| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/num-traits-0.2.15/src/ops/checked.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>checked.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../num_traits/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../num_traits/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>core::ops::{Add, Div, Mul, Rem, Shl, Shr, Sub}; |
| |
| <span class="doccomment">/// Performs addition that returns `None` instead of wrapping around on |
| /// overflow. |
| </span><span class="kw">pub trait </span>CheckedAdd: Sized + Add<<span class="self">Self</span>, Output = <span class="self">Self</span>> { |
| <span class="doccomment">/// Adds two numbers, checking for overflow. If overflow happens, `None` is |
| /// returned. |
| </span><span class="kw">fn </span>checked_add(<span class="kw-2">&</span><span class="self">self</span>, v: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| } |
| |
| <span class="macro">macro_rules! </span>checked_impl { |
| (<span class="macro-nonterminal">$trait_name</span>:ident, <span class="macro-nonterminal">$method</span>:ident, <span class="macro-nonterminal">$t</span>:ty) => { |
| <span class="kw">impl </span><span class="macro-nonterminal">$trait_name </span><span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span><span class="macro-nonterminal">$method</span>(<span class="kw-2">&</span><span class="self">self</span>, v: <span class="kw-2">&</span><span class="macro-nonterminal">$t</span>) -> <span class="prelude-ty">Option</span><<span class="macro-nonterminal">$t</span>> { |
| <<span class="macro-nonterminal">$t</span>>::<span class="macro-nonterminal">$method</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">*</span>v) |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">checked_impl!</span>(CheckedAdd, checked_add, u8); |
| <span class="macro">checked_impl!</span>(CheckedAdd, checked_add, u16); |
| <span class="macro">checked_impl!</span>(CheckedAdd, checked_add, u32); |
| <span class="macro">checked_impl!</span>(CheckedAdd, checked_add, u64); |
| <span class="macro">checked_impl!</span>(CheckedAdd, checked_add, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl!</span>(CheckedAdd, checked_add, u128); |
| |
| <span class="macro">checked_impl!</span>(CheckedAdd, checked_add, i8); |
| <span class="macro">checked_impl!</span>(CheckedAdd, checked_add, i16); |
| <span class="macro">checked_impl!</span>(CheckedAdd, checked_add, i32); |
| <span class="macro">checked_impl!</span>(CheckedAdd, checked_add, i64); |
| <span class="macro">checked_impl!</span>(CheckedAdd, checked_add, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl!</span>(CheckedAdd, checked_add, i128); |
| |
| <span class="doccomment">/// Performs subtraction that returns `None` instead of wrapping around on underflow. |
| </span><span class="kw">pub trait </span>CheckedSub: Sized + Sub<<span class="self">Self</span>, Output = <span class="self">Self</span>> { |
| <span class="doccomment">/// Subtracts two numbers, checking for underflow. If underflow happens, |
| /// `None` is returned. |
| </span><span class="kw">fn </span>checked_sub(<span class="kw-2">&</span><span class="self">self</span>, v: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| } |
| |
| <span class="macro">checked_impl!</span>(CheckedSub, checked_sub, u8); |
| <span class="macro">checked_impl!</span>(CheckedSub, checked_sub, u16); |
| <span class="macro">checked_impl!</span>(CheckedSub, checked_sub, u32); |
| <span class="macro">checked_impl!</span>(CheckedSub, checked_sub, u64); |
| <span class="macro">checked_impl!</span>(CheckedSub, checked_sub, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl!</span>(CheckedSub, checked_sub, u128); |
| |
| <span class="macro">checked_impl!</span>(CheckedSub, checked_sub, i8); |
| <span class="macro">checked_impl!</span>(CheckedSub, checked_sub, i16); |
| <span class="macro">checked_impl!</span>(CheckedSub, checked_sub, i32); |
| <span class="macro">checked_impl!</span>(CheckedSub, checked_sub, i64); |
| <span class="macro">checked_impl!</span>(CheckedSub, checked_sub, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl!</span>(CheckedSub, checked_sub, i128); |
| |
| <span class="doccomment">/// Performs multiplication that returns `None` instead of wrapping around on underflow or |
| /// overflow. |
| </span><span class="kw">pub trait </span>CheckedMul: Sized + Mul<<span class="self">Self</span>, Output = <span class="self">Self</span>> { |
| <span class="doccomment">/// Multiplies two numbers, checking for underflow or overflow. If underflow |
| /// or overflow happens, `None` is returned. |
| </span><span class="kw">fn </span>checked_mul(<span class="kw-2">&</span><span class="self">self</span>, v: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| } |
| |
| <span class="macro">checked_impl!</span>(CheckedMul, checked_mul, u8); |
| <span class="macro">checked_impl!</span>(CheckedMul, checked_mul, u16); |
| <span class="macro">checked_impl!</span>(CheckedMul, checked_mul, u32); |
| <span class="macro">checked_impl!</span>(CheckedMul, checked_mul, u64); |
| <span class="macro">checked_impl!</span>(CheckedMul, checked_mul, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl!</span>(CheckedMul, checked_mul, u128); |
| |
| <span class="macro">checked_impl!</span>(CheckedMul, checked_mul, i8); |
| <span class="macro">checked_impl!</span>(CheckedMul, checked_mul, i16); |
| <span class="macro">checked_impl!</span>(CheckedMul, checked_mul, i32); |
| <span class="macro">checked_impl!</span>(CheckedMul, checked_mul, i64); |
| <span class="macro">checked_impl!</span>(CheckedMul, checked_mul, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl!</span>(CheckedMul, checked_mul, i128); |
| |
| <span class="doccomment">/// Performs division that returns `None` instead of panicking on division by zero and instead of |
| /// wrapping around on underflow and overflow. |
| </span><span class="kw">pub trait </span>CheckedDiv: Sized + Div<<span class="self">Self</span>, Output = <span class="self">Self</span>> { |
| <span class="doccomment">/// Divides two numbers, checking for underflow, overflow and division by |
| /// zero. If any of that happens, `None` is returned. |
| </span><span class="kw">fn </span>checked_div(<span class="kw-2">&</span><span class="self">self</span>, v: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| } |
| |
| <span class="macro">checked_impl!</span>(CheckedDiv, checked_div, u8); |
| <span class="macro">checked_impl!</span>(CheckedDiv, checked_div, u16); |
| <span class="macro">checked_impl!</span>(CheckedDiv, checked_div, u32); |
| <span class="macro">checked_impl!</span>(CheckedDiv, checked_div, u64); |
| <span class="macro">checked_impl!</span>(CheckedDiv, checked_div, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl!</span>(CheckedDiv, checked_div, u128); |
| |
| <span class="macro">checked_impl!</span>(CheckedDiv, checked_div, i8); |
| <span class="macro">checked_impl!</span>(CheckedDiv, checked_div, i16); |
| <span class="macro">checked_impl!</span>(CheckedDiv, checked_div, i32); |
| <span class="macro">checked_impl!</span>(CheckedDiv, checked_div, i64); |
| <span class="macro">checked_impl!</span>(CheckedDiv, checked_div, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl!</span>(CheckedDiv, checked_div, i128); |
| |
| <span class="doccomment">/// Performs an integral remainder that returns `None` instead of panicking on division by zero and |
| /// instead of wrapping around on underflow and overflow. |
| </span><span class="kw">pub trait </span>CheckedRem: Sized + Rem<<span class="self">Self</span>, Output = <span class="self">Self</span>> { |
| <span class="doccomment">/// Finds the remainder of dividing two numbers, checking for underflow, overflow and division |
| /// by zero. If any of that happens, `None` is returned. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use num_traits::CheckedRem; |
| /// use std::i32::MIN; |
| /// |
| /// assert_eq!(CheckedRem::checked_rem(&10, &7), Some(3)); |
| /// assert_eq!(CheckedRem::checked_rem(&10, &-7), Some(3)); |
| /// assert_eq!(CheckedRem::checked_rem(&-10, &7), Some(-3)); |
| /// assert_eq!(CheckedRem::checked_rem(&-10, &-7), Some(-3)); |
| /// |
| /// assert_eq!(CheckedRem::checked_rem(&10, &0), None); |
| /// |
| /// assert_eq!(CheckedRem::checked_rem(&MIN, &1), Some(0)); |
| /// assert_eq!(CheckedRem::checked_rem(&MIN, &-1), None); |
| /// ``` |
| </span><span class="kw">fn </span>checked_rem(<span class="kw-2">&</span><span class="self">self</span>, v: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| } |
| |
| <span class="macro">checked_impl!</span>(CheckedRem, checked_rem, u8); |
| <span class="macro">checked_impl!</span>(CheckedRem, checked_rem, u16); |
| <span class="macro">checked_impl!</span>(CheckedRem, checked_rem, u32); |
| <span class="macro">checked_impl!</span>(CheckedRem, checked_rem, u64); |
| <span class="macro">checked_impl!</span>(CheckedRem, checked_rem, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl!</span>(CheckedRem, checked_rem, u128); |
| |
| <span class="macro">checked_impl!</span>(CheckedRem, checked_rem, i8); |
| <span class="macro">checked_impl!</span>(CheckedRem, checked_rem, i16); |
| <span class="macro">checked_impl!</span>(CheckedRem, checked_rem, i32); |
| <span class="macro">checked_impl!</span>(CheckedRem, checked_rem, i64); |
| <span class="macro">checked_impl!</span>(CheckedRem, checked_rem, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl!</span>(CheckedRem, checked_rem, i128); |
| |
| <span class="macro">macro_rules! </span>checked_impl_unary { |
| (<span class="macro-nonterminal">$trait_name</span>:ident, <span class="macro-nonterminal">$method</span>:ident, <span class="macro-nonterminal">$t</span>:ty) => { |
| <span class="kw">impl </span><span class="macro-nonterminal">$trait_name </span><span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span><span class="macro-nonterminal">$method</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="macro-nonterminal">$t</span>> { |
| <<span class="macro-nonterminal">$t</span>>::<span class="macro-nonterminal">$method</span>(<span class="kw-2">*</span><span class="self">self</span>) |
| } |
| } |
| }; |
| } |
| |
| <span class="doccomment">/// Performs negation that returns `None` if the result can't be represented. |
| </span><span class="kw">pub trait </span>CheckedNeg: Sized { |
| <span class="doccomment">/// Negates a number, returning `None` for results that can't be represented, like signed `MIN` |
| /// values that can't be positive, or non-zero unsigned values that can't be negative. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use num_traits::CheckedNeg; |
| /// use std::i32::MIN; |
| /// |
| /// assert_eq!(CheckedNeg::checked_neg(&1_i32), Some(-1)); |
| /// assert_eq!(CheckedNeg::checked_neg(&-1_i32), Some(1)); |
| /// assert_eq!(CheckedNeg::checked_neg(&MIN), None); |
| /// |
| /// assert_eq!(CheckedNeg::checked_neg(&0_u32), Some(0)); |
| /// assert_eq!(CheckedNeg::checked_neg(&1_u32), None); |
| /// ``` |
| </span><span class="kw">fn </span>checked_neg(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| } |
| |
| <span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, u8); |
| <span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, u16); |
| <span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, u32); |
| <span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, u64); |
| <span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, u128); |
| |
| <span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, i8); |
| <span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, i16); |
| <span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, i32); |
| <span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, i64); |
| <span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_impl_unary!</span>(CheckedNeg, checked_neg, i128); |
| |
| <span class="doccomment">/// Performs a left shift that returns `None` on shifts larger than |
| /// the type width. |
| </span><span class="kw">pub trait </span>CheckedShl: Sized + Shl<u32, Output = <span class="self">Self</span>> { |
| <span class="doccomment">/// Checked shift left. Computes `self << rhs`, returning `None` |
| /// if `rhs` is larger than or equal to the number of bits in `self`. |
| /// |
| /// ``` |
| /// use num_traits::CheckedShl; |
| /// |
| /// let x: u16 = 0x0001; |
| /// |
| /// assert_eq!(CheckedShl::checked_shl(&x, 0), Some(0x0001)); |
| /// assert_eq!(CheckedShl::checked_shl(&x, 1), Some(0x0002)); |
| /// assert_eq!(CheckedShl::checked_shl(&x, 15), Some(0x8000)); |
| /// assert_eq!(CheckedShl::checked_shl(&x, 16), None); |
| /// ``` |
| </span><span class="kw">fn </span>checked_shl(<span class="kw-2">&</span><span class="self">self</span>, rhs: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| } |
| |
| <span class="macro">macro_rules! </span>checked_shift_impl { |
| (<span class="macro-nonterminal">$trait_name</span>:ident, <span class="macro-nonterminal">$method</span>:ident, <span class="macro-nonterminal">$t</span>:ty) => { |
| <span class="kw">impl </span><span class="macro-nonterminal">$trait_name </span><span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span><span class="macro-nonterminal">$method</span>(<span class="kw-2">&</span><span class="self">self</span>, rhs: u32) -> <span class="prelude-ty">Option</span><<span class="macro-nonterminal">$t</span>> { |
| <<span class="macro-nonterminal">$t</span>>::<span class="macro-nonterminal">$method</span>(<span class="kw-2">*</span><span class="self">self</span>, rhs) |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, u8); |
| <span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, u16); |
| <span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, u32); |
| <span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, u64); |
| <span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, u128); |
| |
| <span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, i8); |
| <span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, i16); |
| <span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, i32); |
| <span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, i64); |
| <span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_shift_impl!</span>(CheckedShl, checked_shl, i128); |
| |
| <span class="doccomment">/// Performs a right shift that returns `None` on shifts larger than |
| /// the type width. |
| </span><span class="kw">pub trait </span>CheckedShr: Sized + Shr<u32, Output = <span class="self">Self</span>> { |
| <span class="doccomment">/// Checked shift right. Computes `self >> rhs`, returning `None` |
| /// if `rhs` is larger than or equal to the number of bits in `self`. |
| /// |
| /// ``` |
| /// use num_traits::CheckedShr; |
| /// |
| /// let x: u16 = 0x8000; |
| /// |
| /// assert_eq!(CheckedShr::checked_shr(&x, 0), Some(0x8000)); |
| /// assert_eq!(CheckedShr::checked_shr(&x, 1), Some(0x4000)); |
| /// assert_eq!(CheckedShr::checked_shr(&x, 15), Some(0x0001)); |
| /// assert_eq!(CheckedShr::checked_shr(&x, 16), None); |
| /// ``` |
| </span><span class="kw">fn </span>checked_shr(<span class="kw-2">&</span><span class="self">self</span>, rhs: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| } |
| |
| <span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, u8); |
| <span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, u16); |
| <span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, u32); |
| <span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, u64); |
| <span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, u128); |
| |
| <span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, i8); |
| <span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, i16); |
| <span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, i32); |
| <span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, i64); |
| <span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">checked_shift_impl!</span>(CheckedShr, checked_shr, i128); |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="num_traits" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
