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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
C ifdef, else, endif directives - Stack Overflow Additionally, with the directives if the condition after #ifdef becomes true then the compiler will compile the following code otherwise it would look for the next directive and compile the following code
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 - #define, #ifdef #undef #endif - Stack Overflow The ifdef condition is evaluated when the preprocessor gets to it When you undef PROC_ADD inside the ifdef 'd code, the preprocessor has already decided which section of code to include and which to ignore
Boolean in ifdef: is #ifdef A B the same as #if defined(A . . . Conditional Compilation You can use the defined operator in the #if directive to use expressions that evaluate to 0 or 1 within a preprocessor line This saves you from using nested preprocessing directives The parentheses around the identifier are optional For example: #if defined (MAX) ! defined (MIN) Without using the defined operator, you would have to include the following two
#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