ex1504.cpp

teach yourself C++ in 21 days 第五版

   // Ex1504.cpp
   #include <iostream>
   using namespace std;
   class myClass
   {
     public:
       myClass();
       ~myClass();
       void ShowMember();
       static int GetStatic();
     private:
       int itsMember;
       static int itsStatic;
  };
       
  myClass::myClass():
    itsMember(1)
  {
     itsStatic++;
  }
        
  myClass::~myClass()
  {
     itsStatic--;
     cout << "In destructor. ItsStatic: " << itsStatic << endl;
  }
         
  void myClass::ShowMember()
  {
     cout << "itsMember: " << itsMember << endl;
  }
          
  int myClass::itsStatic = 0;
           
  int myClass::GetStatic()
  {
     return itsStatic;
  }
            
  int main()
  {
     void (myClass::*PMF) ();
             
     PMF=myClass::ShowMember;
              
     myClass obj1;
     (obj1.*PMF)();
     cout << "Static: " << myClass::GetStatic() << endl;
              
     myClass obj2;
     (obj2.*PMF)();
     cout << "Static: " << myClass::GetStatic() << endl;
               
     myClass obj3;
     (obj3.*PMF)();
     cout << "Static: " << myClass::GetStatic() << endl;
     return 0;
  }