By default, struct defines an "opaque" structure. You can do something like this:
> (struct posn (x y) #:transparent) > (struct? (posn 3 4)) #t See the documentation for struct in the reference. HTH, --- nadeem On Sun, Sep 5, 2010 at 10:05 PM, 趙Frodo <frodogr...@gmail.com> wrote: > I don't know if I did something wrong or not, but this seems strange to me. > > Using #lang racket, in the interaction window from DrRacket (DrRacket, > version 5.0.1, english by PLT), > >> (struct posn (x y)) >> (struct? (posn 3 4)) > #f >> (struct-info? (posn 3 4)) > #f > #t >> > > So (posn 3 4) is not a struct in racket? The same goes for define-struct. > But > >> (struct-constructor-procedure? posn) > #t >> > > Usually how people define structure in Racket? > > Cheers, > Frodo > > > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
