Question

often I encounter hacks like

//lets say this is some class that still doesnt support...
//...all the functionality that it should based on the design docs
void MyClass::MyFunction()
{
  throw std::exception("not implemented");
}

I guess this is a bad practice, but that aside:
Is there a way to do the same thing during compilation, but only if the function is used (aka if it is unused compile should succeed).

Edit: Im also interested in virtual mem functions.

Answer 1

If it is non-virtual function then you can simply comment out the definition.

If it is a virtual function declared in a base class, then you can’t control the calls at compile time, so then your only option is some run-time error or exception.