#include <iostream>
#include <cstdlib>
using namespace std;

template <class T>
inline void f5();

template <class T>
class wrapper {
	const T t;
public:
	wrapper(const T& initial_t = T()): t(initial_t) {}

	friend void f1() {cout << "f1(): " << sizeof wrapper<double>().t << "\n";}
	friend void f2();

	friend void f3(const T& arg) {
		cout << "f3(const T&): " << sizeof wrapper<double>().t << "\n";
	}

	friend void f4(const T& arg);

	friend void f5<T>();

	template <class U>
	friend void f6();
};

inline void f2() {cout << "f2(): " << sizeof wrapper<double>().t << "\n";}

template class wrapper<char>;
inline void f4(const char& arg) {
	cout << "f4(const char&): " << sizeof wrapper<double>().t << "\n";
}

template class wrapper<int>;
inline void f4(const int& arg) {
	cout << "f4(const int&): " << sizeof wrapper<double>().t << "\n";
}

template <class T>
inline void f5() {cout << "f5<T>(): " << sizeof wrapper<T>().t << "\n";}

template <class U>
inline void f6() {cout << "f6<U>(): " << sizeof wrapper<double>().t << "\n";}

int main()
{
	f1();
	f2();

	f3(10);
	f4('A');
	f4(10);

	f5<int>();
	f6<int>();

	return EXIT_SUCCESS;
}