I am confused with these concepts.

rockdale <rockdale.green@gmail.com>
Sat, 26 Jan 2008 18:50:48 -0800 (PST)
Hi, all:

This may be a silly question. But I just do not get it.

Why sometime we need to new a class to call its functions or to get it
public properties. But sometime we just simply declare it and then we
can access its funnctions and properties?

Also, sometime, I need to pur Class myClassName at the top of another
class to compile, but sometime I do not need?

I guess give an example may explain myself more clear.

I have an sample class to represent my members (id and name, to

typedef struct {
    int ID;
    std::string Name;
} MembData;

typedef std::vector<MembData> MembVec;
typedef MembVec::iterator MembItr;

class CMembDataClass
    void Load(); //populate memb's data list into m_vecMemb
    bool Remove(MembData aData);
    bool Append(MembData aData);
    bool Update(MembData aData);

    MembVec m_vecMemb;

I have another class to use this MembDataClass, let call it

I always thought I need to new the MembDataClass (instantialize it to
get the public variable m_vecMemb) :

include "MembDataClass.h"
MembVec m_membList;

CMembDataClass* pMyMemb = new CMembDataClass();
m_membList = pMyMemb->m_vecMemb;

But I also tried:

CMembDataClass myMemb;
m_membList = myMemb.m_vecMemb;

I thought it would give me error like access violation something, but
it works.
in this case: I need to put class CMembDataClass; in CMyDisctionary.h

and if I did not call new to instantialize the MembDataClass, where is
the data stored at?

is it because my MembData is struct, if it is another class, would it
be a different behavior? and what is the case if m_vecMemb is a

thanks in advance\

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