text: //
  // network_v6.cpp
  // ~~~~~~~~~~~~~~
  //
  // 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)
  //
  
  // Disable autolinking for unit tests.
  #if !defined(BOOST_ALL_NO_LIB)
  #define BOOST_ALL_NO_LIB 1
  #endif // !defined(BOOST_ALL_NO_LIB)
  
  // Test that header file is self-contained.
  #include "asio/ip/network_v6.hpp"
  
  #include "../unit_test.hpp"
  #include <sstream>
  
  //------------------------------------------------------------------------------
  
  // ip_network_v6_compile test
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~
  // The following test checks that all public member functions on the class
  // ip::network_v6 compile and link correctly. Runtime failures are ignored.
  
  namespace ip_network_v6_compile {
  
  void test()
  {
    using namespace asio;
    namespace ip = asio::ip;
  
    try
    {
      asio::error_code ec;
  
      // network_v6 constructors.
  
      ip::network_v6 net1(ip::make_address_v6("2001:370::10:7344"), 64);
      ip::network_v6 net2(ip::make_address_v6("2001:370::10:7345"), 96);
  
      // network_v6 functions.
  
      ip::address_v6 addr1 = net1.address();
      (void)addr1;
  
      unsigned short prefix_len = net1.prefix_length();
      (void)prefix_len;
  
      ip::address_v6 addr3 = net1.network();
      (void)addr3;
  
      ip::address_v6_range hosts = net1.hosts();
      (void)hosts;
  
      ip::network_v6 net3 = net1.canonical();
      (void)net3;
  
      bool b1 = net1.is_host();
      (void)b1;
  
      bool b2 = net1.is_subnet_of(net2);
      (void)b2;
  
      std::string s1 = net1.to_string();
      (void)s1;
  
      std::string s2 = net1.to_string(ec);
      (void)s2;
  
      // network_v6 comparisons.
  
      bool b3 = (net1 == net2);
      (void)b3;
  
      bool b4 = (net1 != net2);
      (void)b4;
  
      // network_v6 creation functions.
  
      net1 = ip::make_network_v6(ip::address_v6(), 24);
      net1 = ip::make_network_v6("10.0.0.0/8");
      net1 = ip::make_network_v6("10.0.0.0/8", ec);
      net1 = ip::make_network_v6(s1);
      net1 = ip::make_network_v6(s1, ec);
  #if defined(ASIO_HAS_STRING_VIEW)
  # if defined(ASIO_HAS_STD_STRING_VIEW)
      std::string_view string_view_value("0::0/8");
  # elif defined(ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW)
      std::experimental::string_view string_view_value("0::0/8");
  # endif // defined(ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW)
      net1 = ip::make_network_v6(string_view_value);
      net1 = ip::make_network_v6(string_view_value, ec);
  #endif // defined(ASIO_STD_STRING_VIEW)
  
      // network_v6 I/O.
  
      std::ostringstream os;
      os << net1;
  
  #if !defined(BOOST_NO_STD_WSTREAMBUF)
      std::wostringstream wos;
      wos << net1;
  #endif // !defined(BOOST_NO_STD_WSTREAMBUF)
    }
    catch (std::exception&)
    {
    }
  }
  
  } // namespace ip_network_v6_compile
  
  //------------------------------------------------------------------------------
  
  // ip_network_v6_runtime test
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~
  // The following test checks that the various public member functions meet the
  // necessary postconditions.
  
  namespace ip_network_v6_runtime {
  
  void test()
  {
    using asio::ip::address_v6;
    using asio::ip::make_address_v6;
    using asio::ip::network_v6;
    using asio::ip::make_network_v6;
  
    address_v6 addr = make_address_v6("2001:370::10:7344");
  
    std::string msg;
    try
    {
      make_network_v6(addr, 129);
    }
    catch(std::out_of_range& ex)
    {
      msg = ex.what();
    }
    ASIO_CHECK(msg == std::string("prefix length too large"));
  
    // construct address range from address and prefix length
    ASIO_CHECK(network_v6(make_address_v6("2001:370::10:7344"), 128).network() == make_address_v6("2001:370::10:7344"));
    ASIO_CHECK(network_v6(make_address_v6("2001:370::10:7344"), 64).network() == make_address_v6("2001:370::"));
    ASIO_CHECK(network_v6(make_address_v6("2001:370::10:7344"), 27).network() == make_address_v6("2001:360::"));
  
    // construct address range from string in CIDR notation
    ASIO_CHECK(make_network_v6("2001:370::10:7344/128").network() == make_address_v6("2001:370::10:7344"));
    ASIO_CHECK(make_network_v6("2001:370::10:7344/64").network() == make_address_v6("2001:370::"));
    ASIO_CHECK(make_network_v6("2001:370::10:7344/27").network() == make_address_v6("2001:360::"));
  
    // construct network from invalid string
    asio::error_code ec;
    make_network_v6("a:b/24", ec);
    ASIO_CHECK(!!ec);
    make_network_v6("2001:370::10:7344/129", ec);
    ASIO_CHECK(!!ec);
    make_network_v6("2001:370::10:7344/-1", ec);
    ASIO_CHECK(!!ec);
    make_network_v6("2001:370::10:7344/", ec);
    ASIO_CHECK(!!ec);
    make_network_v6("2001:370::10:7344", ec);
    ASIO_CHECK(!!ec);
  
    // prefix length
    ASIO_CHECK(make_network_v6("2001:370::10:7344/128").prefix_length() == 128);
    ASIO_CHECK(network_v6(make_address_v6("2001:370::10:7344"), 27).prefix_length() == 27);
  
    // to string
    std::string a("2001:370::10:7344/64");
    ASIO_CHECK(make_network_v6(a.c_str()).to_string() == a);
    ASIO_CHECK(network_v6(make_address_v6("2001:370::10:7344"), 27).to_string() == std::string("2001:370::10:7344/27"));
  
    // return host part
    ASIO_CHECK(make_network_v6("2001:370::10:7344/64").address() == make_address_v6("2001:370::10:7344"));
    ASIO_CHECK(make_network_v6("2001:370::10:7344/27").address().to_string() == "2001:370::10:7344");
  
    // return network in CIDR notation
    ASIO_CHECK(make_network_v6("2001:370::10:7344/27").canonical().to_string() == "2001:360::/27");
  
    // is host
    ASIO_CHECK(make_network_v6("2001:370::10:7344/128").is_host());
    ASIO_CHECK(!make_network_v6("2001:370::10:7344/127").is_host());
  
    // is real subnet of
    ASIO_CHECK(make_network_v6("2001:370::10:3744/64").is_subnet_of(make_network_v6("2001:370::/16")));
    ASIO_CHECK(make_network_v6("2001:370::/64").is_subnet_of(make_network_v6("2001:370::/16")));
    ASIO_CHECK(make_network_v6("2001:0db8:85a3::/64").is_subnet_of(make_network_v6("2001:0d00::/24")));
  
    ASIO_CHECK(!make_network_v6("2001:370::10:3744/128").is_subnet_of(make_network_v6("2001:370::10:3744/128")));
    ASIO_CHECK(make_network_v6("2001:0db8:85a3::/64").is_subnet_of(make_network_v6("2001:0dc0::/24")));
  
    network_v6 r(make_network_v6("2001:370::/64"));
    ASIO_CHECK(!r.is_subnet_of(r));
  
    network_v6 net12(make_network_v6("2001:370::10:7344/64"));
    network_v6 net13(make_network_v6("2001:0db8::/127"));
    network_v6 net14(make_network_v6("2001:0db8::/125"));
    network_v6 net15(make_network_v6("2001:0db8::/119"));
  
    // network
    ASIO_CHECK(net12.network() == make_address_v6("2001:370::"));
    ASIO_CHECK(net13.network() == make_address_v6("2001:0db8::"));
    ASIO_CHECK(net14.network() == make_address_v6("2001:0db8::"));
    ASIO_CHECK(net15.network() == make_address_v6("2001:0db8::"));
  
    // iterator
    //ASIO_CHECK(std::distance(net12.hosts().begin(),net12.hosts().end()) == 18446744073709552000);
    ASIO_CHECK(std::distance(net13.hosts().begin(),net13.hosts().end()) == 2);
    ASIO_CHECK(std::distance(net14.hosts().begin(),net14.hosts().end()) == 8);
    ASIO_CHECK(std::distance(net15.hosts().begin(),net15.hosts().end()) == 512);
    ASIO_CHECK(*net12.hosts().begin() == make_address_v6("2001:0370::"));
    ASIO_CHECK(net12.hosts().end() != net12.hosts().find(make_address_v6("2001:0370::ffff:ffff:ffff:ffff")));
    ASIO_CHECK(*net13.hosts().begin() == make_address_v6("2001:0db8::"));
    ASIO_CHECK(net13.hosts().end() != net13.hosts().find(make_address_v6("2001:0db8::1")));
    ASIO_CHECK(net13.hosts().end() == net13.hosts().find(make_address_v6("2001:0db8::2")));
    ASIO_CHECK(*net14.hosts().begin() == make_address_v6("2001:0db8::"));
    ASIO_CHECK(net14.hosts().end() != net14.hosts().find(make_address_v6("2001:0db8::7")));
    ASIO_CHECK(net14.hosts().end() == net14.hosts().find(make_address_v6("2001:0db8::8")));
    ASIO_CHECK(*net15.hosts().begin() == make_address_v6("2001:0db8::"));
    ASIO_CHECK(net15.hosts().end() != net15.hosts().find(make_address_v6("2001:0db8::01ff")));
    ASIO_CHECK(net15.hosts().end() == net15.hosts().find(make_address_v6("2001:0db8::0200")));
  }
  
  } // namespace ip_network_v6_runtime
  
  //------------------------------------------------------------------------------
  
  ASIO_TEST_SUITE
  (
    "ip/network_v6",
    ASIO_TEST_CASE(ip_network_v6_compile::test)
    ASIO_TEST_CASE(ip_network_v6_runtime::test)
  )
  