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/**
* \file
* \brief SwapPopQueueFunctor class header
*
* \author Copyright (C) 2015 Kamil Szczygiel http://www.distortec.com http://www.freddiechopin.info
*
* \par License
* This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not
* distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef INCLUDE_DISTORTOS_INTERNAL_SYNCHRONIZATION_SWAPPOPQUEUEFUNCTOR_HPP_
#define INCLUDE_DISTORTOS_INTERNAL_SYNCHRONIZATION_SWAPPOPQUEUEFUNCTOR_HPP_
#include "distortos/internal/synchronization/QueueFunctor.hpp"
#include <utility>
namespace distortos
{
namespace internal
{
/**
* SwapPopQueueFunctor is a functor used for popping of data from the queue using swap
*
* \tparam T is the type of data popped from the queue
*/
template<typename T>
class SwapPopQueueFunctor : public QueueFunctor
{
public:
/**
* \brief SwapPopQueueFunctor's constructor
*
* \param [out] value is a reference to object that will be used to return popped value, its contents are swapped
* with the value in the queue's storage and destructed when no longer needed
*/
constexpr explicit SwapPopQueueFunctor(T& value) :
value_{value}
{
}
/**
* \brief Swaps the element in the queue's storage with the value provided by user and destroys this value when no
* longer needed.
*
* \param [in,out] storage is a pointer to storage with element
*/
void operator()(void* const storage) const override
{
auto& swappedValue = *reinterpret_cast<T*>(storage);
using std::swap;
swap(value_, swappedValue);
swappedValue.~T();
}
private:
/// reference to object that will be used to return popped value
T& value_;
};
} // namespace internal
} // namespace distortos
#endif // INCLUDE_DISTORTOS_INTERNAL_SYNCHRONIZATION_SWAPPOPQUEUEFUNCTOR_HPP_
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