fig22_18.cpp

《c＋＋大学教程》源码

// Fig. 22.18: fig22_18.cpp
// Driver for multiple inheritance example.
#include <iostream>

using std::cout;
using std::endl;

#include "base1.h"
#include "base2.h"
#include "derived.h"

int main()
{
   Base1 base1( 10 ), *base1Ptr = 0;  // create Base1 object
   Base2 base2( 'Z' ), *base2Ptr = 0; // create Base2 object
   Derived derived( 7, 'A', 3.5 );    // create Derived object

   // print data members of base-class objects
   cout << "Object base1 contains integer " 
        << base1.getData() 
        << "\nObject base2 contains character " 
        << base2.getData()
        << "\nObject derived contains:\n" << derived << "\n\n";

   // print data members of derived-class object
   // scope resolution operator resolves getData ambiguity
   cout << "Data members of Derived can be"
        << " accessed individually:"
        << "\n    Integer: " << derived.Base1::getData()
        << "\n  Character: " << derived.Base2::getData()
        << "\nReal number: " << derived.getReal() << "\n\n";

   cout << "Derived can be treated as an "
        << "object of either base class:\n";

   // treat Derived as a Base1 object
   base1Ptr = &derived;
   cout << "base1Ptr->getData() yields "
        << base1Ptr->getData() << '\n';

   // treat Derived as a Base2 object
   base2Ptr = &derived;
   cout << "base2Ptr->getData() yields "
        << base2Ptr->getData() << endl;

   return 0;

}  // end main

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