projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 20effc67 TL |
1 | // |
| 2 | // traits/equality_comparable.hpp | |
| 3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
| 4 | // | |
| 1e59de90 | 5 | // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| 20effc67 TL |
6 | // |
| 7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
| 9 | // | |
| 10 | ||
| 11 | #ifndef BOOST_ASIO_TRAITS_EQUALITY_COMPARABLE_HPP | |
| 12 | #define BOOST_ASIO_TRAITS_EQUALITY_COMPARABLE_HPP | |
| 13 | ||
| 14 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
| 15 | # pragma once | |
| 16 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
| 17 | ||
| 18 | #include <boost/asio/detail/config.hpp> | |
| 19 | #include <boost/asio/detail/type_traits.hpp> | |
| 20 | ||
| 21 | #if defined(BOOST_ASIO_HAS_DECLTYPE) \ | |
| 22 | && defined(BOOST_ASIO_HAS_NOEXCEPT) \ | |
| 23 | && defined(BOOST_ASIO_HAS_WORKING_EXPRESSION_SFINAE) | |
| 24 | # define BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT 1 | |
| 25 | #endif // defined(BOOST_ASIO_HAS_DECLTYPE) | |
| 26 | // && defined(BOOST_ASIO_HAS_NOEXCEPT) | |
| 27 | // && defined(BOOST_ASIO_HAS_WORKING_EXPRESSION_SFINAE) | |
| 28 | ||
| 29 | namespace boost { | |
| 30 | namespace asio { | |
| 31 | namespace traits { | |
| 32 | ||
| 33 | template <typename T, typename = void> | |
| 34 | struct equality_comparable_default; | |
| 35 | ||
| 36 | template <typename T, typename = void> | |
| 37 | struct equality_comparable; | |
| 38 | ||
| 39 | } // namespace traits | |
| 40 | namespace detail { | |
| 41 | ||
| 42 | struct no_equality_comparable | |
| 43 | { | |
| 44 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = false); | |
| 45 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); | |
| 46 | }; | |
| 47 | ||
| 48 | #if defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) | |
| 49 | ||
| 50 | template <typename T, typename = void> | |
| 51 | struct equality_comparable_trait : no_equality_comparable | |
| 52 | { | |
| 53 | }; | |
| 54 | ||
| 55 | template <typename T> | |
| 56 | struct equality_comparable_trait<T, | |
| 57 | typename void_type< | |
| 58 | decltype( | |
| 59 | static_cast<void>( | |
| 60 | static_cast<bool>(declval<const T>() == declval<const T>()) | |
| 61 | ), | |
| 62 | static_cast<void>( | |
| 63 | static_cast<bool>(declval<const T>() != declval<const T>()) | |
| 64 | ) | |
| 65 | ) | |
| 66 | >::type> | |
| 67 | { | |
| 68 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
| 69 | ||
| 70 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = | |
| 71 | noexcept(declval<const T>() == declval<const T>()) | |
| 72 | && noexcept(declval<const T>() != declval<const T>())); | |
| 73 | }; | |
| 74 | ||
| 75 | #else // defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) | |
| 76 | ||
| 77 | template <typename T, typename = void> | |
| 78 | struct equality_comparable_trait : | |
| 79 | conditional< | |
| 80 | is_same<T, typename decay<T>::type>::value, | |
| 81 | no_equality_comparable, | |
| 82 | traits::equality_comparable<typename decay<T>::type> | |
| 83 | >::type | |
| 84 | { | |
| 85 | }; | |
| 86 | ||
| 87 | #endif // defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) | |
| 88 | ||
| 89 | } // namespace detail | |
| 90 | namespace traits { | |
| 91 | ||
| 92 | template <typename T, typename> | |
| 93 | struct equality_comparable_default : detail::equality_comparable_trait<T> | |
| 94 | { | |
| 95 | }; | |
| 96 | ||
| 97 | template <typename T, typename> | |
| 98 | struct equality_comparable : equality_comparable_default<T> | |
| 99 | { | |
| 100 | }; | |
| 101 | ||
| 102 | } // namespace traits | |
| 103 | } // namespace asio | |
| 104 | } // namespace boost | |
| 105 | ||
| 106 | #endif // BOOST_ASIO_TRAITS_EQUALITY_COMPARABLE_HPP |