std::ops::SubAssign

Trait std::ops::SubAssign

#[lang = "sub_assign"]
pub trait SubAssign<Rhs = Self> {
    fn sub_assign(&mut self, rhs: Rhs);
}

The subtraction assignment operator -=.

Examples

This example creates a Point struct that implements the SubAssign trait, and then demonstrates sub-assigning to a mutable Point.

use std::ops::SubAssign;

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

impl SubAssign for Point {
    fn sub_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: 3, y: 3 };
point -= Point { x: 2, y: 3 };
assert_eq!(point, Point {x: 1, y: 0});

Required Methods

Implementors

• impl SubAssign<Wrapping<usize>> for Wrapping<usize>
• impl SubAssign<Wrapping<u8>> for Wrapping<u8>
• impl SubAssign<Wrapping<u16>> for Wrapping<u16>
• impl SubAssign<Wrapping<u32>> for Wrapping<u32>
• impl SubAssign<Wrapping<u64>> for Wrapping<u64>
• impl SubAssign<Wrapping<u128>> for Wrapping<u128>
• impl SubAssign<Wrapping<isize>> for Wrapping<isize>
• impl SubAssign<Wrapping<i8>> for Wrapping<i8>
• impl SubAssign<Wrapping<i16>> for Wrapping<i16>
• impl SubAssign<Wrapping<i32>> for Wrapping<i32>
• impl SubAssign<Wrapping<i64>> for Wrapping<i64>
• impl SubAssign<Wrapping<i128>> for Wrapping<i128>
• impl SubAssign<usize> for usize
• impl SubAssign<u8> for u8
• impl SubAssign<u16> for u16
• impl SubAssign<u32> for u32
• impl SubAssign<u64> for u64
• impl SubAssign<u128> for u128
• impl SubAssign<isize> for isize
• impl SubAssign<i8> for i8
• impl SubAssign<i16> for i16
• impl SubAssign<i32> for i32
• impl SubAssign<i64> for i64
• impl SubAssign<i128> for i128
• impl SubAssign<f32> for f32
• impl SubAssign<f64> for f64
• impl SubAssign for Duration
• impl SubAssign<Duration> for Instant
• impl SubAssign<Duration> for SystemTime