<div>On 10/18/07, Grant Rettke <<a href="mailto:grettke@acm.org">grettke@acm.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;"> Hi folks, I wanted to start by writing a macro to declare (MzLib) class properties. A class property feature looks like: (field (field-X null)) (define/public (X . args)     (if (null? args) x         (set! field-X (car args)))) Classes can look like this now: (define service-call%   (class* object% ()     (property customer-name)     (property customer-id)     (property call-type-code)     (property date-of-call-string)     (super-new))) I'm only learning about macros. That said, if you have a look at the macro (at the end), is there anything obviously wrong about it? right about it? any comments or advice? The next step is that I would like to be able to do this: (define service-call%   (class* object% ()     (property customer-name customer-id call-type-code date-of-call-string)     (super-new))) But I don't understand how to do that. Any ideas? For reading I am sticking with TSPL3 and the Help Desk. Anywhere else I should look?</blockquote><div> Recently, I've spent my weekends pestering Jens on similar topics.  In response to a similar question he reccomended "Two articles to start with are:   Writing hygienic macros in Scheme with syntax-case.   Kent Dybvig   <<a onclick="return top.js.OpenExtLink(window,event,this)" href="http://www.cs.indiana.edu/%7Edyb/pubs/tr356.pdf" target="_blank"> http://www.cs.indiana.edu/~dyb/pubs/tr356.pdf</a>> And in the PLT Scheme case:   Composable and Compilable macros   Matthew Flatt   <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://www.cs.utah.edu/plt/publications/macromod.pdf" target="_blank"> http://www.cs.utah.edu/plt/publications/macromod.pdf</a> If I recall correctly Oscar Waddell's thesis is also worth a read. And I believe Ryan's thesis will be about macros too." Of these, I've only had time to seriously look at the first report by Dybvig, and I like it, as it goes into much more depth than TSPL. As far as debugging goes, I have found that the following to be useful (syntax-case foo ()   ((pattern ...)    (begin (display #'(syntax stuff))(newline) #'(the macro expansion)))) When DrScheme displays the syntax object she will give you access to all its properties.  </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Best wishes, Grant Rettke </blockquote></div>