C++里面virtual函数及虚表大小

#include <vector>
#include <iostream>

using namespace std;

class A {
public:


    virtual int a(){}
    virtual int b(){}
    virtual int c(){}
    virtual int d(){}
    virtual int e(){}
    virtual int f(){}
    virtual int g(){}

    int t;
};

int main() {

    A a;
    cout << sizeof(a) << endl;


    return 0;
}