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Groups > comp.lang.c > #11054

Re: macro with the same name in translation unit

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James Kuyper <jameskuyper@verizon.net> writes:
[...]
> The following two alternatives don't violate that constraint, and have
> behavior corresponding to the two "obvious ways" I mentioned above:
>
> Option 1:
> #ifdef DUMMY
> #undef DUMMY
> #endif
> #define DUMMY 200
>
> Option 2:
> #ifndef DUMMY
> #define DUMMY 200
> #endif

Option 3:

#undef DUMMY
#define DUMMY 200

#undef does nothing if the macro isn't currently defined (though I
suppose some compilers might issue a warning).

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

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macro with the same name in translation unit "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2011-09-28 10:53 -0400
  Re: macro with the same name in translation unit James Kuyper <jameskuyper@verizon.net> - 2011-09-28 11:41 -0400
    Re: macro with the same name in translation unit Keith Thompson <kst-u@mib.org> - 2011-09-28 09:22 -0700
      Re: macro with the same name in translation unit James Kuyper <jameskuyper@verizon.net> - 2011-09-28 13:16 -0400
        Re: macro with the same name in translation unit Keith Thompson <kst-u@mib.org> - 2011-09-28 13:42 -0700
          Re: macro with the same name in translation unit James Kuyper <jameskuyper@verizon.net> - 2011-09-28 17:18 -0400

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