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Hidden friend idiom
namespace N {
class MyType {
Mytype& operator+=(const MyType&);
void print(std::ostream&);
void swap(MyType&) noexcept;
friend MyType operator+(MyType a, const MyType& b) {
a += b;
return a;
friend std::ostream& operator<<(std::ostream& os, const MyType& b) {
return os;
friend void swap(MyType& a, MyType& b) noexcept {
} //namespace N
void test(N::MyType& t) {
t + t; // considers N::operator+
std::cout << t; // considers N::operator<<
swap(t, t); // considers N::swap
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