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What is the purpose of using #ifdef and #if in C++? 2 #ifdef means if defined If the symbol following #ifdef is defined, either using #define in prior source code or using a compiler command-line argument, the text up to the enclosing #endif is included by the preprocessor and therefore compiled #if works similarly, but it evaluates the boolean expression following it
Boolean in ifdef: is #ifdef A B the same as #if defined(A . . . This answer, while technically correct, doesn't accurately answer the question, and implies an incorrect usage While the two blocks will do the same thing, nesting two ifs is not the same as using Other conditions, such as an #else, could cause a problem Only the first option actually means exactly what the asker asked for
How to add a or condition in #ifdef - Stack Overflow This doesn't really answer the question "How to add a 'or' condition in #ifdef?" Please avoid code only answers, especially if you try to address the question indirectly
c++ - #if vs #ifndef vs #ifdef - Stack Overflow My problem is first of all, understanding #ifndef and #ifdef I also want to understand the difference between #if, #ifndef , and #ifdef I understand that #if is basically an if statement For exa
How can I use else if with the preprocessor #ifdef? In my project, the program can do one thing of two, but never both, so I decided that the best I can do for one class is to define it depending of a #define preprocessor variable The following cod