虚函数占用内存

最新推荐文章于 2022-09-25 12:09:35 发布

原创最新推荐文章于 2022-09-25 12:09:35 发布 · 799 阅读

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#include<iostream>
using namespace std;
class S
{
};
class A:public S
{
public:
	virtual void Func()
	{
		cout<<"this is A func"<<endl;
	}
};
class B:public A
{
public:
	virtual void Func()
	{
		cout<<"this is B func"<<endl;
	}
	void SubFunc()
	{
		Func();
	}
};
class C:public A
{
public:
	void Func(){cout<<"this is C func"<<endl;}
	void SubFunc(){Func();}
};
int main()
{
	A* pa=new A();
	A* pb=new B();
	A* pc=new C();
	pa->Func();
	pb->Func();
	pc->Func();
	((B*)pb)->SubFunc();
	((C*)pc)->SubFunc();
	int a=sizeof(A);
	int b=sizeof(B);
	int c=sizeof(C);
	cout<<a<<" "<<b<<" "<<c<<endl;
	return 0;
}