returning multiple values from macro
Hello
I'm writing a small machine simulator in CL, using tagbody/go to
define the outer-most structure.
Each instruction looks something like this:
:state-instruction4
(some-debugging-code)
(... implementation of instruction using 'go' to make state
transitions ...)
My question is: How can I define a macro to replace that by something
like:
(state instruction4)
(... implementation of instruction ...)
where the 'state' defmacro should return two things: a symbol for the
target of the 'go', and a form of debugging code.
I wasn't able to find a way to return multiple values such that one of
them would be outside of forms. I thought perhaps of wrapping the
whole tagbody in a macro and walking and rewriting all the code
inside, but that seemed overly complex. (And made me feel like I was
missing something obvious when I started to try to write it!)
Thank you for any suggestions. Noob-ishly yours,
Scott
.
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