/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/** * Observer<T> provides a way for a class to observe something. * When an event has to be broadcasted to all Observer<T>, Notify() method * is called. * T represents the type of the object passed in argument to Notify(). * * @see ObserverList.
*/ template <class T> class Observer { public: virtual ~Observer() = default; virtualvoid Notify(const T& aParam) = 0;
};
/** * ObserverList<T> tracks Observer<T> and can notify them when Broadcast() is * called. * T represents the type of the object passed in argument to Broadcast() and * sent to Observer<T> objects through Notify(). * * @see Observer.
*/ template <class T> 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<T>* aObserver) {
mObservers.AppendElementUnlessExists(aObserver);
}
/** * Remove the observer from the observer list. * @return Whether the observer has been found in the list.
*/ bool RemoveObserver(Observer<T>* 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<T>* obs : mObservers.ForwardRange()) {
obs->Notify(aParam);
}
}
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