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/*!
@file
Defines `boost::hana::detail::variadic::reverse_apply_unrolled`.
@copyright Louis Dionne 2013-2017
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_UNROLLED_HPP
#define BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_UNROLLED_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/functional/reverse_partial.hpp>
BOOST_HANA_NAMESPACE_BEGIN namespace detail { namespace variadic {
struct reverse_apply_unrolled_impl {
template <typename F>
constexpr decltype(auto) operator()(F&& f) const {
return static_cast<F&&>(f)();
}
template <typename F, typename X1>
constexpr decltype(auto) operator()(F&& f, X1&& x1) const {
return static_cast<F&&>(f)(
static_cast<X1&&>(x1)
);
}
template <typename F, typename X1, typename X2>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2) const {
return static_cast<F&&>(f)(
static_cast<X2&&>(x2),
static_cast<X1&&>(x1)
);
}
template <typename F, typename X1, typename X2, typename X3>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, X3&& x3) const {
return static_cast<F&&>(f)(
static_cast<X3&&>(x3),
static_cast<X2&&>(x2),
static_cast<X1&&>(x1)
);
}
template <typename F, typename X1, typename X2, typename X3, typename X4>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4) const {
return static_cast<F&&>(f)(
static_cast<X4&&>(x4),
static_cast<X3&&>(x3),
static_cast<X2&&>(x2),
static_cast<X1&&>(x1)
);
}
template <typename F, typename X1, typename X2, typename X3, typename X4, typename X5>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4, X5&& x5) const {
return static_cast<F&&>(f)(
static_cast<X5&&>(x5),
static_cast<X4&&>(x4),
static_cast<X3&&>(x3),
static_cast<X2&&>(x2),
static_cast<X1&&>(x1)
);
}
template <typename F, typename X1, typename X2, typename X3, typename X4, typename X5, typename X6, typename ...Xn>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4, X5&& x5, X6&& x6, Xn&& ...xn) const {
return (*this)(hana::reverse_partial(
static_cast<F&&>(f)
, static_cast<X6&&>(x6)
, static_cast<X5&&>(x5)
, static_cast<X4&&>(x4)
, static_cast<X3&&>(x3)
, static_cast<X2&&>(x2)
, static_cast<X1&&>(x1)
), static_cast<Xn&&>(xn)...);
}
};
constexpr reverse_apply_unrolled_impl reverse_apply_unrolled{};
}} BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_UNROLLED_HPP
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