[C++] 类 sizeof

#include <iostream>
#include <memory>
#include <assert.h>

using namespace std;

class A{
 char k[3];
public:
 virtual void aa(){};
};

class B:public  A{
 char j[3];
public:
 virtual void bb(){};
};

class C:public B{
 char i[3];
public:
 virtual void cc(){};
};

int main(int argc,char *argv)
{
 cout<<"sizeof(A):"<<sizeof(A)<<endl;
 cout<<"sizeof(B):"<<sizeof(B)<<endl;
 cout<<"sizeof(C):"<<sizeof(C)<<endl;

 return 0;
}

 

结果为 8 12 16