Safe Haskell | None |
---|---|

Language | Haskell98 |

Use lazy I/O for consuming the contents of a source. Warning: All normal
warnings of lazy I/O apply. In particular, if you are using this with a
`ResourceT`

transformer, you must force the list to be evaluated before
exiting the `ResourceT`

.

- lazyConsume :: (MonadBaseControl IO m, MonadActive m) => Source m a -> m [a]
- class Monad m => MonadActive m where
- monadActive :: m Bool

# Documentation

lazyConsume :: (MonadBaseControl IO m, MonadActive m) => Source m a -> m [a] Source

Use lazy I/O to consume all elements from a `Source`

.

This function relies on `monadActive`

to determine if the underlying monadic
state has been closed.

Since 0.3.0

class Monad m => MonadActive m where Source

Determine if some monad is still active. This is intended to prevent usage
of a monadic state after it has been closed. This is necessary for such
cases as lazy I/O, where an unevaluated thunk may still refer to a
closed `ResourceT`

.

Since 0.3.0

monadActive :: m Bool Source

MonadActive IO | |

MonadActive Identity | |

MonadActive (ST s) | |

MonadActive (ST s) | |

MonadActive m => MonadActive (MaybeT m) | |

MonadActive m => MonadActive (ListT m) | |

MonadActive m => MonadActive (IdentityT m) | |

(MonadIO m, MonadActive m) => MonadActive (ResourceT m) | |

(Monoid w, MonadActive m) => MonadActive (WriterT w m) | |

(Monoid w, MonadActive m) => MonadActive (WriterT w m) | |

MonadActive m => MonadActive (StateT s m) | |

MonadActive m => MonadActive (StateT s m) | |

MonadActive m => MonadActive (ReaderT r m) | |

(Error e, MonadActive m) => MonadActive (ErrorT e m) | |

MonadActive m => MonadActive (ConduitM i o m) | |

(Monoid w, MonadActive m) => MonadActive (RWST r w s m) | |

(Monoid w, MonadActive m) => MonadActive (RWST r w s m) | |

MonadActive m => MonadActive (Pipe l i o u m) |