I hadn't seen that before, thanks. My code wouldn't be that useful as it depends on some of my datatypes. I don't know some basic things here since I'm so new to Haskell. For example, am I to assume that I need to create my own instance of State and then define get and put for it? Some of the examples seem to just use functions that manipulate a state but do not create a new datatype.

----- Original Message ----
From: Arie Peterson <ariep@xs4all.nl>
To: haskell-cafe@haskell.org
Sent: Monday, July 2, 2007 2:46:14 PM
Subject: Re: [Haskell-cafe] Very simple parser

Did you look at the documentation for the State monad?
<http://haskell.org/ghc/docs/latest/html/libraries/mtl/Control-Monad-State-Lazy.html>
It also contains some examples.

Getting the next instruction sounds like a job for 'get'; to remove it
from the state you might use 'put' or 'modify'.

If this doesn't help, can you show something you tried?

Greetings,

Arie

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