问题描述
请解释该类，这是Mona的Jonathan Wood的视频"How Do I ...".我对代码不太清楚的地方做了一些评论.这是主应用程序头文件.我试图了解文档/视图体系结构，以及它们如何结合在一起.
Please explain this class, this is from MSDNs "How Do I..." video by Jonathan Wood. I made a couple of comments where the code isn''t quite clear to me. This is the main app header file. I''m trying to understand the Document/View architecture, how it all comes together.
class CContact : public CObject
{
public:
DECLARE_SERIAL(CContact)
CContact() {} <------- What's this?
CString m_sName;
CString m_sAddress;
CString m_sPhone;
CString m_sEmail;
CString m_sCity;
CString m_sState;
CString m_sZip;
void Serialize(CArchive& archive); <--------- Function declaration? Right?
CContact& operator=(const CContact& contact) <--- What does the rest of this do?
{
m_sName = contact.m_sName;
m_sAddress = contact.m_sAddress;
m_sPhone = contact.m_sPhone;
m_sEmail = contact.m_sEmail;
m_sCity = contact.m_sCity;
m_sState = contact.m_sState;
m_sZip = contact.m_sZip;
return *this;
}
};推荐答案
CContact() {} <------- What's this?
CContact的默认构造函数.创建不带任何参数的CContact实例时将调用它.
Default constructor of CContact. It will be called when you create an instance of CContact without any parameters.
CContact localInstance;// Here defaul constructor will be called.
2.
2.
void Serialize(CArchive& archive); <--------- Function declaration? Right?
是的. Serialize()的定义可以在该类的cpp文件中.
3.
Yes. Definition of Serialize() may be in cpp file of the class.
3.
CContact& operator=(const CContact& contact) <--- What does the rest of this do?
=运算符CContact重载.当一个CContact实例分配给另一个CContact实例时，将调用此方法.如果未创建相同的编译器，则编译器将创建默认的= operator实现.但是在某些情况下，我们必须创建自己的= operator实现.如果有任何成员指向存储位置的指针，则我们必须为新的CContact实例准备单独的指针副本.
= operator overloaded of CContact. This will be called when a CContact instance assigned to another CContact instance. Compiler will create a default =operator implementation, if we are not created the same. But we have to create our own =operator implementation in certain situations. If any member is pointer to a memory location, then we have to prepare separate copy of the pointer for the new instance of CContact.
CContact contactA;
//Assign member values to contactA.
....
....
CContact contactB; // Another CContact is created, Default constructor will be called.
// Here copying contactA to contactB, Here =operator will be called.
contactB = contactA; // Here =operator will be called.
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