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|
@BEGIN_FROM_4_08_0@
include Option
@END_FROM_4_08_0@
@BEGIN_BEFORE_4_08_0@
type 'a t = 'a option =
| None
| Some of 'a
let none = None
let some x = Some x
let value o ~default =
match o with
| None -> default
| Some v -> v
let get o =
match o with
| None -> invalid_arg "option is None"
| Some v -> v
let bind o f =
match o with
| None -> None
| Some v -> f v
let join o =
match o with
| None -> None
| Some v -> v
let map f o =
match o with
| None -> None
| Some v -> Some (f v)
let fold ~none ~some o =
match o with
| None -> none
| Some v -> some v
let iter f o =
match o with
| None -> ()
| Some v -> f v
let is_none o = o = None
let is_some o = o <> None
let equal eq o o' =
match o, o' with
| None, None -> true
| Some v, Some v' -> eq v v'
| None, Some _ | Some _, None -> false
let compare cmp o o' =
match o, o' with
| None, None -> 0
| None, Some _ -> -1
| Some _, None -> 1
| Some v, Some v' -> cmp v v'
let to_result ~none o =
match o with
| None -> Stdcompat__pervasives.Error none
| Some v -> Stdcompat__pervasives.Ok v
let to_list o =
match o with
| None -> []
| Some v -> [v]
let to_seq o =
match o with
| Some v -> fun () -> Stdcompat__seq.Cons (v, Stdcompat__seq.empty)
| None -> Stdcompat__seq.empty
@END_BEFORE_4_08_0@
|
