On Thu, Feb 24, 2011 at 2:42 PM, Andrew Coppin <andrewcop...@btinternet.com>wrote:
> Anybody have any hints on how to get around this? >> >> Use a lazy state monad? >> > > That's not going to work. It still needs to read the input to determine > which monadic action comes next, and hence what the final result will be. So > whether it forces the result or not, it still has to scan the entire input > before it can generate any output. > > >From the sound of it, you want some kind of lazy IO, driven/generated by a state monad. Check out the "safe-lazy-io". I've never used it, but the announcement is pretty convincing. http://www.haskell.org/pipermail/haskell/2009-March/021133.html
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