c++中的虚函数表

#include 
#include 
#include 
#include 
#include 
//using namespace std;
using std::cout;
using std::endl;
using std::ends;
using std::flush;
using std::shared_ptr;
using std::make_shared;
using std::string;
using std::vector;
using std::nothrow;
using std::unitbuf;
using std::nounitbuf;
#define TEST

#if TEST1

class Base
{
public:
    virtual void function1() {};
    virtual void function2() {};
};

class D1: public Base
{
public:
    virtual void function1() {cout <<"d1 11"<
public:
    virtual void function2() {};
};


//int main()
//{
//    D1 d1;
//}


int main()
{
    D1 d1;
    Base* dPtr = &d1;
    dPtr->function1();
    return 0;
}
#else
class Base1
{
public:
	int i;
	virtual void print()
	{
		cout << "base::print";
	}
};

class Deriv:public Base1
{
public:
	//int n;
	virtual void print()
	{
		cout << "Deriv::print";
	}
};

int main()
{
	//Deriv d;
	cout << sizeof(Base1) << "," << sizeof(Deriv) << ","<