Yes, that’s what I meant. But beware! This is a quasi OO style. — Matthias
p.s. In plain Racket, structs serve as an opaque carrier of values. > On Apr 24, 2016, at 1:56 PM, Benjamin Greenman <benjaminlgreen...@gmail.com> > wrote: > > > On Sun, Apr 24, 2016 at 1:47 PM, Daniel Karch <danielka...@gmail.com > <mailto:danielka...@gmail.com>> wrote: > how this could be done with structures > > One way is to consider the struct definition as an interface. Then different > values can implements the same interface & be used in a uniform way. > > Here's a struct that I used as an interface for web scrapers. (Scraping > definitions of English words from dictionary web sites) > https://github.com/bennn/iPoe/blob/master/ipoe/private/scrape/scrape-words.rkt#L42 > > <https://github.com/bennn/iPoe/blob/master/ipoe/private/scrape/scrape-words.rkt#L42> > > With that definition (and `prop:procedure` to make instances of the struct > callable), it's easy to write a function that queries a bunch of web scrapers > in order and returns as soon as one scraper finds a result. > https://github.com/bennn/iPoe/blob/master/ipoe/private/scrape/scrape-words.rkt#L32 > > <https://github.com/bennn/iPoe/blob/master/ipoe/private/scrape/scrape-words.rkt#L32> > > The above code is untyped, but should work in Typed Racket. If you want I can > port an example. > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
