Someone please explain this class

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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.

C++

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;
	}
};

Posted 24-Oct-12 13:57pm

DrBones69

Updated 24-Oct-12 15:13pm

v2

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Mohibur Rashid 24-Oct-12 20:40pm

Did you learn c++ at all? if you didn't its pointless asking these question in forum. cause in few lines this cant be explained that would make sense to you

DrBones69 24-Oct-12 21:08pm

Yes, but I'm a bit rusty. I've been writing in RM/COBOL for the last 17 years and this OOP stuff is a bit tricky. I'm trying to understand the Document/View architecture. This is just a piece of the puzzle I'm trying to put together.

chaau 24-Oct-12 21:19pm

Looks like trolling to me.

DrBones69 24-Oct-12 21:23pm

Really? Andrew Really?

Sergey Alexandrovich Kryukov 24-Oct-12 22:13pm

Maybe, this is a joke, and I'm pretty much sure you're not trolling, but...

If I wanted to troll, I would probably chose some style like this one and enjoyed to see how experts will go out of awkward position. I don't want to get caught by this, even if this is not trolling.

Imagine something tells the joke, all are laughing, but one is asking to explain the humor. Trolling or not, but the one who catch the lure and try to explain the humor would be in awkward position. Some requests should be denied as inadequate. And I'm not afraid of making you harm, because an attempt to "explain a class" cannot help you anyway. I tried to explain why, below.
--SA

Sergey Alexandrovich Kryukov 24-Oct-12 22:08pm

Absolutely agree. Below, I tried to explain why the "question" is incorrect. Anyway, very ineffective way to learn things.
--SA

Sergey Alexandrovich Kryukov 24-Oct-12 22:06pm

Incorrect, as a question. How would you define "explaining of a class"? Explain what, exactly? You did not ask any questions. Ask about something you right by yourself, otherwise your method of learning is very ineffective. Ask Jonathan Wood, after all.
--SA

DrBones69 26-Oct-12 20:10pm

I did, in fact, ask 4 questions. I thought this site was a learning tool, I guess I'm wrong. Majority of users only want to criticize others inadequate understanding of something they're trying to learn. I know you were not born with the knowledge that you may have now, so why are you not willing to share? Are you afraid that someone might become better than you? I'm not trying to mislead or 'troll' anyone. I've read article after article on MSDN trying to grasp somethimg that has alluded me. At first, I thought MFC was great concept, now I'm second guessing.

Sergey Alexandrovich Kryukov 26-Oct-12 21:06pm

It is, among other thing, is a learning tool, but for those who really want to put considerable effort. We already helped many people, judging by the feedback. Look at the accepted answers.

How do you know what other members really want? You should understand that criticism is one of the major cornerstones of learning. Everyone can see, that if I do something wrong and other members point it out, I either say "thank you" for helping me to improve myself and try hard to fix the problem, or I stand for my opinion arguably. Wining, complaining or playing offended card cannot help. After all, you need it, not the one who helps you (criticizing or not).

Everyone can see that I share a lot, often writing a whole article in response to a small question. If you cannot see it, it's your problem. If it was done not in response to your question, this is also your problem. I can explain. Look at your "question" on this page. This is not a question at all. Besides, you are trying to take non-productive approach. You ignore my question which were supposed to help you to fix the question to make some sense of it. "Explaining a class" -- are you going to define the meaning of it? I don't think so, and I think your request is, again, non-productive.

You should better try to write your own code and ask when you face problems. So many members do that and get essential help; and the feedback is so positive.

Now, I already told you that I personally never though you are actually a troll and not sure if Andrew Cherednik was serious about it. I explained it in my post above. You really should think about your own work and study, and only this can change the situation with getting some help from other members.

Wish you the best of luck,
--SA

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Santhosh G_ · Answer 1 · 2012-10-24T14:49:00

1.

C++

CContact() {}   <------- What's this?

Default constructor of CContact. It will be called when you create an instance of CContact without any parameters.

C++

CContact localInstance;// Here defaul constructor will be called.

2.

C++

void Serialize(CArchive& archive);  <--------- Function declaration? Right?

Yes. Definition of Serialize() may be in cpp file of the class.

3.

C++

CContact& operator=(const CContact& contact) <--- What does the rest of this do?

= 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.

C++

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.

tyyuanzhenhua · Answer 2 · 2012-10-25T20:18:00

for the
1. CContact(){}:replace it as the default constructor
2. void Serialize(CArchive& archive):the Serialize function is a complex function about storage the data or output the data
3. CContact& operator=(const CContact& contact):is the copy the parameter(also the object) to the object

Someone please explain this class

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