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Diffstat (limited to 'src/compiler/GF/Data/Utilities.hs')
| -rw-r--r-- | src/compiler/GF/Data/Utilities.hs | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/src/compiler/GF/Data/Utilities.hs b/src/compiler/GF/Data/Utilities.hs index 50269bef1..f953938c8 100644 --- a/src/compiler/GF/Data/Utilities.hs +++ b/src/compiler/GF/Data/Utilities.hs @@ -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 |