|| (or) equivalent in C/++ preprocessor directive?

Question

I want to use or in a preprocessor #ifdef directive. I've tried using the || operator but it hasn't worked. How can I do this?

score 4 · Answer 1 · answered Jul 19 '20 at 19:20

4

#if defined(SOMETHIG1) || defined(SOMETHING2)
/* .... */
#endif

answered Jul 19 '20 at 19:20

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score 1 · Answer 2 · answered Jul 19 '20 at 19:22

1

You can't.

#ifdef COND is short for #if defined(COND). It has no way to combine conditions.

But, you don't need to use #ifdef! If you write it out in full, you can make use of all the operators you need:

#if defined(COND1) || defined(COND2)

answered Jul 19 '20 at 19:22

2 Answers2