module Generic_util_option: sig .. end
Operations on option types.
val option : ('a -> 'b) -> 'a option -> 'b option
option f is the functorial action of the functor
'a option:
Some x -> Some (f x)
None -> None
val map : ('a -> 'b) -> 'a option -> 'b option
val functorial : App.option' Functor.functorial
val unopt : 'a -> ('b -> 'a) -> 'b option -> 'a
unopt s n eliminates an option value by replacing the constructor Some by s and None by n.
val get_some : 'a option -> 'a
Partial function
get_some (Some x) = x
Raises Failed on None
val opt_try : 'a Lazy.t -> 'a option
opt_try x forces the lazy value x. If any exception is raised,
None is returned, otherwise Some x is returned.
val some_if : ('a -> bool) -> 'a -> 'a option
some_if f x = Some x if f x is true, None otherwise
val unopt_try : 'a -> ('b -> 'a) -> 'b Lazy.t -> 'a
unopt_try s n x = unopt s n (opt_try x)
val leftist_plus : 'a option -> 'a option -> 'a option
Monadic plus, the left argument has priority on the right
in case both options have a value.
val to_list : 'a option -> 'a list