Either

A interface to represent a two possible value.

interface Either (

TLeft

TRight

) {

}

Members

left TLeft left(): Return TLeft value if this is the Left!(TLeft, TRight) instance, otherwise throw Exception.
right TRight right(): Return TRight value if this is the Right!(TLeft, TRight) instance, otherwise throw Exception.
tryLeft Maybe!TLeft tryLeft(): Return Just!TLeft value if this is the Left!(TLeft, TRight) instance, otherwise Nothing!TLeft value.
tryRight Maybe!TRight tryRight(): Return Just!TRight value if this is the Right!(TLeft, TRight) instance, otherwise Nothing!TRight value.

isLeft bool isLeft [@property getter]: Return true if this is the Left!(TLeft, TRight) instance, otherwise false.
isRight bool isRight [@property getter]: Return true if this is the Right!(TLeft, TRight) instance, otherwise false.

left Either!(TLeft, TRight) left(TLeft value): A factory method to create Left(TLeft, TRight) instance.
right Either!(TLeft, TRight) right(TRight value): A factory method to create Right(TLeft, TRight) instance.

1 auto either = Either!(string, int).right(33-4);
2 if (either.isRight)
3 {
4    writeln(either.right());
5 }

Output: