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52 lines
1.4 KiB
52 lines
1.4 KiB
// Copyright (C) 2011 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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// Author: Philippe Liard
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#ifndef I18N_PHONENUMBERS_BASE_SINGLETON_H_
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#define I18N_PHONENUMBERS_BASE_SINGLETON_H_
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#include <boost/scoped_ptr.hpp>
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#include <boost/thread/once.hpp>
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#include <boost/utility.hpp>
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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 : private boost::noncopyable {
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public:
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virtual ~Singleton() {}
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static T* GetInstance() {
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boost::call_once(Init, flag);
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return instance.get();
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}
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private:
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static void Init() {
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instance.reset(new T());
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}
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static boost::scoped_ptr<T> instance;
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static boost::once_flag flag;
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};
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template <class T> boost::scoped_ptr<T> Singleton<T>::instance;
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template <class T> boost::once_flag Singleton<T>::flag = BOOST_ONCE_INIT;
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} // namespace phonenumbers
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} // namespace i18n
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#endif // I18N_PHONENUMBERS_BASE_SINGLETON_H_
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