No, not really. I am looking for structures a la Common Lisp, as described in the example that I gave. The essential feature there is that the constructor may receive the structure's fields in any order. There is no ambiguity because each field value is associated with field tag.
I think I should be able to come up with a reverse-engineered version of that in Racket but I don't want to reinvent the wheel if it already exists. -- rr On Thu, Aug 16, 2012 at 10:44:08PM -0600, Richard Cleis wrote: > > Are you asking for stuff like this? > > http://docs.racket-lang.org/reference/define-struct.html > > On Aug 16, 2012, at 10:09 PM, Rouben Rostamian wrote: > > > Is there the equivalent of Common Lisp's /structure/ type in > > Racket? I looked through Racket's User Guide and Reference > > manuals but did not see something similar, although it's > > quite possible that I saw one but did not recognize it. > > > > Specifically, here is what I want. Consider the Common Lips > > definition of a /person/ structure: > > > > (defstruct person > > name > > age > > waist-size > > favorite-color) > > > > Then create an instance: > > > > (make-person :age 35 > > :favorite-color "blue" > > :name "Bob") > > > > The latter echos: > > > > #S(PERSON :NAME "Bob" :AGE 35 :WAIST-SIZE NIL :FAVORITE-COLOR "blue") > > > > Let's note that the order of fields when invoking /make-person/ > > need not be the same as the order in which the /person/ > > structure is defined. > > > > Furthermore, since /waist-size/ was not specified at invocation, > > it was assigned NIL. > > > > -- > > Rouben Rostamian > > > > ____________________ > > Racket Users list: > > http://lists.racket-lang.org/users > > ____________________ Racket Users list: http://lists.racket-lang.org/users
