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| author |  Joey Hess <joey@kitenet.net> | 2012-01-02 14:54:23 -0400 |
|---|---|---|
| committer | Joey Hess <joey@kitenet.net> | 2012-01-03 00:11:00 -0400 |
| commit | fc80b8d96bf287a0b83c1402e3a7c5ebfc7bc4a4 (patch) | |
| tree | 344c45f3bf1cd263e80bbb456700574b95ba90fd /Utility/Monad.hs | |
| parent | 5cd44282a92dd6fa7eacc62858c8b8e553590195 (diff) | |
factor observe_
Diffstat (limited to 'Utility/Monad.hs')
| -rw-r--r-- | Utility/Monad.hs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Utility/Monad.hs b/Utility/Monad.hs index 9e2a16e8c..7f9c7b1bc 100644 --- a/Utility/Monad.hs +++ b/Utility/Monad.hs @@ -36,3 +36,7 @@ observe observer a = do r <- a _ <- observer r return r + +{- Like observe, but the observer is not passed the value. -} +observe_ :: (Monad m) => m b -> m a -> m a +observe_ observer = observe (const observer) |