countof() overload resolution tricks

• Function calls can detect class hierarchies

• • Overload resolution is based on parameter types (with conversions applied!)

• Different overloads of a function can return different data types:

• • int sqrt(int);
  • double sqrt(double);

• User directed overload resolution: Passing a function call as a parameter to a function lets you compute an overload for the calling function by the parameter to the called function