{- Copyright (C) 2011 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@] * Whilst this particular function is the subject of many introductory examples to Haskell, the simple algorithms appropriate for that forum, leave a large margin for performance-improvement. This module provides the interface for alternative algorithms. * <http://mathworld.wolfram.com/Factorial.html>. -} module Factory.Math.Factorial( -- * Type-classes Algorithmic(..) ) where -- | Defines the methods expected of a /factorial/-algorithm. class Algorithmic algorithm where factorial :: (Integral i, Show i) => algorithm -> i -> i