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Posted By

jimfred on 12/03/08


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c operator concatenation


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sergeizen


C #define macro to generate a comment using concatenation operator in preprocessor

 / Published in: C
 

URL: http://www.keil.com/dd/docs/c51/cypress/fx2regs.h

This uses the concatenation operator "##" to insert a comment "//"

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  1. #define _AT_ ;/ ## /

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Posted By: pmkenny1234 on November 10, 2010

WARNING: We used this snippet to comment out some stream processing code in our application:

define FOO ;/ ## /

...

// somewhere in our code FOO

Posted By: pmkenny1234 on November 10, 2010

OK. It looks like I can neither edit my comment or delete it. Anyway, the point of the comment was that this code does NOT work on Linux or Mac. The // type of comment is a preprocessor directive and the preprocessor doesn't do multiple passes. We were commenting stream operators, so creating a dummy class with empty inlined stream operators and replacing the AT with those values worked fine and the compiler optimized out the useless code. Hope this helps someone.

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