[Haskell-cafe] Data.Binary suboptimal instance
lemming at henning-thielemann.de
Fri May 22 15:34:50 EDT 2009
On Fri, 22 May 2009, Andrew Coppin wrote:
> So lately I've been working on a little program to generate trippy graphics.
> (Indeed, some of you may remember it from a few years back...) Anyway,
> getting to the point, I just restructured my program. As part of the
> restructuring, I got rid of all the jiggery-pokery with Data.Array.Storable
> and so forth and decided to use Data.Binary.
> My first problem was quite simple. I want to write a program that reads an
> item from the input file, processes it, writes it to the output file, and
> repeats until the input file is empty. Data.Binary doesn't appear to provide
> any obvious way to do this. You can't be in the Get and Put monads
> simultaneously, and I can't figure out how to interleave them.
You can! - It's again time to point out that Put shouldn't be a monad, but
a monoid. But as it is, Put is a Writer monad on top of the Builder
monoid. Better use that Builder monoid directly.
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