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//
// generic/seq_packet_protocol.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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_GENERIC_SEQ_PACKET_PROTOCOL_HPP
#define BOOST_ASIO_GENERIC_SEQ_PACKET_PROTOCOL_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

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

#include <typeinfo>
#include <boost/asio/basic_seq_packet_socket.hpp>
#include <boost/asio/detail/socket_types.hpp>
#include <boost/asio/detail/throw_exception.hpp>
#include <boost/asio/generic/basic_endpoint.hpp>

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

namespace boost {
namespace asio {
namespace generic {

/// Encapsulates the flags needed for a generic sequenced packet socket.
/**
 * The boost::asio::generic::seq_packet_protocol class contains flags necessary
 * for seq_packet-oriented sockets of any address family and protocol.
 *
 * @par Examples
 * Constructing using a native address family and socket protocol:
 * @code seq_packet_protocol p(AF_INET, IPPROTO_SCTP); @endcode
 *
 * @par Thread Safety
 * @e Distinct @e objects: Safe.@n
 * @e Shared @e objects: Safe.
 *
 * @par Concepts:
 * Protocol.
 */
class seq_packet_protocol
{
public:
  /// Construct a protocol object for a specific address family and protocol.
  seq_packet_protocol(int address_family, int socket_protocol)
    : family_(address_family),
      protocol_(socket_protocol)
  {
  }

  /// Construct a generic protocol object from a specific protocol.
  /**
   * @throws @c bad_cast Thrown if the source protocol is not based around
   * sequenced packets.
   */
  template <typename Protocol>
  seq_packet_protocol(const Protocol& source_protocol)
    : family_(source_protocol.family()),
      protocol_(source_protocol.protocol())
  {
    if (source_protocol.type() != type())
    {
      std::bad_cast ex;
      boost::asio::detail::throw_exception(ex);
    }
  }

  /// Obtain an identifier for the type of the protocol.
  int type() const BOOST_ASIO_NOEXCEPT
  {
    return BOOST_ASIO_OS_DEF(SOCK_SEQPACKET);
  }

  /// Obtain an identifier for the protocol.
  int protocol() const BOOST_ASIO_NOEXCEPT
  {
    return protocol_;
  }

  /// Obtain an identifier for the protocol family.
  int family() const BOOST_ASIO_NOEXCEPT
  {
    return family_;
  }

  /// Compare two protocols for equality.
  friend bool operator==(const seq_packet_protocol& p1,
      const seq_packet_protocol& p2)
  {
    return p1.family_ == p2.family_ && p1.protocol_ == p2.protocol_;
  }

  /// Compare two protocols for inequality.
  friend bool operator!=(const seq_packet_protocol& p1,
      const seq_packet_protocol& p2)
  {
    return !(p1 == p2);
  }

  /// The type of an endpoint.
  typedef basic_endpoint<seq_packet_protocol> endpoint;

  /// The generic socket type.
  typedef basic_seq_packet_socket<seq_packet_protocol> socket;

private:
  int family_;
  int protocol_;
};

} // namespace generic
} // namespace asio
} // namespace boost

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

#endif // BOOST_ASIO_GENERIC_SEQ_PACKET_PROTOCOL_HPP

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