basic_datagram_socket.hpp

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//
// basic_datagram_socket.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2007 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_BASIC_DATAGRAM_SOCKET_HPP
#define ASIO_BASIC_DATAGRAM_SOCKET_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/detail/push_options.hpp"
#include <cstddef>
#include <boost/config.hpp>
#include "asio/detail/pop_options.hpp"

#include "asio/basic_socket.hpp"
#include "asio/datagram_socket_service.hpp"
#include "asio/error.hpp"
#include "asio/detail/throw_error.hpp"

namespace asio {

/// Provides datagram-oriented socket functionality.
/**
 * The basic_datagram_socket class template provides asynchronous and blocking
 * datagram-oriented socket functionality.
 *
 * @par Thread Safety
 * @e Distinct @e objects: Safe.@n
 * @e Shared @e objects: Unsafe.
 */
template <typename Protocol,
    typename DatagramSocketService = datagram_socket_service<Protocol> >
class basic_datagram_socket
  : public basic_socket<Protocol, DatagramSocketService>
{
public:
  /// The native representation of a socket.
  typedef typename DatagramSocketService::native_type native_type;

  /// The protocol type.
  typedef Protocol protocol_type;

  /// The endpoint type.
  typedef typename Protocol::endpoint endpoint_type;

  /// Construct a basic_datagram_socket without opening it.
  /**
   * This constructor creates a datagram socket without opening it. The open()
   * function must be called before data can be sent or received on the socket.
   *
   * @param io_service The io_service object that the datagram socket will use
   * to dispatch handlers for any asynchronous operations performed on the
   * socket.
   */
  explicit basic_datagram_socket(asio::io_service& io_service)
    : basic_socket<Protocol, DatagramSocketService>(io_service)
  {
  }

  /// Construct and open a basic_datagram_socket.
  /**
   * This constructor creates and opens a datagram socket.
   *
   * @param io_service The io_service object that the datagram socket will use
   * to dispatch handlers for any asynchronous operations performed on the
   * socket.
   *
   * @param protocol An object specifying protocol parameters to be used.
   *
   * @throws asio::system_error Thrown on failure.
   */
  basic_datagram_socket(asio::io_service& io_service,
      const protocol_type& protocol)
    : basic_socket<Protocol, DatagramSocketService>(io_service, protocol)
  {
  }

  /// Construct a basic_datagram_socket, opening it and binding it to the given
  /// local endpoint.
  /**
   * This constructor creates a datagram socket and automatically opens it bound
   * to the specified endpoint on the local machine. The protocol used is the
   * protocol associated with the given endpoint.
   *
   * @param io_service The io_service object that the datagram socket will use
   * to dispatch handlers for any asynchronous operations performed on the
   * socket.
   *
   * @param endpoint An endpoint on the local machine to which the datagram
   * socket will be bound.
   *
   * @throws asio::system_error Thrown on failure.
   */
  basic_datagram_socket(asio::io_service& io_service,
      const endpoint_type& endpoint)
    : basic_socket<Protocol, DatagramSocketService>(io_service, endpoint)
  {
  }

  /// Construct a basic_datagram_socket on an existing native socket.
  /**
   * This constructor creates a datagram socket object to hold an existing
   * native socket.
   *
   * @param io_service The io_service object that the datagram socket will use
   * to dispatch handlers for any asynchronous operations performed on the
   * socket.
   *
   * @param protocol An object specifying protocol parameters to be used.
   *
   * @param native_socket The new underlying socket implementation.
   *
   * @throws asio::system_error Thrown on failure.
   */
  basic_datagram_socket(asio::io_service& io_service,
      const protocol_type& protocol, const native_type& native_socket)
    : basic_socket<Protocol, DatagramSocketService>(
        io_service, protocol, native_socket)
  {
  }

  /// Send some data on a connected socket.
  /**
   * This function is used to send data on the datagram socket. The function
   * call will block until the data has been sent successfully or an error
   * occurs.
   *
   * @param buffers One ore more data buffers to be sent on the socket.
   *
   * @returns The number of bytes sent.
   *
   * @throws asio::system_error Thrown on failure.
   *
   * @note The send operation can only be used with a connected socket. Use
   * the send_to function to send data on an unconnected datagram socket.
   *
   * @par Example
   * To send a single data buffer use the @ref buffer function as follows:
   * @code socket.send(asio::buffer(data, size)); @endcode
   * See the @ref buffer documentation for information on sending multiple
   * buffers in one go, and how to use it with arrays, boost::array or
   * std::vector.
   */
  template <typename ConstBufferSequence>
  std::size_t send(const ConstBufferSequence& buffers)
  {
    asio::error_code ec;
    std::size_t s = this->service.send(this->implementation, buffers, 0, ec);
    asio::detail::throw_error(ec);
    return s;
  }

  /// Send some data on a connected socket.
  /**
   * This function is used to send data on the datagram socket. The function
   * call will block until the data has been sent successfully or an error
   * occurs.
   *
   * @param buffers One ore more data buffers to be sent on the socket.
   *
   * @param flags Flags specifying how the send call is to be made.
   *
   * @returns The number of bytes sent.
   *
   * @throws asio::system_error Thrown on failure.
   *
   * @note The send operation can only be used with a connected socket. Use
   * the send_to function to send data on an unconnected datagram socket.
   */
  template <typename ConstBufferSequence>
  std::size_t send(const ConstBufferSequence& buffers,
      socket_base::message_flags flags)
  {
    asio::error_code ec;
    std::size_t s = this->service.send(
        this->implementation, buffers, flags, ec);
    asio::detail::throw_error(ec);
    return s;
  }

  /// Send some data on a connected socket.
  /**
   * This function is used to send data on the datagram socket. The function
   * call will block until the data has been sent successfully or an error
   * occurs.
   *
   * @param buffers One or more data buffers to be sent on the socket.
   *
   * @param flags Flags specifying how the send call is to be made.
   *
   * @param ec Set to indicate what error occurred, if any.
   *
   * @returns The number of bytes sent.
   *
   * @note The send operation can only be used with a connected socket. Use
   * the send_to function to send data on an unconnected datagram socket.
   */
  template <typename ConstBufferSequence>
  std::size_t send(const ConstBufferSequence& buffers,
      socket_base::message_flags flags, asio::error_code& ec)
  {
    return this->service.send(this->implementation, buffers, flags, ec);
  }

  /// Start an asynchronous send on a connected socket.
  /**
   * This function is used to send data on the datagram socket. The function
   * call will block until the data has been sent successfully or an error
   * occurs.
   *
   * @param buffers One or more data buffers to be sent on the socket. Although
   * the buffers object may be copied as necessary, ownership of the underlying
   * memory blocks is retained by the caller, which must guarantee that they
   * remain valid until the handler is called.
   *
   * @param handler The handler to be called when the send operation completes.
   * Copies will be made of the handler as required. The function signature of
   * the handler must be:
   * @code void handler(
   *   const asio::error_code& error, // Result of operation.
   *   std::size_t bytes_transferred           // Number of bytes sent.
   * ); @endcode
   * Regardless of whether the asynchronous operation completes immediately or
   * not, the handler will not be invoked from within this function. Invocation
   * of the handler will be performed in a manner equivalent to using
   * asio::io_service::post().
   *
   * @note The async_send operation can only be used with a connected socket.
   * Use the async_send_to function to send data on an unconnected datagram
   * socket.
   *
   * @par Example
   * To send a single data buffer use the @ref buffer function as follows:
   * @code
   * socket.async_send(asio::buffer(data, size), handler);
   * @endcode
   * See the @ref buffer documentation for information on sending multiple
   * buffers in one go, and how to use it with arrays, boost::array or
   * std::vector.
   */
  template <typename ConstBufferSequence, typename WriteHandler>
  void async_send(const ConstBufferSequence& buffers, WriteHandler handler)
  {
    this->service.async_send(this->implementation, buffers, 0, handler);
  }

  /// Start an asynchronous send on a connected socket.
  /**
   * This function is used to send data on the datagram socket. The function
   * call will block until the data has been sent successfully or an error
   * occurs.
   *
   * @param buffers One or more data buffers to be sent on the socket. Although
   * the buffers object may be copied as necessary, ownership of the underlying
   * memory blocks is retained by the caller, which must guarantee that they
   * remain valid until the handler is called.
   *
   * @param flags Flags specifying how the send call is to be made.