/Dependencies/include/Boost/boost/asio/ip/resolver_query_base.hpp

//

// ip/resolver_query_base.hpp

// ~~~~~~~~~~~~~~~~~~~~~~~~~~

//

// Copyright (c) 2003-2012 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_RESOLVER_QUERY_BASE_HPP

#define BOOST_ASIO_IP_RESOLVER_QUERY_BASE_HPP



#if defined(_MSC_VER) && (_MSC_VER >= 1200)

# pragma once

#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)



#include <boost/asio/detail/config.hpp>

#include <boost/detail/workaround.hpp>

#include <boost/asio/detail/socket_types.hpp>



#include <boost/asio/detail/push_options.hpp>



namespace boost {

namespace asio {

namespace ip {



/// The resolver_query_base class is used as a base for the

/// basic_resolver_query class templates to provide a common place to define

/// the flag constants.

class resolver_query_base

{

public:

#if defined(GENERATING_DOCUMENTATION)

  /// A bitmask type (C++ Std [lib.bitmask.types]).

  typedef unspecified flags;



  /// Determine the canonical name of the host specified in the query.

  static const flags canonical_name = implementation_defined;



  /// Indicate that returned endpoint is intended for use as a locally bound

  /// socket endpoint.

  static const flags passive = implementation_defined;



  /// Host name should be treated as a numeric string defining an IPv4 or IPv6

  /// address and no name resolution should be attempted.

  static const flags numeric_host = implementation_defined;



  /// Service name should be treated as a numeric string defining a port number

  /// and no name resolution should be attempted.

  static const flags numeric_service = implementation_defined;



  /// If the query protocol family is specified as IPv6, return IPv4-mapped

  /// IPv6 addresses on finding no IPv6 addresses.

  static const flags v4_mapped = implementation_defined;



  /// If used with v4_mapped, return all matching IPv6 and IPv4 addresses.

  static const flags all_matching = implementation_defined;



  /// Only return IPv4 addresses if a non-loopback IPv4 address is configured

  /// for the system. Only return IPv6 addresses if a non-loopback IPv6 address

  /// is configured for the system.

  static const flags address_configured = implementation_defined;

#else

  enum flags

  {

    canonical_name = AI_CANONNAME,

    passive = AI_PASSIVE,

    numeric_host = AI_NUMERICHOST,

# if defined(AI_NUMERICSERV)

    numeric_service = AI_NUMERICSERV,

# else

    numeric_service = 0,

# endif

    // Note: QNX Neutrino 6.3 defines AI_V4MAPPED, AI_ALL and AI_ADDRCONFIG but

    // does not implement them. Therefore they are specifically excluded here.

# if defined(AI_V4MAPPED) && !defined(__QNXNTO__)

    v4_mapped = AI_V4MAPPED,

# else

    v4_mapped = 0,

# endif

# if defined(AI_ALL) && !defined(__QNXNTO__)

    all_matching = AI_ALL,

# else

    all_matching = 0,

# endif

# if defined(AI_ADDRCONFIG) && !defined(__QNXNTO__)

    address_configured = AI_ADDRCONFIG

# else

    address_configured = 0

# endif

  };



  // Implement bitmask operations as shown in C++ Std [lib.bitmask.types].



  friend flags operator&(flags x, flags y)

  {

    return static_cast<flags>(

        static_cast<unsigned int>(x) & static_cast<unsigned int>(y));

  }



  friend flags operator|(flags x, flags y)

  {

    return static_cast<flags>(

        static_cast<unsigned int>(x) | static_cast<unsigned int>(y));

  }



  friend flags operator^(flags x, flags y)

  {

    return static_cast<flags>(

        static_cast<unsigned int>(x) ^ static_cast<unsigned int>(y));

  }



  friend flags operator~(flags x)

  {

    return static_cast<flags>(static_cast<unsigned int>(~x));

  }



  friend flags& operator&=(flags& x, flags y)

  {

    x = x & y;

    return x;

  }



  friend flags& operator|=(flags& x, flags y)

  {

    x = x | y;

    return x;

  }



  friend flags& operator^=(flags& x, flags y)

  {

    x = x ^ y;

    return x;

  }

#endif



protected:

  /// Protected destructor to prevent deletion through this type.

  ~resolver_query_base()

  {

  }



#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))

private:

  // Workaround to enable the empty base optimisation with Borland C++.

  char dummy_;

#endif

};



} // namespace ip

} // namespace asio

} // namespace boost



#include <boost/asio/detail/pop_options.hpp>



#endif // BOOST_ASIO_IP_RESOLVER_QUERY_BASE_HPP