1 // Copyright (C) 2013 The Libphonenumber Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef I18N_PHONENUMBERS_BASE_MEMORY_SINGLETON_POSIX_H_ 16 #define I18N_PHONENUMBERS_BASE_MEMORY_SINGLETON_POSIX_H_ 17 18 #include <pthread.h> 19 20 #include "phonenumbers/base/logging.h" 21 22 namespace i18n { 23 namespace phonenumbers { 24 25 template <class T> 26 class Singleton { 27 public: ~Singleton()28 virtual ~Singleton() {} 29 GetInstance()30 static T* GetInstance() { 31 const int ret = pthread_once(&once_control_, &Init); 32 (void) ret; 33 DCHECK_EQ(0, ret); 34 return instance_; 35 } 36 37 private: Init()38 static void Init() { 39 instance_ = new T(); 40 } 41 42 static T* instance_; // Leaky singleton. 43 static pthread_once_t once_control_; 44 }; 45 46 template <class T> T* Singleton<T>::instance_; 47 template <class T> pthread_once_t Singleton<T>::once_control_ = 48 PTHREAD_ONCE_INIT; 49 50 } // namespace phonenumbers 51 } // namespace i18n 52 53 #endif // I18N_PHONENUMBERS_BASE_MEMORY_SINGLETON_POSIX_H_ 54