text: //
  // socket_base.cpp
  // ~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2018 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)
  //
  
  // 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/socket_base.hpp"
  
  #include "asio/io_context.hpp"
  #include "asio/ip/tcp.hpp"
  #include "asio/ip/udp.hpp"
  #include "unit_test.hpp"
  
  //------------------------------------------------------------------------------
  
  // socket_base_compile test
  // ~~~~~~~~~~~~~~~~~~~~~~~~
  // The following test checks that all nested classes, enums and constants in
  // socket_base compile and link correctly. Runtime failures are ignored.
  
  namespace socket_base_compile {
  
  void test()
  {
    using namespace asio;
    namespace ip = asio::ip;
  
    try
    {
      io_context ioc;
      ip::tcp::socket sock(ioc);
      char buf[1024];
  
      // shutdown_type enumeration.
  
      sock.shutdown(socket_base::shutdown_receive);
      sock.shutdown(socket_base::shutdown_send);
      sock.shutdown(socket_base::shutdown_both);
  
      // message_flags constants.
  
      sock.receive(buffer(buf), socket_base::message_peek);
      sock.receive(buffer(buf), socket_base::message_out_of_band);
      sock.send(buffer(buf), socket_base::message_do_not_route);
  
      // broadcast class.
  
      socket_base::broadcast broadcast1(true);
      sock.set_option(broadcast1);
      socket_base::broadcast broadcast2;
      sock.get_option(broadcast2);
      broadcast1 = true;
      (void)static_cast<bool>(broadcast1);
      (void)static_cast<bool>(!broadcast1);
      (void)static_cast<bool>(broadcast1.value());
  
      // debug class.
  
      socket_base::debug debug1(true);
      sock.set_option(debug1);
      socket_base::debug debug2;
      sock.get_option(debug2);
      debug1 = true;
      (void)static_cast<bool>(debug1);
      (void)static_cast<bool>(!debug1);
      (void)static_cast<bool>(debug1.value());
  
      // do_not_route class.
  
      socket_base::do_not_route do_not_route1(true);
      sock.set_option(do_not_route1);
      socket_base::do_not_route do_not_route2;
      sock.get_option(do_not_route2);
      do_not_route1 = true;
      (void)static_cast<bool>(do_not_route1);
      (void)static_cast<bool>(!do_not_route1);
      (void)static_cast<bool>(do_not_route1.value());
  
      // keep_alive class.
  
      socket_base::keep_alive keep_alive1(true);
      sock.set_option(keep_alive1);
      socket_base::keep_alive keep_alive2;
      sock.get_option(keep_alive2);
      keep_alive1 = true;
      (void)static_cast<bool>(keep_alive1);
      (void)static_cast<bool>(!keep_alive1);
      (void)static_cast<bool>(keep_alive1.value());
  
      // send_buffer_size class.
  
      socket_base::send_buffer_size send_buffer_size1(1024);
      sock.set_option(send_buffer_size1);
      socket_base::send_buffer_size send_buffer_size2;
      sock.get_option(send_buffer_size2);
      send_buffer_size1 = 1;
      (void)static_cast<int>(send_buffer_size1.value());
  
      // send_low_watermark class.
  
      socket_base::send_low_watermark send_low_watermark1(128);
      sock.set_option(send_low_watermark1);
      socket_base::send_low_watermark send_low_watermark2;
      sock.get_option(send_low_watermark2);
      send_low_watermark1 = 1;
      (void)static_cast<int>(send_low_watermark1.value());
  
      // receive_buffer_size class.
  
      socket_base::receive_buffer_size receive_buffer_size1(1024);
      sock.set_option(receive_buffer_size1);
      socket_base::receive_buffer_size receive_buffer_size2;
      sock.get_option(receive_buffer_size2);
      receive_buffer_size1 = 1;
      (void)static_cast<int>(receive_buffer_size1.value());
  
      // receive_low_watermark class.
  
      socket_base::receive_low_watermark receive_low_watermark1(128);
      sock.set_option(receive_low_watermark1);
      socket_base::receive_low_watermark receive_low_watermark2;
      sock.get_option(receive_low_watermark2);
      receive_low_watermark1 = 1;
      (void)static_cast<int>(receive_low_watermark1.value());
  
      // reuse_address class.
  
      socket_base::reuse_address reuse_address1(true);
      sock.set_option(reuse_address1);
      socket_base::reuse_address reuse_address2;
      sock.get_option(reuse_address2);
      reuse_address1 = true;
      (void)static_cast<bool>(reuse_address1);
      (void)static_cast<bool>(!reuse_address1);
      (void)static_cast<bool>(reuse_address1.value());
  
      // linger class.
  
      socket_base::linger linger1(true, 30);
      sock.set_option(linger1);
      socket_base::linger linger2;
      sock.get_option(linger2);
      linger1.enabled(true);
      (void)static_cast<bool>(linger1.enabled());
      linger1.timeout(1);
      (void)static_cast<int>(linger1.timeout());
  
      // out_of_band_inline class.
  
      socket_base::out_of_band_inline out_of_band_inline1(true);
      sock.set_option(out_of_band_inline1);
      socket_base::out_of_band_inline out_of_band_inline2;
      sock.get_option(out_of_band_inline2);
      out_of_band_inline1 = true;
      (void)static_cast<bool>(out_of_band_inline1);
      (void)static_cast<bool>(!out_of_band_inline1);
      (void)static_cast<bool>(out_of_band_inline1.value());
  
      // enable_connection_aborted class.
  
      socket_base::enable_connection_aborted enable_connection_aborted1(true);
      sock.set_option(enable_connection_aborted1);
      socket_base::enable_connection_aborted enable_connection_aborted2;
      sock.get_option(enable_connection_aborted2);
      enable_connection_aborted1 = true;
      (void)static_cast<bool>(enable_connection_aborted1);
      (void)static_cast<bool>(!enable_connection_aborted1);
      (void)static_cast<bool>(enable_connection_aborted1.value());
  
      // bytes_readable class.
  
      socket_base::bytes_readable bytes_readable;
      sock.io_control(bytes_readable);
      std::size_t bytes = bytes_readable.get();
      (void)bytes;
    }
    catch (std::exception&)
    {
    }
  }
  
  } // namespace socket_base_compile
  
  //------------------------------------------------------------------------------
  
  // socket_base_runtime test
  // ~~~~~~~~~~~~~~~~~~~~~~~~
  // The following test checks the runtime operation of the socket options and I/O
  // control commands defined in socket_base.
  
  namespace socket_base_runtime {
  
  void test()
  {
    using namespace asio;
    namespace ip = asio::ip;
  
    io_context ioc;
    ip::udp::socket udp_sock(ioc, ip::udp::v4());
    ip::tcp::socket tcp_sock(ioc, ip::tcp::v4());
    ip::tcp::acceptor tcp_acceptor(ioc, ip::tcp::v4());
    asio::error_code ec;
  
    // broadcast class.
  
    socket_base::broadcast broadcast1(true);
    ASIO_CHECK(broadcast1.value());
    ASIO_CHECK(static_cast<bool>(broadcast1));
    ASIO_CHECK(!!broadcast1);
    udp_sock.set_option(broadcast1, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::broadcast broadcast2;
    udp_sock.get_option(broadcast2, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(broadcast2.value());
    ASIO_CHECK(static_cast<bool>(broadcast2));
    ASIO_CHECK(!!broadcast2);
  
    socket_base::broadcast broadcast3(false);
    ASIO_CHECK(!broadcast3.value());
    ASIO_CHECK(!static_cast<bool>(broadcast3));
    ASIO_CHECK(!broadcast3);
    udp_sock.set_option(broadcast3, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::broadcast broadcast4;
    udp_sock.get_option(broadcast4, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(!broadcast4.value());
    ASIO_CHECK(!static_cast<bool>(broadcast4));
    ASIO_CHECK(!broadcast4);
  
    // debug class.
  
    socket_base::debug debug1(true);
    ASIO_CHECK(debug1.value());
    ASIO_CHECK(static_cast<bool>(debug1));
    ASIO_CHECK(!!debug1);
    udp_sock.set_option(debug1, ec);
  #if defined(__linux__)
    // On Linux, only root can set SO_DEBUG.
    bool not_root = (ec == asio::error::access_denied);
    ASIO_CHECK(!ec || not_root);
    ASIO_WARN_MESSAGE(!ec, "Must be root to set debug socket option");
  #else // defined(__linux__)
  # if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    // Option is not supported under Windows CE.
    ASIO_CHECK_MESSAGE(ec == asio::error::no_protocol_option,
        ec.value() << ", " << ec.message());
  # else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  # endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  #endif // defined(__linux__)
  
    socket_base::debug debug2;
    udp_sock.get_option(debug2, ec);
  #if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    // Option is not supported under Windows CE.
    ASIO_CHECK_MESSAGE(ec == asio::error::no_protocol_option,
        ec.value() << ", " << ec.message());
  #else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  # if defined(__linux__)
    ASIO_CHECK(debug2.value() || not_root);
    ASIO_CHECK(static_cast<bool>(debug2) || not_root);
    ASIO_CHECK(!!debug2 || not_root);
  # else // defined(__linux__)
    ASIO_CHECK(debug2.value());
    ASIO_CHECK(static_cast<bool>(debug2));
    ASIO_CHECK(!!debug2);
  # endif // defined(__linux__)
  #endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  
    socket_base::debug debug3(false);
    ASIO_CHECK(!debug3.value());
    ASIO_CHECK(!static_cast<bool>(debug3));
    ASIO_CHECK(!debug3);
    udp_sock.set_option(debug3, ec);
  #if defined(__linux__)
    ASIO_CHECK(!ec || not_root);
  #else // defined(__linux__)
  # if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    // Option is not supported under Windows CE.
    ASIO_CHECK_MESSAGE(ec == asio::error::no_protocol_option,
        ec.value() << ", " << ec.message());
  # else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  # endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  #endif // defined(__linux__)
  
    socket_base::debug debug4;
    udp_sock.get_option(debug4, ec);
  #if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    // Option is not supported under Windows CE.
    ASIO_CHECK_MESSAGE(ec == asio::error::no_protocol_option,
        ec.value() << ", " << ec.message());
  #else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  # if defined(__linux__)
    ASIO_CHECK(!debug4.value() || not_root);
    ASIO_CHECK(!static_cast<bool>(debug4) || not_root);
    ASIO_CHECK(!debug4 || not_root);
  # else // defined(__linux__)
    ASIO_CHECK(!debug4.value());
    ASIO_CHECK(!static_cast<bool>(debug4));
    ASIO_CHECK(!debug4);
  # endif // defined(__linux__)
  #endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  
    // do_not_route class.
  
    socket_base::do_not_route do_not_route1(true);
    ASIO_CHECK(do_not_route1.value());
    ASIO_CHECK(static_cast<bool>(do_not_route1));
    ASIO_CHECK(!!do_not_route1);
    udp_sock.set_option(do_not_route1, ec);
  #if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    // Option is not supported under Windows CE.
    ASIO_CHECK_MESSAGE(ec == asio::error::no_protocol_option,
        ec.value() << ", " << ec.message());
  #else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  #endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  
    socket_base::do_not_route do_not_route2;
    udp_sock.get_option(do_not_route2, ec);
  #if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    // Option is not supported under Windows CE.
    ASIO_CHECK_MESSAGE(ec == asio::error::no_protocol_option,
        ec.value() << ", " << ec.message());
  #else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(do_not_route2.value());
    ASIO_CHECK(static_cast<bool>(do_not_route2));
    ASIO_CHECK(!!do_not_route2);
  #endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  
    socket_base::do_not_route do_not_route3(false);
    ASIO_CHECK(!do_not_route3.value());
    ASIO_CHECK(!static_cast<bool>(do_not_route3));
    ASIO_CHECK(!do_not_route3);
    udp_sock.set_option(do_not_route3, ec);
  #if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    // Option is not supported under Windows CE.
    ASIO_CHECK_MESSAGE(ec == asio::error::no_protocol_option,
        ec.value() << ", " << ec.message());
  #else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  #endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  
    socket_base::do_not_route do_not_route4;
    udp_sock.get_option(do_not_route4, ec);
  #if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    // Option is not supported under Windows CE.
    ASIO_CHECK_MESSAGE(ec == asio::error::no_protocol_option,
        ec.value() << ", " << ec.message());
  #else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(!do_not_route4.value());
    ASIO_CHECK(!static_cast<bool>(do_not_route4));
    ASIO_CHECK(!do_not_route4);
  #endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  
    // keep_alive class.
  
    socket_base::keep_alive keep_alive1(true);
    ASIO_CHECK(keep_alive1.value());
    ASIO_CHECK(static_cast<bool>(keep_alive1));
    ASIO_CHECK(!!keep_alive1);
    tcp_sock.set_option(keep_alive1, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::keep_alive keep_alive2;
    tcp_sock.get_option(keep_alive2, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(keep_alive2.value());
    ASIO_CHECK(static_cast<bool>(keep_alive2));
    ASIO_CHECK(!!keep_alive2);
  
    socket_base::keep_alive keep_alive3(false);
    ASIO_CHECK(!keep_alive3.value());
    ASIO_CHECK(!static_cast<bool>(keep_alive3));
    ASIO_CHECK(!keep_alive3);
    tcp_sock.set_option(keep_alive3, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::keep_alive keep_alive4;
    tcp_sock.get_option(keep_alive4, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(!keep_alive4.value());
    ASIO_CHECK(!static_cast<bool>(keep_alive4));
    ASIO_CHECK(!keep_alive4);
  
    // send_buffer_size class.
  
    socket_base::send_buffer_size send_buffer_size1(4096);
    ASIO_CHECK(send_buffer_size1.value() == 4096);
    tcp_sock.set_option(send_buffer_size1, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::send_buffer_size send_buffer_size2;
    tcp_sock.get_option(send_buffer_size2, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(send_buffer_size2.value() == 4096);
  
    socket_base::send_buffer_size send_buffer_size3(16384);
    ASIO_CHECK(send_buffer_size3.value() == 16384);
    tcp_sock.set_option(send_buffer_size3, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::send_buffer_size send_buffer_size4;
    tcp_sock.get_option(send_buffer_size4, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(send_buffer_size4.value() == 16384);
  
    // send_low_watermark class.
  
    socket_base::send_low_watermark send_low_watermark1(4096);
    ASIO_CHECK(send_low_watermark1.value() == 4096);
    tcp_sock.set_option(send_low_watermark1, ec);
  #if defined(WIN32) || defined(__linux__) || defined(__sun)
    ASIO_CHECK(!!ec); // Not supported on Windows, Linux or Solaris.
  #else
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  #endif
  
    socket_base::send_low_watermark send_low_watermark2;
    tcp_sock.get_option(send_low_watermark2, ec);
  #if defined(WIN32) || defined(__sun)
    ASIO_CHECK(!!ec); // Not supported on Windows or Solaris.
  #elif defined(__linux__)
    ASIO_CHECK(!ec); // Not supported on Linux but can get value.
  #else
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(send_low_watermark2.value() == 4096);
  #endif
  
    socket_base::send_low_watermark send_low_watermark3(8192);
    ASIO_CHECK(send_low_watermark3.value() == 8192);
    tcp_sock.set_option(send_low_watermark3, ec);
  #if defined(WIN32) || defined(__linux__) || defined(__sun)
    ASIO_CHECK(!!ec); // Not supported on Windows, Linux or Solaris.
  #else
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  #endif
  
    socket_base::send_low_watermark send_low_watermark4;
    tcp_sock.get_option(send_low_watermark4, ec);
  #if defined(WIN32) || defined(__sun)
    ASIO_CHECK(!!ec); // Not supported on Windows or Solaris.
  #elif defined(__linux__)
    ASIO_CHECK(!ec); // Not supported on Linux but can get value.
  #else
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(send_low_watermark4.value() == 8192);
  #endif
  
    // receive_buffer_size class.
  
    socket_base::receive_buffer_size receive_buffer_size1(4096);
    ASIO_CHECK(receive_buffer_size1.value() == 4096);
    tcp_sock.set_option(receive_buffer_size1, ec);
  #if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    // Option is not supported under Windows CE.
    ASIO_CHECK_MESSAGE(ec == asio::error::no_protocol_option,
        ec.value() << ", " << ec.message());
  #else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  #endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  
    socket_base::receive_buffer_size receive_buffer_size2;
    tcp_sock.get_option(receive_buffer_size2, ec);
  #if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK(!ec); // Not supported under Windows CE but can get value.
  #else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(receive_buffer_size2.value() == 4096);
  #endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  
    socket_base::receive_buffer_size receive_buffer_size3(16384);
    ASIO_CHECK(receive_buffer_size3.value() == 16384);
    tcp_sock.set_option(receive_buffer_size3, ec);
  #if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    // Option is not supported under Windows CE.
    ASIO_CHECK_MESSAGE(ec == asio::error::no_protocol_option,
        ec.value() << ", " << ec.message());
  #else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  #endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  
    socket_base::receive_buffer_size receive_buffer_size4;
    tcp_sock.get_option(receive_buffer_size4, ec);
  #if defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK(!ec); // Not supported under Windows CE but can get value.
  #else // defined(ASIO_WINDOWS) && defined(UNDER_CE)
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(receive_buffer_size4.value() == 16384);
  #endif // defined(ASIO_WINDOWS) && defined(UNDER_CE)
  
    // receive_low_watermark class.
  
    socket_base::receive_low_watermark receive_low_watermark1(4096);
    ASIO_CHECK(receive_low_watermark1.value() == 4096);
    tcp_sock.set_option(receive_low_watermark1, ec);
  #if defined(WIN32) || defined(__sun)
    ASIO_CHECK(!!ec); // Not supported on Windows or Solaris.
  #else
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  #endif
  
    socket_base::receive_low_watermark receive_low_watermark2;
    tcp_sock.get_option(receive_low_watermark2, ec);
  #if defined(WIN32) || defined(__sun)
    ASIO_CHECK(!!ec); // Not supported on Windows or Solaris.
  #else
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(receive_low_watermark2.value() == 4096);
  #endif
  
    socket_base::receive_low_watermark receive_low_watermark3(8192);
    ASIO_CHECK(receive_low_watermark3.value() == 8192);
    tcp_sock.set_option(receive_low_watermark3, ec);
  #if defined(WIN32) || defined(__sun)
    ASIO_CHECK(!!ec); // Not supported on Windows or Solaris.
  #else
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  #endif
  
    socket_base::receive_low_watermark receive_low_watermark4;
    tcp_sock.get_option(receive_low_watermark4, ec);
  #if defined(WIN32) || defined(__sun)
    ASIO_CHECK(!!ec); // Not supported on Windows or Solaris.
  #else
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(receive_low_watermark4.value() == 8192);
  #endif
  
    // reuse_address class.
  
    socket_base::reuse_address reuse_address1(true);
    ASIO_CHECK(reuse_address1.value());
    ASIO_CHECK(static_cast<bool>(reuse_address1));
    ASIO_CHECK(!!reuse_address1);
    udp_sock.set_option(reuse_address1, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::reuse_address reuse_address2;
    udp_sock.get_option(reuse_address2, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(reuse_address2.value());
    ASIO_CHECK(static_cast<bool>(reuse_address2));
    ASIO_CHECK(!!reuse_address2);
  
    socket_base::reuse_address reuse_address3(false);
    ASIO_CHECK(!reuse_address3.value());
    ASIO_CHECK(!static_cast<bool>(reuse_address3));
    ASIO_CHECK(!reuse_address3);
    udp_sock.set_option(reuse_address3, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::reuse_address reuse_address4;
    udp_sock.get_option(reuse_address4, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(!reuse_address4.value());
    ASIO_CHECK(!static_cast<bool>(reuse_address4));
    ASIO_CHECK(!reuse_address4);
  
    // linger class.
  
    socket_base::linger linger1(true, 60);
    ASIO_CHECK(linger1.enabled());
    ASIO_CHECK(linger1.timeout() == 60);
    tcp_sock.set_option(linger1, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::linger linger2;
    tcp_sock.get_option(linger2, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(linger2.enabled());
    ASIO_CHECK(linger2.timeout() == 60);
  
    socket_base::linger linger3(false, 0);
    ASIO_CHECK(!linger3.enabled());
    ASIO_CHECK(linger3.timeout() == 0);
    tcp_sock.set_option(linger3, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::linger linger4;
    tcp_sock.get_option(linger4, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(!linger4.enabled());
  
    // enable_connection_aborted class.
  
    socket_base::enable_connection_aborted enable_connection_aborted1(true);
    ASIO_CHECK(enable_connection_aborted1.value());
    ASIO_CHECK(static_cast<bool>(enable_connection_aborted1));
    ASIO_CHECK(!!enable_connection_aborted1);
    tcp_acceptor.set_option(enable_connection_aborted1, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::enable_connection_aborted enable_connection_aborted2;
    tcp_acceptor.get_option(enable_connection_aborted2, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(enable_connection_aborted2.value());
    ASIO_CHECK(static_cast<bool>(enable_connection_aborted2));
    ASIO_CHECK(!!enable_connection_aborted2);
  
    socket_base::enable_connection_aborted enable_connection_aborted3(false);
    ASIO_CHECK(!enable_connection_aborted3.value());
    ASIO_CHECK(!static_cast<bool>(enable_connection_aborted3));
    ASIO_CHECK(!enable_connection_aborted3);
    tcp_acceptor.set_option(enable_connection_aborted3, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  
    socket_base::enable_connection_aborted enable_connection_aborted4;
    tcp_acceptor.get_option(enable_connection_aborted4, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
    ASIO_CHECK(!enable_connection_aborted4.value());
    ASIO_CHECK(!static_cast<bool>(enable_connection_aborted4));
    ASIO_CHECK(!enable_connection_aborted4);
  
    // bytes_readable class.
  
    socket_base::bytes_readable bytes_readable;
    udp_sock.io_control(bytes_readable, ec);
    ASIO_CHECK_MESSAGE(!ec, ec.value() << ", " << ec.message());
  }
  
  } // namespace socket_base_runtime
  
  //------------------------------------------------------------------------------
  
  ASIO_TEST_SUITE
  (
    "socket_base",
    ASIO_TEST_CASE(socket_base_compile::test)
    ASIO_TEST_CASE(socket_base_runtime::test)
  )
  