KwCheng's blog

Classes can contain data and functions. These functions are referred to as "member functions."

Any nonstatic function declared inside a class declaration is considered a member function and is called using the member-selection operators (. and –>). 

When calling member functions from other member functions of the same class, the object and member-selection operator can be omitted. 

(member function間的呼叫 ,  可以不用透過member-selection operators .)

#include <iostream>
using namespace std;

class Point
{
public:
   short x()
   {
      return _x;
   }
   
   short y()
   {
      return _y;
   }

   void  Show()
   {
      cout << x() << ", " << y() << "\n";
   }
private:
   short _x, _y;
};

int main()
{
   Point pt;
   pt.Show();
}

These calls implicitly mean this->x() and this->y() .

ref : http://msdn.microsoft.com/zh-tw/library/fk812w4w.aspx