package extlib

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in-package search v0.2.0

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exception No_value

exception Option_error of string * string

exception Option_help

type !'a t = {

}

val get : 'a t -> 'a

val set : 'a t -> 'a -> unit

val opt : 'a t -> 'a option

val is_set : 'a t -> bool

val value_option : 
  string ->
  'a option ->
  (string -> 'a) ->
  (exn -> string -> string) ->
  'a t

val callback_option : 
  string ->
  (string -> 'a) ->
  (exn -> string -> string) ->
  ('a -> unit) ->
  unit t