[Haskell-cafe] IO and lazyness.
dav.vire+haskell at gmail.com
Tue Mar 6 16:22:02 EST 2007
On 3/6/07, mm <schneegloeckchen at gmx.li> wrote:
> I cannot help you with your question more than pointing you to
> where Simon Marlow explains how to avoid "IO.bracket".
I'm using Control.Exception's bracket.
Also, following Jeremy's advice, I replaced the last line of rechf2
with return $! rech r $ lines f and indeed it works.
I don't understand why it doesn't without the !
The documentation for hGetContents says the items are read on demand.
the function rech needs the strings so they should be read on demand.
This confuses me :(
More information about the Haskell-Cafe