C++Talk.NET

CFF · Guest

I am working on a VC6++ project that involve an object to be initialised
by a 'this' pointer pointing to another object. I encountered, however,
a syntax error. I wonder if someone can help. See the code below. What I
couldn't figure out is it is OK with

CMyClassA B2(this);

in fileB.cpp but a SYNTAX ERROR with

CMyClassA m_B2(this);

in fileB.h. What should I do in order to create a initialised object of
CMyClassA if I really need a class member variable (m_B2) rather than a local (B2)?

Thanks for any help.

/////////////////////////// fileA.h ///////////////////////////
//
// forward declaration
class CMyClassB;

// CMyClassA declaration
class CMyClassA{
public:
CMyClassB* m_ptA;

public:
CMyClassA();
CMyClassA(CMyClassB* ptB);
};

/////////////////////////// fileA.cpp /////////////////////////
//
#include "fileA.h"

// constructor 1
CMyClassA::CMyClassA(void){
// ... whatever ...
}

// constructor 2
CMyClassA::CMyClassA(CMyClassB* ptB){
m_ptA = ptB;
}

/////////////////////////// fileB.h ///////////////////////////
//
#include "fileA.h"

class CMyClassB{
public:
CMyClassA m_B1; // no problem
CMyClassA m_B2(this); // syntax error : 'this', WHY???

public:
CMyClassB(void);
};

/////////////////////////// fileB.cpp //////////////////////////

#include "fileB.h"

CMyClassB::CMyClassB(void){
CMyClassA B1; // no problem
CMyClassA B2(this); // no problem
}

int main(void){
// ... whatever ...
return 1;
}

kamil · Guest

Try this

Karl Heinz Buchegger · Guest

CFF wrote:

Karl Heinz Buchegger · Guest

Karl Heinz Buchegger wrote:

CFF · Guest

"kamil" <kamildobk (AT) xxxpoczta (DOT) onet.pl> wrote

Michael Chisholm · Guest

I think as long as you don't try to manipulate the half-constructed
object, you're fine. I believe I do this very thing in some piece of
software I wrote, and I have seen no ill effects. The compiler is just
reminding you... you can always disable the warning with a #pragma.

CFF wrote: