[pro] [Q] introspecting setf expanders
didier at lrde.epita.fr
Mon Oct 8 15:38:42 UTC 2012
Pascal Costanza wrote:
> Just guessing: If you see that the writer form is a funcall to a setf
> function, you can then check with fboundp if such a function actually
> exists. This is probably a bit shaky, but maybe good enough for
> practical purposes?
Good idea. To be more precise:
- if the writer form is something else than (FUNCALL #'(SETF FOO) ...)
then there is a defsetf going on (it even takes precedence over a
potential setf function).
- if the writer form is (FUNCALL #'(SETF FOO) ...) and that function is
bound, then there is a setf function going on but no defsetf.
- otherwise, there is no writer at all.
I think this might just work.
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