Hi,

This is a functional dependency:

http://www.haskell.org/haskellwiki/Functional_dependencies

[ ]s

Rodrigo

On Wed, Sep 5, 2012 at 9:13 AM, Christopher Howard <christopher.howard@frigidcode.com> wrote:
The MonadState class is defined as:

quote:
--------
class Monad m => MonadState s m | m -> s where
...etc...
--------

Please explain the part "| m -> s", that is, the use of the pipe symbol
and the right arrow symbol which follow "MonadState s m".


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