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diff --git a/3rdparty/asio/include/asio/traits/prefer_free.hpp b/3rdparty/asio/include/asio/traits/prefer_free.hpp
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+//
+// traits/prefer_free.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_TRAITS_PREFER_FREE_HPP
+#define ASIO_TRAITS_PREFER_FREE_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_DECLTYPE) \
+ && defined(ASIO_HAS_NOEXCEPT) \
+ && defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
+# define ASIO_HAS_DEDUCED_PREFER_FREE_TRAIT 1
+#endif // defined(ASIO_HAS_DECLTYPE)
+ // && defined(ASIO_HAS_NOEXCEPT)
+ // && defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace traits {
+
+template <typename T, typename Property, typename = void>
+struct prefer_free_default;
+
+template <typename T, typename Property, typename = void>
+struct prefer_free;
+
+} // namespace traits
+namespace detail {
+
+struct no_prefer_free
+{
+ ASIO_STATIC_CONSTEXPR(bool, is_valid = false);
+ ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
+};
+
+#if defined(ASIO_HAS_DEDUCED_PREFER_FREE_TRAIT)
+
+template <typename T, typename Property, typename = void>
+struct prefer_free_trait : no_prefer_free
+{
+};
+
+template <typename T, typename Property>
+struct prefer_free_trait<T, Property,
+ typename void_type<
+ decltype(prefer(declval<T>(), declval<Property>()))
+ >::type>
+{
+ ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
+
+ using result_type = decltype(
+ prefer(declval<T>(), declval<Property>()));
+
+ ASIO_STATIC_CONSTEXPR(bool, is_noexcept = noexcept(
+ prefer(declval<T>(), declval<Property>())));
+};
+
+#else // defined(ASIO_HAS_DEDUCED_PREFER_FREE_TRAIT)
+
+template <typename T, typename Property, typename = void>
+struct prefer_free_trait :
+ conditional<
+ is_same<T, typename decay<T>::type>::value
+ && is_same<Property, typename decay<Property>::type>::value,
+ no_prefer_free,
+ traits::prefer_free<
+ typename decay<T>::type,
+ typename decay<Property>::type>
+ >::type
+{
+};
+
+#endif // defined(ASIO_HAS_DEDUCED_PREFER_FREE_TRAIT)
+
+} // namespace detail
+namespace traits {
+
+template <typename T, typename Property, typename>
+struct prefer_free_default :
+ detail::prefer_free_trait<T, Property>
+{
+};
+
+template <typename T, typename Property, typename>
+struct prefer_free :
+ prefer_free_default<T, Property>
+{
+};
+
+} // namespace traits
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_TRAITS_PREFER_FREE_HPP