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1 | // |
2 | // traits/query_static_constexpr_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_QUERY_STATIC_CONSTEXPR_MEMBER_HPP | |
12 | #define BOOST_ASIO_TRAITS_QUERY_STATIC_CONSTEXPR_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_CONSTEXPR) \ | |
24 | && defined(BOOST_ASIO_HAS_CONSTANT_EXPRESSION_SFINAE) \ | |
25 | && defined(BOOST_ASIO_HAS_WORKING_EXPRESSION_SFINAE) | |
26 | # define BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT 1 | |
27 | #endif // defined(BOOST_ASIO_HAS_DECLTYPE) | |
28 | // && defined(BOOST_ASIO_HAS_NOEXCEPT) | |
29 | // && defined(BOOST_ASIO_HAS_CONSTEXPR) | |
30 | // && defined(BOOST_ASIO_HAS_CONSTANT_EXPRESSION_SFINAE) | |
31 | // && defined(BOOST_ASIO_HAS_WORKING_EXPRESSION_SFINAE) | |
32 | ||
33 | #include <boost/asio/detail/push_options.hpp> | |
34 | ||
35 | namespace boost { | |
36 | namespace asio { | |
37 | namespace traits { | |
38 | ||
39 | template <typename T, typename Property, typename = void> | |
40 | struct query_static_constexpr_member_default; | |
41 | ||
42 | template <typename T, typename Property, typename = void> | |
43 | struct query_static_constexpr_member; | |
44 | ||
45 | } // namespace traits | |
46 | namespace detail { | |
47 | ||
48 | struct no_query_static_constexpr_member | |
49 | { | |
50 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = false); | |
51 | }; | |
52 | ||
53 | template <typename T, typename Property, typename = void> | |
54 | struct query_static_constexpr_member_trait : | |
55 | conditional< | |
56 | is_same<T, typename decay<T>::type>::value | |
57 | && is_same<Property, typename decay<Property>::type>::value, | |
58 | no_query_static_constexpr_member, | |
59 | traits::query_static_constexpr_member< | |
60 | typename decay<T>::type, | |
61 | typename decay<Property>::type> | |
62 | >::type | |
63 | { | |
64 | }; | |
65 | ||
66 | #if defined(BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) | |
67 | ||
68 | template <typename T, typename Property> | |
69 | struct query_static_constexpr_member_trait<T, Property, | |
70 | typename enable_if< | |
71 | (static_cast<void>(T::query(Property{})), true) | |
72 | >::type> | |
73 | { | |
74 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
75 | ||
76 | using result_type = decltype(T::query(Property{})); | |
77 | ||
78 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = | |
79 | noexcept(T::query(Property{}))); | |
80 | ||
81 | static BOOST_ASIO_CONSTEXPR result_type value() noexcept(is_noexcept) | |
82 | { | |
83 | return T::query(Property{}); | |
84 | } | |
85 | }; | |
86 | ||
87 | #endif // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) | |
88 | ||
89 | } // namespace detail | |
90 | namespace traits { | |
91 | ||
92 | template <typename T, typename Property, typename> | |
93 | struct query_static_constexpr_member_default : | |
94 | detail::query_static_constexpr_member_trait<T, Property> | |
95 | { | |
96 | }; | |
97 | ||
98 | template <typename T, typename Property, typename> | |
99 | struct query_static_constexpr_member : | |
100 | query_static_constexpr_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_QUERY_STATIC_CONSTEXPR_MEMBER_HPP |