projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 20effc67 TL |
1 | // |
| 2 | // traits/prefer_member.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_PREFER_MEMBER_HPP | |
| 12 | #define BOOST_ASIO_TRAITS_PREFER_MEMBER_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_PREFER_MEMBER_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 | #include <boost/asio/detail/push_options.hpp> | |
| 30 | ||
| 31 | namespace boost { | |
| 32 | namespace asio { | |
| 33 | namespace traits { | |
| 34 | ||
| 35 | template <typename T, typename Property, typename = void> | |
| 36 | struct prefer_member_default; | |
| 37 | ||
| 38 | template <typename T, typename Property, typename = void> | |
| 39 | struct prefer_member; | |
| 40 | ||
| 41 | } // namespace traits | |
| 42 | namespace detail { | |
| 43 | ||
| 44 | struct no_prefer_member | |
| 45 | { | |
| 46 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = false); | |
| 47 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); | |
| 48 | }; | |
| 49 | ||
| 50 | #if defined(BOOST_ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) | |
| 51 | ||
| 52 | template <typename T, typename Property, typename = void> | |
| 53 | struct prefer_member_trait : no_prefer_member | |
| 54 | { | |
| 55 | }; | |
| 56 | ||
| 57 | template <typename T, typename Property> | |
| 58 | struct prefer_member_trait<T, Property, | |
| 59 | typename void_type< | |
| 60 | decltype(declval<T>().prefer(declval<Property>())) | |
| 61 | >::type> | |
| 62 | { | |
| 63 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
| 64 | ||
| 65 | using result_type = decltype( | |
| 66 | declval<T>().prefer(declval<Property>())); | |
| 67 | ||
| 68 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = noexcept( | |
| 69 | declval<T>().prefer(declval<Property>()))); | |
| 70 | }; | |
| 71 | ||
| 72 | #else // defined(BOOST_ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) | |
| 73 | ||
| 74 | template <typename T, typename Property, typename = void> | |
| 75 | struct prefer_member_trait : | |
| 76 | conditional< | |
| 77 | is_same<T, typename decay<T>::type>::value | |
| 78 | && is_same<Property, typename decay<Property>::type>::value, | |
| 79 | no_prefer_member, | |
| 80 | traits::prefer_member< | |
| 81 | typename decay<T>::type, | |
| 82 | typename decay<Property>::type> | |
| 83 | >::type | |
| 84 | { | |
| 85 | }; | |
| 86 | ||
| 87 | #endif // defined(BOOST_ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) | |
| 88 | ||
| 89 | } // namespace detail | |
| 90 | namespace traits { | |
| 91 | ||
| 92 | template <typename T, typename Property, typename> | |
| 93 | struct prefer_member_default : | |
| 94 | detail::prefer_member_trait<T, Property> | |
| 95 | { | |
| 96 | }; | |
| 97 | ||
| 98 | template <typename T, typename Property, typename> | |
| 99 | struct prefer_member : | |
| 100 | prefer_member_default<T, Property> | |
| 101 | { | |
| 102 | }; | |
| 103 | ||
| 104 | } // namespace traits | |
| 105 | } // namespace asio | |
| 106 | } // namespace boost | |
| 107 | ||
| 108 | #include <boost/asio/detail/pop_options.hpp> | |
| 109 | ||
| 110 | #endif // BOOST_ASIO_TRAITS_PREFER_MEMBER_HPP |