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
28 * If some singleton's implementation uses another singletons implementation,
29 * those templates make the second singleton a dubleton. Be warned. Try to use
30 * singleton_safe_impl.h if possible.
36 template<typename Class>
37 Singleton<Class>& Singleton<Class>::InternalInstance()
39 static Singleton<Class> instance;
43 template<typename Class>
44 Class &Singleton<Class>::Instance()
46 Singleton<Class>& instance = Singleton<Class>::InternalInstance();
48 if (!!instance.m_guard)
50 Assert(Thread::GetCurrentThread() == *instance.m_guard &&
51 "Singleton thread guard failed. A forbidden call from foreign thread was detected!");
58 template<typename Class>
59 void Singleton<Class>::SetThreadGuard(Thread *thread)
61 Singleton<Class>& instance = Singleton<Class>::InternalInstance();
62 instance.m_guard = OptionalThreadPtr(thread);
65 template<typename Class>
66 void Singleton<Class>::ResetThreadGuard()
68 Singleton<Class>& instance = Singleton<Class>::InternalInstance();
69 instance.m_guard = OptionalThreadPtr::Null;
74 #define IMPLEMENT_SINGLETON(Type) \
75 template DPL::Singleton<Type>& DPL::Singleton<Type>::InternalInstance(); \
76 template Type& DPL::Singleton<Type>::Instance(); \
77 template void DPL::Singleton<Type>::SetThreadGuard(DPL::Thread *thread); \
78 template void DPL::Singleton<Type>::ResetThreadGuard();
80 #endif // DPL_SINGLETON_IMPL_H