SelfValidate.hs

{-
	Copyright (C) 2010 Dr. Alistair Ward

	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
	(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, see <http://www.gnu.org/licenses/>.
-}
{- |
 [@AUTHOR@]	Dr. Alistair Ward

 [@DESCRIPTION@]	A class to define the simple interface, to which data which can self-validation, should conform.
-}

module ToolShed.SelfValidate(
-- * Type-classes
	SelfValidator(..)
) where

-- | The interface to which data which can self-validate should conform.
class SelfValidator a	where
	isValid	:: a -> Bool	-- ^ The data which implements this interface should return 'True' if internally consistent.

instance SelfValidator a => SelfValidator [a]	where
	isValid	= all isValid	--NB: a null list is presumed to be OK.