<div>On 9/6/07, Eli Barzilay <<a href="mailto:eli@barzilay.org">eli@barzilay.org</a>> wrote:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> > The classes that you get from `struct-type->class' are intended for > generic function dispatching only.  Making <make> work with these will > require much more work.</blockquote><div> Yeah I'm finding that out the hard way :) As written in the message <a href="http://list.cs.brown.edu/pipermail/plt-scheme/2007-September/020471.html">http://list.cs.brown.edu/pipermail/plt-scheme/2007-September/020471.html </a>, I am able to get the initial part going by 1) modify extra.ss to export struct-type->class* 2) wrap around define-struct* and struct-type->class* but I ran into a few issues and have some questions: 1) why does a procedurized struct returns a swindle instance if called via <make>?  struct-type->class appear to catch whether a struct-type is procedure and changes the super class to <procedure-class>, but why do that when the returned instance cannot be called as a procedure? 2) Also, it appears that procedurized struct cannot be inherited in swindle object system.  Trying to do so either with my hacks or with struct-type->class would raise an error: ; with the sample code in <a href="http://list.cs.brown.edu/pipermail/plt-scheme/2007-September/020471.html">http://list.cs.brown.edu/pipermail/plt-scheme/2007-September/020471.html</a> > (defstruct* <foo1> (value)   (#:guard (lambda (value struct)              (values value)))   (#:procedure (lambda (x) x))) > (defstruct* (<foo2> <foo1>) ()) . . collects\swindle\tiny-clos.ss::7069: top-sort: invalid constraints Looking through the code it's not obvious where the constraint is created, but I am assuming that the design is that a procedure has a constraint that it cannot be inherited - correct?  If such struct cannot be inherited it would seem to limit generic function applicabilities. 3) if such integration is too far-fetched right now - does swindle integrate well with non swindlized structs? Any pointers are appreciated. Thanks! ;) yc </div></div>