| <!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/saturating.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>saturating.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, Mul, Sub}; |
| |
| <span class="doccomment">/// Saturating math operations. Deprecated, use `SaturatingAdd`, `SaturatingSub` and |
| /// `SaturatingMul` instead. |
| </span><span class="kw">pub trait </span>Saturating { |
| <span class="doccomment">/// Saturating addition operator. |
| /// Returns a+b, saturating at the numeric bounds instead of overflowing. |
| </span><span class="kw">fn </span>saturating_add(<span class="self">self</span>, v: <span class="self">Self</span>) -> <span class="self">Self</span>; |
| |
| <span class="doccomment">/// Saturating subtraction operator. |
| /// Returns a-b, saturating at the numeric bounds instead of overflowing. |
| </span><span class="kw">fn </span>saturating_sub(<span class="self">self</span>, v: <span class="self">Self</span>) -> <span class="self">Self</span>; |
| } |
| |
| <span class="macro">macro_rules! </span>deprecated_saturating_impl { |
| (<span class="macro-nonterminal">$trait_name</span>:ident <span class="kw">for </span>$(<span class="macro-nonterminal">$t</span>:ty)<span class="kw-2">*</span>) => {$( |
| <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>saturating_add(<span class="self">self</span>, v: <span class="self">Self</span>) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::saturating_add(<span class="self">self</span>, v) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>saturating_sub(<span class="self">self</span>, v: <span class="self">Self</span>) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::saturating_sub(<span class="self">self</span>, v) |
| } |
| } |
| )<span class="kw-2">*</span>} |
| } |
| |
| <span class="macro">deprecated_saturating_impl!</span>(Saturating <span class="kw">for </span>isize usize i8 u8 i16 u16 i32 u32 i64 u64); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">deprecated_saturating_impl!</span>(Saturating <span class="kw">for </span>i128 u128); |
| |
| <span class="macro">macro_rules! </span>saturating_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="self">Self</span>) -> <span class="self">Self </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="doccomment">/// Performs addition that saturates at the numeric bounds instead of overflowing. |
| </span><span class="kw">pub trait </span>SaturatingAdd: Sized + Add<<span class="self">Self</span>, Output = <span class="self">Self</span>> { |
| <span class="doccomment">/// Saturating addition. Computes `self + other`, saturating at the relevant high or low boundary of |
| /// the type. |
| </span><span class="kw">fn </span>saturating_add(<span class="kw-2">&</span><span class="self">self</span>, v: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="self">Self</span>; |
| } |
| |
| <span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, u8); |
| <span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, u16); |
| <span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, u32); |
| <span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, u64); |
| <span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, u128); |
| |
| <span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, i8); |
| <span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, i16); |
| <span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, i32); |
| <span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, i64); |
| <span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">saturating_impl!</span>(SaturatingAdd, saturating_add, i128); |
| |
| <span class="doccomment">/// Performs subtraction that saturates at the numeric bounds instead of overflowing. |
| </span><span class="kw">pub trait </span>SaturatingSub: Sized + Sub<<span class="self">Self</span>, Output = <span class="self">Self</span>> { |
| <span class="doccomment">/// Saturating subtraction. Computes `self - other`, saturating at the relevant high or low boundary of |
| /// the type. |
| </span><span class="kw">fn </span>saturating_sub(<span class="kw-2">&</span><span class="self">self</span>, v: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="self">Self</span>; |
| } |
| |
| <span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, u8); |
| <span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, u16); |
| <span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, u32); |
| <span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, u64); |
| <span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, u128); |
| |
| <span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, i8); |
| <span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, i16); |
| <span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, i32); |
| <span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, i64); |
| <span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">saturating_impl!</span>(SaturatingSub, saturating_sub, i128); |
| |
| <span class="doccomment">/// Performs multiplication that saturates at the numeric bounds instead of overflowing. |
| </span><span class="kw">pub trait </span>SaturatingMul: Sized + Mul<<span class="self">Self</span>, Output = <span class="self">Self</span>> { |
| <span class="doccomment">/// Saturating multiplication. Computes `self * other`, saturating at the relevant high or low boundary of |
| /// the type. |
| </span><span class="kw">fn </span>saturating_mul(<span class="kw-2">&</span><span class="self">self</span>, v: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="self">Self</span>; |
| } |
| |
| <span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, u8); |
| <span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, u16); |
| <span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, u32); |
| <span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, u64); |
| <span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, usize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, u128); |
| |
| <span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, i8); |
| <span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, i16); |
| <span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, i32); |
| <span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, i64); |
| <span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, isize); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">saturating_impl!</span>(SaturatingMul, saturating_mul, i128); |
| |
| <span class="comment">// TODO: add SaturatingNeg for signed integer primitives once the saturating_neg() API is stable. |
| |
| </span><span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_saturating_traits() { |
| <span class="kw">fn </span>saturating_add<T: SaturatingAdd>(a: T, b: T) -> T { |
| a.saturating_add(<span class="kw-2">&</span>b) |
| } |
| <span class="kw">fn </span>saturating_sub<T: SaturatingSub>(a: T, b: T) -> T { |
| a.saturating_sub(<span class="kw-2">&</span>b) |
| } |
| <span class="kw">fn </span>saturating_mul<T: SaturatingMul>(a: T, b: T) -> T { |
| a.saturating_mul(<span class="kw-2">&</span>b) |
| } |
| <span class="macro">assert_eq!</span>(saturating_add(<span class="number">255</span>, <span class="number">1</span>), <span class="number">255u8</span>); |
| <span class="macro">assert_eq!</span>(saturating_add(<span class="number">127</span>, <span class="number">1</span>), <span class="number">127i8</span>); |
| <span class="macro">assert_eq!</span>(saturating_add(-<span class="number">128</span>, -<span class="number">1</span>), -<span class="number">128i8</span>); |
| <span class="macro">assert_eq!</span>(saturating_sub(<span class="number">0</span>, <span class="number">1</span>), <span class="number">0u8</span>); |
| <span class="macro">assert_eq!</span>(saturating_sub(-<span class="number">128</span>, <span class="number">1</span>), -<span class="number">128i8</span>); |
| <span class="macro">assert_eq!</span>(saturating_sub(<span class="number">127</span>, -<span class="number">1</span>), <span class="number">127i8</span>); |
| <span class="macro">assert_eq!</span>(saturating_mul(<span class="number">255</span>, <span class="number">2</span>), <span class="number">255u8</span>); |
| <span class="macro">assert_eq!</span>(saturating_mul(<span class="number">127</span>, <span class="number">2</span>), <span class="number">127i8</span>); |
| <span class="macro">assert_eq!</span>(saturating_mul(-<span class="number">128</span>, <span class="number">2</span>), -<span class="number">128i8</span>); |
| } |
| </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> |