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/**
* \file
* \brief ReverseAdaptor template class header.
*
* \author Copyright (C) 2014-2015 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 ESTD_REVERSEADAPTOR_HPP_
#define ESTD_REVERSEADAPTOR_HPP_
namespace estd
{
/**
* \brief ReverseAdaptor template class is an adaptor that "reverses" access to the container
*
* \tparam T is the type of container
*/
template<typename T>
class ReverseAdaptor
{
public:
/**
* \brief ReverseAdaptor's constructor.
*
* \param [in] container is a reference to container
*/
constexpr explicit ReverseAdaptor(T& container) noexcept :
container_{container}
{
}
/**
* \return reverse_iterator to the beginning of "reversed" container (last element of original container)
*/
typename T::reverse_iterator begin() const noexcept
{
return container_.rbegin();
}
/**
* \return reverse_iterator to the end of "reversed" container (before-the-first element of original container)
*/
typename T::reverse_iterator end() const noexcept
{
return container_.rend();
}
private:
/// reference to container
T& container_;
};
/**
* \brief Helper factory function to make ReverseAdaptor object with deduced template arguments
*
* \tparam T is the type of container
*
* \param [in] container is a reference to container
*
* \return ReverseAdaptor object
*/
template<typename T>
ReverseAdaptor<T> makeReverseAdaptor(T& container)
{
return ReverseAdaptor<T>{container};
}
} // namespace estd
#endif // ESTD_REVERSEADAPTOR_HPP_
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