C++ overloading clearly advocates simplicity in usage and readability. That is why all forms of operators are getting overloaded to give natural and domain oriented meanings. 
   The increment operator ++ can be called in two forms post fix and pre fix. The programmers will have a slight difficulty in overloading/using it because, they won't know how to differentiate them. That is why postfix operators are created with a dummy parameter of type int. 
   The prefix ++ operator can be overloaded as such, without any change. Look at the function/operator definition.

   Class Test 
   {
       int i;
     public:
       void operator ++() 
       { 
            ++i;
       }
    };

   The post fix ++ operator will be overloaded with a dummy integer parameter as follows. 
   Class Test 
   {
      int i;
    public:
      void operator ++(int)
      {
          i++;
      }
    };

   Similar method of overloading is used for the -- post/prefix operators also. 
   The stream operators << and << need a different type of treatment. Though these kind of techniques make the life of the developer difficult, it is the user who is going to be benefited the most.