vitrual与类的大小

来源：互联网发布：炒股必备软件编辑：程序博客网时间：2024/06/05 19:08

#include <iostream>
using namespace std;
class my
{
};
class myfu:public my
{
};
void main()
{
   cout << sizeof(myfu) << endl;//1
   cin.get();
}

#include <iostream>
using namespace std;
class my
{
};
class myfu:virtual public my
{
};
void main()
{
   cout << sizeof(myfu) << endl;//4
   cin.get();
}

#include <iostream>
using namespace std;
class my
{
};
class myfu:virtual public my
{
};
class myfupo :virtual public myfu
{
};
void main()
{
   cout << sizeof(myfupo) << endl;//8
   cin.get();
}

#include <iostream>
using namespace std;
class my
{
};
class myfu:virtual public my
{
};
class myfupo :virtual public myfu
{
   virtual void go()
   {
   }
};
void main()
{
   cout << sizeof(myfupo) << endl;//12
   cin.get();
}

#include <iostream>
using namespace std;
class my
{
};
class myfu:virtual public my
{
};
class myfupo :virtual public myfu
{
   virtual void go() = 0;
};
void main()
{
   cout << sizeof(myfupo) << endl;//12
   cin.get();
}

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