Maybe

A interface to represent an optional value.

interface Maybe (

) {

}

Members

fromJust T fromJust(): Return value if this is the Just!T instance, otherwise throw Exception.

isJust bool isJust [@property getter]: Return true if this is the Just!T instance, otherwise false.
isNothing bool isNothing [@property getter]: Return true if this is the Nothing!T instance, otherwise false.

just Maybe!T just(T value): A factory method to create Just(T) instance.
nothing Maybe!T nothing(): A factory method to create Nothing(T) instance.

1 auto maybe = Maybe!int.just(42);
2 if (maybe.isJust)
3 {
4    writeln(maybe.fromJust());
5 }

Output: