observer_pattern

namespace observer_pattern

Namespace for the Observer pattern.

class ConcreteObserver : public observer_pattern::Observer

#include <observer.hpp>

Concrete implementation of an Observer.

Subclassed by TestObserver

Public Functions

inline ConcreteObserver(const std::string &name, std::shared_ptr<Subject> subject)

Constructor for ConcreteObserver.

Parameters:

• name – The name of the observer.

• subject – The subject to observe.

inline std::string getName() const

Get the name of the observer.

Returns:

The name of the observer.

inline virtual void update() override

Updates the observer when notified by the subject.

class ConcreteSubject : public observer_pattern::Subject

#include <observer.hpp>

Concrete implementation of a Subject.

Public Functions

inline virtual void attach(std::shared_ptr<Observer> observer) override

Attach an observer to the subject.

Parameters:

observer – The observer to attach.

inline virtual void detach(std::shared_ptr<Observer> observer) override

Detach an observer from the subject.

Parameters:

observer – The observer to detach.

inline virtual void notify() override

Notify all attached observers of a change.

inline virtual std::string getState() const override

Get the current state of the subject.

Returns:

The current state as a string.

inline virtual void setState(const std::string &newState) override

Set the state of the subject and notify observers.

Parameters:

newState – The new state of the subject.

class Observer

#include <observer.hpp>

Abstract base class representing an observer in the Observer pattern.

Subclassed by observer_pattern::ConcreteObserver

Public Functions

virtual ~Observer() = default

Virtual destructor for cleanup of derived classes.

virtual void update() = 0

Called to notify the observer of changes in the subject.

class Subject

#include <observer.hpp>

Abstract base class representing a subject in the Observer pattern.

Subclassed by observer_pattern::ConcreteSubject

Public Functions

virtual ~Subject() = default

Virtual destructor for cleanup of derived classes.

virtual void attach(std::shared_ptr<Observer> observer) = 0

Attach an observer to the subject.

Parameters:

observer – The observer to attach.

virtual void detach(std::shared_ptr<Observer> observer) = 0

Detach an observer from the subject.

Parameters:

observer – The observer to detach.

virtual void notify() = 0

Notify all attached observers of a change.

virtual std::string getState() const = 0

Get the state of the subject.

Returns:

The current state of the subject as a string.

virtual void setState(const std::string &state) = 0

Set the state of the subject.

Parameters:

state – The new state of the subject.