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Try instance for Attempt #1

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Jun 26, 2011
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7 changes: 7 additions & 0 deletions Data/Attempt.hs
Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@
{-# LANGUAGE ExistentialQuantification #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE Rank2Types #-}
{-# LANGUAGE TypeFamilies #-}

---------------------------------------------------------
--
-- Module : Data.Attempt
Expand Down Expand Up @@ -80,6 +82,11 @@ instance E.Exception e => WrapFailure e Attempt where
wrapFailure _ (Success v) = Success v
wrapFailure f (Failure e) = Failure $ f e

instance Try Attempt where
type Error Attempt = E.SomeException
try (Success v) = return v
try (Failure e) = failure $ E.toException e

-- | Any type which can be converted from an 'Attempt'. The included instances are your \"usual suspects\" for dealing with error handling. They include:
--
-- 'IO': For the IO instance, any exceptions in the 'Attempt' are thrown as
Expand Down