Suppress Compiler warning Function declared never referenced

Question

So i have some code like this:

void foo (int, int);

void bar ( )
{
    //Do Stuff

   #if (IMPORTANT == 1)
       foo (1, 2);
   #endif

}

Answer 1

In C++17 you can declare your function with [[maybe_unused]]:

[[maybe_unused]] void foo (int, int);

This will suppress the warning and is the correct, idiomatic way to express a possibly unused function in C++17.