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 1 //  // basic_stream_socket.hpp  // ~~~~~~~~~~~~~~~~~~~~~~~  //  // Copyright (c) 2003-2015 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_BASIC_STREAM_SOCKET_HPP  #define BOOST_ASIO_BASIC_STREAM_SOCKET_HPP  #if defined(_MSC_VER) && (_MSC_VER >= 1200)  # pragma once  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)  #include  #include  #include  #include  #include  #include  #include  #include  #include  namespace boost {  namespace asio {  /// Provides stream-oriented socket functionality.  /**   * The basic_stream_socket class template provides asynchronous and blocking   * stream-oriented socket functionality.   *   * @par Thread Safety   * @e Distinct @e objects: Safe.@n   * @e Shared @e objects: Unsafe.   *   * @par Concepts:   * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.   */  template >  class basic_stream_socket   : public basic_socket  {  public:   /// (Deprecated: Use native_handle_type.) The native representation of a   /// socket.   typedef typename StreamSocketService::native_handle_type native_type;   /// The native representation of a socket.   typedef typename StreamSocketService::native_handle_type native_handle_type;   /// The protocol type.   typedef Protocol protocol_type;   /// The endpoint type.   typedef typename Protocol::endpoint endpoint_type;   /// Construct a basic_stream_socket without opening it.   /**   * This constructor creates a stream socket without opening it. The socket   * needs to be opened and then connected or accepted before data can be sent   * or received on it.   *   * @param io_service The io_service object that the stream socket will use to   * dispatch handlers for any asynchronous operations performed on the socket.   */   explicit basic_stream_socket(boost::asio::io_service& io_service)   : basic_socket(io_service)   {   }   /// Construct and open a basic_stream_socket.   /**   * This constructor creates and opens a stream socket. The socket needs to be   * connected or accepted before data can be sent or received on it.   *   * @param io_service The io_service object that the stream 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 boost::system::system_error Thrown on failure.   */   basic_stream_socket(boost::asio::io_service& io_service,   const protocol_type& protocol)   : basic_socket(io_service, protocol)   {   }   /// Construct a basic_stream_socket, opening it and binding it to the given   /// local endpoint.   /**   * This constructor creates a stream 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 stream 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 stream   * socket will be bound.   *   * @throws boost::system::system_error Thrown on failure.   */   basic_stream_socket(boost::asio::io_service& io_service,   const endpoint_type& endpoint)   : basic_socket(io_service, endpoint)   {   }   /// Construct a basic_stream_socket on an existing native socket.   /**   * This constructor creates a stream socket object to hold an existing native   * socket.   *   * @param io_service The io_service object that the stream 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 boost::system::system_error Thrown on failure.   */   basic_stream_socket(boost::asio::io_service& io_service,   const protocol_type& protocol, const native_handle_type& native_socket)   : basic_socket(   io_service, protocol, native_socket)   {   }  #if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)   /// Move-construct a basic_stream_socket from another.   /**   * This constructor moves a stream socket from one object to another.   *   * @param other The other basic_stream_socket object from which the move   * will occur.   *   * @note Following the move, the moved-from object is in the same state as if   * constructed using the @c basic_stream_socket(io_service&) constructor.   */   basic_stream_socket(basic_stream_socket&& other)   : basic_socket(   BOOST_ASIO_MOVE_CAST(basic_stream_socket)(other))   {   }   /// Move-assign a basic_stream_socket from another.   /**   * This assignment operator moves a stream socket from one object to another.   *   * @param other The other basic_stream_socket object from which the move   * will occur.   *   * @note Following the move, the moved-from object is in the same state as if   * constructed using the @c basic_stream_socket(io_service&) constructor.   */   basic_stream_socket& operator=(basic_stream_socket&& other)   {   basic_socket::operator=(   BOOST_ASIO_MOVE_CAST(basic_stream_socket)(other));   return *this;   }   /// Move-construct a basic_stream_socket from a socket of another protocol   /// type.   /**   * This constructor moves a stream socket from one object to another.   *   * @param other The other basic_stream_socket object from which the move   * will occur.   *   * @note Following the move, the moved-from object is in the same state as if   * constructed using the @c basic_stream_socket(io_service&) constructor.   */   template   basic_stream_socket(   basic_stream_socket&& other,   typename enable_if::value>::type* = 0)   : basic_socket(   BOOST_ASIO_MOVE_CAST2(basic_stream_socket<   Protocol1, StreamSocketService1>)(other))   {   }   /// Move-assign a basic_stream_socket from a socket of another protocol type.   /**   * This assignment operator moves a stream socket from one object to another.   *   * @param other The other basic_stream_socket object from which the move   * will occur.   *   * @note Following the move, the moved-from object is in the same state as if   * constructed using the @c basic_stream_socket(io_service&) constructor.   */   template   typename enable_if::value,   basic_stream_socket>::type& operator=(   basic_stream_socket&& other)   {   basic_socket::operator=(   BOOST_ASIO_MOVE_CAST2(basic_stream_socket<   Protocol1, StreamSocketService1>)(other));   return *this;   }  #endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)   /// Send some data on the socket.   /**   * This function is used to send data on the stream socket. The function   * call will block until one or more bytes of the data has been sent   * successfully, or an until error occurs.   *   * @param buffers One or more data buffers to be sent on the socket.   *   * @returns The number of bytes sent.   *   * @throws boost::system::system_error Thrown on failure.   *   * @note The send operation may not transmit all of the data to the peer.   * Consider using the @ref write function if you need to ensure that all data   * is written before the blocking operation completes.   *   * @par Example   * To send a single data buffer use the @ref buffer function as follows:   * @code   * socket.send(boost::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   std::size_t send(const ConstBufferSequence& buffers)   {   boost::system::error_code ec;   std::size_t s = this->get_service().send(   this->get_implementation(), buffers, 0, ec);   boost::asio::detail::throw_error(ec, "send");   return s;   }   /// Send some data on the socket.   /**   * This function is used to send data on the stream socket. The function   * call will block until one or more bytes of the data has been sent   * successfully, or an until 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.   *   * @returns The number of bytes sent.   *   * @throws boost::system::system_error Thrown on failure.   *   * @note The send operation may not transmit all of the data to the peer.   * Consider using the @ref write function if you need to ensure that all data   * is written before the blocking operation completes.   *   * @par Example   * To send a single data buffer use the @ref buffer function as follows:   * @code   * socket.send(boost::asio::buffer(data, size), 0);   * @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   std::size_t send(const ConstBufferSequence& buffers,   socket_base::message_flags flags)   {   boost::system::error_code ec;   std::size_t s = this->get_service().send(   this->get_implementation(), buffers, flags, ec);   boost::asio::detail::throw_error(ec, "send");   return s;   }   /// Send some data on the socket.   /**   * This function is used to send data on the stream socket. The function   * call will block until one or more bytes of the data has been sent   * successfully, or an until 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. Returns 0 if an error occurred.   *   * @note The send operation may not transmit all of the data to the peer.   * Consider using the @ref write function if you need to ensure that all data   * is written before the blocking operation completes.   */   template   std::size_t send(const ConstBufferSequence& buffers,   socket_base::message_flags flags, boost::system::error_code& ec)   {   return this->get_service().send(   this->get_implementation(), buffers, flags, ec);   }   /// Start an asynchronous send.   /**   * This function is used to asynchronously send data on the stream socket.   * The function call always returns immediately.   *   * @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 boost::system::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   * boost::asio::io_service::post().   *   * @note The send operation may not transmit all of the data to the peer.   * Consider using the @ref async_write function if you need to ensure that all   * data is written before the asynchronous operation completes.   *   * @par Example   * To send a single data buffer use the @ref buffer function as follows:   * @code   * socket.async_send(boost::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   BOOST_ASIO_INITFN_RESULT_TYPE(WriteHandler,   void (boost::system::error_code, std::size_t))   async_send(const ConstBufferSequence& buffers,   BOOST_ASIO_MOVE_ARG(WriteHandler) handler)   {   // If you get an error on the following line it means that your handler does   // not meet the documented type requirements for a WriteHandler.   BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;   return this->get_service().async_send(   this->get_implementation(), buffers, 0,   BOOST_ASIO_MOVE_CAST(WriteHandler)(handler));   }   /// Start an asynchronous send.   /**   * This function is used to asynchronously send data on the stream socket.   * The function call always returns immediately.   *   * @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.   *   * @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 boost::system::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   * boost::asio::io_service::post().   *   * @note The send operation may not transmit all of the data to the peer.   * Consider using the @ref async_write function if you need to ensure that all   * data is written before the asynchronous operation completes.   *   * @par Example   * To send a single data buffer use the @ref buffer function as follows:   * @code   * socket.async_send(boost::asio::buffer(data, size), 0, 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   BOOST_ASIO_INITFN_RESULT_TYPE(WriteHandler,   void (boost::system::error_code, std::size_t))   async_send(const ConstBufferSequence& buffers,   socket_base::message_flags flags,   BOOST_ASIO_MOVE_ARG(WriteHandler) handler)   {   // If you get an error on the following line it means that your handler does   // not meet the documented type requirements for a WriteHandler.   BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;   return this->get_service().async_send(   this->get_implementation(), buffers, flags,   BOOST_ASIO_MOVE_CAST(WriteHandler)(handler));   }   /// Receive some data on the socket.   /**   * This function is used to receive data on the stream socket. The function   * call will block until one or more bytes of data has been received   * successfully, or until an error occurs.   *   * @param buffers One or more buffers into which the data will be received.   *   * @returns The number of bytes received.   *   * @throws boost::system::system_error Thrown on failure. An error code of   * boost::asio::error::eof indicates that the connection was closed by the   * peer.   *   * @note The receive operation may not receive all of the requested number of   * bytes. Consider using the @ref read function if you need to ensure that the   * requested amount of data is read before the blocking operation completes.   *   * @par Example   * To receive into a single data buffer use the @ref buffer function as   * follows:   * @code   * socket.receive(boost::asio::buffer(data, size));   * @endcode   * See the @ref buffer documentation for information on receiving into   * multiple buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   */   template   std::size_t receive(const MutableBufferSequence& buffers)   {   boost::system::error_code ec;   std::size_t s = this->get_service().receive(   this->get_implementation(), buffers, 0, ec);   boost::asio::detail::throw_error(ec, "receive");   return s;   }   /// Receive some data on the socket.   /**   * This function is used to receive data on the stream socket. The function   * call will block until one or more bytes of data has been received   * successfully, or until an error occurs.   *   * @param buffers One or more buffers into which the data will be received.   *   * @param flags Flags specifying how the receive call is to be made.   *   * @returns The number of bytes received.   *   * @throws boost::system::system_error Thrown on failure. An error code of   * boost::asio::error::eof indicates that the connection was closed by the   * peer.   *   * @note The receive operation may not receive all of the requested number of   * bytes. Consider using the @ref read function if you need to ensure that the   * requested amount of data is read before the blocking operation completes.   *   * @par Example   * To receive into a single data buffer use the @ref buffer function as   * follows:   * @code   * socket.receive(boost::asio::buffer(data, size), 0);   * @endcode   * See the @ref buffer documentation for information on receiving into   * multiple buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   */   template   std::size_t receive(const MutableBufferSequence& buffers,   socket_base::message_flags flags)   {   boost::system::error_code ec;   std::size_t s = this->get_service().receive(   this->get_implementation(), buffers, flags, ec);   boost::asio::detail::throw_error(ec, "receive");   return s;   }   /// Receive some data on a connected socket.   /**   * This function is used to receive data on the stream socket. The function   * call will block until one or more bytes of data has been received   * successfully, or until an error occurs.   *   * @param buffers One or more buffers into which the data will be received.   *   * @param flags Flags specifying how the receive call is to be made.   *   * @param ec Set to indicate what error occurred, if any.   *   * @returns The number of bytes received. Returns 0 if an error occurred.   *   * @note The receive operation may not receive all of the requested number of   * bytes. Consider using the @ref read function if you need to ensure that the   * requested amount of data is read before the blocking operation completes.   */   template   std::size_t receive(const MutableBufferSequence& buffers,   socket_base::message_flags flags, boost::system::error_code& ec)   {   return this->get_service().receive(   this->get_implementation(), buffers, flags, ec);   }   /// Start an asynchronous receive.   /**   * This function is used to asynchronously receive data from the stream   * socket. The function call always returns immediately.   *   * @param buffers One or more buffers into which the data will be received.   * 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 receive operation   * completes. Copies will be made of the handler as required. The function   * signature of the handler must be:   * @code void handler(   * const boost::system::error_code& error, // Result of operation.   * std::size_t bytes_transferred // Number of bytes received.   * ); @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   * boost::asio::io_service::post().   *   * @note The receive operation may not receive all of the requested number of   * bytes. Consider using the @ref async_read function if you need to ensure   * that the requested amount of data is received before the asynchronous   * operation completes.   *   * @par Example   * To receive into a single data buffer use the @ref buffer function as   * follows:   * @code   * socket.async_receive(boost::asio::buffer(data, size), handler);   * @endcode   * See the @ref buffer documentation for information on receiving into   * multiple buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   */   template   BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,   void (boost::system::error_code, std::size_t))   async_receive(const MutableBufferSequence& buffers,   BOOST_ASIO_MOVE_ARG(ReadHandler) handler)   {   // If you get an error on the following line it means that your handler does   // not meet the documented type requirements for a ReadHandler.   BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;   return this->get_service().async_receive(this->get_implementation(),   buffers, 0, BOOST_ASIO_MOVE_CAST(ReadHandler)(handler));   }   /// Start an asynchronous receive.   /**   * This function is used to asynchronously receive data from the stream   * socket. The function call always returns immediately.   *   * @param buffers One or more buffers into which the data will be received.   * 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 receive call is to be made.   *   * @param handler The handler to be called when the receive operation   * completes. Copies will be made of the handler as required. The function   * signature of the handler must be:   * @code void handler(   * const boost::system::error_code& error, // Result of operation.   * std::size_t bytes_transferred // Number of bytes received.   * ); @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   * boost::asio::io_service::post().   *   * @note The receive operation may not receive all of the requested number of   * bytes. Consider using the @ref async_read function if you need to ensure   * that the requested amount of data is received before the asynchronous   * operation completes.   *   * @par Example   * To receive into a single data buffer use the @ref buffer function as   * follows:   * @code   * socket.async_receive(boost::asio::buffer(data, size), 0, handler);   * @endcode   * See the @ref buffer documentation for information on receiving into   * multiple buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   */   template   BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,   void (boost::system::error_code, std::size_t))   async_receive(const MutableBufferSequence& buffers,   socket_base::message_flags flags,   BOOST_ASIO_MOVE_ARG(ReadHandler) handler)   {   // If you get an error on the following line it means that your handler does   // not meet the documented type requirements for a ReadHandler.   BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;   return this->get_service().async_receive(this->get_implementation(),   buffers, flags, BOOST_ASIO_MOVE_CAST(ReadHandler)(handler));   }   /// Write some data to the socket.   /**   * This function is used to write data to the stream socket. The function call   * will block until one or more bytes of the data has been written   * successfully, or until an error occurs.   *   * @param buffers One or more data buffers to be written to the socket.   *   * @returns The number of bytes written.   *   * @throws boost::system::system_error Thrown on failure. An error code of   * boost::asio::error::eof indicates that the connection was closed by the   * peer.   *   * @note The write_some operation may not transmit all of the data to the   * peer. Consider using the @ref write function if you need to ensure that   * all data is written before the blocking operation completes.   *   * @par Example   * To write a single data buffer use the @ref buffer function as follows:   * @code   * socket.write_some(boost::asio::buffer(data, size));   * @endcode   * See the @ref buffer documentation for information on writing multiple   * buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   */   template   std::size_t write_some(const ConstBufferSequence& buffers)   {   boost::system::error_code ec;   std::size_t s = this->get_service().send(   this->get_implementation(), buffers, 0, ec);   boost::asio::detail::throw_error(ec, "write_some");   return s;   }   /// Write some data to the socket.   /**   * This function is used to write data to the stream socket. The function call   * will block until one or more bytes of the data has been written   * successfully, or until an error occurs.   *   * @param buffers One or more data buffers to be written to the socket.   *   * @param ec Set to indicate what error occurred, if any.   *   * @returns The number of bytes written. Returns 0 if an error occurred.   *   * @note The write_some operation may not transmit all of the data to the   * peer. Consider using the @ref write function if you need to ensure that   * all data is written before the blocking operation completes.   */   template   std::size_t write_some(const ConstBufferSequence& buffers,   boost::system::error_code& ec)   {   return this->get_service().send(this->get_implementation(), buffers, 0, ec);   }   /// Start an asynchronous write.   /**   * This function is used to asynchronously write data to the stream socket.   * The function call always returns immediately.   *   * @param buffers One or more data buffers to be written to 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 write operation completes.   * Copies will be made of the handler as required. The function signature of   * the handler must be:   * @code void handler(   * const boost::system::error_code& error, // Result of operation.   * std::size_t bytes_transferred // Number of bytes written.   * ); @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   * boost::asio::io_service::post().   *   * @note The write operation may not transmit all of the data to the peer.   * Consider using the @ref async_write function if you need to ensure that all   * data is written before the asynchronous operation completes.   *   * @par Example   * To write a single data buffer use the @ref buffer function as follows:   * @code   * socket.async_write_some(boost::asio::buffer(data, size), handler);   * @endcode   * See the @ref buffer documentation for information on writing multiple   * buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   */   template   BOOST_ASIO_INITFN_RESULT_TYPE(WriteHandler,   void (boost::system::error_code, std::size_t))   async_write_some(const ConstBufferSequence& buffers,   BOOST_ASIO_MOVE_ARG(WriteHandler) handler)   {   // If you get an error on the following line it means that your handler does   // not meet the documented type requirements for a WriteHandler.   BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;   return this->get_service().async_send(this->get_implementation(),   buffers, 0, BOOST_ASIO_MOVE_CAST(WriteHandler)(handler));   }   /// Read some data from the socket.   /**   * This function is used to read data from the stream socket. The function   * call will block until one or more bytes of data has been read successfully,   * or until an error occurs.   *   * @param buffers One or more buffers into which the data will be read.   *   * @returns The number of bytes read.   *   * @throws boost::system::system_error Thrown on failure. An error code of   * boost::asio::error::eof indicates that the connection was closed by the   * peer.   *   * @note The read_some operation may not read all of the requested number of   * bytes. Consider using the @ref read function if you need to ensure that   * the requested amount of data is read before the blocking operation   * completes.   *   * @par Example   * To read into a single data buffer use the @ref buffer function as follows:   * @code   * socket.read_some(boost::asio::buffer(data, size));   * @endcode   * See the @ref buffer documentation for information on reading into multiple   * buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   */   template   std::size_t read_some(const MutableBufferSequence& buffers)   {   boost::system::error_code ec;   std::size_t s = this->get_service().receive(   this->get_implementation(), buffers, 0, ec);   boost::asio::detail::throw_error(ec, "read_some");   return s;   }   /// Read some data from the socket.   /**   * This function is used to read data from the stream socket. The function   * call will block until one or more bytes of data has been read successfully,   * or until an error occurs.   *   * @param buffers One or more buffers into which the data will be read.   *   * @param ec Set to indicate what error occurred, if any.   *   * @returns The number of bytes read. Returns 0 if an error occurred.   *   * @note The read_some operation may not read all of the requested number of   * bytes. Consider using the @ref read function if you need to ensure that   * the requested amount of data is read before the blocking operation   * completes.   */   template   std::size_t read_some(const MutableBufferSequence& buffers,   boost::system::error_code& ec)   {   return this->get_service().receive(   this->get_implementation(), buffers, 0, ec);   }   /// Start an asynchronous read.   /**   * This function is used to asynchronously read data from the stream socket.   * The function call always returns immediately.   *   * @param buffers One or more buffers into which the data will be read.   * 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 read operation completes.   * Copies will be made of the handler as required. The function signature of   * the handler must be:   * @code void handler(   * const boost::system::error_code& error, // Result of operation.   * std::size_t bytes_transferred // Number of bytes read.   * ); @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   * boost::asio::io_service::post().   *   * @note The read operation may not read all of the requested number of bytes.   * Consider using the @ref async_read function if you need to ensure that the   * requested amount of data is read before the asynchronous operation   * completes.   *   * @par Example   * To read into a single data buffer use the @ref buffer function as follows:   * @code   * socket.async_read_some(boost::asio::buffer(data, size), handler);   * @endcode   * See the @ref buffer documentation for information on reading into multiple   * buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   */   template   BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,   void (boost::system::error_code, std::size_t))   async_read_some(const MutableBufferSequence& buffers,   BOOST_ASIO_MOVE_ARG(ReadHandler) handler)   {   // If you get an error on the following line it means that your handler does   // not meet the documented type requirements for a ReadHandler.   BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;   return this->get_service().async_receive(this->get_implementation(),   buffers, 0, BOOST_ASIO_MOVE_CAST(ReadHandler)(handler));   }  };  } // namespace asio  } // namespace boost  #include  #endif // BOOST_ASIO_BASIC_STREAM_SOCKET_HPP