In this case, Alexis designed data/collection to work well with some of the
pre-existing Racket generic interfaces.
For example, since ddicts implement the gen:dict interface, you can use
them with data/collection already:
```
#lang racket
(require data/collection
data/ddict)
(define dd (ddict 1 2 3 4 5 6))
(extend dd '((7 . 8) (9 . 10)))
#|
produces:
#<ddict: '((9 . 10)
(7 . 8)
(5 . 6)
(3 . 4)
(1 . 2))>
|#
```
On Tue, Jan 31, 2017 at 4:49 PM, Ronie Uliana <ronie.uli...@gmail.com>
wrote:
> Let's assume I have a struct that is not mine (like ddict [
> https://pkgn.racket-lang.org/package/ddict], or some of pfds [
> https://pkgn.racket-lang.org/package/pfds]). I'd like to implement
> generics for them that also are not mine :p (like data/collection from
> Alexis King).
>
> 1 - Is it possible?
> 2 - How do I do that?
>
> I searched through generics documentation, but I think I completely missed
> that part =/
>
> []s an thx!
> Ronie
>
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