package climate

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Module Climate_stdlib.OptionSource

include module type of Option

Options

Sourcetype 'a t = 'a option =
  1. | None
  2. | Some of 'a

The type for option values. Either None or a value Some v.

Sourceval none : 'a option

none is None.

Sourceval some : 'a -> 'a option

some v is Some v.

Sourceval value : 'a option -> default:'a -> 'a

value o ~default is v if o is Some v and default otherwise.

Sourceval get : 'a option -> 'a

get o is v if o is Some v and raise otherwise.

Sourceval join : 'a option option -> 'a option

join oo is Some v if oo is Some (Some v) and None otherwise.

Sourceval fold : none:'a -> some:('b -> 'a) -> 'b option -> 'a

fold ~none ~some o is none if o is None and some v if o is Some v.

Predicates and comparisons

Sourceval is_none : 'a option -> bool

is_none o is true if and only if o is None.

Sourceval is_some : 'a option -> bool

is_some o is true if and only if o is Some o.

Sourceval compare : ('a -> 'a -> int) -> 'a option -> 'a option -> int

compare cmp o0 o1 is a total order on options using cmp to compare values wrapped by Some _. None is smaller than Some _ values.

Converting

Sourceval to_result : none:'e -> 'a option -> ('a, 'e) result

to_result ~none o is Ok v if o is Some v and Error none otherwise.

Sourceval to_list : 'a option -> 'a list

to_list o is [] if o is None and [v] if o is Some v.

Sourceval to_seq : 'a option -> 'a Seq.t

to_seq o is o as a sequence. None is the empty sequence and Some v is the singleton sequence containing v.

Sourceval map : 'a t -> f:('a -> 'b) -> 'b t
Sourceval bind : 'a t -> f:('a -> 'b t) -> 'b t
Sourceval iter : 'a t -> f:('a -> unit) -> unit
Sourceval equal : 'a t -> 'a t -> eq:('a -> 'a -> bool) -> bool