boost/asio/is_applicable_property.hpp

0001 //
0002 // is_applicable_property.hpp
0003 // ~~~~~~~~~~~~~~~~~~~~~~~~~~
0004 //
0005 // Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0009 //
0010
0011 #ifndef BOOST_ASIO_IS_APPLICABLE_PROPERTY_HPP
0012 #define BOOST_ASIO_IS_APPLICABLE_PROPERTY_HPP
0013
0014 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
0015 # pragma once
0016 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
0017
0018 #include <boost/asio/detail/config.hpp>
0019 #include <boost/asio/detail/type_traits.hpp>
0020
0021 namespace boost {
0022 namespace asio {
0023 namespace detail {
0024
0025 template <typename T, typename Property, typename = void>
0026 struct is_applicable_property_trait : false_type
0027 {
0028 };
0029
0030 #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
0031
0032 template <typename T, typename Property>
0033 struct is_applicable_property_trait<T, Property,
0034   void_t<
0035     enable_if_t<
0036       !!Property::template is_applicable_property_v<T>
0037     >
0038   >> : true_type
0039 {
0040 };
0041
0042 #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
0043
0044 } // namespace detail
0045
0046 template <typename T, typename Property, typename = void>
0047 struct is_applicable_property :
0048   detail::is_applicable_property_trait<T, Property>
0049 {
0050 };
0051
0052 #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
0053
0054 template <typename T, typename Property>
0055 constexpr const bool is_applicable_property_v
0056   = is_applicable_property<T, Property>::value;
0057
0058 #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
0059
0060 } // namespace asio
0061 } // namespace boost
0062
0063 #endif // BOOST_ASIO_IS_APPLICABLE_PROPERTY_HPP