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How to add a 'or' condition in #ifdef

Tags:

c++

c

c-preprocessor

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#if defined(CONDITION1) || defined(CONDITION2)

should work. :)

#ifdef is a bit less typing, but doesn't work well with more complex conditions


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

Further-

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

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