---

#include <iostream>
#include <locale>

class MySingleton {
private:

	MySingleton() {

	}
public:

	static MySingleton& get_instance() {
		static MySingleton instance;
		return instance;
	}

	int singleton_pow(int num, int degree) {
		return pow(num, degree);
	}

	int i = 10;
};

std::ostream& operator<<(std::ostream& strm, const MySingleton& sing) {
	strm << sing.i;
	return strm;
}

void f(int i) { std::cout << i << std::endl; }

int main() {
	setlocale(LC_ALL, "RU");
	int a = MySingleton::get_instance().singleton_pow(5,2);
	std::cout << a << std::endl;
	
	MySingleton& (*f2)() = MySingleton::get_instance;
	std::cout << f2().singleton_pow(5,2) << std::endl;
	std::cout << f2 << std::endl;

	return 0;
}