#include #include #include class Reversible { private: std::string data; int state_p; std::vector state; void stateHandler() { state.resize(state_p+1); state.push_back(data); state_p = state.size()-1; } public: Reversible() { Reversible(""); } Reversible(std::string data) { state_p = 0; setData(data); } void setData(std::string data) { this->data = data; stateHandler(); } std::string getData() { return data; } void undoState() { state_p -= (state_p-1 >= 0); data = state[state_p]; } void redoState() { state_p += (state_p+1 < state.size()); data = state[state_p]; } }; int main() { Reversible obj{"state1"}; std::cout << obj.getData() << "\n"; obj.setData("state2"); std::cout << obj.getData() << "\n"; obj.setData("state3"); std::cout << obj.getData() << "\n"; obj.setData("state4"); std::cout << obj.getData() << "\n"; obj.undoState(); std::cout << obj.getData() << "\n"; obj.undoState(); std::cout << obj.getData() << "\n"; obj.redoState(); std::cout << obj.getData() << "\n"; obj.setData("state5"); std::cout << obj.getData() << "\n"; obj.undoState(); std::cout << obj.getData() << "\n"; obj.undoState(); std::cout << obj.getData() << "\n"; obj.redoState(); obj.redoState(); std::cout << obj.getData() << "\n"; }

Reversible State Object