std::ops::AddAssign - Rust
Description: API documentation for the Rust `AddAssign` trait in crate `std`.
Keywords: rust, rustlang, rust-lang, AddAssign

# Trait std::ops::AddAssign 1.8.0 [−] [src]

    pub trait AddAssign<Rhs = Self> {
        fn add_assign(&mut self, Rhs);
    }

The `AddAssign` trait is used to specify the functionality of `+=`.

# Examples

This example creates a `Point` struct that implements the `AddAssign` trait, and then demonstrates add-assigning to a mutable `Point`.

    use std::ops::AddAssign;

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

    impl AddAssign for Point {
        fn add_assign(&mut self, other: Point) {
            *self = Point {
                x: self.x + other.x,
                y: self.y + other.y,
            };
        }
    }

    impl PartialEq for Point {
        fn eq(&self, other: &Self) -> bool {
            self.x == other.x && self.y == other.y
        }
    }

    let mut point = Point { x: 1, y: 0 };
    point += Point { x: 2, y: 3 };
    assert_eq!(point, Point { x: 3, y: 3 });Run

## Required Methods

### `fn add_assign(&mut self, Rhs)`

The method for the `+=` operator

## Implementors

- `impl<'a> AddAssign<&'a str> for std::borrow::Cow<'a, str>`
- `impl<'a> AddAssign<Cow<'a, str>> for std::borrow::Cow<'a, str>`
- `impl<'a> AddAssign<&'a str> for String`
- `impl AddAssign<Wrapping<usize>> for std::num::Wrapping<usize>`
- `impl AddAssign<Wrapping<u8>> for std::num::Wrapping<u8>`
- `impl AddAssign<Wrapping<u16>> for std::num::Wrapping<u16>`
- `impl AddAssign<Wrapping<u32>> for std::num::Wrapping<u32>`
- `impl AddAssign<Wrapping<u64>> for std::num::Wrapping<u64>`
- `impl AddAssign<Wrapping<isize>> for std::num::Wrapping<isize>`
- `impl AddAssign<Wrapping<i8>> for std::num::Wrapping<i8>`
- `impl AddAssign<Wrapping<i16>> for std::num::Wrapping<i16>`
- `impl AddAssign<Wrapping<i32>> for std::num::Wrapping<i32>`
- `impl AddAssign<Wrapping<i64>> for std::num::Wrapping<i64>`
- `impl AddAssign<Wrapping<u128>> for std::num::Wrapping<u128>`
- `impl AddAssign<Wrapping<i128>> for std::num::Wrapping<i128>`
- `impl AddAssign<usize> for usize`
- `impl AddAssign<u8> for u8`
- `impl AddAssign<u16> for u16`
- `impl AddAssign<u32> for u32`
- `impl AddAssign<u64> for u64`
- `impl AddAssign<isize> for isize`
- `impl AddAssign<i8> for i8`
- `impl AddAssign<i16> for i16`
- `impl AddAssign<i32> for i32`
- `impl AddAssign<i64> for i64`
- `impl AddAssign<f32> for f32`
- `impl AddAssign<f64> for f64`
- `impl AddAssign<u128> for u128`
- `impl AddAssign<i128> for i128`
- `impl AddAssign for Duration`
- `impl AddAssign<Duration> for Instant`
- `impl AddAssign<Duration> for SystemTime`

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