C / C++ / MFC

The default implementation of this function checks for
a NULL window class name and substitutes an appropriate
default. Override this member function to modify the
CREATESTRUCT structure before the window is created. 

By design, these derivations of PreCreateWindow are 
 not documented

int operator()(int i1, int i2)
{
  return /* whatever */;
}

class multiplier
{
public:
    int operator()(int i)    { return i * 3; }
};

multiplier mul;
cout << mul(10);    // should return 30