1 // 2 // Copyright 2021 Google, Inc. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at: 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #pragma once 18 19 #include <base/observer_list.h> 20 21 namespace btbase { 22 #if defined(BASE_VER) && BASE_VER > 780000 23 24 // Checked Observers aren't supported in the older libchrome so use unchecked 25 // ones instead to preserve behavior. 26 template <class ObserverType> 27 class AbstractObserverList 28 : public base::ObserverList<ObserverType>::Unchecked {}; 29 30 #else 31 32 template <class ObserverType> 33 class AbstractObserverList : public base::ObserverList<ObserverType> {}; 34 35 #endif 36 } // namespace btbase 37