optional.optional

Optional type

Members

no auto no(): Type constructor for an optional having no value of T
orElse U orElse(Optional!T opt, U value)
auto ref orElse(Optional!T opt): Returns the value contained within the optional _or else_ another value if there's no!T
some auto ref some(T value): Type constructor for an optional having some value of T
toNullable auto toNullable(Optional!T opt): Turns an Optional in to a Nullable
toOptional auto toOptional(Nullable!T nullable): Converts a range or Nullable to an optional type
unwrap auto ref unwrap(Optional!T opt): Get pointer to value. If T is a reference type then T is returned

None struct None: Undocumented in source.
Optional struct Optional(T): Optional type. Also known as a Maybe or Option type in some languages.

match template match(handlers...): Calls an appropriate handler depending on if the optional has a value or not

none auto none;: Represents an empty optional value. This is used to set Optionals to have no value or for comparisons