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Minimal test - lines (38, 72)

Code

class ObserverList {
 public:
  /**
   * Note: When calling AddObserver, it's up to the caller to make sure the
   * object isn't going to be release as long as RemoveObserver hasn't been
   * called.
   *
   * @see RemoveObserver()
   */
  void AddObserver(Observer* aObserver) {
    mObservers.AppendElementUnlessExists(aObserver);
  }

  /**
   * Remove the observer from the observer list.
   * @return Whether the observer has been found in the list.
   */
  bool RemoveObserver(Observer* aObserver) {
    return mObservers.RemoveElement(aObserver);
  }

  uint32_t Length() { return mObservers.Length(); }

  /**
   * Call Notify() on each item in the list.
   */
  void Broadcast(const T& aParam) {
    for (Observer* obs : mObservers.ForwardRange()) {
      obs->Notify(aParam);
    }
  }

 protected:
  nsTObserverArray*> mObservers;
};

Minimal test - lines (23, 27)

Code

class Observer {
 public:
  virtual ~Observer() = default;
  virtual void Notify(const T& aParam) = 0;
};

Minimal test - lines (12, 74)

Code

namespace mozilla {

/**
 * Observer provides a way for a class to observe something.
 * When an event has to be broadcasted to all Observer, Notify() method
 * is called.
 * T represents the type of the object passed in argument to Notify().
 *
 * @see ObserverList.
 */
template 
class Observer {
 public:
  virtual ~Observer() = default;
  virtual void Notify(const T& aParam) = 0;
};

/**
 * ObserverList tracks Observer and can notify them when Broadcast() is
 * called.
 * T represents the type of the object passed in argument to Broadcast() and
 * sent to Observer objects through Notify().
 *
 * @see Observer.
 */
template 
class ObserverList {
 public:
  /**
   * Note: When calling AddObserver, it's up to the caller to make sure the
   * object isn't going to be release as long as RemoveObserver hasn't been
   * called.
   *
   * @see RemoveObserver()
   */
  void AddObserver(Observer* aObserver) {
    mObservers.AppendElementUnlessExists(aObserver);
  }

  /**
   * Remove the observer from the observer list.
   * @return Whether the observer has been found in the list.
   */
  bool RemoveObserver(Observer* aObserver) {
    return mObservers.RemoveElement(aObserver);
  }

  uint32_t Length() { return mObservers.Length(); }

  /**
   * Call Notify() on each item in the list.
   */
  void Broadcast(const T& aParam) {
    for (Observer* obs : mObservers.ForwardRange()) {
      obs->Notify(aParam);
    }
  }

 protected:
  nsTObserverArray*> mObservers;
};

}  // namespace mozilla