projects/state/main.cpp - main - rgd045/cpp-oop-basics

projects/state/main.cpp
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OMP Education
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28 июн 2024, 01:09
28 июн 2024, 01:090ef3df8
// SPDX-FileCopyrightText: 2023 Open Mobile Platform LLC <edu@omp.ru>
// SPDX-License-Identifier: BSD-3-Clause

#include <iostream>

class AirConditioner;

class State {
    protected:
        AirConditioner* m_heater;

    public:
        virtual ~State() {};

        void setAirConditioner(AirConditioner* heater) {
            m_heater = heater;
        }

    virtual void heat() = 0;
    virtual void cool() = 0;
    virtual void on() = 0;

};

class AirConditioner {
    private:
        State* m_state;

    public:
        AirConditioner(State* state): m_state{nullptr} {
            transitionTo(state);
        }

        ~AirConditioner() {
            delete m_state;
        }
    
        void transitionTo(State* state) {
            if (m_state) {
                delete m_state;
            }
            m_state = state;
            m_state->setAirConditioner(this);
        }
        
        void heat() {
            m_state->heat();
        }
        
        void cool() {
            m_state->cool();
        }

        void on() {
            m_state->on();
        }

};

class OnState: public State {
    public:
        void heat() {
            std::cout << "Heating..." << std::endl;
        }
        void cool() {
            std::cout << "Cooling..." << std::endl;
        }
        void on() {
            std::cout << "Already is on" << std::endl;
        }
};

class OffState: public State {
    public:
        void heat() {
            std::cout << "Can't heat. State is off" << std::endl;
        }
        void cool() {
            std::cout << "Can't cool. State is off" << std::endl;
        }
        void on() {
            std::cout << "Power on" << std::endl;
            m_heater->transitionTo(new OnState);
        }
};


int main() {
    AirConditioner heater {new OffState};
    heater.cool();
    heater.heat();
    heater.on();
    heater.on();
    heater.cool();
    heater.heat();
    return 0;
}