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1 | // |
2 | // is_applicable_property.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
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_IS_APPLICABLE_PROPERTY_HPP | |
12 | #define BOOST_ASIO_IS_APPLICABLE_PROPERTY_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 | namespace boost { | |
22 | namespace asio { | |
23 | namespace detail { | |
24 | ||
25 | template <typename T, typename Property, typename = void> | |
26 | struct is_applicable_property_trait : false_type | |
27 | { | |
28 | }; | |
29 | ||
30 | #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
31 | ||
32 | template <typename T, typename Property> | |
33 | struct is_applicable_property_trait<T, Property, | |
34 | typename void_type< | |
35 | typename enable_if< | |
36 | !!Property::template is_applicable_property_v<T> | |
37 | >::type | |
38 | >::type> : true_type | |
39 | { | |
40 | }; | |
41 | ||
42 | #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
43 | ||
44 | } // namespace detail | |
45 | ||
46 | template <typename T, typename Property, typename = void> | |
47 | struct is_applicable_property : | |
48 | detail::is_applicable_property_trait<T, Property> | |
49 | { | |
50 | }; | |
51 | ||
52 | #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
53 | ||
54 | template <typename T, typename Property> | |
55 | BOOST_ASIO_CONSTEXPR const bool is_applicable_property_v | |
56 | = is_applicable_property<T, Property>::value; | |
57 | ||
58 | #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
59 | ||
60 | } // namespace asio | |
61 | } // namespace boost | |
62 | ||
63 | #endif // BOOST_ASIO_IS_APPLICABLE_PROPERTY_HPP |