[plt-scheme] generic programming in plt scheme

For the in-builtin data-types you'd have to define the function in the
usual way:

(define (foo x)
  [(vector? x) ...]
  [(pair? v) ...]
  ...)

You get extensibility by using structure properties.

In very recent builds I believe Jay McCarthy has implemented a library
to make this easier. It should be in the unstable collection.

N.

On Sun, Apr 25, 2010 at 7:05 AM, Skeptic . <skeptic2000 at hotmail.com> wrote:
>
> Hi,
> What would be the idiomatic way of defining a generic length procedure over,
> let's say lists, vectors, strings and user-defined streams, in PLT Scheme ?
> Thanks.