2i8, 4), Some(16));</span>
<span class="doccomment">/// assert_eq!(checked_pow(7i8, 8), None);</span>
<span class="doccomment">/// assert_eq!(checked_pow(7u32, 8), Some(5_764_801));</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">checked_pow</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">One</span> <span class="op">+</span> <span class="ident">CheckedMul</span><span class="op">></span>(<span class="kw-2">mut</span> <span class="ident">base</span>: <span class="ident">T</span>, <span class="kw-2">mut</span> <span class="ident">exp</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">exp</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">T</span>::<span class="ident">one</span>()) }
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">optry</span> {
( $ <span class="ident">expr</span> : <span class="ident">expr</span> ) <span class="op">=></span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">val</span>) <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span> { <span class="ident">val</span> } <span class="kw">else</span> { <span class="kw">return</span> <span class="prelude-val">None</span> }
}
}
<span class="kw">while</span> <span class="ident">exp</span> <span class="op">&</span> <span class="number">1</span> <span class="op">==</span> <span class="number">0</span> {
<span class="ident">base</span> <span class="op">=</span> <span class="macro">optry</span><span class="macro">!</span>(<span class="ident">base</span>.<span class="ident">checked_mul</span>(<span class="kw-2">&</span><span class="ident">base</span>));
<span class="ident">exp</span> <span class="op">>>=</span> <span class="number">1</span>;
}
<span class="kw">if</span> <span class="ident">exp</span> <span class="op">==</span> <span class="number">1</span> { <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">base</span>) }
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">acc</span> <span class="op">=</span> <span class="ident">base</span>.<span class="ident">clone</span>();
<span class="kw">while</span> <span class="ident">exp</span> <span class="op">></span> <span class="number">1</span> {
<span class="ident">exp</span> <span class="op">>>=</span> <span class="number">1</span>;
<span class="ident">base</span> <span class="op">=</span> <span class="macro">optry</span><span class="macro">!</span>(<span class="ident">base</span>.<span class="ident">checked_mul</span>(<span class="kw-2">&</span><span class="ident">base</span>));
<span class="kw">if</span> <span class="ident">exp</span> <span class="op">&</span> <span class="number">1</span> <span class="op">==</span> <span class="number">1</span> {
<span class="ident">acc</span> <span class="op">=</span> <span class="macro">optry</span><span class="macro">!</span>(<span class="ident">acc</span>.<span class="ident">checked_mul</span>(<span class="kw-2">&</span><span class="ident">base</span>));
}
}
<span class="prelude-val">Some</span>(<span class="ident">acc</span>)
}
</pre>
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