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{-# LANGUAGE Trustworthy #-}
{-# LANGUAGE CPP #-}
-----------------------------------------------------------------------------
-- |
-- Module : Data.Functor
-- Copyright : (c) The University of Glasgow 2001
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : provisional
-- Portability : portable
--
-- Functors: uniform action over a parameterized type, generalizing the
-- 'map' function on lists.
module Data.Functor
(
Functor(fmap),
(<$),
(<$>),
) where
#ifdef __GLASGOW_HASKELL__
import GHC.Base (Functor(..))
#else
(<$) :: Functor f => a -> f b -> f a
(<$) = fmap . const
#endif
infixl 4 <$>
-- | An infix synonym for 'fmap'.
(<$>) :: Functor f => (a -> b) -> f a -> f b
(<$>) = fmap
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