2 * Copyright (c) 2011 Samsung Electronics Co., Ltd All Rights Reserved
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 * @file singleton_impl.h
18 * @author Lukasz Wrzosek (l.wrzosek@samsung.com)
20 * @brief This file is the implementation file of singleton
22 #ifndef DPL_SINGLETON_IMPL_H
23 #define DPL_SINGLETON_IMPL_H
30 * If some singleton's implementation uses another singletons implementation,
31 * those templates make the second singleton a dubleton. Be warned. Try to use
32 * singleton_safe_impl.h if possible.
37 template<typename Class>
38 std::once_flag Singleton<Class>::m_onceFlag;
40 template<typename Class>
41 Singleton<Class>& Singleton<Class>::InternalInstance()
43 static Singleton<Class>* instance = NULL;
44 std::call_once(m_onceFlag,
46 instance = new Singleton<Class>;
51 template<typename Class>
52 Class &Singleton<Class>::Instance()
54 Singleton<Class>& instance = Singleton<Class>::InternalInstance();
59 #define IMPLEMENT_SINGLETON(Type) \
60 template DPL::Singleton<Type>&DPL::Singleton<Type>::InternalInstance(); \
61 template Type & DPL::Singleton<Type>::Instance(); \
63 #endif // DPL_SINGLETON_IMPL_H