//  ( c13.C )
//      仮想関数：仮想関数の機能を使う
//  

#include <iostream.h>   

class Base {   
protected:
    int color ;
public:
    virtual void show_color() {} ;
//  virtual void show_color() = 0 ; これでも、この場合構わない
} ;             


class Point1: public Base {     
public:            
    Point1(void) { color = 1 ; } 
    void show_color() { cout << "Point1 Color = " << color << endl ; }
} ;

class Point2: public Base {     
public:            
    Point2() { color = 2 ; } 
    void show_color() { cout << "Point2 Color = " << color << endl ; }
} ;


main()
{                                   
    Base* List1[3] ;

    Point1* p1 = new Point1() ; List1[0] = p1 ;   
    Point2* p2 = new Point2() ; List1[1] = p2 ;   
    List1[2] = NULL ;

    for ( int i=0;List1[i] != NULL;i++ ) {                 
        List1[i]->show_color() ;            // ここがすっきりした
    }

    delete p1 ; 
    delete p2 ;
}