How do I implement the observer pattern in game engines with C++?

The Observer Pattern is a behavioral design pattern that establishes a one-to-many relationship between objects, allowing one object (the subject) to notify multiple dependent objects (observers) about changes in its state. This pattern is particularly useful in game engines, where different components need to react to changes in the game state.

Implementing the Observer Pattern in C++ for Game Engines

Here's a simple implementation of the Observer pattern in C++ tailored for game engines:


    // Observer interface
    class Observer {
    public:
        virtual ~Observer() {}
        virtual void onNotify(int eventType) = 0;
    };

    // Subject class
    class Subject {
    private:
        std::vector observers;

    public:
        void addObserver(Observer* observer) {
            observers.push_back(observer);
        }

        void removeObserver(Observer* observer) {
            observers.erase(std::remove(observers.begin(), observers.end(), observer), observers.end());
        }

        void notify(int eventType) {
            for (Observer* observer : observers) {
                observer->onNotify(eventType);
            }
        }
    };

    // Example Observer Implementation
    class Player : public Observer {
    public:
        void onNotify(int eventType) override {
            if (eventType == 1) {
                std::cout << "Player received an event!" << std::endl;
            }
        }
    };

    // Example Subject Implementation
    class GameEvent : public Subject {
    public:
        void triggerEvent() {
            notify(1); // Notify observers of an event
        }
    };

    // Usage
    int main() {
        GameEvent gameEvent;
        Player player;

        gameEvent.addObserver(&player); // Register player as an observer
        gameEvent.triggerEvent(); // This will notify the player

        return 0;
    }

How do I implement the observer pattern in game engines with C++?

Implementing the Observer Pattern in C++ for Game Engines

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How do I implement the observer pattern in game engines with C++?

Implementing the Observer Pattern in C++ for Game Engines

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