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+//
+// traits/static_require_concept.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_STATIC_REQUIRE_CONCEPT_HPP
+#define ASIO_TRAITS_STATIC_REQUIRE_CONCEPT_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"
+#include "asio/traits/static_query.hpp"
+
+#define ASIO_HAS_DEDUCED_STATIC_REQUIRE_CONCEPT_TRAIT 1
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace traits {
+
+template <typename T, typename Property, typename = void>
+struct static_require_concept_default;
+
+template <typename T, typename Property, typename = void>
+struct static_require_concept;
+
+} // namespace traits
+namespace detail {
+
+struct no_static_require_concept
+{
+ static constexpr bool is_valid = false;
+};
+
+template <typename T, typename Property, typename = void>
+struct static_require_concept_trait :
+ conditional_t<
+ is_same<T, decay_t<T>>::value
+ && is_same<Property, decay_t<Property>>::value,
+ no_static_require_concept,
+ traits::static_require_concept<
+ decay_t<T>,
+ decay_t<Property>>
+ >
+{
+};
+
+#if defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
+
+template <typename T, typename Property>
+struct static_require_concept_trait<T, Property,
+ enable_if_t<
+ decay_t<Property>::value() == traits::static_query<T, Property>::value()
+ >>
+{
+ static constexpr bool is_valid = true;
+};
+
+#else // defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
+
+false_type static_require_concept_test(...);
+
+template <typename T, typename Property>
+true_type static_require_concept_test(T*, Property*,
+ enable_if_t<
+ Property::value() == traits::static_query<T, Property>::value()
+ >* = 0);
+
+template <typename T, typename Property>
+struct has_static_require_concept
+{
+ static constexpr bool value =
+ decltype((static_require_concept_test)(
+ static_cast<T*>(0), static_cast<Property*>(0)))::value;
+};
+
+template <typename T, typename Property>
+struct static_require_concept_trait<T, Property,
+ enable_if_t<
+ has_static_require_concept<decay_t<T>,
+ decay_t<Property>>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+};
+
+#endif // defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
+
+} // namespace detail
+namespace traits {
+
+template <typename T, typename Property, typename>
+struct static_require_concept_default :
+ detail::static_require_concept_trait<T, Property>
+{
+};
+
+template <typename T, typename Property, typename>
+struct static_require_concept : static_require_concept_default<T, Property>
+{
+};
+
+} // namespace traits
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_TRAITS_STATIC_REQUIRE_CONCEPT_HPP