comments in c macro definition

Question

There is not much information about this. Is this the one and only way to do comment in C macro definition? Or can I make add comment using another way?

#define TEST(a, b) \
{ \
    bool aGb = false;\
    bool bGc = false;\
    /* comment is here */ \
    if (a > b) \
    {\
        ... \
    }\
}

http://stackoverflow.com/questions/1510869/does-the-c-preprocessor-strip-comments-or-expand-macros-first — Arkadiusz Drabczyk, May 08 '15 at 22:22

score 2 · Answer 1 · 2015-05-08T22:35:58.773

You can do this:

#define DOC(ignored)

And combine like so:

#define TEST(a, b) \
{ \
    bool aGb = false; \
    bool bGc = false; \
    DOC((This is a comment, hello world!)) \
    if (a > b) \
    { \
        ... \
    } \
}

Naturally you can't use the C99 comment style with //, since it would ignore the rest of the line and prevent you from creating a multi-line macro.

I would personally suggest just getting used to /* comment */ style. For a start, people using syntax-highlighting IDEs with your code won't see the highlighting if you use this DOC macro above.

score 1 · Answer 2 · answered May 09 '15 at 06:10

1

The only limitation which adds to those already present when commenting "real" C sources is, that you may not add anything on a macro's "source" line after the final backslash.

answered May 09 '15 at 06:10

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comments in c macro definition

2 Answers2