rodrigobastos

alguém saberia alguma documentaçao sobre padrão State? Fiz este codigo mas obtenho erro na linha Machine::off, Machine::on #include <iostream> using namespace std; class Machine { class State *current; public: Machine(); void setCurrent(State *s) { current = s; } void on(); void off(); }; class State { public: virtual void on(Machine *m) { cout << " already ON\n"; } virtual void off(Machine *m) { cout << " already OFF\n"; } }; void Machine::on() { current->on(this); } void Machine::off() { current->off(this); } class ON: public State { public: ON() { cout << " ON-ctor "; }; ~ON() { cout << " dtor-ON\n"; }; void off(Machine *m); }; class OFF: public State { public: OFF() { cout << " OFF-ctor "; }; ~OFF() { cout << " dtor-OFF\n"; }; void on(Machine *m) { cout << " going from OFF to ON"; m->setCurrent(new ON()); delete this; } }; void ON::off(Machine *m) { cout << " going from ON to OFF"; m->setCurrent(new OFF()); delete this; } Machine::Machine() { current = new OFF(); cout << '\n'; } int main() { void(Machine:: *ptrs[])() = { Machine::off, Machine::on }; Machine fsm; int num; while (1) { cout << "Enter 0/1: "; cin >> num; (fsm.*ptrs[num])(); } system("pause"); }