Re: Order of macroexpansion

In article <47a1c9f7$0$90267$14726298@xxxxxxxxxxxxxxx>,
Peter Hildebrandt <peter.hildebrandt@xxxxxxxxx> wrote:

Say, I have the macros outer and inner, and I write the following:

(outer 10 (inner +1))

Is it specified, in which order outer and inner are expanded?


Outer is expanded. It returns a new form.

Whatever 'outer' returns will then be evaluated
as usual. Rember, the expansion of outer might
or might not have the 'inner' form.


I see
that in sbcl outer is expanded before inner, and I can do the following:

(let (store)
(defmacro outer (val &body body) (setf store val) `(progn ,@body))
(defmacro inner (expr) `(,expr ,store)))

That is, store is first setf'd by outer, then read by inner.

Is this implementation specific, or can I rely on this?

If I have missed the obvious in the hyperspec, I'd be grateful for the
pointer.

Thanks,
Peter
.

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