| // |
| // is_applicable_property.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| |
| #ifndef BOOST_ASIO_IS_APPLICABLE_PROPERTY_HPP |
| #define BOOST_ASIO_IS_APPLICABLE_PROPERTY_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include <boost/asio/detail/config.hpp> |
| #include <boost/asio/detail/type_traits.hpp> |
| |
| namespace boost { |
| namespace asio { |
| namespace detail { |
| |
| template <typename T, typename Property, typename = void> |
| struct is_applicable_property_trait : false_type |
| { |
| }; |
| |
| #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| template <typename T, typename Property> |
| struct is_applicable_property_trait<T, Property, |
| typename void_type< |
| typename enable_if< |
| !!Property::template is_applicable_property_v<T> |
| >::type |
| >::type> : true_type |
| { |
| }; |
| |
| #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| } // namespace detail |
| |
| template <typename T, typename Property, typename = void> |
| struct is_applicable_property : |
| detail::is_applicable_property_trait<T, Property> |
| { |
| }; |
| |
| #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| template <typename T, typename Property> |
| BOOST_ASIO_CONSTEXPR const bool is_applicable_property_v |
| = is_applicable_property<T, Property>::value; |
| |
| #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| } // namespace asio |
| } // namespace boost |
| |
| #endif // BOOST_ASIO_IS_APPLICABLE_PROPERTY_HPP |