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#include <iostream>
 
struct MyClass {
	int i;
	std::string s;
};
 
std::ostream& std::ostream::operator<< (std::ostream& os, MyClass& m) {
	os << "i = " << m.i << std::endl;
	os << "s = " << m.s << std::endl;
	return os;
}
 
int main() {
	// your code goes here
	MyClass m = {12345678, "Pinus"};
	std::cout << m << std::endl;
	return 0;
}

prog.cpp:8:13: error: specializing member 'std::basic_ostream<char>::operator<<' requires 'template<>' syntax
 std::ostream& std::ostream::operator<< (std::ostream& os, MyClass& m) {
             ^
prog.cpp: In function 'int main()':
prog.cpp:17:15: error: cannot bind 'std::ostream {aka std::basic_ostream<char>}' lvalue to 'std::basic_ostream<char>&&'
  std::cout << m << std::endl;
               ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:602:5: note: initializing argument 1 of 'std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = MyClass]'
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^

Standard output is empty