text: //
  // tcp.hpp
  // ~~~~~~~
  //
  // Copyright (c) 2003-2008 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 ASIO_IP_TCP_HPP
  #define ASIO_IP_TCP_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include "asio/detail/push_options.hpp"
  
  #include "asio/basic_socket_acceptor.hpp"
  #include "asio/basic_socket_iostream.hpp"
  #include "asio/basic_stream_socket.hpp"
  #include "asio/ip/basic_endpoint.hpp"
  #include "asio/ip/basic_resolver.hpp"
  #include "asio/ip/basic_resolver_iterator.hpp"
  #include "asio/ip/basic_resolver_query.hpp"
  #include "asio/detail/socket_option.hpp"
  #include "asio/detail/socket_types.hpp"
  
  namespace asio {
  namespace ip {
  
  /// Encapsulates the flags needed for TCP.
  /**
   * The asio::ip::tcp class contains flags necessary for TCP sockets.
   *
   * @par Thread Safety
   * @e Distinct @e objects: Safe.@n
   * @e Shared @e objects: Safe.
   *
   * @par Concepts:
   * Protocol, InternetProtocol.
   */
  class tcp
  {
  public:
    /// The type of a TCP endpoint.
    typedef basic_endpoint<tcp> endpoint;
  
    /// The type of a resolver query.
    typedef basic_resolver_query<tcp> resolver_query;
  
    /// The type of a resolver iterator.
    typedef basic_resolver_iterator<tcp> resolver_iterator;
  
    /// Construct to represent the IPv4 TCP protocol.
    static tcp v4()
    {
      return tcp(PF_INET);
    }
  
    /// Construct to represent the IPv6 TCP protocol.
    static tcp v6()
    {
      return tcp(PF_INET6);
    }
  
    /// Obtain an identifier for the type of the protocol.
    int type() const
    {
      return SOCK_STREAM;
    }
  
    /// Obtain an identifier for the protocol.
    int protocol() const
    {
      return IPPROTO_TCP;
    }
  
    /// Obtain an identifier for the protocol family.
    int family() const
    {
      return family_;
    }
  
    /// The TCP socket type.
    typedef basic_stream_socket<tcp> socket;
  
    /// The TCP acceptor type.
    typedef basic_socket_acceptor<tcp> acceptor;
  
    /// The TCP resolver type.
    typedef basic_resolver<tcp> resolver;
  
    /// The TCP iostream type.
    typedef basic_socket_iostream<tcp> iostream;
  
    /// Socket option for disabling the Nagle algorithm.
    /**
     * Implements the IPPROTO_TCP/TCP_NODELAY socket option.
     *
     * @par Examples
     * Setting the option:
     * @code
     * asio::ip::tcp::socket socket(io_service); 
     * ...
     * asio::ip::tcp::no_delay option(true);
     * socket.set_option(option);
     * @endcode
     *
     * @par
     * Getting the current option value:
     * @code
     * asio::ip::tcp::socket socket(io_service); 
     * ...
     * asio::ip::tcp::no_delay option;
     * socket.get_option(option);
     * bool is_set = option.value();
     * @endcode
     *
     * @par Concepts:
     * Socket_Option, Boolean_Socket_Option.
     */
  #if defined(GENERATING_DOCUMENTATION)
    typedef implementation_defined no_delay;
  #else
    typedef asio::detail::socket_option::boolean<
      IPPROTO_TCP, TCP_NODELAY> no_delay;
  #endif
  
    /// Compare two protocols for equality.
    friend bool operator==(const tcp& p1, const tcp& p2)
    {
      return p1.family_ == p2.family_;
    }
  
    /// Compare two protocols for inequality.
    friend bool operator!=(const tcp& p1, const tcp& p2)
    {
      return p1.family_ != p2.family_;
    }
  
  private:
    // Construct with a specific family.
    explicit tcp(int family)
      : family_(family)
    {
    }
  
    int family_;
  };
  
  } // namespace ip
  } // namespace asio
  
  #include "asio/detail/pop_options.hpp"
  
  #endif // ASIO_IP_TCP_HPP
  