#include <iostream>
int main() {
std::string str = "test";
std::string& ref = (std::string&) str;
std::cout << ref << std::endl;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgoKaW50IG1haW4oKSB7CglzdGQ6OnN0cmluZyBzdHIgPSAidGVzdCI7CglzdGQ6OnN0cmluZyYgcmVmID0gKHN0ZDo6c3RyaW5nJikgc3RyOwoJCglzdGQ6OmNvdXQgPDwgcmVmIDw8IHN0ZDo6ZW5kbDsKCQoJcmV0dXJuIDA7Cn0=