On Fri, 2006-07-14 at 13:30 +0100, Luís Oliveira wrote: > See inc-pointer. > <http://common-lisp.net/project/cffi/manual/html_node/ > inc_002dpointer.html> > > (setf *stack-pointer* (inc-pointer *stack-pointer* 1)) should work. > You can abstract that with a simple macro: > > (defmacro incf-pointer (place &optional (offset 1)) > `(setf ,place (inc-pointer ,place ,offset))) > > Any objections to adding this macro to CFFI?
This evaluates the PLACE forms twice. If I follow correctly, this can be more generally solved with a cross-platform setf-expander for POINTER-ADDRESS that requires its PTR arg to be a place, whereupon things like (incf (pointer-address *ptr*)) and any other place-modifier should work. -- Stephen Compall http://scompall.nocandysw.com/blog
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