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+//
+// traits/require_concept_member.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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 ASIO_TRAITS_REQUIRE_CONCEPT_MEMBER_HPP
+#define ASIO_TRAITS_REQUIRE_CONCEPT_MEMBER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/type_traits.hpp"
+
+#if defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
+# define ASIO_HAS_DEDUCED_REQUIRE_CONCEPT_MEMBER_TRAIT 1
+#endif // defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace traits {
+
+template <typename T, typename Property, typename = void>
+struct require_concept_member_default;
+
+template <typename T, typename Property, typename = void>
+struct require_concept_member;
+
+} // namespace traits
+namespace detail {
+
+struct no_require_concept_member
+{
+ static constexpr bool is_valid = false;
+ static constexpr bool is_noexcept = false;
+};
+
+#if defined(ASIO_HAS_DEDUCED_REQUIRE_CONCEPT_MEMBER_TRAIT)
+
+template <typename T, typename Property, typename = void>
+struct require_concept_member_trait : no_require_concept_member
+{
+};
+
+template <typename T, typename Property>
+struct require_concept_member_trait<T, Property,
+ void_t<
+ decltype(declval<T>().require_concept(declval<Property>()))
+ >>
+{
+ static constexpr bool is_valid = true;
+
+ using result_type = decltype(
+ declval<T>().require_concept(declval<Property>()));
+
+ static constexpr bool is_noexcept =
+ noexcept(declval<T>().require_concept(declval<Property>()));
+};
+
+#else // defined(ASIO_HAS_DEDUCED_REQUIRE_CONCEPT_MEMBER_TRAIT)
+
+template <typename T, typename Property, typename = void>
+struct require_concept_member_trait :
+ conditional_t<
+ is_same<T, decay_t<T>>::value
+ && is_same<Property, decay_t<Property>>::value,
+ no_require_concept_member,
+ traits::require_concept_member<
+ decay_t<T>,
+ decay_t<Property>>
+ >
+{
+};
+
+#endif // defined(ASIO_HAS_DEDUCED_REQUIRE_CONCEPT_MEMBER_TRAIT)
+
+} // namespace detail
+namespace traits {
+
+template <typename T, typename Property, typename>
+struct require_concept_member_default :
+ detail::require_concept_member_trait<T, Property>
+{
+};
+
+template <typename T, typename Property, typename>
+struct require_concept_member :
+ require_concept_member_default<T, Property>
+{
+};
+
+} // namespace traits
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_TRAITS_REQUIRE_CONCEPT_MEMBER_HPP