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/*
* Copyright (C) 2016 Open Source Robotics Foundation
*
* 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 IGNITION_COMMON_SINGLETONT_HH_
#define IGNITION_COMMON_SINGLETONT_HH_
namespace ignition
{
namespace common
{
/// \class SingletonT SingletonT.hh common/common.hh
/// \brief Singleton template class
template <class T>
class SingletonT
{
/// \brief Get an instance of the singleton
public: static T *Instance()
{
return &GetInstance();
}
/// \brief Constructor
protected: SingletonT() {}
/// \brief Destructor
protected: virtual ~SingletonT() {}
/// \brief Creates and returns a reference to the unique (static) instance
private: static T &GetInstance()
{
static T t;
return static_cast<T &>(t);
}
/// \brief A reference to the unique instance
private: static T &myself;
};
/// \brief Initialization of the singleton instance.
template <class T>
T &SingletonT<T>::myself = SingletonT<T>::GetInstance();
}
}
#endif
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