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Asked: 2026-05-14T05:41:55+00:00

I have a macro definition in header file like this: // header.h ARRAY_SZ(a) =

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I have a macro definition in header file like this:

// header.h
ARRAY_SZ(a) = ((int) sizeof(a)/sizeof(a[0]));

This is defined in some header file, which includes some more header files.

Now, i need to use this macro in some source file that has no other reason to include header.h or any other header files included in header.h, so should i redefine the macro in my source file or simply include the header file header.h.

Will the latter approach affect the code size/compile time (I think yes), or runtime (i think no)?

Your advice on this!

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1 Answer

  1. Editorial Team

    Include the header file or break it out into a smaller unit and include that in the original header and in your code.

    As for code size, unless your headers do something incredibly ill-advised, like declaring variables or defining functions, they should not affect the memory footprint much, if at all. They will affect your compile time to a certain degree as well as polluting your name space.

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