Trait std::ops::SubAssign 1.8.0[−][src]
pub trait SubAssign<Rhs = Self> { fn sub_assign(&mut self, rhs: Rhs); }
Expand description
减法赋值运算符 -=
。
Examples
本示例创建一个实现 SubAssign
trait 的 Point
结构体,然后演示对可变 Point
的子分配。
use std::ops::SubAssign; #[derive(Debug, Copy, Clone, PartialEq)] struct Point { x: i32, y: i32, } impl SubAssign for Point { fn sub_assign(&mut self, other: Self) { *self = Self { x: self.x - other.x, y: 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});Run