虚继承下的多重继承内存布局

最新推荐文章于 2024-04-07 18:25:33 发布

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最新推荐文章于 2024-04-07 18:25:33 发布

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分类专栏： C/C++ 文章标签： constructor class include system c fun

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#include <iostream>

class A
{
public:
    int a;
    A():a(10){ std::cout << "A constructor" << std::endl; }
    void f()
    {
        std::cout << "A::f" << std::endl;
    }
};

class B: virtual public A
{
public:
    int b;
    B():b(20){ std::cout << "B constructor" << std::endl; }
    void f()
    {
        std::cout << "B::f" << std::endl;
    }
};

class C: virtual public A
{
public:
    int c;
    C():c(30){ std::cout << "C constructor" << std::endl; }
    void f()
    {
        std::cout << "C::f" << std::endl;
    }
};

class D: public B , public C
{
public:
    int d;
    D():d(10){ std::cout << "D constructor" << std::endl; }
    void f()
    {
        std::cout << "D::f" << std::endl;
    }
};

typedef void(*Fun)(void);

int main()
{
    D* pd = new D;
    A* pa = pd;
    B* pb = pd;
    C* pc = pd;

    std::cout << "========================" << std::endl;
    std::cout << &pd->a << std::endl;
    std::cout << &pd->b << std::endl;
    std::cout << &pd->c << std::endl;
    std::cout << &pd->d << std::endl;
    std::cout << "========================" << std::endl;
    std::cout << pa << std::endl;
    std::cout << pb << std::endl;
    std::cout << pc << std::endl;
    std::cout << pd << std::endl;

    system("pause");
    return 0;
}