Question

In our legacy code, as well as our modern code, we use macros to perform nifty solutions like code generations, etc. And we make use of both the # and ## operators.

I am curious how other developers use macros to do cool things, if they use them at all.

Answer 1

In C, it’s common to define macros that do some stuff getting the verbatim argument, and at the same time define functions to be able to get the address of it transparently.

// could evaluate at compile time if __builtin_sin gets // special treatment by the compiler #define sin(x) __builtin_sin(x)  // parentheses avoid substitution by the macro double (sin)(double arg) {     return sin(arg); // uses the macro }  int main() {     // uses the macro     printf('%f\n', sin(3.14));      // uses the function     double (*x)(double) = &sin;      // uses the function     printf('%f\n', (sin)(3.14)); }