派生表中第一个基类没有虚函数，派生类存在虚函数时的内存布局

#include <iostream>

using namespace std;

class A
{
public:
    A()
    {
        a = 1;
        ch = ‘a‘; //ASCII码97
    }
private:
    int a;
    char ch;
};

class C : public A
{
public:
    C()
    {
        c = 3;
    }
    virtual void print()
    {
        cout << "C" << endl;
    }
private:
    int c;
};

int main()
{
    C c;
    int *p = (int *)&c;
    for (int i = 0; i < 4; i++)
    {
        cout << p[i] << endl;
    }
    //C的内存布局：
    //vptr
    //a
    //ch后面填充了3个字节
    //c

    return 0;
}