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62 lines
1.6 KiB
62 lines
1.6 KiB
// Copyright (C) 2020 The Libphonenumber Authors
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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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#ifndef I18N_PHONENUMBERS_BASE_MEMORY_SINGLETON_STDMUTEX_H_
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#define I18N_PHONENUMBERS_BASE_MEMORY_SINGLETON_STDMUTEX_H_
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#include <mutex>
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#include "phonenumbers/base/basictypes.h"
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namespace i18n {
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namespace phonenumbers {
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template <class T>
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class Singleton {
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public:
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Singleton() {}
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virtual ~Singleton() {}
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static T* GetInstance() {
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if (once_init_) {
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singleton_mutex_.lock();
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if (once_init_) {
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Init();
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once_init_ = false;
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}
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singleton_mutex_.unlock();
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}
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return instance_;
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}
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private:
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DISALLOW_COPY_AND_ASSIGN(Singleton);
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static void Init() {
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instance_ = new T();
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}
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static T* instance_; // Leaky singleton.
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static std::mutex singleton_mutex_;
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static bool once_init_;
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};
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template <class T> T* Singleton<T>::instance_;
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template <class T> std::mutex Singleton<T>::singleton_mutex_;
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template <class T> bool Singleton<T>::once_init_ = true;
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} // namespace phonenumbers
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} // namespace i18n
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#endif // I18N_PHONENUMBERS_BASE_MEMORY_SINGLETON_STDMUTEX_H_
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