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Merged
merged 2 commits into from
Dec 16, 2014
Merged

Add execWriterT #23

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ac33773
Add execWriterT
MichaelXavier Dec 4, 2014
2c45993
Drop unnecessary Monad instance for Apply
MichaelXavier Dec 16, 2014
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6 changes: 4 additions & 2 deletions docs/Module.md
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Expand Up @@ -667,9 +667,9 @@

### Values

evalStateT :: forall s m a. (Monad m) => StateT s m a -> s -> m a
evalStateT :: forall s m a. (Apply m) => StateT s m a -> s -> m a

execStateT :: forall s m a. (Monad m) => StateT s m a -> s -> m s
execStateT :: forall s m a. (Apply m) => StateT s m a -> s -> m s

liftCallCCState :: forall s m a b. (((Tuple a s -> m (Tuple b s)) -> m (Tuple a s)) -> m (Tuple a s)) -> ((a -> StateT s m b) -> StateT s m a) -> StateT s m a

Expand Down Expand Up @@ -779,6 +779,8 @@

### Values

execWriterT :: forall w m a. (Apply m) => WriterT w m a -> m w

liftCallCCWriter :: forall w m a b. (Monoid w) => (((Tuple a w -> m (Tuple b w)) -> m (Tuple a w)) -> m (Tuple a w)) -> ((a -> WriterT w m b) -> WriterT w m a) -> WriterT w m a

liftCatchWriter :: forall w m e a. (m (Tuple a w) -> (e -> m (Tuple a w)) -> m (Tuple a w)) -> WriterT w m a -> (e -> WriterT w m a) -> WriterT w m a
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8 changes: 4 additions & 4 deletions src/Control/Monad/State/Trans.purs
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Expand Up @@ -13,11 +13,11 @@ newtype StateT s m a = StateT (s -> m (Tuple a s))
runStateT :: forall s m a. StateT s m a -> s -> m (Tuple a s)
runStateT (StateT s) = s

evalStateT :: forall s m a. (Monad m) => StateT s m a -> s -> m a
evalStateT m s = runStateT m s >>= \(Tuple x _) -> return x
evalStateT :: forall s m a. (Apply m) => StateT s m a -> s -> m a
evalStateT m s = fst <$> runStateT m s

execStateT :: forall s m a. (Monad m) => StateT s m a -> s -> m s
execStateT m s = runStateT m s >>= \(Tuple _ s) -> return s
execStateT :: forall s m a. (Apply m) => StateT s m a -> s -> m s
execStateT m s = snd <$> runStateT m s

mapStateT :: forall s m1 m2 a b. (m1 (Tuple a s) -> m2 (Tuple b s)) -> StateT s m1 a -> StateT s m2 b
mapStateT f m = StateT $ f <<< runStateT m
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3 changes: 3 additions & 0 deletions src/Control/Monad/Writer/Trans.purs
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Expand Up @@ -13,6 +13,9 @@ newtype WriterT w m a = WriterT (m (Tuple a w))
runWriterT :: forall w m a. WriterT w m a -> m (Tuple a w)
runWriterT (WriterT x) = x

execWriterT :: forall w m a. (Apply m) => WriterT w m a -> m w
execWriterT m = snd <$> runWriterT m

mapWriterT :: forall w1 w2 m1 m2 a b. (m1 (Tuple a w1) -> m2 (Tuple b w2)) -> WriterT w1 m1 a -> WriterT w2 m2 b
mapWriterT f m = WriterT $ f (runWriterT m)

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