Thank you for more examples! I want to learn some basic macro programming in Chicken. However, it seems there are multiple macro definition APIs in Chicken: define-syntax, syntax-rules, syntax-case, define-macro. Which one should I start with?
Also, I have heard that, different from Lisp, macro programming in Scheme is not recommended. Is it true? Thank you! Jinsong On Fri, May 29, 2015 at 7:44 PM, Michele La Monaca < mikele.chic...@lamonaca.net> wrote: > On Fri, May 29, 2015 at 3:10 AM, Jinsong Liang <jinsongli...@gmail.com> > wrote: > > Thank you Michele! This is a nice example. > > Nice but maybe not very useful: > > (apply-syntax or (#f (+ 1 2) (print "hello"))) > > is just a longer and more cumbersome version of > > (or (#f (+ 1 2) (print "hello"))) > > A far more valuable macro is the following: > > (define-macro apply-any > (lambda (_ lst) > (eval `(cons ',_ ,lst)))) > > (define l '(#f (+ 1 2) (print "hello"))) > (apply-any or l) > > => 3 > > (let ((x 9)) (apply-any or '(#f (+ x 1) (print "hello")))) > > => 10 > > (apply-any + (list 1 2 3)) > > => 6 > > Regards, > Michele > > _______________________________________________ > Chicken-users mailing list > Chicken-users@nongnu.org > https://lists.nongnu.org/mailman/listinfo/chicken-users >
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