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diff --git a/lib/asio/ip/network_v4.hpp b/lib/asio/ip/network_v4.hpp
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-//
-// ip/network_v4.hpp
-// ~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 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_V4_HPP
-#define ASIO_IP_NETWORK_V4_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_v4_range.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace ip {
-
-/// Represents an IPv4 network.
-/**
- * The asio::ip::network_v4 class provides the ability to use and
- * manipulate IP version 4 networks.
- *
- * @par Thread Safety
- * @e Distinct @e objects: Safe.@n
- * @e Shared @e objects: Unsafe.
- */
-class network_v4
-{
-public:
- /// Default constructor.
- network_v4() ASIO_NOEXCEPT
- : address_(),
- prefix_length_(0)
- {
- }
-
- /// Construct a network based on the specified address and prefix length.
- ASIO_DECL network_v4(const address_v4& addr,
- unsigned short prefix_len);
-
- /// Construct network based on the specified address and netmask.
- ASIO_DECL network_v4(const address_v4& addr,
- const address_v4& mask);
-
- /// Copy constructor.
- network_v4(const network_v4& other) ASIO_NOEXCEPT
- : address_(other.address_),
- prefix_length_(other.prefix_length_)
- {
- }
-
-#if defined(ASIO_HAS_MOVE)
- /// Move constructor.
- network_v4(network_v4&& other) ASIO_NOEXCEPT
- : address_(ASIO_MOVE_CAST(address_v4)(other.address_)),
- prefix_length_(other.prefix_length_)
- {
- }
-#endif // defined(ASIO_HAS_MOVE)
-
- /// Assign from another network.
- network_v4& operator=(const network_v4& other) ASIO_NOEXCEPT
- {
- address_ = other.address_;
- prefix_length_ = other.prefix_length_;
- return *this;
- }
-
-#if defined(ASIO_HAS_MOVE)
- /// Move-assign from another network.
- network_v4& operator=(network_v4&& other) ASIO_NOEXCEPT
- {
- address_ = ASIO_MOVE_CAST(address_v4)(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_v4 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 the netmask that was specified when the network object was created.
- ASIO_DECL address_v4 netmask() const ASIO_NOEXCEPT;
-
- /// Obtain an address object that represents the network address.
- address_v4 network() const ASIO_NOEXCEPT
- {
- return address_v4(address_.to_uint() & netmask().to_uint());
- }
-
- /// Obtain an address object that represents the network's broadcast address.
- address_v4 broadcast() const ASIO_NOEXCEPT
- {
- return address_v4(network().to_uint() | (netmask().to_uint() ^ 0xFFFFFFFF));
- }
-
- /// Obtain an address range corresponding to the hosts in the network.
- ASIO_DECL address_v4_range hosts() const ASIO_NOEXCEPT;
-
- /// Obtain the true network address, omitting any host bits.
- network_v4 canonical() const ASIO_NOEXCEPT
- {
- return network_v4(network(), netmask());
- }
-
- /// Test if network is a valid host address.
- bool is_host() const ASIO_NOEXCEPT
- {
- return prefix_length_ == 32;
- }
-
- /// Test if a network is a real subnet of another network.
- ASIO_DECL bool is_subnet_of(const network_v4& 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_v4& a, const network_v4& b)
- {
- return a.address_ == b.address_ && a.prefix_length_ == b.prefix_length_;
- }
-
- /// Compare two networks for inequality.
- friend bool operator!=(const network_v4& a, const network_v4& b)
- {
- return !(a == b);
- }
-
-private:
- address_v4 address_;
- unsigned short prefix_length_;
-};
-
-/// Create an IPv4 network from an address and prefix length.
-/**
- * @relates address_v4
- */
-inline network_v4 make_network_v4(
- const address_v4& addr, unsigned short prefix_len)
-{
- return network_v4(addr, prefix_len);
-}
-
-/// Create an IPv4 network from an address and netmask.
-/**
- * @relates address_v4
- */
-inline network_v4 make_network_v4(
- const address_v4& addr, const address_v4& mask)
-{
- return network_v4(addr, mask);
-}
-
-/// Create an IPv4 network from a string containing IP address and prefix
-/// length.
-/**
- * @relates network_v4
- */
-ASIO_DECL network_v4 make_network_v4(const char* str);
-
-/// Create an IPv4 network from a string containing IP address and prefix
-/// length.
-/**
- * @relates network_v4
- */
-ASIO_DECL network_v4 make_network_v4(
- const char* str, asio::error_code& ec);
-
-/// Create an IPv4 network from a string containing IP address and prefix
-/// length.
-/**
- * @relates network_v4
- */
-ASIO_DECL network_v4 make_network_v4(const std::string& str);
-
-/// Create an IPv4 network from a string containing IP address and prefix
-/// length.
-/**
- * @relates network_v4
- */
-ASIO_DECL network_v4 make_network_v4(
- const std::string& str, asio::error_code& ec);
-
-#if defined(ASIO_HAS_STRING_VIEW) \
- || defined(GENERATING_DOCUMENTATION)
-
-/// Create an IPv4 network from a string containing IP address and prefix
-/// length.
-/**
- * @relates network_v4
- */
-ASIO_DECL network_v4 make_network_v4(string_view str);
-
-/// Create an IPv4 network from a string containing IP address and prefix
-/// length.
-/**
- * @relates network_v4
- */
-ASIO_DECL network_v4 make_network_v4(
- 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_v4
- */
-template <typename Elem, typename Traits>
-std::basic_ostream<Elem, Traits>& operator<<(
- std::basic_ostream<Elem, Traits>& os, const network_v4& net);
-
-#endif // !defined(ASIO_NO_IOSTREAM)
-
-} // namespace ip
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#include "asio/ip/impl/network_v4.hpp"
-#if defined(ASIO_HEADER_ONLY)
-# include "asio/ip/impl/network_v4.ipp"
-#endif // defined(ASIO_HEADER_ONLY)
-
-#endif // ASIO_IP_NETWORK_V4_HPP