demo_4_multiple_inheritance_ambiguity.cpp

来自「对于一个初涉VC＋＋的人来书」· C++ 代码 · 共 38 行

//**********************************************
// 多继承的名字冲突问题的二义性错误
//**********************************************

#include<iostream.h>

class Base1 //基类1
{
public:	
	void show() { cout<<i<<endl; }
protected:
	int i;
};

class Base2 //基类2
{
public:	
	void show() { cout<<j<<endl; }
protected:
	int j;
};

class Derived: public Base1,public Base2 //多继承的派生类
{
public: 
	Derived(int x,int y) { i=x; j=y; }
};

void main()
{
	Derived object(10,20);	//声明一个派生类的对象

//	object.show();  //Error: 'Derived::show' is ambiguous (二义性错误)
	                //Warning: could be the 'show' in base 'Base1' of class 'Derived'
                    //Warning: or the 'show' in base 'Base2' of class 'Derived'
	return;
}