DBus/Types/Serial.lhs

% Copyright (C) 2009 John Millikin % % 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 3 of the License, or % 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, see . \ignore{ \begin{code}

module DBus.Types.Serial
	( -- * Message serials
	  Serial (..)
	, nextSerial
	, firstSerial
	) where

import Data.Word (Word32)
import qualified DBus.Types.Atom as A
import qualified DBus.Types.Containers as C
import DBus.Types.Signature (mkSignature')

\end{code} } \subsubsection{Message Serials} \begin{code}

newtype Serial = Serial Word32
	deriving (Eq, Ord)

instance Show Serial where
	show (Serial x) = show x

instance A.Atomic Serial where
	toAtom (Serial x) = A.toAtom x

instance C.Variable Serial where
	defaultSignature _ = mkSignature' "u"
	toVariant (Serial x) = C.toVariant x
	fromVariant = fmap Serial . C.fromVariant

\end{code} \begin{code}

nextSerial :: Serial -> Serial
nextSerial (Serial x) = Serial (x + 1)

\end{code} \begin{code}

firstSerial :: Serial
firstSerial = Serial 1

\end{code}