On 2012-08-21 12:45:03 -0400, as...@racket-lang.org wrote: > | This enables the use of polymorphic contracts with generic > | interfaces and their instances. >
If you're curious how this can be used, I have an example up as a Gist that I've also checked in as a test: https://gist.github.com/3292447 It reminds me of type classes since the generic functions themselves are protected by polymorphic contracts (like how type class definitions usually consist of polymorphic operations) and you can specify more specific contracts for the instances of the interface (like instantiating a type class at some type). One caveat is that this doesn't work easily for generic functions that might also dispatch to non-struct datatypes (e.g., dictionaries with built-in hashes). You have to write more complicated contracts to handle these. Cheers, Asumu _________________________ Racket Developers list: http://lists.racket-lang.org/dev
