Module Monad.Option_syntaxSource

Syntax module for Option. This is intended to be opened locally in functions which use option for control-flow. Within the scope of this module, the code can include binding operators, leading to a let-style syntax.

See also Option

Sourceval return : 'a -> 'a option

return x is Some x.

Sourceval fail : 'a option

fail is None. It is also an alias for Option.none.

Sourceval return_unit : unit option

return_unit is Some ().

Sourceval return_nil : 'a list option

return_nil is Some [].

Sourceval return_true : bool option

return_true is Some true.

Sourceval return_false : bool option

return_false is Some false.

Note that we do not provide return_some nor return_none. Both of these functions are possible but somewhat confusing and rarely useful in practice. If you need to carry options within a Option-monad computation (yielding to values of the type 'a option option), you need to do so by hand: return (Some …) and return None.

Sourceval (let*) : 'a option -> ('a -> 'b option) -> 'b option

let* is a binding operator alias for Option.bind.

Sourceval (and*) : 'a option -> 'b option -> ('a * 'b) option

and* is a binding operator alias for both.

Sourceval (let+) : 'a option -> ('a -> 'b) -> 'b option

let+ is a binding operator alias for Option.map.

Sourceval (and+) : 'a option -> 'b option -> ('a * 'b) option

and+ is a binding operator alias for both.

Sourceval both : 'a option -> 'b option -> ('a * 'b) option

both is the joining of two optional non-unit values. both a b is Some (x, y) iff a is Some x and b is Some y.