Copyright	© 2009 Matt Morrow & Dan Peebles © 2013 Liyang HU
License	see LICENSE
Maintainer	spoon@liyang.hu
Stability	experimental
Portability	non-portable (Scoped Type Variables)
Safe Haskell	None
Language	Haskell2010

Control.Spoon

Description

Two functions for catching pureish exceptions in pure values. This library considers pureish to be any error call or undefined, failed pattern matches, arithmetic exceptions, and array bounds exceptions.

Synopsis

type Handles a = [Handler (Maybe a)]
spoon :: NFData a => a -> Maybe a
spoonDefaultHandles :: Handles a
spoonWithHandles :: NFData a => Handles a -> a -> Maybe a
teaspoon :: a -> Maybe a
teaspoonWithHandles :: Handles a -> a -> Maybe a

Documentation

type Handles a = [Handler (Maybe a)] Source #

spoon :: NFData a => a -> Maybe a Source #

Evaluate a value to normal form and return Nothing if any exceptions are thrown during evaluation. For any error-free value, spoon = Just.

spoonDefaultHandles :: Handles a Source #

spoonWithHandles :: NFData a => Handles a -> a -> Maybe a Source #

Evaluate a value to normal form and return Nothing if any exceptions are thrown during evaluation. For any error-free value, spoon = Just.

teaspoon :: a -> Maybe a Source #

Like spoon, but only evaluates to WHNF.

teaspoonWithHandles :: Handles a -> a -> Maybe a Source #