64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
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/*
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* Copyright (C) 2012 Open Source Robotics Foundation
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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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*/
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/* Desc: Singleton base class
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* Author: Nate Koenig
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* Date: 2 Sept 2007
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*/
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#ifndef _SINGLETONT_HH_
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#define _SINGLETONT_HH_
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#include "gazebo/util/system.hh"
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/// \addtogroup gazebo_common Common
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/// \{
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/// \class SingletonT SingletonT.hh common/common.hh
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/// \brief Singleton template class
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template <class T>
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class GZ_COMMON_VISIBLE SingletonT
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{
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/// \brief Get an instance of the singleton
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public: static T *Instance()
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{
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return &GetInstance();
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}
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/// \brief Constructor
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protected: SingletonT() {}
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/// \brief Destructor
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protected: virtual ~SingletonT() {}
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/// \brief Creates and returns a reference to the unique (static) instance
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private: static T &GetInstance()
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{
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static T t;
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return static_cast<T &>(t);
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}
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/// \brief A reference to the unique instance
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private: static T &myself;
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};
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/// \brief Initialization of the singleton instance.
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template <class T>
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T &SingletonT<T>::myself = SingletonT<T>::GetInstance();
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/// \}
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#endif
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