#include <iostream>

// overloading "operator () " outside class

//////////////////////////////////////////////////////////

class Rectangle

{

public:

	Rectangle(const int w, const int h)

		: width(w), height(h)

	{};

	~Rectangle() {};

	int& operator() (const size_t i);

public:

	int width;

	int height;

};

//////////////////////////////////////////////////////////

int &

Rectangle::operator()(const size_t i)

{

	if (i == 0)

		return width;

	else

		return height;

}

//////////////////////////////////////////////////////////

std::ostream&

operator<< (std::ostream& os, const Rectangle& rec)

{

	os << rec.width << ", " << rec.height;

	return  os;

}

//////////////////////////////////////////////////////////

int main()

{

	Rectangle a(40, 10);

	std::cout

		<< "w = " << a(0) << std::endl		// 输出 40

		<< "h = " << a(1) << std::endl		// 输出 10

		;

	return 0;

}