9f88afb013
commit e5c24638f98162c3b75b4c67a16b510d38e31341
Author: Mathias Agopian <mathias@google.com>
Date: Fri Apr 17 14:09:03 2009 -0700
oops forgot this file.
commit 282642632d0cb12882eecf42e0fdfb2343275de1
Author: Mathias Agopian <mathias@google.com>
Date: Fri Apr 17 14:07:32 2009 -0700
use a helper macro for creating Singleton<>'s static attributes instances.
69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_UTILS_SINGLETON_H
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#define ANDROID_UTILS_SINGLETON_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/threads.h>
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namespace android {
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// ---------------------------------------------------------------------------
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template <typename TYPE>
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class Singleton
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{
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public:
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static TYPE& getInstance() {
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Mutex::Autolock _l(sLock);
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TYPE* instance = sInstance;
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if (instance == 0) {
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instance = new TYPE();
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sInstance = instance;
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}
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return *instance;
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}
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protected:
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~Singleton() { };
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Singleton() { };
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private:
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Singleton(const Singleton&);
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Singleton& operator = (const Singleton&);
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static Mutex sLock;
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static TYPE* sInstance;
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};
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/*
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* use ANDROID_SINGLETON_STATIC_INSTANCE(TYPE) in your implementation file
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* (eg: <TYPE>.cpp) to create the static instance of Singleton<>'s attributes,
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* and avoid to have a copy of them in each compilation units Singleton<TYPE>
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* is used.
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*/
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#define ANDROID_SINGLETON_STATIC_INSTANCE(TYPE) \
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template< class TYPE > Mutex Singleton< TYPE >::sLock; \
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template<> TYPE* Singleton< TYPE >::sInstance(0);
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// ---------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_UTILS_SINGLETON_H
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