> /// The quotient of `self` dividing by `rhs`.
> // Arithmetic provides a default implementation of this method in terms
> // of the mutating `divide` operation.
> @warn_unused_result
> func divided(by rhs: Self) -> Self
>
> /// Divides `self` by `rhs`.
> mutating func divide(by rhs: Self)
When dealing with integer arithmetic, I often find useful a `divmod` function
which produces a (quotient, remainder) pair.
It could be argued that such a pair is the primary result of division on
integers. It would be great to have such a function included in the design.
> /// SignedArithmetic protocol will only be conformed to by signed numbers,
> /// otherwise it would be possible to negate an unsigned value.
> ///
> /// The only method of this protocol has the default implementation in an
> /// extension, that uses a parameterless initializer and subtraction.
> public protocol SignedArithmetic : Arithmetic {
> func negate() -> Self
> }
It might make sense to also have a
public protocol InvertibleArithmetic : Arithmetic {
func inverted() -> Self
}
FloatingPoint would conform to this protocol, returning 1/x, while integer
types would not.
--
Nicola
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