?? multipleinheritance2.cpp
字號:
//: C22:MultipleInheritance2.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Virtual base classes
#include "../purge.h"
#include <iostream>
#include <vector>
using namespace std;
class MBase {
public:
virtual char* vf() const = 0;
virtual ~MBase() {}
};
class D1 : virtual public MBase {
public:
char* vf() const { return "D1"; }
};
class D2 : virtual public MBase {
public:
char* vf() const { return "D2"; }
};
// MUST explicitly disambiguate vf():
class MI : public D1, public D2 {
public:
char* vf() const { return D1::vf();}
};
int main() {
vector<MBase*> b;
b.push_back(new D1);
b.push_back(new D2);
b.push_back(new MI); // OK
for(int i = 0; i < b.size(); i++)
cout << b[i]->vf() << endl;
purge(b);
} ///:~
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