C / C++ / MFC

Randor wrote:

task manager uses two methods of terminating an application depending on which tab is selected.

bool GetNextComb( std::vector<unsigned int> &vi );

egerving wrote:

Anyone know what the problem is here?

#if defined _UNICODE || defined UNICODE
	typedef std::wstring TMyString;
#else
	typedef std::string TMyString;
#endif

std::wstring transType=L"MU";

size_t n = fwrite(s.c_str(), sizeof(wchar_t), s.size(), f);

class B
{
public:
   virtual B & myFunc () { return *this; }
   virtual void SayMyName () { printf ("B"); }
};

class C : public B
{
public:
   virtual B &myFunc () { return *this; }
   virtual void SayMyName () { printf ("C"); }
}

main ()
{
   C c;
   B b = c.myFunc;
   b.SayMyName (); // prints B
}

class B
{
public:
   virtual B *myFunc () { return this; }
   virtual void SayMyName () { printf ("B"); }
};

class C : public B
{
public:
   virtual B *myFunc () { return this; }
   virtual void SayMyName () { printf ("B"); }
}

main ()
{
   C c;
   B *b = c.myFunc;
   b->SayMyName (); // prints C
}

#include < iostream >
using namespace std;

class B
{
protected:
	int b;
public:
	B(int b){this->b = b;}
	virtual void out(){cout << "hi frm B, data value is " << b << endl;}
};

class D1 : public  B
{
public:
	D1(int i):B(i){}
	virtual void out(){cout << "hi frm D1, data value is " << b << endl;}
};

class D2 : public B
{
public:
	D2(int i):B(i){}
	virtual void out(){cout << "hi frm D2, data value is " << b << endl;}
};

B * myFunc(int i)
{
	switch (i%3)
	{
	case 0:
		return new B(i);
	case 1:
		return new D1(i);
	case 2:
		return new D2(i);
	}
}

void main()
{
	B * p, *q;
	p= myFunc(5);
	q= myFunc(6);
	p->out();
	q->out();
}