Trait Sub

1.0.0 · Source

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

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

Expand description

core The subtraction operator -.

Re-exported from core::ops:: .

The subtraction operator -.

Note that Rhs is Self by default, but this is not mandatory. For example, std::time::SystemTime implements Sub<Duration>, which permits operations of the form SystemTime = SystemTime - Duration.

§Examples

§`Sub`tractable points

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 });

§Implementing `Sub` with generics

Here is an example of the same Point struct implementing the Sub trait using generics.

use std::ops::Sub;

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

// Notice that the implementation uses the associated type `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 });

To configure the largest unit or enable rounding, use Date::since.

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type Output = Span

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impl Sub for DateTime

Computes the span of time between two datetimes.

This will return a negative span when the datetime being subtracted is greater.

Since this uses the default configuration for calculating a span between two datetimes (no rounding and largest units is days), this will never panic or fail in any way.

To configure the largest unit or enable rounding, use DateTime::since.

If you need a SignedDuration representing the span between two civil datetimes, then use DateTime::duration_since.

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type Output = Span

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impl Sub for Time

Computes the span of time between two times.

This will return a negative span when the time being subtracted is greater.

Since this uses the default configuration for calculating a span between two times (no rounding and largest units is hours), this will never panic or fail in any way.

To configure the largest unit or enable rounding, use Time::since.

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type Output = Span

impl Sub<f32> for Float<f32>

impl Sub<i64> for Int<i64>

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type Output = Int<i128>

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impl Sub<isize> for Int<isize>

Available on crate feature _int_isize only.

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type Output = Int<u128>

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impl Sub<usize> for Int<usize>

Available on crate feature _int_usize only.

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impl<'a> Sub for &'a Zoned

Computes the span of time between two zoned datetimes.

This will return a negative span when the zoned datetime being subtracted is greater.

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type Output = Result<VecVector<T>, NumError>

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impl<T: Clone + Sub<Output = T>, const D: usize> Sub for Vector<T, D>

Available on crate feature alg only.

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Trait SubCopy item path

§Examples

§Subtractable points

§Implementing Sub with generics

Required Associated Types§

type Output

Required Methods§

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

§Example

Implementors§

impl Sub for &JsValue

type Output = JsValue

impl Sub for f16

type Output = f16

impl Sub for f32

type Output = f32

impl Sub for f64

type Output = f64

impl Sub for f128

type Output = f128

impl Sub for i8

type Output = i8

impl Sub for i16

type Output = i16

impl Sub for i32

type Output = i32

impl Sub for i64

type Output = i64

impl Sub for i128

type Output = i128

impl Sub for isize

type Output = isize

impl Sub for u8

type Output = u8

impl Sub for u16

type Output = u16

impl Sub for u32

type Output = u32

impl Sub for u64

type Output = u64

impl Sub for u128

type Output = u128

impl Sub for usize

type Output = usize

impl Sub for Assume

type Output = Assume

impl Sub for KeyEventState

type Output = KeyEventState

impl Sub for KeyModifiers

type Output = KeyModifiers

impl Sub for KeyboardEnhancementFlags

type Output = KeyboardEnhancementFlags

impl Sub for Date

type Output = Span

impl Sub for DateTime

type Output = Span

impl Sub for Time

type Output = Span

impl Sub for SignedDuration

type Output = SignedDuration

impl Sub for Timestamp

type Output = Span

impl Sub for Offset

type Output = Span

impl Sub for BigInt

type Output = <&'static BigInt as Sub>::Output

impl Sub for Number

type Output = <&'static Number as Sub>::Output

impl Sub for Decibels

type Output = Decibels

impl Sub for Frame

type Output = Frame

impl Sub for Mix

type Output = Mix

impl Sub for Panning

type Output = Panning

impl Sub for PlaybackRate

type Output = PlaybackRate

impl Sub for Semitones

type Output = Semitones

Trait Sub

§`Sub`tractable points

§Implementing `Sub` with generics