On Mon, Apr 20, 2020 at 6:50 PM Jon Zeppieri <zeppi...@gmail.com> wrote:

> There's no trick to it:
>
> #lang racket/base
>
> (require racket/generic)
>
> (define-generics foo
>   (foo-do foo x))
>
> (struct thing (x)
>   #:methods gen:foo
>   [(define (foo-do f x)
>      (thing x))])
>
>
> On Mon, Apr 20, 2020 at 6:32 PM Kevin Forchione <lyss...@gmail.com> wrote:
> >
> > Hi guys,
> > How do you return an instance of the structure type from the struct’s
> #:methods? This is would seem to be a common situation, but it has me
> stumped.
> >
> > Kevin
>

<self-promotion>

Note that if you're getting fancy with structs then you might want to check
out: https://docs.racket-lang.org/struct-plus-plus/index.html

Among other things, it auto-generates functional setters and functional
updaters, a keyword constructor, dotted accessors, reflection data, and
allows for contracts on individual fields and enforcement of relationships
between fields.

</self-promotion>

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