Biegral Blog

       在Java里，没有多重继承，在C++里面有，但是，在用的时候，要小心。先看一个错误程序：

#include <iostream>
using namespace std;

class Father
{
public:
	void claim()
	{
		cout << "Father is good!" << endl;
	}
};

class Mother
{
public:
	void claim()
	{
		cout << "Mother is good!" << endl;
	}
};

class Child : public Father, public Mother
{
};

int main()
{
	Child c;
	c.claim(); // 二义性

	return 0;
}

#include <iostream>
using namespace std;

class Father
{
public:
	void claim()
	{
		cout << "Father is good!" << endl;
	}
};

class Mother
{
public:
	void claim()
	{
		cout << "Mother is good!" << endl;
	}
};

class Child : public Father, public Mother
{
};

int main()
{
	Child c;
	c.Father::claim();
	c.Mother::claim();

	return 0;
}

       另外，在菱形继承时，也会出现类似问题，解决方式是采用虚继承。