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-rw-r--r--include/utils/Singleton.h77
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diff --git a/include/utils/Singleton.h b/include/utils/Singleton.h
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--- a/include/utils/Singleton.h
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-/*
- * Copyright (C) 2007 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef ANDROID_UTILS_SINGLETON_H
-#define ANDROID_UTILS_SINGLETON_H
-
-#include <stdint.h>
-#include <sys/types.h>
-#include <utils/threads.h>
-#include <cutils/compiler.h>
-
-namespace android {
-// ---------------------------------------------------------------------------
-
-template <typename TYPE>
-class ANDROID_API Singleton
-{
-public:
- static TYPE& getInstance() {
- Mutex::Autolock _l(sLock);
- TYPE* instance = sInstance;
- if (instance == 0) {
- instance = new TYPE();
- sInstance = instance;
- }
- return *instance;
- }
-
- static bool hasInstance() {
- Mutex::Autolock _l(sLock);
- return sInstance != 0;
- }
-
-protected:
- ~Singleton() { };
- Singleton() { };
-
-private:
- Singleton(const Singleton&);
- Singleton& operator = (const Singleton&);
- static Mutex sLock;
- static TYPE* sInstance;
-};
-
-/*
- * use ANDROID_SINGLETON_STATIC_INSTANCE(TYPE) in your implementation file
- * (eg: <TYPE>.cpp) to create the static instance of Singleton<>'s attributes,
- * and avoid to have a copy of them in each compilation units Singleton<TYPE>
- * is used.
- * NOTE: we use a version of Mutex ctor that takes a parameter, because
- * for some unknown reason using the default ctor doesn't emit the variable!
- */
-
-#define ANDROID_SINGLETON_STATIC_INSTANCE(TYPE) \
- template class Singleton< TYPE >; \
- template<> Mutex Singleton< TYPE >::sLock(Mutex::PRIVATE); \
- template<> TYPE* Singleton< TYPE >::sInstance(0);
-
-
-// ---------------------------------------------------------------------------
-}; // namespace android
-
-#endif // ANDROID_UTILS_SINGLETON_H
-