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Trait std::ops::Sub ​

减法运算符 -。

请注意，默认情况下 Rhs 是 Self，但这不是强制性的。 例如，std::time::SystemTime 实现 Sub<Duration>，它允许以 SystemTime = SystemTime - Duration 形式进行操作。

rust
pub trait Sub<Rhs = Self> {
    type Output;

    // Required method
    fn sub(self, rhs: Rhs) -> Self::Output;
}

points类型的相减

rust
use std::ops::Sub;

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

impl Sub for Point {
    type Output = Self;

    fn sub(self, other: Self) -> Self::Output {
        Self {
            x: self.x - other.x,
            y: self.y - other.y,
        }
    }
}

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

使用泛型实现 Sub

rust
use std::ops::Sub;

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

// 请注意，该实现使用关联类型 `Output`。
impl<T: Sub<Output = T>> Sub for Point<T> {
    type Output = Self;

    fn sub(self, other: Self) -> Self::Output {
        Point {
            x: self.x - other.x,
            y: self.y - other.y,
        }
    }
}

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

Required Associated Types ​

Output ​

应用 - 运算符后的结果类型。

rust
type Output

Required Methods ​

sub ​

rust
fn sub(self, rhs: Rhs) -> Self::Output

参数：

  • rhs：执行 - 操作的右值

返回值：返回相减后的值

rust
ssert_eq!(12 - 1, 11);

​

Implementors ​

impl Sub<&f32> for &f32 ​

impl Sub<&f32> for f32 ​

impl Sub<&f64> for &f64 ​

impl Sub<&f64> for f64 ​

impl Sub<&i8> for &i8 ​

impl Sub<&i8> for i8 ​

impl Sub<&i16> for &i16 ​

impl Sub<&i16> for i16 ​

impl Sub<&i32> for &i32 ​

impl Sub<&i32> for i32 ​

impl Sub<&i64> for &i64 ​

impl Sub<&i64> for i64 ​

impl Sub<&i128> for &i128 ​

impl Sub<&i128> for i128 ​

impl Sub<&isize> for &isize ​

impl Sub<&isize> for isize ​

impl Sub<&u8> for &u8 ​

impl Sub<&u8> for u8 ​

impl Sub<&u16> for &u16 ​

impl Sub<&u16> for u16 ​

impl Sub<&u32> for &u32 ​

impl Sub<&u32> for u32 ​

impl Sub<&u64> for &u64 ​

impl Sub<&u64> for u64 ​

impl Sub<&u128> for &u128 ​

impl Sub<&u128> for u128 ​

impl Sub<&usize> for &usize ​

impl Sub<&usize> for usize ​

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

impl Sub<f32> for f32 ​

impl Sub<f64> for f64 ​

impl Sub<i8> for i8 ​

impl Sub<i16> for i16 ​

impl Sub<i32> for i32 ​

impl Sub<i64> for i64 ​

impl Sub<i128> for i128 ​

impl Sub<isize> for isize ​

impl Sub<u8> for u8 ​

impl Sub<u16> for u16 ​

impl Sub<u32> for u32 ​

impl Sub<u64> for u64 ​

impl Sub<u128> for u128 ​

impl Sub<usize> for usize ​

impl Sub<Assume> for Assume ​

impl Sub<Saturating<i8>> for Saturating<i8> ​

impl Sub<Saturating<i16>> for Saturating<i16> ​

impl Sub<Saturating<i32>> for Saturating<i32> ​

impl Sub<Saturating<i64>> for Saturating<i64> ​

impl Sub<Saturating<i128>> for Saturating<i128> ​

impl Sub<Saturating<isize>> for Saturating<isize> ​

impl Sub<Saturating<u8>> for Saturating<u8> ​

impl Sub<Saturating<u16>> for Saturating<u16> ​

impl Sub<Saturating<u32>> for Saturating<u32> ​

impl Sub<Saturating<u64>> for Saturating<u64> ​

impl Sub<Saturating<u128>> for Saturating<u128> ​

impl Sub<Saturating<usize>> for Saturating<usize> ​

impl Sub<Wrapping<i8>> for Wrapping<i8> ​

impl Sub<Wrapping<i16>> for Wrapping<i16> ​

impl Sub<Wrapping<i32>> for Wrapping<i32> ​

impl Sub<Wrapping<i64>> for Wrapping<i64> ​

impl Sub<Wrapping<i128>> for Wrapping<i128> ​

impl Sub<Wrapping<isize>> for Wrapping<isize> ​

impl Sub<Wrapping<u8>> for Wrapping<u8> ​

impl Sub<Wrapping<u16>> for Wrapping<u16> ​

impl Sub<Wrapping<u32>> for Wrapping<u32> ​

impl Sub<Wrapping<u64>> for Wrapping<u64> ​

impl Sub<Wrapping<u128>> for Wrapping<u128> ​

impl Sub<Wrapping<usize>> for Wrapping<usize> ​

impl Sub<Duration> for Duration ​

impl Sub<Duration> for Instant ​

impl Sub<Duration> for SystemTime ​

impl Sub<Instant> for Instant ​

impl<'a> Sub<f32> for &'a f32 ​

impl<'a> Sub<f64> for &'a f64 ​

impl<'a> Sub<i8> for &'a i8 ​

impl<'a> Sub<i16> for &'a i16 ​

impl<'a> Sub<i32> for &'a i32 ​

impl<'a> Sub<i64> for &'a i64 ​

impl<'a> Sub<i128> for &'a i128 ​

impl<'a> Sub<isize> for &'a isize ​

impl<'a> Sub<u8> for &'a u8 ​

impl<'a> Sub<u16> for &'a u16 ​

impl<'a> Sub<u32> for &'a u32 ​

impl<'a> Sub<u64> for &'a u64 ​

impl<'a> Sub<u128> for &'a u128 ​

impl<'a> Sub<usize> for &'a usize ​

impl<'a> Sub<Saturating<i8>> for &'a Saturating<i8> ​

impl<'a> Sub<Saturating<i16>> for &'a Saturating<i16> ​

impl<'a> Sub<Saturating<i32>> for &'a Saturating<i32> ​

impl<'a> Sub<Saturating<i64>> for &'a Saturating<i64> ​

impl<'a> Sub<Saturating<i128>> for &'a Saturating<i128> ​

impl<'a> Sub<Saturating<isize>> for &'a Saturating<isize> ​

impl<'a> Sub<Saturating<u8>> for &'a Saturating<u8> ​

impl<'a> Sub<Saturating<u16>> for &'a Saturating<u16> ​

impl<'a> Sub<Saturating<u32>> for &'a Saturating<u32> ​

impl<'a> Sub<Saturating<u64>> for &'a Saturating<u64> ​

impl<'a> Sub<Saturating<u128>> for &'a Saturating<u128> ​

impl<'a> Sub<Saturating<usize>> for &'a Saturating<usize> ​

impl<'a> Sub<Wrapping<i8>> for &'a Wrapping<i8> ​

impl<'a> Sub<Wrapping<i16>> for &'a Wrapping<i16> ​

impl<'a> Sub<Wrapping<i32>> for &'a Wrapping<i32> ​

impl<'a> Sub<Wrapping<i64>> for &'a Wrapping<i64> ​

impl<'a> Sub<Wrapping<i128>> for &'a Wrapping<i128> ​

impl<'a> Sub<Wrapping<isize>> for &'a Wrapping<isize> ​

impl<'a> Sub<Wrapping<u8>> for &'a Wrapping<u8> ​

impl<'a> Sub<Wrapping<u16>> for &'a Wrapping<u16> ​

impl<'a> Sub<Wrapping<u32>> for &'a Wrapping<u32> ​

impl<'a> Sub<Wrapping<u64>> for &'a Wrapping<u64> ​

impl<'a> Sub<Wrapping<u128>> for &'a Wrapping<u128> ​

impl<'a> Sub<Wrapping<usize>> for &'a Wrapping<usize> ​

impl<'lhs, 'rhs, T, const LANES: usize> Sub<&'rhs Simd<T, LANES>> for &'lhs Simd<T, LANES> ​

rust
impl<'lhs, 'rhs, T, const LANES: usize> Sub<&'rhs Simd<T, LANES>> for &'lhs Simd<T, LANES>
where
  T: SimdElement,
  Simd<T, LANES>: Sub<Simd<T, LANES>, Output = Simd<T, LANES>>,
  LaneCount<LANES>: SupportedLaneCount,

impl<T, A> Sub<&BTreeSet<T, A>> for &BTreeSet<T, A> ​

rust
impl<T, A> Sub<&BTreeSet<T, A>> for &BTreeSet<T, A>
where
  T: Ord + Clone,
  A: Allocator + Clone,

impl<T, S> Sub<&HashSet<T, S>> for &HashSet<T, S> ​

rust
impl<T, S> Sub<&HashSet<T, S>> for &HashSet<T, S>
where
  T: Eq + Hash + Clone,
  S: BuildHasher + Default,

impl<T, const LANES: usize> Sub<&Simd<T, LANES>> for Simd<T, LANES> ​

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

impl<T, const LANES: usize> Sub<Simd<T, LANES>> for &Simd<T, LANES> ​

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

impl<const N: usize> Sub<Simd<f32, N>> for Simd<f32, N> ​

rust
impl<const N: usize> Sub<Simd<f32, N>> for Simd<f32, N>
where
  f32: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<f64, N>> for Simd<f64, N> ​

rust
impl<const N: usize> Sub<Simd<f64, N>> for Simd<f64, N>
where
  f64: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<i8, N>> for Simd<i8, N> ​

rust
impl<const N: usize> Sub<Simd<i8, N>> for Simd<i8, N>
where
  i8: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<i16, N>> for Simd<i16, N> ​

rust
impl<const N: usize> Sub<Simd<i16, N>> for Simd<i16, N>
where
  i16: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<i32, N>> for Simd<i32, N> ​

rust
impl<const N: usize> Sub<Simd<i32, N>> for Simd<i32, N>
where
  i32: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<i64, N>> for Simd<i64, N> ​

rust
impl<const N: usize> Sub<Simd<i64, N>> for Simd<i64, N>
where
  i64: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<isize, N>> for Simd<isize, N> ​

rust
impl<const N: usize> Sub<Simd<isize, N>> for Simd<isize, N>
where
  isize: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<u8, N>> for Simd<u8, N> ​

rust
impl<const N: usize> Sub<Simd<u8, N>> for Simd<u8, N>
where
  u8: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<u16, N>> for Simd<u16, N> ​

rust
impl<const N: usize> Sub<Simd<u16, N>> for Simd<u16, N>
where
  u16: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<u32, N>> for Simd<u32, N> ​

rust
impl<const N: usize> Sub<Simd<u32, N>> for Simd<u32, N>
where
  u32: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<u64, N>> for Simd<u64, N> ​

rust
impl<const N: usize> Sub<Simd<u64, N>> for Simd<u64, N>
where
  u64: SimdElement,
  LaneCount<N>: SupportedLaneCount,

impl<const N: usize> Sub<Simd<usize, N>> for Simd<usize, N> ​

rust
impl<const N: usize> Sub<Simd<usize, N>> for Simd<usize, N>
where
  usize: SimdElement,
  LaneCount<N>: SupportedLaneCount,

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