C++ - 虚继承(virtual inheritance)

虚继承(virtual inheritance)

本文地址: http://blog.csdn.net/caroline_wendy/article/details/18089215

虚继承主要是避免基类重复被继承, 包含多个相同基类, 导致歧义性, 使用虚基类(virtual base class)继承, 可以使派生对象只包含一份基类文件.

如果不使用虚继承, 则派生类需要提供一份自己的示例版本, 

参见: http://blog.csdn.net/caroline_wendy/article/details/18077235

代码:

/*
 * cppprimer.cpp
 *
 *  Created on: 2014.1.10
 *      Author: Spike
 */

/*eclipse cdt, gcc 4.8.1*/

#include <iostream>
#include <string>

class ZooAnimal {
public:
	void zooprint (void) { std::cout << "Zoo Animal!" << std::endl; }
};

class Raccoon : public virtual ZooAnimal {
public:
	void raccprint (void) { std::cout << "Raccoon!" << std::endl; }
};

class Bear : public virtual ZooAnimal {
public:
	void bearprint (void) { std::cout << "Bear!" << std::endl; }
};

class Panda : public Bear, public Raccoon {
public:
	void pandprint (void) { std::cout << "Panda!" << std::endl; }
};

void dance (Bear& B) {
	B.bearprint();
}

void rummage (Raccoon& R) {
	R.raccprint();
}

int main (void)
{
	Panda P;
	P.zooprint();
	dance(P);
	rummage(P);
}
           

输出:

Zoo Animal!
Bear!
Raccoon!