Trait core::ops::Sub 1.0.0[−][src]
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
Subtractable 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 });Run
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 });Run
Associated Types
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