#include #include using namespace std; //The class Secret saves important rotected by passwords class Secret{ string content{""}; string pass{""}; public: Secret(string content): content{content}{} //open object, no password Secret(string content, string pass): content{content}, pass{pass}{} //locked object, password bool lock(string password){ if(pass.length() != 0) return false; pass = password; return true; } bool unlock(string password){ if(pass == password) { pass = ""; return true; } return false; } int len(){ string p = pass; if(!this->unlock(this->pass)) { this->lock(p); return 0; } return this->content.length(); } void print(){ if(pass.length() != 0){ cout << "Object is locked!\n"; return; } cout << content << endl; } Secret operator+(Secret s){ Secret joined(""); string a = pass; string b = s.pass; if(pass.size() == 0 && s.pass.size() == 0){ joined.content = pass += s.pass; joined.print(); } return joined; } }; int main(){ Secret s{"Top Secret", "123"}; s.print(); s.unlock("123"); s.print(); cout << s.len() << endl; Secret p{"Not "}; Secret r = s+p; r.print(); return 0; }

Secret class