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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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