// frnd2tmp.cpp -- ÅÛÇø´ÀÌ ¾Æ´Ñ ÇÁ·»µå¸¦ °¡Áö´Â ÅÛÇø´ Ŭ·¡½º
#include <iostream>
using std::cout;
using std::endl;

template <typename T>
class HasFriend
{
private:
	T item;
	static int ct;
public:
	HasFriend(const T & i) : item(i) { ct++; }
	~HasFriend() { ct--; }
//	friend void counts();
	friend void report(HasFriend<T> &);	// ÅÛÇø´ ¸Å°³º¯¼ö
};

// °¢ Ư¼öÈ­´Â ÀڽŸ¸ÀÇ static µ¥ÀÌÅÍ ¸â¹ö¸¦ °¡Áø´Ù
template <typename T>
int HasFriend<T>::ct = 0;

// ¸ðµç HasFriend<T> Ŭ·¡½º¿¡ ´ëÇØ ÅÛÇø´ÀÌ ¾Æ´Ñ ÇÁ·»µå
void counts()
{
	cout << "int Ä«¿îÆ®: " << HasFriend<int>::ct << "; ";
	cout << "double Ä«¿îÆ®: " << HasFriend<double>::ct << endl;
}

// HasFriend<int> Ŭ·¡½º¿¡ ´ëÇØ ÅÛÇø´ÀÌ ¾Æ´Ñ ÇÁ·»µå
void report(HasFriend<int> & hf)
{
	cout <<"HasFriend<int>: " << hf.item << endl;
}

// HasFriend<double> Ŭ·¡½º¿¡ ´ëÇØ ÅÛÇø´ÀÌ ¾Æ´Ñ ÇÁ·»µå
void report(HasFriend<double> & hf)
{
	cout <<"HasFriend<double>: " << hf.item << endl;
}

int main()
{
	cout << "¼±¾ðµÈ °´Ã¼ ¾øÀ½: ";
	counts();
	HasFriend<int> hfi1(10);
	cout << "hfi1 ¼±¾ð ÈÄ: ";
	counts();
	HasFriend<int> hfi2(20);
	cout << "hfi2 ¼±¾ð ÈÄ: ";
	counts();
	HasFriend<double> hfdb(10.5);
	cout << "hfdb ¼±¾ð ÈÄ: ";
	counts();
	report(hfi1);
	report(hfi2);
	report(hfdb);

	return 0;
}