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+//
+// ip/network_v6.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2014 Oliver Kowalke (oliver dot kowalke at gmail 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_NETWORK_V6_HPP
+#define ASIO_IP_NETWORK_V6_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <string>
+#include "asio/detail/string_view.hpp"
+#include "asio/error_code.hpp"
+#include "asio/ip/address_v6_range.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Represents an IPv6 network.
+/**
+ * The asio::ip::network_v6 class provides the ability to use and
+ * manipulate IP version 6 networks.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+class network_v6
+{
+public:
+ /// Default constructor.
+ network_v6() ASIO_NOEXCEPT
+ : address_(),
+ prefix_length_(0)
+ {
+ }
+
+ /// Construct a network based on the specified address and prefix length.
+ ASIO_DECL network_v6(const address_v6& addr,
+ unsigned short prefix_len);
+
+ /// Copy constructor.
+ network_v6(const network_v6& other) ASIO_NOEXCEPT
+ : address_(other.address_),
+ prefix_length_(other.prefix_length_)
+ {
+ }
+
+#if defined(ASIO_HAS_MOVE)
+ /// Move constructor.
+ network_v6(network_v6&& other) ASIO_NOEXCEPT
+ : address_(ASIO_MOVE_CAST(address_v6)(other.address_)),
+ prefix_length_(other.prefix_length_)
+ {
+ }
+#endif // defined(ASIO_HAS_MOVE)
+
+ /// Assign from another network.
+ network_v6& operator=(const network_v6& other) ASIO_NOEXCEPT
+ {
+ address_ = other.address_;
+ prefix_length_ = other.prefix_length_;
+ return *this;
+ }
+
+#if defined(ASIO_HAS_MOVE)
+ /// Move-assign from another network.
+ network_v6& operator=(network_v6&& other) ASIO_NOEXCEPT
+ {
+ address_ = ASIO_MOVE_CAST(address_v6)(other.address_);
+ prefix_length_ = other.prefix_length_;
+ return *this;
+ }
+#endif // defined(ASIO_HAS_MOVE)
+
+ /// Obtain the address object specified when the network object was created.
+ address_v6 address() const ASIO_NOEXCEPT
+ {
+ return address_;
+ }
+
+ /// Obtain the prefix length that was specified when the network object was
+ /// created.
+ unsigned short prefix_length() const ASIO_NOEXCEPT
+ {
+ return prefix_length_;
+ }
+
+ /// Obtain an address object that represents the network address.
+ ASIO_DECL address_v6 network() const ASIO_NOEXCEPT;
+
+ /// Obtain an address range corresponding to the hosts in the network.
+ ASIO_DECL address_v6_range hosts() const ASIO_NOEXCEPT;
+
+ /// Obtain the true network address, omitting any host bits.
+ network_v6 canonical() const ASIO_NOEXCEPT
+ {
+ return network_v6(network(), prefix_length());
+ }
+
+ /// Test if network is a valid host address.
+ bool is_host() const ASIO_NOEXCEPT
+ {
+ return prefix_length_ == 128;
+ }
+
+ /// Test if a network is a real subnet of another network.
+ ASIO_DECL bool is_subnet_of(const network_v6& other) const;
+
+ /// Get the network as an address in dotted decimal format.
+ ASIO_DECL std::string to_string() const;
+
+ /// Get the network as an address in dotted decimal format.
+ ASIO_DECL std::string to_string(asio::error_code& ec) const;
+
+ /// Compare two networks for equality.
+ friend bool operator==(const network_v6& a, const network_v6& b)
+ {
+ return a.address_ == b.address_ && a.prefix_length_ == b.prefix_length_;
+ }
+
+ /// Compare two networks for inequality.
+ friend bool operator!=(const network_v6& a, const network_v6& b)
+ {
+ return !(a == b);
+ }
+
+private:
+ address_v6 address_;
+ unsigned short prefix_length_;
+};
+
+/// Create an IPv6 network from an address and prefix length.
+/**
+ * @relates address_v6
+ */
+inline network_v6 make_network_v6(
+ const address_v6& addr, unsigned short prefix_len)
+{
+ return network_v6(addr, prefix_len);
+}
+
+/// Create an IPv6 network from a string containing IP address and prefix
+/// length.
+/**
+ * @relates network_v6
+ */
+ASIO_DECL network_v6 make_network_v6(const char* str);
+
+/// Create an IPv6 network from a string containing IP address and prefix
+/// length.
+/**
+ * @relates network_v6
+ */
+ASIO_DECL network_v6 make_network_v6(
+ const char* str, asio::error_code& ec);
+
+/// Create an IPv6 network from a string containing IP address and prefix
+/// length.
+/**
+ * @relates network_v6
+ */
+ASIO_DECL network_v6 make_network_v6(const std::string& str);
+
+/// Create an IPv6 network from a string containing IP address and prefix
+/// length.
+/**
+ * @relates network_v6
+ */
+ASIO_DECL network_v6 make_network_v6(
+ const std::string& str, asio::error_code& ec);
+
+#if defined(ASIO_HAS_STRING_VIEW) \
+ || defined(GENERATING_DOCUMENTATION)
+
+/// Create an IPv6 network from a string containing IP address and prefix
+/// length.
+/**
+ * @relates network_v6
+ */
+ASIO_DECL network_v6 make_network_v6(string_view str);
+
+/// Create an IPv6 network from a string containing IP address and prefix
+/// length.
+/**
+ * @relates network_v6
+ */
+ASIO_DECL network_v6 make_network_v6(
+ string_view str, asio::error_code& ec);
+
+#endif // defined(ASIO_HAS_STRING_VIEW)
+ // || defined(GENERATING_DOCUMENTATION)
+
+#if !defined(ASIO_NO_IOSTREAM)
+
+/// Output a network as a string.
+/**
+ * Used to output a human-readable string for a specified network.
+ *
+ * @param os The output stream to which the string will be written.
+ *
+ * @param net The network to be written.
+ *
+ * @return The output stream.
+ *
+ * @relates asio::ip::address_v6
+ */
+template <typename Elem, typename Traits>
+std::basic_ostream<Elem, Traits>& operator<<(
+ std::basic_ostream<Elem, Traits>& os, const network_v6& net);
+
+#endif // !defined(ASIO_NO_IOSTREAM)
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/ip/impl/network_v6.hpp"
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/ip/impl/network_v6.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_IP_NETWORK_V6_HPP