How to add a 'or' condition in #ifdef

Question

How can I add a \'or\' condition in #ifdef ?

I have tried:

#ifdef CONDITION1 || CONDITION2

#endif

Answer 1

May use this-

#if defined CONDITION1 || defined CONDITION2
//your code here
#endif

This also does the same-

#if defined(CONDITION1) || defined(CONDITION2)
//your code here
#endif

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Further-

• AND: #if defined CONDITION1 && defined CONDITION2
• XOR: #if defined CONDITION1 ^ defined CONDITION2
• AND NOT: #if defined CONDITION1 && !defined CONDITION2