On Sun, 10 Feb 2008, Luke Palmer wrote:
> Quite frequently.
>
> Here are a few examples from my own code:
>
> For "functional references" (representing a bidirectional function
> from a data type to a part of itself (for example the first element of
> a pair)).
>
> > data Accessor s a
> > = Accessor { get :: s -> a
> > , set :: a -> s -> s
> > }
>
> My quantum computation arrow (really in the realm of "concrete, useful
> things", huh? :-)
The pattern seems to be common enough to be turned into a package.
http://www.haskell.org/haskellwiki/?title=Record_access&action=history
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