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+//
+// query.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_QUERY_HPP
+#define ASIO_QUERY_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/is_applicable_property.hpp"
+#include "asio/traits/query_member.hpp"
+#include "asio/traits/query_free.hpp"
+#include "asio/traits/static_query.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+#if defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+
+/// A customisation point that queries the value of a property.
+/**
+ * The name <tt>query</tt> denotes a customization point object. The
+ * expression <tt>asio::query(E, P)</tt> for some
+ * subexpressions <tt>E</tt> and <tt>P</tt> (with types <tt>T =
+ * decay_t<decltype(E)></tt> and <tt>Prop = decay_t<decltype(P)></tt>) is
+ * expression-equivalent to:
+ *
+ * @li If <tt>is_applicable_property_v<T, Prop></tt> is not a well-formed
+ * constant expression with value <tt>true</tt>, <tt>asio::query(E,
+ * P)</tt> is ill-formed.
+ *
+ * @li Otherwise, <tt>Prop::template static_query_v<T></tt> if the expression
+ * <tt>Prop::template static_query_v<T></tt> is a well-formed constant
+ * expression.
+ *
+ * @li Otherwise, <tt>(E).query(P)</tt> if the expression
+ * <tt>(E).query(P)</tt> is well-formed.
+ *
+ * @li Otherwise, <tt>query(E, P)</tt> if the expression
+ * <tt>query(E, P)</tt> is a valid expression with overload
+ * resolution performed in a context that does not include the declaration
+ * of the <tt>query</tt> customization point object.
+ *
+ * @li Otherwise, <tt>asio::query(E, P)</tt> is ill-formed.
+ */
+inline constexpr unspecified query = unspecified;
+
+/// A type trait that determines whether a @c query expression is well-formed.
+/**
+ * Class template @c can_query is a trait that is derived from
+ * @c true_type if the expression <tt>asio::query(std::declval<T>(),
+ * std::declval<Property>())</tt> is well formed; otherwise @c false_type.
+ */
+template <typename T, typename Property>
+struct can_query :
+ integral_constant<bool, automatically_determined>
+{
+};
+
+/// A type trait that determines whether a @c query expression will
+/// not throw.
+/**
+ * Class template @c is_nothrow_query is a trait that is derived from
+ * @c true_type if the expression <tt>asio::query(std::declval<T>(),
+ * std::declval<Property>())</tt> is @c noexcept; otherwise @c false_type.
+ */
+template <typename T, typename Property>
+struct is_nothrow_query :
+ integral_constant<bool, automatically_determined>
+{
+};
+
+/// A type trait that determines the result type of a @c query expression.
+/**
+ * Class template @c query_result is a trait that determines the result
+ * type of the expression <tt>asio::query(std::declval<T>(),
+ * std::declval<Property>())</tt>.
+ */
+template <typename T, typename Property>
+struct query_result
+{
+ /// The result of the @c query expression.
+ typedef automatically_determined type;
+};
+
+} // namespace asio
+
+#else // defined(GENERATING_DOCUMENTATION)
+
+namespace asio_query_fn {
+
+using asio::conditional_t;
+using asio::decay_t;
+using asio::declval;
+using asio::enable_if_t;
+using asio::is_applicable_property;
+using asio::traits::query_free;
+using asio::traits::query_member;
+using asio::traits::static_query;
+
+void query();
+
+enum overload_type
+{
+ static_value,
+ call_member,
+ call_free,
+ ill_formed
+};
+
+template <typename Impl, typename T, typename Properties,
+ typename = void, typename = void, typename = void, typename = void>
+struct call_traits
+{
+ static constexpr overload_type overload = ill_formed;
+ static constexpr bool is_noexcept = false;
+ typedef void result_type;
+};
+
+template <typename Impl, typename T, typename Property>
+struct call_traits<Impl, T, void(Property),
+ enable_if_t<
+ is_applicable_property<
+ decay_t<T>,
+ decay_t<Property>
+ >::value
+ >,
+ enable_if_t<
+ static_query<T, Property>::is_valid
+ >> :
+ static_query<T, Property>
+{
+ static constexpr overload_type overload = static_value;
+};
+
+template <typename Impl, typename T, typename Property>
+struct call_traits<Impl, T, void(Property),
+ enable_if_t<
+ is_applicable_property<
+ decay_t<T>,
+ decay_t<Property>
+ >::value
+ >,
+ enable_if_t<
+ !static_query<T, Property>::is_valid
+ >,
+ enable_if_t<
+ query_member<typename Impl::template proxy<T>::type, Property>::is_valid
+ >> :
+ query_member<typename Impl::template proxy<T>::type, Property>
+{
+ static constexpr overload_type overload = call_member;
+};
+
+template <typename Impl, typename T, typename Property>
+struct call_traits<Impl, T, void(Property),
+ enable_if_t<
+ is_applicable_property<
+ decay_t<T>,
+ decay_t<Property>
+ >::value
+ >,
+ enable_if_t<
+ !static_query<T, Property>::is_valid
+ >,
+ enable_if_t<
+ !query_member<typename Impl::template proxy<T>::type, Property>::is_valid
+ >,
+ enable_if_t<
+ query_free<T, Property>::is_valid
+ >> :
+ query_free<T, Property>
+{
+ static constexpr overload_type overload = call_free;
+};
+
+struct impl
+{
+ template <typename T>
+ struct proxy
+ {
+#if defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+ struct type
+ {
+ template <typename P>
+ auto query(P&& p)
+ noexcept(
+ noexcept(
+ declval<conditional_t<true, T, P>>().query(static_cast<P&&>(p))
+ )
+ )
+ -> decltype(
+ declval<conditional_t<true, T, P>>().query(static_cast<P&&>(p))
+ );
+ };
+#else // defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+ typedef T type;
+#endif // defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+ };
+
+ template <typename T, typename Property>
+ ASIO_NODISCARD constexpr enable_if_t<
+ call_traits<impl, T, void(Property)>::overload == static_value,
+ typename call_traits<impl, T, void(Property)>::result_type
+ >
+ operator()(T&&, Property&&) const
+ noexcept(call_traits<impl, T, void(Property)>::is_noexcept)
+ {
+ return static_query<decay_t<T>, decay_t<Property>>::value();
+ }
+
+ template <typename T, typename Property>
+ ASIO_NODISCARD constexpr enable_if_t<
+ call_traits<impl, T, void(Property)>::overload == call_member,
+ typename call_traits<impl, T, void(Property)>::result_type
+ >
+ operator()(T&& t, Property&& p) const
+ noexcept(call_traits<impl, T, void(Property)>::is_noexcept)
+ {
+ return static_cast<T&&>(t).query(static_cast<Property&&>(p));
+ }
+
+ template <typename T, typename Property>
+ ASIO_NODISCARD constexpr enable_if_t<
+ call_traits<impl, T, void(Property)>::overload == call_free,
+ typename call_traits<impl, T, void(Property)>::result_type
+ >
+ operator()(T&& t, Property&& p) const
+ noexcept(call_traits<impl, T, void(Property)>::is_noexcept)
+ {
+ return query(static_cast<T&&>(t), static_cast<Property&&>(p));
+ }
+};
+
+template <typename T = impl>
+struct static_instance
+{
+ static const T instance;
+};
+
+template <typename T>
+const T static_instance<T>::instance = {};
+
+} // namespace asio_query_fn
+namespace asio {
+namespace {
+
+static constexpr const asio_query_fn::impl&
+ query = asio_query_fn::static_instance<>::instance;
+
+} // namespace
+
+typedef asio_query_fn::impl query_t;
+
+template <typename T, typename Property>
+struct can_query :
+ integral_constant<bool,
+ asio_query_fn::call_traits<query_t, T, void(Property)>::overload !=
+ asio_query_fn::ill_formed>
+{
+};
+
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T, typename Property>
+constexpr bool can_query_v = can_query<T, Property>::value;
+
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T, typename Property>
+struct is_nothrow_query :
+ integral_constant<bool,
+ asio_query_fn::call_traits<query_t, T, void(Property)>::is_noexcept>
+{
+};
+
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T, typename Property>
+constexpr bool is_nothrow_query_v = is_nothrow_query<T, Property>::value;
+
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T, typename Property>
+struct query_result
+{
+ typedef typename asio_query_fn::call_traits<
+ query_t, T, void(Property)>::result_type type;
+};
+
+template <typename T, typename Property>
+using query_result_t = typename query_result<T, Property>::type;
+
+} // namespace asio
+
+#endif // defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_QUERY_HPP