control-monad-queue-0.0.9: Data/Queue/Class.hs

-----------------------------------------------------------------------------
-- |
-- Module      :  Data.Queue.Class
-- Copyright   :  (c) Leon P Smith 2009
-- License     :  BSD3
--
-- Maintainer  :  leon at melding-monads dot com
-- Stability   :  experimental
-- Portability :  portable
--
-----------------------------------------------------------------------------


module Data.Queue.Class
     ( Queue(empty, enque, deque)
     ) where

class Queue q where
   empty :: q a
   enque :: a   -> q a -> q a
   deque :: q a -> (Maybe a, q a)