How do I implement the observer pattern in financial systems with C++?

The Observer Pattern is commonly used in financial systems to ensure that the components of the system respond dynamically to changes in market data, portfolio values, or other financial indicators. This design pattern allows an object (the subject) to maintain a list of its dependents (observers) and notify them automatically of any state changes, facilitating a publish-subscribe mechanism.

Implementation Example in C++


// Observer interface
class Observer {
public:
    virtual void update(float stockPrice) = 0;
};

// Subject interface
class Subject {
public:
    virtual void attach(Observer* observer) = 0;
    virtual void detach(Observer* observer) = 0;
    virtual void notify() = 0;
};

// Concrete Subject
class Stock : public Subject {
private:
    std::vector observers;
    float stockPrice;

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

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

    void notify() override {
        for (Observer* observer : observers) {
            observer->update(stockPrice);
        }
    }

    void setPrice(float price) {
        stockPrice = price;
        notify(); // Notify observers about the price change
    }
};

// Concrete Observer
class Investor : public Observer {
private:
    std::string name;

public:
    Investor(const std::string& name) : name(name) {}

    void update(float stockPrice) override {
        std::cout << "Investor " << name << " notified. New stock price: " << stockPrice << std::endl;
    }
};

// Usage
int main() {
    Stock stock;
    Investor investor1("Alice");
    Investor investor2("Bob");

    stock.attach(&investor1);
    stock.attach(&investor2);

    stock.setPrice(150.0f); // Notify investors of new price
    stock.setPrice(155.0f); // Notify investors of new price

    return 0;
}

How do I implement the observer pattern in financial systems with C++?

Implementation Example in C++

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How do I implement the observer pattern in financial systems with C++?

Implementation Example in C++

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