text: //
  // ip/impl/address_v4.hpp
  // ~~~~~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2011 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 BOOST_ASIO_IP_IMPL_ADDRESS_V4_HPP
  #define BOOST_ASIO_IP_IMPL_ADDRESS_V4_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #if !defined(BOOST_NO_IOSTREAM)
  
  #include <boost/asio/detail/throw_error.hpp>
  
  #include <boost/asio/detail/push_options.hpp>
  
  namespace boost {
  namespace asio {
  namespace ip {
  
  template <typename Elem, typename Traits>
  std::basic_ostream<Elem, Traits>& operator<<(
      std::basic_ostream<Elem, Traits>& os, const address_v4& addr)
  {
    boost::system::error_code ec;
    std::string s = addr.to_string(ec);
    if (ec)
    {
      if (os.exceptions() & std::basic_ostream<Elem, Traits>::failbit)
        boost::asio::detail::throw_error(ec);
      else
        os.setstate(std::basic_ostream<Elem, Traits>::failbit);
    }
    else
      for (std::string::iterator i = s.begin(); i != s.end(); ++i)
        os << os.widen(*i);
    return os;
  }
  
  } // namespace ip
  } // namespace asio
  } // namespace boost
  
  #include <boost/asio/detail/pop_options.hpp>
  
  #endif // !defined(BOOST_NO_IOSTREAM)
  
  #endif // BOOST_ASIO_IP_IMPL_ADDRESS_V4_HPP
  