On Thu, Oct 18, 2007 at 01:16:37PM +0100, Magnus Therning wrote:
> On Thu, Oct 18, 2007 at 20:58:45 +1000, Matthew Brecknell wrote:
> >For a less hackish solution, you need to do a bit more work. Again, this
> >is untested.
> >
> >> loadAndCheck fn = bracket (openFile fn ReadMode) hClose checkContents
> >> checkContents fh = do { s <- hGetContents fh; return $! hasEmpty s }
> >
> >Note the explicit close, and "return $!" to ensure that hasEmpty has
> >done its work before the file is closed.
>
> Ah, `bracket` is a handy function to know!Note that you almost never want to use the bracket defined in Haskell98, nor the one in IO.Error. You want the bracket defined in Control.Exception. -- David Roundy Department of Physics Oregon State University
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