#include<iostream>

using namespace std;

class CxFactory;

class Cx
{
	friend CxFactory;

	public:
		void Show();
		void Increment();
	private:
		Cx();
		
		// data members
		int m_x;

};

class CxFactory
{
	public:
		static Cx& Instance();
	private:
		CxFactory();
		static Cx m_Cx;
};

Cx CxFactory::m_Cx;

Cx::Cx()
{
	m_x = 0;
}

void Cx::Show()
{
	cout << "Cx m_x = " << m_x << endl;
}

void Cx::Increment()
{
	m_x++;
}

Cx& CxFactory::Instance()
{
	return m_Cx;
}

CxFactory::CxFactory(){}


void main()
{
	Cx& x1 = CxFactory::Instance();

	x1.Show();
	x1.Increment();
	x1.Show();

	Cx& x2 = CxFactory::Instance();

	x2.Increment();
	x2.Show();
	x1.Show();

}