projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /*! |
| 2 | @file | |
| 3 | Defines `boost::hana::not_equal`. | |
| 4 | ||
| 5 | @copyright Louis Dionne 2013-2016 | |
| 6 | Distributed under the Boost Software License, Version 1.0. | |
| 7 | (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) | |
| 8 | */ | |
| 9 | ||
| 10 | #ifndef BOOST_HANA_NOT_EQUAL_HPP | |
| 11 | #define BOOST_HANA_NOT_EQUAL_HPP | |
| 12 | ||
| 13 | #include <boost/hana/fwd/not_equal.hpp> | |
| 14 | ||
| 15 | #include <boost/hana/concept/comparable.hpp> | |
| 16 | #include <boost/hana/config.hpp> | |
| 17 | #include <boost/hana/core/to.hpp> | |
| 18 | #include <boost/hana/core/dispatch.hpp> | |
| 19 | #include <boost/hana/detail/has_common_embedding.hpp> | |
| 20 | #include <boost/hana/detail/nested_to.hpp> // required by fwd decl | |
| 21 | #include <boost/hana/equal.hpp> | |
| 22 | #include <boost/hana/not.hpp> | |
| 23 | ||
| 24 | ||
| 25 | BOOST_HANA_NAMESPACE_BEGIN | |
| 26 | //! @cond | |
| 27 | template <typename X, typename Y> | |
| 28 | constexpr auto not_equal_t::operator()(X&& x, Y&& y) const { | |
| 29 | using T = typename hana::tag_of<X>::type; | |
| 30 | using U = typename hana::tag_of<Y>::type; | |
| 31 | using NotEqual = not_equal_impl<T, U>; | |
| 32 | return NotEqual::apply(static_cast<X&&>(x), static_cast<Y&&>(y)); | |
| 33 | } | |
| 34 | //! @endcond | |
| 35 | ||
| 36 | template <typename T, typename U, bool condition> | |
| 37 | struct not_equal_impl<T, U, when<condition>> : default_ { | |
| 38 | template <typename X, typename Y> | |
| 39 | static constexpr decltype(auto) apply(X&& x, Y&& y) { | |
| 40 | return hana::not_(hana::equal(static_cast<X&&>(x), | |
| 41 | static_cast<Y&&>(y))); | |
| 42 | } | |
| 43 | }; | |
| 44 | ||
| 45 | // Cross-type overload | |
| 46 | template <typename T, typename U> | |
| 47 | struct not_equal_impl<T, U, when< | |
| 48 | detail::has_nontrivial_common_embedding<Comparable, T, U>::value | |
| 49 | >> { | |
| 50 | using C = typename hana::common<T, U>::type; | |
| 51 | template <typename X, typename Y> | |
| 52 | static constexpr decltype(auto) apply(X&& x, Y&& y) { | |
| 53 | return hana::not_equal(hana::to<C>(static_cast<X&&>(x)), | |
| 54 | hana::to<C>(static_cast<Y&&>(y))); | |
| 55 | } | |
| 56 | }; | |
| 57 | BOOST_HANA_NAMESPACE_END | |
| 58 | ||
| 59 | #endif // !BOOST_HANA_NOT_EQUAL_HPP |