The control-monad-exception package

[Tags: library, public-domain]

This package provides explicitly typed, checked exceptions as a library. /Example/

> data Expr = Add Expr Expr | Div Expr Expr | Val Double > eval (Val x) = return x > eval (Add a1 a2) = do > v1 <- eval a1 > v2 <- eval a2 > let sum = v1 + v2 > if sum < v1 || sum < v2 then throw SumOverflow else return sum > eval (Div a1 a2) = do > v1 <- eval a1 > v2 <- eval a2 > if v2 == 0 then throw DivideByZero else return (v1 / v2)

> data DivideByZero = DivideByZero deriving (Show, Typeable) > data SumOverflow = SumOverflow deriving (Show, Typeable)

> instance Exception DivideByZero > instance Exception SumOverflow

GHCi infers the following types

> eval :: (Throws DivideByZero l, Throws SumOverflow l) => Expr -> EM l Double > eval `catch` \ (e::DivideByZero) -> return (-1) :: Throws SumOverflow l => Expr -> EM l Double > runEM(eval `catch` \ (e::SomeException) -> return (-1)) :: Expr -> Double New in version 0.4: * (optionally) Unchecked exceptions (with 'UncaughtException') * Exception stack traces (with 'WithSrcLoc')


Properties

Versions0.1, 0.1.1, 0.1.2, 0.2, 0.3, 0.3.1, 0.3.2, 0.4, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6, 0.4.7, 0.4.8, 0.5, 0.6, 0.8.0, 0.8.0.1, 0.8.0.2, 0.8.0.3, 0.8.0.4, 0.9.0, 0.9.1, 0.10.0, 0.10.1, 0.10.2, 0.10.3, 0.10.3.1, 0.11.1
Dependenciesbase (>=3.0 && <4), extensible-exceptions (==0.1.*), monads-fd (==0.0.*), pretty, template-haskell, transformers (>=0.0.1 && <0.2) or
base (>=3.0 && <4), extensible-exceptions (==0.1.*), mtl, pretty, template-haskell or
base (==4.*), monads-fd (==0.0.*), pretty, template-haskell, transformers (>=0.0.1 && <0.2) or
base (==4.*), mtl, pretty, template-haskell
LicensePublicDomain
AuthorPepe Iborra
Maintainerpepeiborra@gmail.com
Stabilityexperimental
CategoryControl, Monads
Home pagehttp://safe-tools.dsic.upv.es/mediawiki/index.php/Jose_Iborra/Papers/Exceptions
UploadedWed Sep 16 10:29:12 UTC 2009 by PepeIborra
Downloads3196 total (118 in last 30 days)
StatusDocs not available [build log]
All reported builds failed [all 1 reports]

Modules

Flags

NameDescriptionDefault
transformersUse transformers and monads-fd instead of mtlEnabled
extensibleexceptionsUse extensible-exception packageDisabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

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