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+//
+// detail/type_traits.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 ASIO_DETAIL_TYPE_TRAITS_HPP
+#define ASIO_DETAIL_TYPE_TRAITS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_HAS_STD_TYPE_TRAITS)
+# include <type_traits>
+#else // defined(ASIO_HAS_STD_TYPE_TRAITS)
+# include <boost/type_traits/add_const.hpp>
+# include <boost/type_traits/add_lvalue_reference.hpp>
+# include <boost/type_traits/aligned_storage.hpp>
+# include <boost/type_traits/alignment_of.hpp>
+# include <boost/type_traits/conditional.hpp>
+# include <boost/type_traits/decay.hpp>
+# include <boost/type_traits/has_nothrow_copy.hpp>
+# include <boost/type_traits/has_nothrow_destructor.hpp>
+# include <boost/type_traits/integral_constant.hpp>
+# include <boost/type_traits/is_base_of.hpp>
+# include <boost/type_traits/is_class.hpp>
+# include <boost/type_traits/is_const.hpp>
+# include <boost/type_traits/is_convertible.hpp>
+# include <boost/type_traits/is_constructible.hpp>
+# include <boost/type_traits/is_copy_constructible.hpp>
+# include <boost/type_traits/is_destructible.hpp>
+# include <boost/type_traits/is_function.hpp>
+# include <boost/type_traits/is_object.hpp>
+# include <boost/type_traits/is_same.hpp>
+# include <boost/type_traits/remove_cv.hpp>
+# include <boost/type_traits/remove_pointer.hpp>
+# include <boost/type_traits/remove_reference.hpp>
+# include <boost/utility/declval.hpp>
+# include <boost/utility/enable_if.hpp>
+# include <boost/utility/result_of.hpp>
+#endif // defined(ASIO_HAS_STD_TYPE_TRAITS)
+
+namespace asio {
+
+#if defined(ASIO_HAS_STD_TYPE_TRAITS)
+using std::add_const;
+using std::add_lvalue_reference;
+using std::aligned_storage;
+using std::alignment_of;
+using std::conditional;
+using std::decay;
+using std::declval;
+using std::enable_if;
+using std::false_type;
+using std::integral_constant;
+using std::is_base_of;
+using std::is_class;
+using std::is_const;
+using std::is_constructible;
+using std::is_convertible;
+using std::is_copy_constructible;
+using std::is_destructible;
+using std::is_function;
+using std::is_move_constructible;
+using std::is_nothrow_copy_constructible;
+using std::is_nothrow_destructible;
+using std::is_object;
+using std::is_reference;
+using std::is_same;
+using std::is_scalar;
+using std::remove_cv;
+template <typename T>
+struct remove_cvref : remove_cv<typename std::remove_reference<T>::type> {};
+using std::remove_pointer;
+using std::remove_reference;
+#if defined(ASIO_HAS_STD_INVOKE_RESULT)
+template <typename> struct result_of;
+template <typename F, typename... Args>
+struct result_of<F(Args...)> : std::invoke_result<F, Args...> {};
+#else // defined(ASIO_HAS_STD_INVOKE_RESULT)
+using std::result_of;
+#endif // defined(ASIO_HAS_STD_INVOKE_RESULT)
+using std::true_type;
+#else // defined(ASIO_HAS_STD_TYPE_TRAITS)
+using boost::add_const;
+using boost::add_lvalue_reference;
+using boost::aligned_storage;
+using boost::alignment_of;
+template <bool Condition, typename Type = void>
+struct enable_if : boost::enable_if_c<Condition, Type> {};
+using boost::conditional;
+using boost::decay;
+using boost::declval;
+using boost::false_type;
+using boost::integral_constant;
+using boost::is_base_of;
+using boost::is_class;
+using boost::is_const;
+using boost::is_constructible;
+using boost::is_convertible;
+using boost::is_copy_constructible;
+using boost::is_destructible;
+using boost::is_function;
+#if defined(ASIO_HAS_MOVE)
+template <typename T>
+struct is_move_constructible : false_type {};
+#else // defined(ASIO_HAS_MOVE)
+template <typename T>
+struct is_move_constructible : is_copy_constructible<T> {};
+#endif // defined(ASIO_HAS_MOVE)
+template <typename T>
+struct is_nothrow_copy_constructible : boost::has_nothrow_copy<T> {};
+template <typename T>
+struct is_nothrow_destructible : boost::has_nothrow_destructor<T> {};
+using boost::is_object;
+using boost::is_reference;
+using boost::is_same;
+using boost::is_scalar;
+using boost::remove_cv;
+template <typename T>
+struct remove_cvref : remove_cv<typename boost::remove_reference<T>::type> {};
+using boost::remove_pointer;
+using boost::remove_reference;
+using boost::result_of;
+using boost::true_type;
+#endif // defined(ASIO_HAS_STD_TYPE_TRAITS)
+
+template <typename> struct void_type { typedef void type; };
+
+#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
+
+template <typename...> struct conjunction : true_type {};
+template <typename T> struct conjunction<T> : T {};
+template <typename Head, typename... Tail> struct conjunction<Head, Tail...> :
+ conditional<Head::value, conjunction<Tail...>, Head>::type {};
+
+#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+
+struct defaulted_constraint
+{
+ ASIO_CONSTEXPR defaulted_constraint() {}
+};
+
+template <bool Condition, typename Type = int>
+struct constraint : enable_if<Condition, Type> {};
+
+} // namespace asio
+
+#endif // ASIO_DETAIL_TYPE_TRAITS_HPP