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+//
+// ip/v6_only.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_IP_V6_ONLY_HPP
+#define ASIO_IP_V6_ONLY_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/socket_option.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Socket option for determining whether an IPv6 socket supports IPv6
+/// communication only.
+/**
+ * Implements the IPPROTO_IPV6/IPV6_V6ONLY socket option.
+ *
+ * @par Examples
+ * Setting the option:
+ * @code
+ * asio::ip::tcp::socket socket(my_context);
+ * ...
+ * asio::ip::v6_only option(true);
+ * socket.set_option(option);
+ * @endcode
+ *
+ * @par
+ * Getting the current option value:
+ * @code
+ * asio::ip::tcp::socket socket(my_context);
+ * ...
+ * asio::ip::v6_only option;
+ * socket.get_option(option);
+ * bool v6_only = option.value();
+ * @endcode
+ *
+ * @par Concepts:
+ * GettableSocketOption, SettableSocketOption.
+ */
+#if defined(GENERATING_DOCUMENTATION)
+typedef implementation_defined v6_only;
+#elif defined(IPV6_V6ONLY)
+typedef asio::detail::socket_option::boolean<
+ IPPROTO_IPV6, IPV6_V6ONLY> v6_only;
+#else
+typedef asio::detail::socket_option::boolean<
+ asio::detail::custom_socket_option_level,
+ asio::detail::always_fail_option> v6_only;
+#endif
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_V6_ONLY_HPP