C / C++ / MFC

followait wrote:

No difference between the two derived classes below?

followait wrote:

I've tried, both can destruct.

D::~D()

#include <iostream>
#include <assert.h>

using namespace std;

class B
{
public:
	B(){v();}
	virtual ~B() {
		assert(false);
		int j=0;
		++j;
	}
	virtual void v(){cout<<"B"<<endl;}
private:
};

class D : public B
{
public:
	D(){v();}
protected:
	~D() {
		assert(false);
		int i=0;
		++i;
	};
	virtual void v(){cout<<"D"<<endl;}
private:
};

int main()
{
	B *p=new D;
	delete p;

	return 0;
}

#include <iostream>
#include <assert.h>

using namespace std;

class B
{
public:
	B(){v();}
//protected: LINE REMOVED
	virtual ~B() {
    cout<<"~B"<<endl;
	}
	virtual void v(){cout<<"B"<<endl;}
private:
};

class D : public B
{
public:
	D(){v();}
protected:
	~D() {
    cout<<"~D"<<endl;
	};
	virtual void v(){cout<<"D"<<endl;}
private:
};

int main()
{
	B *p=new D;
	delete p;

	return 0;
}

B
D
~D
B

D d;

B b;

followait wrote:

protected: virtual ~D(){}

D objD;

D objD;

D *p=new D();
delete p;

B *p=new D();
delete p;

Nitheesh George wrote:

Any one know which message Windows sent to Explorer windows indicating a new file is created so that it must refresh and indicate the new changes in the Explorer window.

dehseth wrote:

class CMain;

#include "CChild.h"
#include "CMain.h"


then it gives me use of undefined type CMain at the line which I call a function of CMain from CChild class.

//FILE: B.h
class A;
class B 
{
  A * _pA;

  B(pA){_pA=pA;}
  void DoSomethingWithA();
};
//////////////////////////////////
//FILE B.cpp
void B::DoSomethingWithA()
{
  _pA->DoSomething();
}