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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">Add</span>, <span class="ident">Sub</span>, <span class="ident">Mul</span>, <span class="ident">Div</span>, <span class="ident">Shl</span>, <span class="ident">Shr</span>};
<span class="doccomment">/// Performs addition that returns `None` instead of wrapping around on</span>
<span class="doccomment">/// overflow.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">CheckedAdd</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Add</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">Output</span><span class="op">=</span><span class="self">Self</span><span class="op">></span> {
<span class="doccomment">/// Adds two numbers, checking for overflow. If overflow happens, `None` is</span>
<span class="doccomment">/// returned.</span>
<span class="kw">fn</span> <span class="ident">checked_add</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">v</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>;
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">checked_impl</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">trait_name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span>) <span class="op">=></span> {
<span class="kw">impl</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">trait_name</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">v</span>: <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span> {
<span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">*</span><span class="ident">v</span>)
}
}
}
}
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedAdd</span>, <span class="ident">checked_add</span>, <span class="ident">u8</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedAdd</span>, <span class="ident">checked_add</span>, <span class="ident">u16</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedAdd</span>, <span class="ident">checked_add</span>, <span class="ident">u32</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedAdd</span>, <span class="ident">checked_add</span>, <span class="ident">u64</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedAdd</span>, <span class="ident">checked_add</span>, <span class="ident">usize</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedAdd</span>, <span class="ident">checked_add</span>, <span class="ident">i8</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedAdd</span>, <span class="ident">checked_add</span>, <span class="ident">i16</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedAdd</span>, <span class="ident">checked_add</span>, <span class="ident">i32</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedAdd</span>, <span class="ident">checked_add</span>, <span class="ident">i64</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedAdd</span>, <span class="ident">checked_add</span>, <span class="ident">isize</span>);
<span class="doccomment">/// Performs subtraction that returns `None` instead of wrapping around on underflow.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">CheckedSub</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Sub</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">Output</span><span class="op">=</span><span class="self">Self</span><span class="op">></span> {
<span class="doccomment">/// Subtracts two numbers, checking for underflow. If underflow happens,</span>
<span class="doccomment">/// `None` is returned.</span>
<span class="kw">fn</span> <span class="ident">checked_sub</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">v</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>;
}
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedSub</span>, <span class="ident">checked_sub</span>, <span class="ident">u8</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedSub</span>, <span class="ident">checked_sub</span>, <span class="ident">u16</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedSub</span>, <span class="ident">checked_sub</span>, <span class="ident">u32</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedSub</span>, <span class="ident">checked_sub</span>, <span class="ident">u64</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedSub</span>, <span class="ident">checked_sub</span>, <span class="ident">usize</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedSub</span>, <span class="ident">checked_sub</span>, <span class="ident">i8</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedSub</span>, <span class="ident">checked_sub</span>, <span class="ident">i16</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedSub</span>, <span class="ident">checked_sub</span>, <span class="ident">i32</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedSub</span>, <span class="ident">checked_sub</span>, <span class="ident">i64</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedSub</span>, <span class="ident">checked_sub</span>, <span class="ident">isize</span>);
<span class="doccomment">/// Performs multiplication that returns `None` instead of wrapping around on underflow or</span>
<span class="doccomment">/// overflow.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">CheckedMul</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Mul</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">Output</span><span class="op">=</span><span class="self">Self</span><span class="op">></span> {
<span class="doccomment">/// Multiplies two numbers, checking for underflow or overflow. If underflow</span>
<span class="doccomment">/// or overflow happens, `None` is returned.</span>
<span class="kw">fn</span> <span class="ident">checked_mul</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">v</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>;
}
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedMul</span>, <span class="ident">checked_mul</span>, <span class="ident">u8</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedMul</span>, <span class="ident">checked_mul</span>, <span class="ident">u16</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedMul</span>, <span class="ident">checked_mul</span>, <span class="ident">u32</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedMul</span>, <span class="ident">checked_mul</span>, <span class="ident">u64</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedMul</span>, <span class="ident">checked_mul</span>, <span class="ident">usize</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedMul</span>, <span class="ident">checked_mul</span>, <span class="ident">i8</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedMul</span>, <span class="ident">checked_mul</span>, <span class="ident">i16</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedMul</span>, <span class="ident">checked_mul</span>, <span class="ident">i32</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedMul</span>, <span class="ident">checked_mul</span>, <span class="ident">i64</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedMul</span>, <span class="ident">checked_mul</span>, <span class="ident">isize</span>);
<span class="doccomment">/// Performs division that returns `None` instead of panicking on division by zero and instead of</span>
<span class="doccomment">/// wrapping around on underflow and overflow.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">CheckedDiv</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Div</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">Output</span><span class="op">=</span><span class="self">Self</span><span class="op">></span> {
<span class="doccomment">/// Divides two numbers, checking for underflow, overflow and division by</span>
<span class="doccomment">/// zero. If any of that happens, `None` is returned.</span>
<span class="kw">fn</span> <span class="ident">checked_div</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">v</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>;
}
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedDiv</span>, <span class="ident">checked_div</span>, <span class="ident">u8</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedDiv</span>, <span class="ident">checked_div</span>, <span class="ident">u16</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedDiv</span>, <span class="ident">checked_div</span>, <span class="ident">u32</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedDiv</span>, <span class="ident">checked_div</span>, <span class="ident">u64</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedDiv</span>, <span class="ident">checked_div</span>, <span class="ident">usize</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedDiv</span>, <span class="ident">checked_div</span>, <span class="ident">i8</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedDiv</span>, <span class="ident">checked_div</span>, <span class="ident">i16</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedDiv</span>, <span class="ident">checked_div</span>, <span class="ident">i32</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedDiv</span>, <span class="ident">checked_div</span>, <span class="ident">i64</span>);
<span class="macro">checked_impl</span><span class="macro">!</span>(<span class="ident">CheckedDiv</span>, <span class="ident">checked_div</span>, <span class="ident">isize</span>);
<span class="doccomment">/// Performs a left shift that returns `None` on overflow.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">CheckedShl</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Shl</span><span class="op"><</span><span class="ident">u32</span>, <span class="ident">Output</span><span class="op">=</span><span class="self">Self</span><span class="op">></span> {
<span class="doccomment">/// Shifts a number to the left, checking for overflow. If overflow happens,</span>
<span class="doccomment">/// `None` is returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use num_traits::CheckedShl;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let x: u16 = 0x0001;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(CheckedShl::checked_shl(&x, 0), Some(0x0001));</span>
<span class="doccomment">/// assert_eq!(CheckedShl::checked_shl(&x, 1), Some(0x0002));</span>
<span class="doccomment">/// assert_eq!(CheckedShl::checked_shl(&x, 15), Some(0x8000));</span>
<span class="doccomment">/// assert_eq!(CheckedShl::checked_shl(&x, 16), None);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">checked_shl</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>;
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">checked_shift_impl</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">trait_name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span>) <span class="op">=></span> {
<span class="kw">impl</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">trait_name</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span> {
<span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="ident">rhs</span>)
}
}
}
}
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShl</span>, <span class="ident">checked_shl</span>, <span class="ident">u8</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShl</span>, <span class="ident">checked_shl</span>, <span class="ident">u16</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShl</span>, <span class="ident">checked_shl</span>, <span class="ident">u32</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShl</span>, <span class="ident">checked_shl</span>, <span class="ident">u64</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShl</span>, <span class="ident">checked_shl</span>, <span class="ident">usize</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShl</span>, <span class="ident">checked_shl</span>, <span class="ident">i8</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShl</span>, <span class="ident">checked_shl</span>, <span class="ident">i16</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShl</span>, <span class="ident">checked_shl</span>, <span class="ident">i32</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShl</span>, <span class="ident">checked_shl</span>, <span class="ident">i64</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShl</span>, <span class="ident">checked_shl</span>, <span class="ident">isize</span>);
<span class="doccomment">/// Performs a right shift that returns `None` on overflow.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">CheckedShr</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Shr</span><span class="op"><</span><span class="ident">u32</span>, <span class="ident">Output</span><span class="op">=</span><span class="self">Self</span><span class="op">></span> {
<span class="doccomment">/// Shifts a number to the left, checking for overflow. If overflow happens,</span>
<span class="doccomment">/// `None` is returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use num_traits::CheckedShr;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let x: u16 = 0x8000;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(CheckedShr::checked_shr(&x, 0), Some(0x8000));</span>
<span class="doccomment">/// assert_eq!(CheckedShr::checked_shr(&x, 1), Some(0x4000));</span>
<span class="doccomment">/// assert_eq!(CheckedShr::checked_shr(&x, 15), Some(0x0001));</span>
<span class="doccomment">/// assert_eq!(CheckedShr::checked_shr(&x, 16), None);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">checked_shr</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>;
}
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShr</span>, <span class="ident">checked_shr</span>, <span class="ident">u8</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShr</span>, <span class="ident">checked_shr</span>, <span class="ident">u16</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShr</span>, <span class="ident">checked_shr</span>, <span class="ident">u32</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShr</span>, <span class="ident">checked_shr</span>, <span class="ident">u64</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShr</span>, <span class="ident">checked_shr</span>, <span class="ident">usize</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShr</span>, <span class="ident">checked_shr</span>, <span class="ident">i8</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShr</span>, <span class="ident">checked_shr</span>, <span class="ident">i16</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShr</span>, <span class="ident">checked_shr</span>, <span class="ident">i32</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShr</span>, <span class="ident">checked_shr</span>, <span class="ident">i64</span>);
<span class="macro">checked_shift_impl</span><span class="macro">!</span>(<span class="ident">CheckedShr</span>, <span class="ident">checked_shr</span>, <span class="ident">isize</span>);
</pre>
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