[Haskell-cafe] Re: How to reliably open and close resources inMonadIO in the presence of exceptions?

[Bayley, Alistair]

> -----Original Message-----
> From: haskell-cafe-bounces at haskell.org 
> [mailto:haskell-cafe-bounces at haskell.org] On Behalf Of Bas van Dijk
> 
> 
> I could of course write a genAlloca if the MonadIO class was extended
> with a bracket method:
> 
> Besides extending MonadIO with bracket, maybe it's also useful to
> extend it with:
> 
> catch :: Exception e => m a -> (e -> m a) -> m a

You might want this library:
http://hackage.haskell.org/packages/archive/MonadCatchIO-transformers/0.
0.1.0/doc/html/Control-Monad-CatchIO.html

There's also an mtl version; not sure which is to be prefered.

Alistair
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