Maintainer | Ralf Laemmel, Joost Visser |
---|---|

Stability | experimental |

Portability | portable |

Safe Haskell | None |

Language | Haskell98 |

This module is part of `StrategyLib`

, a library of functional strategy
combinators, including combinators for generic traversal. This module
defines auxilliary monadic functions, some of which serve as parametric
polymorphic prototypes for actual strategy combinators.

- succeed :: Maybe x -> x
- mseq :: Monad m => (a -> m b) -> (b -> m c) -> a -> m c
- mlet :: Monad m => (a -> m b) -> (b -> a -> m c) -> a -> m c
- mchoice :: MonadPlus m => (a -> m b) -> (a -> m b) -> a -> m b
- argtype :: MonadPlus m => (x -> y) -> x -> m ()
- valtype :: MonadPlus m => x -> x -> m ()
- ifM :: MonadPlus m => m a -> (a -> m c) -> m c -> m c

# Recover from partiality

succeed :: Maybe x -> x Source

Force success. If the argument value corresponds to failure, a run-time error will occur.

# Prototypes for strategy combinators seq, let, choice

mseq :: Monad m => (a -> m b) -> (b -> m c) -> a -> m c Source

Sequential composition of monadic functions

mlet :: Monad m => (a -> m b) -> (b -> a -> m c) -> a -> m c Source

Sequential composition with value passing; a kind of monadic let.

mchoice :: MonadPlus m => (a -> m b) -> (a -> m b) -> a -> m b Source

Choice combinator for monadic functions