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28 #ifndef TALK_APP_WEBRTC_NOTIFIER_H_
29 #define TALK_APP_WEBRTC_NOTIFIER_H_
33 #include "talk/app/webrtc/mediastreaminterface.h"
34 #include "webrtc/base/common.h"
38 // Implement a template version of a notifier.
40 class Notifier : public T {
45 virtual void RegisterObserver(ObserverInterface* observer) {
46 ASSERT(observer != NULL);
47 observers_.push_back(observer);
50 virtual void UnregisterObserver(ObserverInterface* observer) {
51 for (std::list<ObserverInterface*>::iterator it = observers_.begin();
52 it != observers_.end(); it++) {
53 if (*it == observer) {
60 void FireOnChanged() {
61 // Copy the list of observers to avoid a crash if the observer object
62 // unregisters as a result of the OnChanged() call. If the same list is used
63 // UnregisterObserver will affect the list make the iterator invalid.
64 std::list<ObserverInterface*> observers = observers_;
65 for (std::list<ObserverInterface*>::iterator it = observers.begin();
66 it != observers.end(); ++it) {
72 std::list<ObserverInterface*> observers_;
77 #endif // TALK_APP_WEBRTC_NOTIFIER_H_