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Forum => newLISP in the real world => Topic started by: denis on March 13, 2012, 04:32:36 AM

Title: "double symbol"
Post by: denis on March 13, 2012, 04:32:36 AM
Hi! Maybe a simple question, but why double symbol is not detected as symbol?


Code Select

(symbol? ''a) ; -> nil
; but
(symbol? (eval ''a)) ; -> true


What type of object is ''a (or e.g. '''''''''''''''''''''a) then?
Title: Re: "double symbol"
Post by: cormullion on March 13, 2012, 01:00:54 PM
Probably a quoted expression.


Code Select
> (quote? ''a)
true
> (quote? 'a)
nil

Don't know for sure, though.
Title: Re: "double symbol"
Post by: denis on March 14, 2012, 04:57:52 AM
Oh, true. Thanks, cormullion!

Needed this to analyze what macroses get in the (args). Complex cases happen when macro calls another macro. Maybe I go in wrong way, but for the moment current the question how to detect the form (type) of argument is relevant :-)
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