IORef.hs

{-
 *  Programmer:	Piotr Borek
 *  E-mail:     piotrborek@op.pl
 *  Copyright 2015 Piotr Borek
 *
 *  Distributed under the terms of the GPL (GNU Public License)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-}

module Coin.Utils.IORef (
    module Data.IORef,
    atomicModifyIORef_',
    atomicReadIORef'
) where

import Data.IORef

atomicModifyIORef_' :: IORef a -> (a -> a) -> IO ()
atomicModifyIORef_' ref f = atomicModifyIORef' ref g
    where
        g x = (f x, ())

atomicReadIORef' :: IORef a -> IO a
atomicReadIORef' ref = atomicModifyIORef' ref g
    where
        g x = (x, x)