File: option.ml

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(*
 * Option - functions for the option type
 * Copyright (C) 2003 Nicolas Cannasse
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version,
 * with the special exception on linking described in file LICENSE.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *)
 
exception No_value

let may f = function
  | None -> ()
  | Some v -> f v

let map f = function
  | None -> None
  | Some v -> Some (f v)

let default v = function
  | None -> v
  | Some v -> v

let is_some = function
  | None -> false
  | _ -> true

let is_none = function
  | None -> true
  | _ -> false

let get = function
  | None -> raise No_value
  | Some v -> v

let map_default f v = function
  | None -> v
  | Some v2 -> f v2