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Trait std::ops::SubAssign ​

减法赋值运算符 -=。

rust
pub trait SubAssign<Rhs = Self> {
    // Required method
    fn sub_assign(&mut self, rhs: Rhs);
}

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。

rust
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});

Required Methods ​

sub_assign ​

执行 -= 操作。

rust
fn sub_assign(&mut self, rhs: Rhs)

参数：

  • rhs：执行 -= 操作的右值
rust
let mut x: u32 = 12;
x -= 1;
assert_eq!(x, 11);

​

Implementors ​

impl SubAssign<&f32> for f32 ​

impl SubAssign<&f64> for f64 ​

impl SubAssign<&i8> for i8 ​

impl SubAssign<&i8> for Saturating<i8> ​

impl SubAssign<&i8> for Wrapping<i8> ​

impl SubAssign<&i16> for i16 ​

impl SubAssign<&i16> for Saturating<i16> ​

impl SubAssign<&i16> for Wrapping<i16> ​

impl SubAssign<&i32> for i32 ​

impl SubAssign<&i32> for Saturating<i32> ​

impl SubAssign<&i32> for Wrapping<i32> ​

impl SubAssign<&i64> for i64 ​

impl SubAssign<&i64> for Saturating<i64> ​

impl SubAssign<&i64> for Wrapping<i64> ​

impl SubAssign<&i128> for i128 ​

impl SubAssign<&i128> for Saturating<i128> ​

impl SubAssign<&i128> for Wrapping<i128> ​

impl SubAssign<&isize> for isize ​

impl SubAssign<&isize> for Saturating<isize> ​

impl SubAssign<&isize> for Wrapping<isize> ​

impl SubAssign<&u8> for u8 ​

impl SubAssign<&u8> for Saturating<u8> ​

impl SubAssign<&u8> for Wrapping<u8> ​

impl SubAssign<&u16> for u16 ​

impl SubAssign<&u16> for Saturating<u16> ​

impl SubAssign<&u16> for Wrapping<u16> ​

impl SubAssign<&u32> for u32 ​

impl SubAssign<&u32> for Saturating<u32> ​

impl SubAssign<&u32> for Wrapping<u32> ​

impl SubAssign<&u64> for u64 ​

impl SubAssign<&u64> for Saturating<u64> ​

impl SubAssign<&u64> for Wrapping<u64> ​

impl SubAssign<&u128> for u128 ​

impl SubAssign<&u128> for Saturating<u128> ​

impl SubAssign<&u128> for Wrapping<u128> ​

impl SubAssign<&usize> for usize ​

impl SubAssign<&usize> for Saturating<usize> ​

impl SubAssign<&usize> for Wrapping<usize> ​

impl SubAssign<&Saturating<i8>> for Saturating<i8> ​

impl SubAssign<&Saturating<i16>> for Saturating<i16> ​

impl SubAssign<&Saturating<i32>> for Saturating<i32> ​

impl SubAssign<&Saturating<i64>> for Saturating<i64> ​

impl SubAssign<&Saturating<i128>> for Saturating<i128> ​

impl SubAssign<&Saturating<isize>> for Saturating<isize> ​

impl SubAssign<&Saturating<u8>> for Saturating<u8> ​

impl SubAssign<&Saturating<u16>> for Saturating<u16> ​

impl SubAssign<&Saturating<u32>> for Saturating<u32> ​

impl SubAssign<&Saturating<u64>> for Saturating<u64> ​

impl SubAssign<&Saturating<u128>> for Saturating<u128> ​

impl SubAssign<&Saturating<usize>> for Saturating<usize> ​

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<&Wrapping<isize>> for Wrapping<isize> ​

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<usize>> for Wrapping<usize> ​

impl SubAssign<f32> for f32 ​

impl SubAssign<f64> for f64 ​

impl SubAssign<i8> for i8 ​

impl SubAssign<i8> for Saturating<i8> ​

impl SubAssign<i8> for Wrapping<i8> ​

impl SubAssign<i16> for i16 ​

impl SubAssign<i16> for Saturating<i16> ​

impl SubAssign<i16> for Wrapping<i16> ​

impl SubAssign<i32> for i32 ​

impl SubAssign<i32> for Saturating<i32> ​

impl SubAssign<i32> for Wrapping<i32> ​

impl SubAssign<i64> for i64 ​

impl SubAssign<i64> for Saturating<i64> ​

impl SubAssign<i64> for Wrapping<i64> ​

impl SubAssign<i128> for i128 ​

impl SubAssign<i128> for Saturating<i128> ​

impl SubAssign<i128> for Wrapping<i128> ​

impl SubAssign<isize> for isize ​

impl SubAssign<isize> for Saturating<isize> ​

impl SubAssign<isize> for Wrapping<isize> ​

impl SubAssign<u8> for u8 ​

impl SubAssign<u8> for Saturating<u8> ​

impl SubAssign<u8> for Wrapping<u8> ​

impl SubAssign<u16> for u16 ​

impl SubAssign<u16> for Saturating<u16> ​

impl SubAssign<u16> for Wrapping<u16> ​

impl SubAssign<u32> for u32 ​

impl SubAssign<u32> for Saturating<u32> ​

impl SubAssign<u32> for Wrapping<u32> ​

impl SubAssign<u64> for u64 ​

impl SubAssign<u64> for Saturating<u64> ​

impl SubAssign<u64> for Wrapping<u64> ​

impl SubAssign<u128> for u128 ​

impl SubAssign<u128> for Saturating<u128> ​

impl SubAssign<u128> for Wrapping<u128> ​

impl SubAssign<usize> for usize ​

impl SubAssign<usize> for Saturating<usize> ​

impl SubAssign<usize> for Wrapping<usize> ​

impl SubAssign<Saturating<i8>> for Saturating<i8> ​

impl SubAssign<Saturating<i16>> for Saturating<i16> ​

impl SubAssign<Saturating<i32>> for Saturating<i32> ​

impl SubAssign<Saturating<i64>> for Saturating<i64> ​

impl SubAssign<Saturating<i128>> for Saturating<i128> ​

impl SubAssign<Saturating<isize>> for Saturating<isize> ​

impl SubAssign<Saturating<u8>> for Saturating<u8> ​

impl SubAssign<Saturating<u16>> for Saturating<u16> ​

impl SubAssign<Saturating<u32>> for Saturating<u32> ​

impl SubAssign<Saturating<u64>> for Saturating<u64> ​

impl SubAssign<Saturating<u128>> for Saturating<u128> ​

impl SubAssign<Saturating<usize>> for Saturating<usize> ​

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<Wrapping<isize>> for Wrapping<isize> ​

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<usize>> for Wrapping<usize> ​

impl SubAssign<Duration> for Duration ​

impl SubAssign<Duration> for Instant ​

impl SubAssign<Duration> for SystemTime ​

impl<T, U, const LANES: usize> SubAssign<U> for Simd<T, LANES> ​

rust
impl<T, U, const LANES: usize> SubAssign<U> for Simd<T, LANES>
where
  Simd<T, LANES>: Sub<U, Output = Simd<T, LANES>>,
  T: SimdElement,
  LaneCount<LANES>: SupportedLaneCount,

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