《笔记》孙鑫老师MFC第二讲（C++特性）

#include <iostream.h>

class CObject
{
public:
virtual void Serialize() { cout<<"CObject::Serialize()/n/n";}
};

class CDocument:public CObject
{
public:
void func()
{
cout<<"CDocument::func()"<<endl;
//     Serialize();//这句代码主要是为了实现虚拟函数的调用
}
void Serialize() { cout<<"CDocument::Serialize()/n/n";}
};

class CMyDoc:public CDocument
{
public:
void Serialize() { cout<<"CMyDoc::Serialize()/n/n";}
};

void main()
{
CMyDoc mydoc;
CMyDoc *pmydoc=new CMyDoc;

cout<<"#1 testing"<<endl;
mydoc.func();

cout<<"#2 testing"<<endl;
((CDocument *)(&mydoc))->func();

cout<<"#3 testing"<<endl;
pmydoc->func();

cout<<"#4 testing"<<endl;
((CDocument)mydoc).func();
}

运行结果1：（注释掉函数func里Serialize()的的情况）
#1 testing
CDocument::func()
#2 testing
CDocument::func()
#3 testing
CDocument::func()
#4 testing
CDocument::func()

运行结果2：（没注释的情况）
#1 testing
CDocument::func()
CMyDoc::Serialize()

#2 testing
CDocument::func()
CMyDoc::Serialize()

#3 testing
CDocument::func()
CMyDoc::Serialize()

#4 testing
CDocument::func()
CDocument::Serialize()