C++多继承中的虚继承

多重继承与虚拟继承解析

最新推荐文章于 2024-12-02 23:57:07 发布

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// ConsoleApplication7.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//

#include <iostream>


class A
{
public :
    A() { A::count++; };
    static int count;
    void method()
    {
        std::cout << "from A class :"<<A::count << std::endl;
    }
};

int  A::count = 0;


class B :public A
{};
class C : public A
{};

class D :public B, public C
{


};

 
int main()
{
    D d;
    d.A::method();// this is 2, the A class is intanced twice
}

// ConsoleApplication7.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//

#include <iostream>


class A
{
public :
    A() { A::count++; };
    static int count;
    void method()
    {
        std::cout << "from A class :"<<A::count << std::endl;
    }
};

int  A::count = 0;


class B :public virtual A
{};
class C : public virtual A
{};

class D :public B, public C
{


};

 
int main()
{
    D d;
    d.A::method();// this is 1, the A class is intanced once
}