/*!
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@file
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Defines `boost::hana::detail::variadic::reverse_apply_flat`.
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@copyright Louis Dionne 2013-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_FLAT_HPP
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#define BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_FLAT_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/detail/variadic/at.hpp>
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#include <utility>
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BOOST_HANA_NAMESPACE_BEGIN namespace detail { namespace variadic {
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template <int ...i, typename F, typename ...X>
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constexpr decltype(auto)
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reverse_apply_flat_helper(std::integer_sequence<int, i...>, F&& f, X&& ...x)
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{
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return static_cast<F&&>(f)(
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detail::variadic::at<sizeof...(x) - i - 1>(
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static_cast<X&&>(x)...
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)...
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);
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}
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template <typename F, typename ...X>
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constexpr decltype(auto) reverse_apply_flat(F&& f, X&& ...x) {
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return reverse_apply_flat_helper(
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std::make_integer_sequence<int, sizeof...(x)>{},
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static_cast<F&&>(f),
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static_cast<X&&>(x)...
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);
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}
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}} BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_FLAT_HPP
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