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(*
* Copyright (C) 2006-2009 Citrix Systems Inc.
*
* This program 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; version 2.1 only. with the special
* exception on linking described in file LICENSE.
*
* This program 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.
*)
(** apply the clean_f function after fct function has been called.
* Even if fct raises an exception, clean_f is applied
*)
let exnhook = ref None
let finally fct clean_f =
let result = try
fct ();
with
exn ->
(match !exnhook with None -> () | Some f -> f exn);
clean_f (); raise exn in
clean_f ();
result
(* Those should go into the Opt module: *)
let maybe_with_default d f v =
match v with None -> d | Some x -> f x
(** if v is not none, apply f on it and return some value else return none. *)
let may f v = maybe_with_default None (fun x -> Some (f x)) v
(** default value to d if v is none. *)
let default d v = maybe_with_default d (fun x -> x) v
(** apply f on v if not none *)
let maybe f v = maybe_with_default () f v
(** if bool is false then we intercept and quiten any exception *)
let reraise_if bool fct =
try fct () with exn -> if bool then raise exn else ()
(** execute fct ignoring exceptions *)
let ignore_exn fct = try fct () with _ -> ()
(* non polymorphic ignore function *)
let ignore_int v = let (_: int) = v in ()
let ignore_int64 v = let (_: int64) = v in ()
let ignore_int32 v = let (_: int32) = v in ()
let ignore_string v = let (_: string) = v in ()
let ignore_float v = let (_: float) = v in ()
let ignore_bool v = let (_: bool) = v in ()
(* To avoid some parens: *)
(* composition of functions: *)
let (++) f g x = Fun.comp f g x
(* and application *)
let ($) f a = f a
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