C / C++ / MFC

class _A
{
public:
	_A()
	{
		m_this = this;
	};
	_A *m_this;
	void f()
	{
		printf("instance: %p\n",m_this);
	}
};

void main()
{
	_A a1,a2, *pa1,*pa2 ;

	a1.f();
	a2.f();
	pa1 = new _A();
	pa2 = new _A();
	pa1->f();
	pa2->f();
	delete pa1;
	delete pa2;
return;
}

class A {
public:
    A() {
        vf();
    }

    virtual void vf() {
        printf("A::vf() called\n");
    }
};

class B : public A {
public:
    virtual void vf() {
        printf("B::vf() called\n");
    }
};

void main ()
{
    A a;  // create an instance of class A
    B b;  // create an instance of class B
}

A::vf() called
A::vf() called

<br />
class CVariableManager;<br />
class CVariable()<br />
{<br />
private:<br />
   friend class CVariableManager;<br />
   CVariable( /* params go here */ );<br />
   ~CVariable();<br />
<br />
public:<br />
   // Other stuff here.<br />
};<br />
<br />
// Probably in another header file somewhere...<br />
class CVariableManager<br />
{<br />
public:<br />
   CVariableManager();<br />
   ~CVariableManager();<br />
  <br />
   CVariable * CreateVariable( /* params go here */ ); // Define this function to create a new variable, add it to the list, and return it.<br />
   void        DeleteVariable( CVariable * p_poVariable ); // Define this function to delete the given variable and remove it from the list.<br />
};<br />