Safe Haskell	Safe
Language	Haskell98

Control.Failure

Contents

Description

Type classes for returning failures.

Note: This module used to contain a lot more functionality, but I believe it was unused functionality. If you want any of it back, just email me.

Synopsis

Type class

class Monad f => Failure e f where #

Minimal complete definition

Methods

failure :: e -> f v #

Instances

Exception e => Failure e IO #
Methods failure :: e -> IO v #
Failure e [] #
Methods failure :: e -> [v] #
Failure e Maybe #
Methods failure :: e -> Maybe v #
(MonadTrans t, Failure e m, Monad (t m)) => Failure e (t m) #	Instance for all monad transformers, simply lift the `failure` into the base monad.
Methods failure :: e -> t m v #
Failure e (Either e) #
Methods failure :: e -> Either e v #

General exceptions

Convert to a SomeException via toException before calling failure.