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Some changed/new utility functions

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GF.Data.Utilities:  Rename mapFst to apFst, mapSnd to apSnd.
		    Add apBoth, mapFst, mapSnd, mapBoth.
GF.Data.Operations: Remove onSnd (same as apSnd)
This commit is contained in:
hallgren
2012-11-07 15:31:45 +00:00
parent 64cbf59dac
commit a912ad813d
2 changed files with 14 additions and 8 deletions
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17
src/compiler/GF/Data/Utilities.hs
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@@ -130,11 +130,20 @@ both f g x y = g (f x) (f y)
-- * functions on pairs
mapFst :: (a -> a') -> (a, b) -> (a', b)
mapFst f (a, b) = (f a, b)
apFst :: (a -> a') -> (a, b) -> (a', b)
apFst f (a, b) = (f a, b)
mapSnd :: (b -> b') -> (a, b) -> (a, b')
mapSnd f (a, b) = (a, f b)
apSnd :: (b -> b') -> (a, b) -> (a, b')
apSnd f (a, b) = (a, f b)
apBoth :: (a -> b) -> (a, a) -> (b, b)
apBoth f (x, y) = (f x, f y)
-- * functions on lists of pairs
mapFst = map . apFst
mapSnd = map . apSnd
mapBoth = map . apBoth
-- * functions on monads