Run C++ class functions in thread

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I want to make a thread which will call functions of a class.
I have changed the question with a simpler example to understand the problem:
[/code]

Suppose we have class rectangle

class CRectangle
{
  int x, y;
  public:
void set_values (int a,int b)
{
  x = a;
  y = b;
}

void get_values (int &a,int &b)
{
  a = x;
  b = y;
}

    int area () {return (x*y);}
};


int main ()
{
  int &x, &y;
  CRectangle rect;

  rect.set_values (3,4);

  rect.get_values (x,y);
  cout << "x = " << x << “y = ” << y;

  cout << "area: " << rect.area();

  return 0;
}

Here you see that we creating an object in main fn and depending on our need calling the various fns of the class.

Now I want to make this class threadable in the sense I want to the class fns to be executed in a thread.
So I wrote the following class:

class Thread
{
	Thread *threadptr;
	HANDLE    ThreadHandle;

	public:
		Thread()
		{
			Thread = 0;
		}

		void start()
		{
			DWORD threadID;

			threadptr = this;
			ThreadHandle = CreateThread(0, 0, entrypoint, threadptr, 0, &threadID);
		}

		void stop()
		{
			
		CloseHandle (ThreadHandle, 0);
		}

 		static unsigned long entrypoint(void* ptr)
		{
			((Thread*)ptr)->execute();
			return 0;
		}
		virtual void execute() = 0;
};

Usage of thread class:

class CRectangle: public Thread
{
  private:
    int x, y;
void set_values (int a,int b)
{
  x = a;
  y = b;
}

void get_values (int &a,int &b)
{
  a = x;
  b = y;
}

    int area () {return (x*y);}

	public:
		CRectangle () { }
		~ CRectangle () { }

		//the execute function, you need to override this one
		void execute()
{
//Add your threaded code here
}
	
};

int main()
{
	CRectangle obj;

	obj.start();
	obj.stop();

	return 0;
}

Now I want to know how to call ALL the various fns of class rectangle from within execute() in the same way as I called in main earlier.