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/*!
@file
Defines `boost::hana::detail::variadic::reverse_apply_flat`.
@copyright Louis Dionne 2013-2016
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_FLAT_HPP
#define BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_FLAT_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/detail/variadic/at.hpp>
#include <utility>
BOOST_HANA_NAMESPACE_BEGIN namespace detail { namespace variadic {
template <int ...i, typename F, typename ...X>
constexpr decltype(auto)
reverse_apply_flat_helper(std::integer_sequence<int, i...>, F&& f, X&& ...x)
{
return static_cast<F&&>(f)(
detail::variadic::at<sizeof...(x) - i - 1>(
static_cast<X&&>(x)...
)...
);
}
template <typename F, typename ...X>
constexpr decltype(auto) reverse_apply_flat(F&& f, X&& ...x) {
return reverse_apply_flat_helper(
std::make_integer_sequence<int, sizeof...(x)>{},
static_cast<F&&>(f),
static_cast<X&&>(x)...
);
}
}} BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_FLAT_HPP
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