[racket] Type-class-like idiom in Racket?

2012/3/5 Helmut Rohrbacher <helmut.rohrbacher at gmail.com>

> Danny & Matthias,
>
> I hadn't known about structure properties. I think lumping enough
> syntactic sugar onto your syntax definitions, Matthais, might make it
> feasible to reproduce something to provide the functionality I'm looking
> for.
>
> The only thing is, how do you extend these properties to built-in types
> like LIST and VECTOR? I'm guessing that you'd need to wrap them in a
> user-defined type...
>

Or use structure properties to turn them into sequences (and then use for
and friends).

http://docs.racket-lang.org/reference/sequences.html?q=sequence%20property#(def._((lib._racket/private/base..rkt)._prop~3asequence))


-- 
Jens Axel Søgaard
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