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 Source #

Minimal complete definition

Methods

Instances

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

General exceptions

Convert to a SomeException via toException before calling failure.