Created
May 22, 2015 10:03
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| import Control.Monad.Logic | |
| import Control.Monad.Trans.Maybe | |
| zipLogic :: (MonadLogic m) => m a -> m b -> m (a, b) | |
| zipLogic gx gy = | |
| maybe mzero return <=< runMaybeT $ do | |
| (x, rx) <- MaybeT (msplit gx) | |
| (y, ry) <- MaybeT (msplit gy) | |
| lift $ return (x, y) `mplus` zipLogic rx ry |
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