std/subtract

Import with import std/subtract.

Exports

Interfaces

• Subtract

interface Subtract

interface Subtract<'Rhs, 'Out> {
    fn subtract(lhs: self, rhs: 'Rhs): 'Out
}

Protocol for the - operator.

Subtract.subtract(lhs, rhs) returns the result of lhs - rhs. The left-hand type is the implementor (self); the interface type parameters describe the right-hand operand and the output type. That lets an impl choose a result that is not necessarily the same type as the left-hand operand.

pub type DateDay Int
pub type Days Int

impl Subtract<Days, DateDay> for DateDay {
  fn subtract(lhs: DateDay, rhs: Days): DateDay { ... }
}