<!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 to the Rust file `libcore/ops/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 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class="rust "> <span class="comment">// Copyright 2012 The Rust Project Developers. See the COPYRIGHT</span> <span class="comment">// file at the top-level directory of this distribution and at</span> <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="doccomment">//! Overloadable operators.</span> <span class="doccomment">//!</span> <span class="doccomment">//! Implementing these traits allows you to overload certain operators.</span> <span class="doccomment">//!</span> <span class="doccomment">//! Some of these traits are imported by the prelude, so they are available in</span> <span class="doccomment">//! every Rust program. Only operators backed by traits can be overloaded. For</span> <span class="doccomment">//! example, the addition operator (`+`) can be overloaded through the [`Add`]</span> <span class="doccomment">//! trait, but since the assignment operator (`=`) has no backing trait, there</span> <span class="doccomment">//! is no way of overloading its semantics. Additionally, this module does not</span> <span class="doccomment">//! provide any mechanism to create new operators. If traitless overloading or</span> <span class="doccomment">//! custom operators are required, you should look toward macros or compiler</span> <span class="doccomment">//! plugins to extend Rust's syntax.</span> <span class="doccomment">//!</span> <span class="doccomment">//! Implementations of operator traits should be unsurprising in their</span> <span class="doccomment">//! respective contexts, keeping in mind their usual meanings and</span> <span class="doccomment">//! [operator precedence]. For example, when implementing [`Mul`], the operation</span> <span class="doccomment">//! should have some resemblance to multiplication (and share expected</span> <span class="doccomment">//! properties like associativity).</span> <span class="doccomment">//!</span> <span class="doccomment">//! Note that the `&&` and `||` operators short-circuit, i.e. they only</span> <span class="doccomment">//! evaluate their second operand if it contributes to the result. Since this</span> <span class="doccomment">//! behavior is not enforceable by traits, `&&` and `||` are not supported as</span> <span class="doccomment">//! overloadable operators.</span> <span class="doccomment">//!</span> <span class="doccomment">//! Many of the operators take their operands by value. In non-generic</span> <span class="doccomment">//! contexts involving built-in types, this is usually not a problem.</span> <span class="doccomment">//! However, using these operators in generic code, requires some</span> <span class="doccomment">//! attention if values have to be reused as opposed to letting the operators</span> <span class="doccomment">//! consume them. One option is to occasionally use [`clone`].</span> <span class="doccomment">//! Another option is to rely on the types involved providing additional</span> <span class="doccomment">//! operator implementations for references. For example, for a user-defined</span> <span class="doccomment">//! type `T` which is supposed to support addition, it is probably a good</span> <span class="doccomment">//! idea to have both `T` and `&T` implement the traits [`Add<T>`][`Add`] and</span> <span class="doccomment">//! [`Add<&T>`][`Add`] so that generic code can be written without unnecessary</span> <span class="doccomment">//! cloning.</span> <span class="doccomment">//!</span> <span class="doccomment">//! # Examples</span> <span class="doccomment">//!</span> <span class="doccomment">//! This example creates a `Point` struct that implements [`Add`] and [`Sub`],</span> <span class="doccomment">//! and then demonstrates adding and subtracting two `Point`s.</span> <span class="doccomment">//!</span> <span class="doccomment">//! ```rust</span> <span class="doccomment">//! use std::ops::{Add, Sub};</span> <span class="doccomment">//!</span> <span class="doccomment">//! #[derive(Debug, PartialEq)]</span> <span class="doccomment">//! struct Point {</span> <span class="doccomment">//! x: i32,</span> <span class="doccomment">//! y: i32,</span> <span class="doccomment">//! }</span> <span class="doccomment">//!</span> <span class="doccomment">//! impl Add for Point {</span> <span class="doccomment">//! type Output = Point;</span> <span class="doccomment">//!</span> <span class="doccomment">//! fn add(self, other: Point) -> Point {</span> <span class="doccomment">//! Point {x: self.x + other.x, y: self.y + other.y}</span> <span class="doccomment">//! }</span> <span class="doccomment">//! }</span> <span class="doccomment">//!</span> <span class="doccomment">//! impl Sub for Point {</span> <span class="doccomment">//! type Output = Point;</span> <span class="doccomment">//!</span> <span class="doccomment">//! fn sub(self, other: Point) -> Point {</span> <span class="doccomment">//! Point {x: self.x - other.x, y: self.y - other.y}</span> <span class="doccomment">//! }</span> <span class="doccomment">//! }</span> <span class="doccomment">//!</span> <span class="doccomment">//! assert_eq!(Point {x: 3, y: 3}, Point {x: 1, y: 0} + Point {x: 2, y: 3});</span> <span class="doccomment">//! assert_eq!(Point {x: -1, y: -3}, Point {x: 1, y: 0} - Point {x: 2, y: 3});</span> <span class="doccomment">//! ```</span> <span class="doccomment">//!</span> <span class="doccomment">//! See the documentation for each trait for an example implementation.</span> <span class="doccomment">//!</span> <span class="doccomment">//! The [`Fn`], [`FnMut`], and [`FnOnce`] traits are implemented by types that can be</span> <span class="doccomment">//! invoked like functions. Note that [`Fn`] takes `&self`, [`FnMut`] takes `&mut</span> <span class="doccomment">//! self` and [`FnOnce`] takes `self`. These correspond to the three kinds of</span> <span class="doccomment">//! methods that can be invoked on an instance: call-by-reference,</span> <span class="doccomment">//! call-by-mutable-reference, and call-by-value. The most common use of these</span> <span class="doccomment">//! traits is to act as bounds to higher-level functions that take functions or</span> <span class="doccomment">//! closures as arguments.</span> <span class="doccomment">//!</span> <span class="doccomment">//! Taking a [`Fn`] as a parameter:</span> <span class="doccomment">//!</span> <span class="doccomment">//! ```rust</span> <span class="doccomment">//! fn call_with_one<F>(func: F) -> usize</span> <span class="doccomment">//! where F: Fn(usize) -> usize</span> <span class="doccomment">//! {</span> <span class="doccomment">//! func(1)</span> <span class="doccomment">//! }</span> <span class="doccomment">//!</span> <span class="doccomment">//! let double = |x| x * 2;</span> <span class="doccomment">//! assert_eq!(call_with_one(double), 2);</span> <span class="doccomment">//! ```</span> <span class="doccomment">//!</span> <span class="doccomment">//! Taking a [`FnMut`] as a parameter:</span> <span class="doccomment">//!</span> <span class="doccomment">//! ```rust</span> <span class="doccomment">//! fn do_twice<F>(mut func: F)</span> <span class="doccomment">//! where F: FnMut()</span> <span class="doccomment">//! {</span> <span class="doccomment">//! func();</span> <span class="doccomment">//! func();</span> <span class="doccomment">//! }</span> <span class="doccomment">//!</span> <span class="doccomment">//! let mut x: usize = 1;</span> <span class="doccomment">//! {</span> <span class="doccomment">//! let add_two_to_x = || x += 2;</span> <span class="doccomment">//! do_twice(add_two_to_x);</span> <span class="doccomment">//! }</span> <span class="doccomment">//!</span> <span class="doccomment">//! assert_eq!(x, 5);</span> <span class="doccomment">//! ```</span> <span class="doccomment">//!</span> <span class="doccomment">//! Taking a [`FnOnce`] as a parameter:</span> <span class="doccomment">//!</span> <span class="doccomment">//! ```rust</span> <span class="doccomment">//! fn consume_with_relish<F>(func: F)</span> <span class="doccomment">//! where F: FnOnce() -> String</span> <span class="doccomment">//! {</span> <span class="doccomment">//! // `func` consumes its captured variables, so it cannot be run more</span> <span class="doccomment">//! // than once</span> <span class="doccomment">//! println!("Consumed: {}", func());</span> <span class="doccomment">//!</span> <span class="doccomment">//! println!("Delicious!");</span> <span class="doccomment">//!</span> <span class="doccomment">//! // Attempting to invoke `func()` again will throw a `use of moved</span> <span class="doccomment">//! // value` error for `func`</span> <span class="doccomment">//! }</span> <span class="doccomment">//!</span> <span class="doccomment">//! let x = String::from("x");</span> <span class="doccomment">//! let consume_and_return_x = move || x;</span> <span class="doccomment">//! consume_with_relish(consume_and_return_x);</span> <span class="doccomment">//!</span> <span class="doccomment">//! // `consume_and_return_x` can no longer be invoked at this point</span> <span class="doccomment">//! ```</span> <span class="doccomment">//!</span> <span class="doccomment">//! [`Fn`]: trait.Fn.html</span> <span class="doccomment">//! [`FnMut`]: trait.FnMut.html</span> <span class="doccomment">//! [`FnOnce`]: trait.FnOnce.html</span> <span class="doccomment">//! [`Add`]: trait.Add.html</span> <span class="doccomment">//! [`Sub`]: trait.Sub.html</span> <span class="doccomment">//! [`Mul`]: trait.Mul.html</span> <span class="doccomment">//! [`clone`]: ../clone/trait.Clone.html#tymethod.clone</span> <span class="doccomment">//! [operator precedence]: ../../reference/expressions.html#expression-precedence</span> <span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">mod</span> <span class="ident">arith</span>; <span class="kw">mod</span> <span class="ident">bit</span>; <span class="kw">mod</span> <span class="ident">deref</span>; <span class="kw">mod</span> <span class="ident">drop</span>; <span class="kw">mod</span> <span class="ident">function</span>; <span class="kw">mod</span> <span class="ident">generator</span>; <span class="kw">mod</span> <span class="ident">index</span>; <span class="kw">mod</span> <span class="ident">range</span>; <span class="kw">mod</span> <span class="ident">try</span>; <span class="kw">mod</span> <span class="ident">unsize</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">arith</span>::{<span class="ident">Add</span>, <span class="ident">Sub</span>, <span class="ident">Mul</span>, <span class="ident">Div</span>, <span class="ident">Rem</span>, <span class="ident">Neg</span>}; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"op_assign_traits"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">arith</span>::{<span class="ident">AddAssign</span>, <span class="ident">SubAssign</span>, <span class="ident">MulAssign</span>, <span class="ident">DivAssign</span>, <span class="ident">RemAssign</span>}; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">bit</span>::{<span class="ident">Not</span>, <span class="ident">BitAnd</span>, <span class="ident">BitOr</span>, <span class="ident">BitXor</span>, <span class="ident">Shl</span>, <span class="ident">Shr</span>}; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"op_assign_traits"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">bit</span>::{<span class="ident">BitAndAssign</span>, <span class="ident">BitOrAssign</span>, <span class="ident">BitXorAssign</span>, <span class="ident">ShlAssign</span>, <span class="ident">ShrAssign</span>}; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">deref</span>::{<span class="ident">Deref</span>, <span class="ident">DerefMut</span>}; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">drop</span>::<span class="ident">Drop</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">function</span>::{<span class="ident">Fn</span>, <span class="ident">FnMut</span>, <span class="ident">FnOnce</span>}; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">index</span>::{<span class="ident">Index</span>, <span class="ident">IndexMut</span>}; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">range</span>::{<span class="ident">Range</span>, <span class="ident">RangeFrom</span>, <span class="ident">RangeFull</span>, <span class="ident">RangeTo</span>}; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"inclusive_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">range</span>::{<span class="ident">RangeInclusive</span>, <span class="ident">RangeToInclusive</span>, <span class="ident">RangeBounds</span>, <span class="ident">Bound</span>}; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_trait"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"42327"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">try</span>::<span class="ident">Try</span>; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"generator_trait"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"43122"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">generator</span>::{<span class="ident">Generator</span>, <span class="ident">GeneratorState</span>}; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"coerce_unsized"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27732"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">unsize</span>::<span class="ident">CoerceUnsized</span>; 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