Trait std::ops::Add

#[lang = "add"]
pub trait Add<RHS = Self> {
    type Output;
    fn add(self, rhs: RHS) -> Self::Output;

The addition operator +.

Note that RHS is Self by default, but this is not mandatory. For example, std::time::SystemTime implements Add<Duration>, which permits operations of the form SystemTime = SystemTime + Duration.


Addable points

use std::ops::Add;

#[derive(Debug, PartialEq)]
struct Point {
    x: i32,
    y: i32,

impl Add for Point {
    type Output = Point;

    fn add(self, other: Point) -> Point {
        Point {
            x: self.x + other.x,
            y: self.y + other.y,

assert_eq!(Point { x: 1, y: 0 } + Point { x: 2, y: 3 },
           Point { x: 3, y: 3 });

Implementing Add with generics

Here is an example of the same Point struct implementing the Add trait using generics.

use std::ops::Add;

#[derive(Debug, PartialEq)]
struct Point<T> {
    x: T,
    y: T,

// Notice that the implementation uses the associated type `Output`.
impl<T: Add<Output=T>> Add for Point<T> {
    type Output = Point<T>;

    fn add(self, other: Point<T>) -> Point<T> {
        Point {
            x: self.x + other.x,
            y: self.y + other.y,

assert_eq!(Point { x: 1, y: 0 } + Point { x: 2, y: 3 },
           Point { x: 3, y: 3 });

Associated Types

The resulting type after applying the + operator.

Required Methods

Performs the + operation.


impl Add<f32> for f32 [src]

impl Add<f64> for f64 [src]

impl Add<i128> for i128 [src]

impl Add<i16> for i16 [src]

impl Add<i32> for i32 [src]

impl Add<i64> for i64 [src]

impl Add<i8> for i8 [src]

impl Add<isize> for isize [src]

impl Add<u128> for u128 [src]

impl Add<u16> for u16 [src]

impl Add<u32> for u32 [src]

impl Add<u64> for u64 [src]

impl Add<u8> for u8 [src]

impl Add<usize> for usize [src]

impl Add<Wrapping<i128>> for Wrapping<i128> [src]

impl Add<Wrapping<i16>> for Wrapping<i16> [src]

impl Add<Wrapping<i32>> for Wrapping<i32> [src]

impl Add<Wrapping<i64>> for Wrapping<i64> [src]

impl Add<Wrapping<i8>> for Wrapping<i8> [src]

impl Add<Wrapping<isize>> for Wrapping<isize> [src]

impl Add<Wrapping<u128>> for Wrapping<u128> [src]

impl Add<Wrapping<u16>> for Wrapping<u16> [src]

impl Add<Wrapping<u32>> for Wrapping<u32> [src]

impl Add<Wrapping<u64>> for Wrapping<u64> [src]

impl Add<Wrapping<u8>> for Wrapping<u8> [src]

impl Add<Wrapping<usize>> for Wrapping<usize> [src]

impl Add<Duration> for Duration [src]

impl Add<Duration> for Instant [src]

impl Add<Duration> for SystemTime [src]

impl<'a> Add<&'a f32> for f32 [src]

impl<'a> Add<&'a f64> for f64 [src]

impl<'a> Add<&'a i128> for i128 [src]

impl<'a> Add<&'a i16> for i16 [src]

impl<'a> Add<&'a i32> for i32 [src]

impl<'a> Add<&'a i64> for i64 [src]

impl<'a> Add<&'a i8> for i8 [src]

impl<'a> Add<&'a isize> for isize [src]

impl<'a> Add<&'a str> for Cow<'a, str> [src]

impl<'a> Add<&'a str> for String [src]

Implements the + operator for concatenating two strings.

This consumes the String on the left-hand side and re-uses its buffer (growing it if necessary). This is done to avoid allocating a new String and copying the entire contents on every operation, which would lead to O(n^2) running time when building an n-byte string by repeated concatenation.

The string on the right-hand side is only borrowed; its contents are copied into the returned String.


Concatenating two Strings takes the first by value and borrows the second:

let a = String::from("hello");
let b = String::from(" world");
let c = a + &b;
// `a` is moved and can no longer be used here.

If you want to keep using the first String, you can clone it and append to the clone instead:

let a = String::from("hello");
let b = String::from(" world");
let c = a.clone() + &b;
// `a` is still valid here.

Concatenating &str slices can be done by converting the first to a String:

let a = "hello";
let b = " world";
let c = a.to_string() + b;

impl<'a> Add<&'a u128> for u128 [src]

impl<'a> Add<&'a u16> for u16 [src]

impl<'a> Add<&'a u32> for u32 [src]

impl<'a> Add<&'a u64> for u64 [src]

impl<'a> Add<&'a u8> for u8 [src]

impl<'a> Add<&'a usize> for usize [src]

impl<'a> Add<&'a Wrapping<i128>> for Wrapping<i128> [src]

impl<'a> Add<&'a Wrapping<i16>> for Wrapping<i16> [src]

impl<'a> Add<&'a Wrapping<i32>> for Wrapping<i32> [src]

impl<'a> Add<&'a Wrapping<i64>> for Wrapping<i64> [src]

impl<'a> Add<&'a Wrapping<i8>> for Wrapping<i8> [src]

impl<'a> Add<&'a Wrapping<isize>> for Wrapping<isize> [src]

impl<'a> Add<&'a Wrapping<u128>> for Wrapping<u128> [src]

impl<'a> Add<&'a Wrapping<u16>> for Wrapping<u16> [src]

impl<'a> Add<&'a Wrapping<u32>> for Wrapping<u32> [src]

impl<'a> Add<&'a Wrapping<u64>> for Wrapping<u64> [src]

impl<'a> Add<&'a Wrapping<u8>> for Wrapping<u8> [src]

impl<'a> Add<&'a Wrapping<usize>> for Wrapping<usize> [src]

impl<'a> Add<Cow<'a, str>> for Cow<'a, str> [src]

impl<'a> Add<f32> for &'a f32 [src]

impl<'a> Add<f64> for &'a f64 [src]

impl<'a> Add<i128> for &'a i128 [src]

impl<'a> Add<i16> for &'a i16 [src]

impl<'a> Add<i32> for &'a i32 [src]

impl<'a> Add<i64> for &'a i64 [src]

impl<'a> Add<i8> for &'a i8 [src]

impl<'a> Add<isize> for &'a isize [src]

impl<'a> Add<u128> for &'a u128 [src]

impl<'a> Add<u16> for &'a u16 [src]

impl<'a> Add<u32> for &'a u32 [src]

impl<'a> Add<u64> for &'a u64 [src]

impl<'a> Add<u8> for &'a u8 [src]

impl<'a> Add<usize> for &'a usize [src]

impl<'a> Add<Wrapping<i128>> for &'a Wrapping<i128> [src]

impl<'a> Add<Wrapping<i16>> for &'a Wrapping<i16> [src]

impl<'a> Add<Wrapping<i32>> for &'a Wrapping<i32> [src]

impl<'a> Add<Wrapping<i64>> for &'a Wrapping<i64> [src]

impl<'a> Add<Wrapping<i8>> for &'a Wrapping<i8> [src]

impl<'a> Add<Wrapping<isize>> for &'a Wrapping<isize> [src]

impl<'a> Add<Wrapping<u128>> for &'a Wrapping<u128> [src]

impl<'a> Add<Wrapping<u16>> for &'a Wrapping<u16> [src]

impl<'a> Add<Wrapping<u32>> for &'a Wrapping<u32> [src]

impl<'a> Add<Wrapping<u64>> for &'a Wrapping<u64> [src]

impl<'a> Add<Wrapping<u8>> for &'a Wrapping<u8> [src]

impl<'a> Add<Wrapping<usize>> for &'a Wrapping<usize> [src]

impl<'a, 'b> Add<&'a f32> for &'b f32 [src]

impl<'a, 'b> Add<&'a f64> for &'b f64 [src]

impl<'a, 'b> Add<&'a i128> for &'b i128 [src]

impl<'a, 'b> Add<&'a i16> for &'b i16 [src]

impl<'a, 'b> Add<&'a i32> for &'b i32 [src]

impl<'a, 'b> Add<&'a i64> for &'b i64 [src]

impl<'a, 'b> Add<&'a i8> for &'b i8 [src]

impl<'a, 'b> Add<&'a isize> for &'b isize [src]

impl<'a, 'b> Add<&'a u128> for &'b u128 [src]

impl<'a, 'b> Add<&'a u16> for &'b u16 [src]

impl<'a, 'b> Add<&'a u32> for &'b u32 [src]

impl<'a, 'b> Add<&'a u64> for &'b u64 [src]

impl<'a, 'b> Add<&'a u8> for &'b u8 [src]

impl<'a, 'b> Add<&'a usize> for &'b usize [src]

impl<'a, 'b> Add<&'a Wrapping<i128>> for &'b Wrapping<i128> [src]

impl<'a, 'b> Add<&'a Wrapping<i16>> for &'b Wrapping<i16> [src]

impl<'a, 'b> Add<&'a Wrapping<i32>> for &'b Wrapping<i32> [src]

impl<'a, 'b> Add<&'a Wrapping<i64>> for &'b Wrapping<i64> [src]

impl<'a, 'b> Add<&'a Wrapping<i8>> for &'b Wrapping<i8> [src]

impl<'a, 'b> Add<&'a Wrapping<isize>> for &'b Wrapping<isize> [src]

impl<'a, 'b> Add<&'a Wrapping<u128>> for &'b Wrapping<u128> [src]

impl<'a, 'b> Add<&'a Wrapping<u16>> for &'b Wrapping<u16> [src]

impl<'a, 'b> Add<&'a Wrapping<u32>> for &'b Wrapping<u32> [src]

impl<'a, 'b> Add<&'a Wrapping<u64>> for &'b Wrapping<u64> [src]

impl<'a, 'b> Add<&'a Wrapping<u8>> for &'b Wrapping<u8> [src]

impl<'a, 'b> Add<&'a Wrapping<usize>> for &'b Wrapping<usize> [src]

© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.