hana/detail/nested_than.hpp

0001 /*!
0002 @file
0003 Defines `boost::hana::detail::nested_than`.
0004
0005 Copyright Louis Dionne 2013-2022
0006 Distributed under the Boost Software License, Version 1.0.
0007 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
0008  */
0009
0010 #ifndef BOOST_HANA_DETAIL_NESTED_THAN_HPP
0011 #define BOOST_HANA_DETAIL_NESTED_THAN_HPP
0012
0013 #include <boost/hana/detail/nested_than_fwd.hpp>
0014
0015 #include <boost/hana/config.hpp>
0016 #include <boost/hana/functional/flip.hpp>
0017 #include <boost/hana/functional/partial.hpp>
0018
0019
0020 namespace boost { namespace hana { namespace detail {
0021     //! @cond
0022     template <typename Algorithm>
0023     template <typename X>
0024     constexpr decltype(auto) nested_than_t<Algorithm>::operator()(X&& x) const
0025     { return hana::partial(hana::flip(Algorithm{}), static_cast<X&&>(x)); }
0026     //! @endcond
0027 } }} // end namespace boost::hana
0028
0029 #endif // !BOOST_HANA_DETAIL_NESTED_THAN_HPP