To add to the above points, Inline functions can be overloaded but Macros
cannot be overloaded.

Ex:

#define MYMAC(p) if(p) cout << "single pointer valid" << endl;

#define MYMAC(p,h) if(h==1) cout << "pinter and H valid" << endl;

The second version replaces the macro. So a call to MYMAC(ptr) where ptr is
some pointer, you get warnings that not enough arguments for the macro which is
because the second version has replaced the MYMAC definition.