On Tue, 3 Sep 2002 20:08:32 +0100 "Duncan Coutts" <duncan@coutts.uklinux.net> wrote:

On Tue, 3 Sep 2002 14:49:45 -0400 Sengan.Baring-Gould@nsc.com wrote:

...

Is there any way to make the IO Monad lazy?

The simplified version of my problem is that I want to generate an infinite structure from an IOArray and then consume only the relevant part of it.

Yes, unsafeInterleaveIO.

http://www.haskell.org/ghc/docs/latest/html/base/System.IO.Unsafe.html#unsaf...

This is how getContents is implemented so that it reads the file lazily.

Be careful of course it is "unsafe".

Duncan

Excellent. Thanks a lot, Sengan