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/**
* \file
* \brief apply() 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 ESTD_APPLY_HPP_
#define ESTD_APPLY_HPP_
#include "estd/IntegerSequence.hpp"
#include "estd/invoke.hpp"
#include <tuple>
namespace estd
{
namespace internal
{
/**
* \brief Implementation of apply()
*
* \tparam Function is the function object that will be invoked
* \tparam Tuple is the type of tuple of arguments
* \tparam Indexes is a sequence of std::size_t indexes for \a Tuple
*
* \param [in] function is the function object that will be executed
* \param [in] tuple is the tuple of arguments
*
* \return value returned by call to \a function with arguments from \a tuple
*/
template<typename Function, typename Tuple, std::size_t... Indexes>
constexpr auto apply(Function&& function, Tuple&& tuple, estd::IndexSequence<Indexes...>) ->
decltype(estd::invoke(std::forward<Function>(function), std::get<Indexes>(std::forward<Tuple>(tuple))...))
{
return estd::invoke(std::forward<Function>(function), std::get<Indexes>(std::forward<Tuple>(tuple))...);
}
} // namespace internal
/**
* \brief Invokes callable object with a tuple of arguments.
*
* Implementation inspired by http://en.cppreference.com/w/cpp/experimental/apply
*
* \tparam Function is the function object that will be invoked
* \tparam Tuple is the type of tuple of arguments
*
* \param [in] function is the function object that will be executed
* \param [in] tuple is the tuple of arguments
*
* \return value returned by call to \a function with arguments from \a tuple
*/
template <typename Function, typename Tuple>
constexpr auto apply(Function&& function, Tuple&& tuple) ->
decltype(internal::apply(std::forward<Function>(function), std::forward<Tuple>(tuple),
estd::MakeIndexSequence<std::tuple_size<typename std::decay<Tuple>::type>{}>{}))
{
return internal::apply(std::forward<Function>(function), std::forward<Tuple>(tuple),
estd::MakeIndexSequence<std::tuple_size<typename std::decay<Tuple>::type>{}>{});
}
} // namespace estd
#endif // ESTD_APPLY_HPP_
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