wtf

wtf.cpp

#include <iostream>

class A
{
public:
    void fn() & {
        std::cout << "A" << std::endl;
    }
    void fn() && {
        std::cout << "B" << std::endl;
    }
};

A getA()
{
    return A();
}

int main(int argc, const char **argv)
{
    A a;
    a.fn();
    getA().fn();
  
    return 0;
}