ceph/src/boost/boost/asio/basic_seq_packet_socket.hpp

   1 //
   2 // basic_seq_packet_socket.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_BASIC_SEQ_PACKET_SOCKET_HPP
  12 #define BOOST_ASIO_BASIC_SEQ_PACKET_SOCKET_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19 #include <cstddef>
  20 #include <boost/asio/basic_socket.hpp>
  21 #include <boost/asio/detail/handler_type_requirements.hpp>
  22 #include <boost/asio/detail/throw_error.hpp>
  23 #include <boost/asio/error.hpp>
  24
  25 #include <boost/asio/detail/push_options.hpp>
  26
  27 namespace boost {
  28 namespace asio {
  29
  30 #if !defined(BOOST_ASIO_BASIC_SEQ_PACKET_SOCKET_FWD_DECL)
  31 #define BOOST_ASIO_BASIC_SEQ_PACKET_SOCKET_FWD_DECL
  32
  33 // Forward declaration with defaulted arguments.
  34 template <typename Protocol, typename Executor = any_io_executor>
  35 class basic_seq_packet_socket;
  36
  37 #endif // !defined(BOOST_ASIO_BASIC_SEQ_PACKET_SOCKET_FWD_DECL)
  38
  39 /// Provides sequenced packet socket functionality.
  40 /**
  41  * The basic_seq_packet_socket class template provides asynchronous and blocking
  42  * sequenced packet socket functionality.
  43  *
  44  * @par Thread Safety
  45  * @e Distinct @e objects: Safe.@n
  46  * @e Shared @e objects: Unsafe.
  47  */
  48 template <typename Protocol, typename Executor>
  49 class basic_seq_packet_socket
  50   : public basic_socket<Protocol, Executor>
  51 {
  52 public:
  53   /// The type of the executor associated with the object.
  54   typedef Executor executor_type;
  55
  56   /// Rebinds the socket type to another executor.
  57   template <typename Executor1>
  58   struct rebind_executor
  59   {
  60     /// The socket type when rebound to the specified executor.
  61     typedef basic_seq_packet_socket<Protocol, Executor1> other;
  62   };
  63
  64   /// The native representation of a socket.
  65 #if defined(GENERATING_DOCUMENTATION)
  66   typedef implementation_defined native_handle_type;
  67 #else
  68   typedef typename basic_socket<Protocol,
  69     Executor>::native_handle_type native_handle_type;
  70 #endif
  71
  72   /// The protocol type.
  73   typedef Protocol protocol_type;
  74
  75   /// The endpoint type.
  76   typedef typename Protocol::endpoint endpoint_type;
  77
  78   /// Construct a basic_seq_packet_socket without opening it.
  79   /**
  80    * This constructor creates a sequenced packet socket without opening it. The
  81    * socket needs to be opened and then connected or accepted before data can
  82    * be sent or received on it.
  83    *
  84    * @param ex The I/O executor that the socket will use, by default, to
  85    * dispatch handlers for any asynchronous operations performed on the socket.
  86    */
  87   explicit basic_seq_packet_socket(const executor_type& ex)
  88     : basic_socket<Protocol, Executor>(ex)
  89   {
  90   }
  91
  92   /// Construct a basic_seq_packet_socket without opening it.
  93   /**
  94    * This constructor creates a sequenced packet socket without opening it. The
  95    * socket needs to be opened and then connected or accepted before data can
  96    * be sent or received on it.
  97    *
  98    * @param context An execution context which provides the I/O executor that
  99    * the socket will use, by default, to dispatch handlers for any asynchronous
 100    * operations performed on the socket.
 101    */
 102   template <typename ExecutionContext>
 103   explicit basic_seq_packet_socket(ExecutionContext& context,
 104       typename enable_if<
 105         is_convertible<ExecutionContext&, execution_context&>::value
 106       >::type* = 0)
 107     : basic_socket<Protocol, Executor>(context)
 108   {
 109   }
 110
 111   /// Construct and open a basic_seq_packet_socket.
 112   /**
 113    * This constructor creates and opens a sequenced_packet socket. The socket
 114    * needs to be connected or accepted before data can be sent or received on
 115    * it.
 116    *
 117    * @param ex The I/O executor that the socket will use, by default, to
 118    * dispatch handlers for any asynchronous operations performed on the socket.
 119    *
 120    * @param protocol An object specifying protocol parameters to be used.
 121    *
 122    * @throws boost::system::system_error Thrown on failure.
 123    */
 124   basic_seq_packet_socket(const executor_type& ex,
 125       const protocol_type& protocol)
 126     : basic_socket<Protocol, Executor>(ex, protocol)
 127   {
 128   }
 129
 130   /// Construct and open a basic_seq_packet_socket.
 131   /**
 132    * This constructor creates and opens a sequenced_packet socket. The socket
 133    * needs to be connected or accepted before data can be sent or received on
 134    * it.
 135    *
 136    * @param context An execution context which provides the I/O executor that
 137    * the socket will use, by default, to dispatch handlers for any asynchronous
 138    * operations performed on the socket.
 139    *
 140    * @param protocol An object specifying protocol parameters to be used.
 141    *
 142    * @throws boost::system::system_error Thrown on failure.
 143    */
 144   template <typename ExecutionContext>
 145   basic_seq_packet_socket(ExecutionContext& context,
 146       const protocol_type& protocol,
 147       typename enable_if<
 148         is_convertible<ExecutionContext&, execution_context&>::value
 149       >::type* = 0)
 150     : basic_socket<Protocol, Executor>(context, protocol)
 151   {
 152   }
 153
 154   /// Construct a basic_seq_packet_socket, opening it and binding it to the
 155   /// given local endpoint.
 156   /**
 157    * This constructor creates a sequenced packet socket and automatically opens
 158    * it bound to the specified endpoint on the local machine. The protocol used
 159    * is the protocol associated with the given endpoint.
 160    *
 161    * @param ex The I/O executor that the socket will use, by default, to
 162    * dispatch handlers for any asynchronous operations performed on the socket.
 163    *
 164    * @param endpoint An endpoint on the local machine to which the sequenced
 165    * packet socket will be bound.
 166    *
 167    * @throws boost::system::system_error Thrown on failure.
 168    */
 169   basic_seq_packet_socket(const executor_type& ex,
 170       const endpoint_type& endpoint)
 171     : basic_socket<Protocol, Executor>(ex, endpoint)
 172   {
 173   }
 174
 175   /// Construct a basic_seq_packet_socket, opening it and binding it to the
 176   /// given local endpoint.
 177   /**
 178    * This constructor creates a sequenced packet socket and automatically opens
 179    * it bound to the specified endpoint on the local machine. The protocol used
 180    * is the protocol associated with the given endpoint.
 181    *
 182    * @param context An execution context which provides the I/O executor that
 183    * the socket will use, by default, to dispatch handlers for any asynchronous
 184    * operations performed on the socket.
 185    *
 186    * @param endpoint An endpoint on the local machine to which the sequenced
 187    * packet socket will be bound.
 188    *
 189    * @throws boost::system::system_error Thrown on failure.
 190    */
 191   template <typename ExecutionContext>
 192   basic_seq_packet_socket(ExecutionContext& context,
 193       const endpoint_type& endpoint,
 194       typename enable_if<
 195         is_convertible<ExecutionContext&, execution_context&>::value
 196       >::type* = 0)
 197     : basic_socket<Protocol, Executor>(context, endpoint)
 198   {
 199   }
 200
 201   /// Construct a basic_seq_packet_socket on an existing native socket.
 202   /**
 203    * This constructor creates a sequenced packet socket object to hold an
 204    * existing native socket.
 205    *
 206    * @param ex The I/O executor that the socket will use, by default, to
 207    * dispatch handlers for any asynchronous operations performed on the socket.
 208    *
 209    * @param protocol An object specifying protocol parameters to be used.
 210    *
 211    * @param native_socket The new underlying socket implementation.
 212    *
 213    * @throws boost::system::system_error Thrown on failure.
 214    */
 215   basic_seq_packet_socket(const executor_type& ex,
 216       const protocol_type& protocol, const native_handle_type& native_socket)
 217     : basic_socket<Protocol, Executor>(ex, protocol, native_socket)
 218   {
 219   }
 220
 221   /// Construct a basic_seq_packet_socket on an existing native socket.
 222   /**
 223    * This constructor creates a sequenced packet socket object to hold an
 224    * existing native socket.
 225    *
 226    * @param context An execution context which provides the I/O executor that
 227    * the socket will use, by default, to dispatch handlers for any asynchronous
 228    * operations performed on the socket.
 229    *
 230    * @param protocol An object specifying protocol parameters to be used.
 231    *
 232    * @param native_socket The new underlying socket implementation.
 233    *
 234    * @throws boost::system::system_error Thrown on failure.
 235    */
 236   template <typename ExecutionContext>
 237   basic_seq_packet_socket(ExecutionContext& context,
 238       const protocol_type& protocol, const native_handle_type& native_socket,
 239       typename enable_if<
 240         is_convertible<ExecutionContext&, execution_context&>::value
 241       >::type* = 0)
 242     : basic_socket<Protocol, Executor>(context, protocol, native_socket)
 243   {
 244   }
 245
 246 #if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
 247   /// Move-construct a basic_seq_packet_socket from another.
 248   /**
 249    * This constructor moves a sequenced packet socket from one object to
 250    * another.
 251    *
 252    * @param other The other basic_seq_packet_socket object from which the move
 253    * will occur.
 254    *
 255    * @note Following the move, the moved-from object is in the same state as if
 256    * constructed using the @c basic_seq_packet_socket(const executor_type&)
 257    * constructor.
 258    */
 259   basic_seq_packet_socket(basic_seq_packet_socket&& other) BOOST_ASIO_NOEXCEPT
 260     : basic_socket<Protocol, Executor>(std::move(other))
 261   {
 262   }
 263
 264   /// Move-assign a basic_seq_packet_socket from another.
 265   /**
 266    * This assignment operator moves a sequenced packet socket from one object to
 267    * another.
 268    *
 269    * @param other The other basic_seq_packet_socket object from which the move
 270    * will occur.
 271    *
 272    * @note Following the move, the moved-from object is in the same state as if
 273    * constructed using the @c basic_seq_packet_socket(const executor_type&)
 274    * constructor.
 275    */
 276   basic_seq_packet_socket& operator=(basic_seq_packet_socket&& other)
 277   {
 278     basic_socket<Protocol, Executor>::operator=(std::move(other));
 279     return *this;
 280   }
 281
 282   /// Move-construct a basic_seq_packet_socket from a socket of another protocol
 283   /// type.
 284   /**
 285    * This constructor moves a sequenced packet socket from one object to
 286    * another.
 287    *
 288    * @param other The other basic_seq_packet_socket object from which the move
 289    * will occur.
 290    *
 291    * @note Following the move, the moved-from object is in the same state as if
 292    * constructed using the @c basic_seq_packet_socket(const executor_type&)
 293    * constructor.
 294    */
 295   template <typename Protocol1, typename Executor1>
 296   basic_seq_packet_socket(basic_seq_packet_socket<Protocol1, Executor1>&& other,
 297       typename enable_if<
 298         is_convertible<Protocol1, Protocol>::value
 299           && is_convertible<Executor1, Executor>::value
 300       >::type* = 0)
 301     : basic_socket<Protocol, Executor>(std::move(other))
 302   {
 303   }
 304
 305   /// Move-assign a basic_seq_packet_socket from a socket of another protocol
 306   /// type.
 307   /**
 308    * This assignment operator moves a sequenced packet socket from one object to
 309    * another.
 310    *
 311    * @param other The other basic_seq_packet_socket object from which the move
 312    * will occur.
 313    *
 314    * @note Following the move, the moved-from object is in the same state as if
 315    * constructed using the @c basic_seq_packet_socket(const executor_type&)
 316    * constructor.
 317    */
 318   template <typename Protocol1, typename Executor1>
 319   typename enable_if<
 320     is_convertible<Protocol1, Protocol>::value
 321       && is_convertible<Executor1, Executor>::value,
 322     basic_seq_packet_socket&
 323   >::type operator=(basic_seq_packet_socket<Protocol1, Executor1>&& other)
 324   {
 325     basic_socket<Protocol, Executor>::operator=(std::move(other));
 326     return *this;
 327   }
 328 #endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
 329
 330   /// Destroys the socket.
 331   /**
 332    * This function destroys the socket, cancelling any outstanding asynchronous
 333    * operations associated with the socket as if by calling @c cancel.
 334    */
 335   ~basic_seq_packet_socket()
 336   {
 337   }
 338
 339   /// Send some data on the socket.
 340   /**
 341    * This function is used to send data on the sequenced packet socket. The
 342    * function call will block until the data has been sent successfully, or an
 343    * until error occurs.
 344    *
 345    * @param buffers One or more data buffers to be sent on the socket.
 346    *
 347    * @param flags Flags specifying how the send call is to be made.
 348    *
 349    * @returns The number of bytes sent.
 350    *
 351    * @throws boost::system::system_error Thrown on failure.
 352    *
 353    * @par Example
 354    * To send a single data buffer use the @ref buffer function as follows:
 355    * @code
 356    * socket.send(boost::asio::buffer(data, size), 0);
 357    * @endcode
 358    * See the @ref buffer documentation for information on sending multiple
 359    * buffers in one go, and how to use it with arrays, boost::array or
 360    * std::vector.
 361    */
 362   template <typename ConstBufferSequence>
 363   std::size_t send(const ConstBufferSequence& buffers,
 364       socket_base::message_flags flags)
 365   {
 366     boost::system::error_code ec;
 367     std::size_t s = this->impl_.get_service().send(
 368         this->impl_.get_implementation(), buffers, flags, ec);
 369     boost::asio::detail::throw_error(ec, "send");
 370     return s;
 371   }
 372
 373   /// Send some data on the socket.
 374   /**
 375    * This function is used to send data on the sequenced packet socket. The
 376    * function call will block the data has been sent successfully, or an until
 377    * error occurs.
 378    *
 379    * @param buffers One or more data buffers to be sent on the socket.
 380    *
 381    * @param flags Flags specifying how the send call is to be made.
 382    *
 383    * @param ec Set to indicate what error occurred, if any.
 384    *
 385    * @returns The number of bytes sent. Returns 0 if an error occurred.
 386    *
 387    * @note The send operation may not transmit all of the data to the peer.
 388    * Consider using the @ref write function if you need to ensure that all data
 389    * is written before the blocking operation completes.
 390    */
 391   template <typename ConstBufferSequence>
 392   std::size_t send(const ConstBufferSequence& buffers,
 393       socket_base::message_flags flags, boost::system::error_code& ec)
 394   {
 395     return this->impl_.get_service().send(
 396         this->impl_.get_implementation(), buffers, flags, ec);
 397   }
 398
 399   /// Start an asynchronous send.
 400   /**
 401    * This function is used to asynchronously send data on the sequenced packet
 402    * socket. The function call always returns immediately.
 403    *
 404    * @param buffers One or more data buffers to be sent on the socket. Although
 405    * the buffers object may be copied as necessary, ownership of the underlying
 406    * memory blocks is retained by the caller, which must guarantee that they
 407    * remain valid until the handler is called.
 408    *
 409    * @param flags Flags specifying how the send call is to be made.
 410    *
 411    * @param handler The handler to be called when the send operation completes.
 412    * Copies will be made of the handler as required. The function signature of
 413    * the handler must be:
 414    * @code void handler(
 415    *   const boost::system::error_code& error, // Result of operation.
 416    *   std::size_t bytes_transferred           // Number of bytes sent.
 417    * ); @endcode
 418    * Regardless of whether the asynchronous operation completes immediately or
 419    * not, the handler will not be invoked from within this function. On
 420    * immediate completion, invocation of the handler will be performed in a
 421    * manner equivalent to using boost::asio::post().
 422    *
 423    * @par Example
 424    * To send a single data buffer use the @ref buffer function as follows:
 425    * @code
 426    * socket.async_send(boost::asio::buffer(data, size), 0, handler);
 427    * @endcode
 428    * See the @ref buffer documentation for information on sending multiple
 429    * buffers in one go, and how to use it with arrays, boost::array or
 430    * std::vector.
 431    */
 432   template <typename ConstBufferSequence,
 433       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
 434         std::size_t)) WriteHandler
 435           BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
 436   BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(WriteHandler,
 437       void (boost::system::error_code, std::size_t))
 438   async_send(const ConstBufferSequence& buffers,
 439       socket_base::message_flags flags,
 440       BOOST_ASIO_MOVE_ARG(WriteHandler) handler
 441         BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
 442   {
 443     return async_initiate<WriteHandler,
 444       void (boost::system::error_code, std::size_t)>(
 445         initiate_async_send(this), handler, buffers, flags);
 446   }
 447
 448   /// Receive some data on the socket.
 449   /**
 450    * This function is used to receive data on the sequenced packet socket. The
 451    * function call will block until data has been received successfully, or
 452    * until an error occurs.
 453    *
 454    * @param buffers One or more buffers into which the data will be received.
 455    *
 456    * @param out_flags After the receive call completes, contains flags
 457    * associated with the received data. For example, if the
 458    * socket_base::message_end_of_record bit is set then the received data marks
 459    * the end of a record.
 460    *
 461    * @returns The number of bytes received.
 462    *
 463    * @throws boost::system::system_error Thrown on failure. An error code of
 464    * boost::asio::error::eof indicates that the connection was closed by the
 465    * peer.
 466    *
 467    * @par Example
 468    * To receive into a single data buffer use the @ref buffer function as
 469    * follows:
 470    * @code
 471    * socket.receive(boost::asio::buffer(data, size), out_flags);
 472    * @endcode
 473    * See the @ref buffer documentation for information on receiving into
 474    * multiple buffers in one go, and how to use it with arrays, boost::array or
 475    * std::vector.
 476    */
 477   template <typename MutableBufferSequence>
 478   std::size_t receive(const MutableBufferSequence& buffers,
 479       socket_base::message_flags& out_flags)
 480   {
 481     boost::system::error_code ec;
 482     std::size_t s = this->impl_.get_service().receive_with_flags(
 483         this->impl_.get_implementation(), buffers, 0, out_flags, ec);
 484     boost::asio::detail::throw_error(ec, "receive");
 485     return s;
 486   }
 487
 488   /// Receive some data on the socket.
 489   /**
 490    * This function is used to receive data on the sequenced packet socket. The
 491    * function call will block until data has been received successfully, or
 492    * until an error occurs.
 493    *
 494    * @param buffers One or more buffers into which the data will be received.
 495    *
 496    * @param in_flags Flags specifying how the receive call is to be made.
 497    *
 498    * @param out_flags After the receive call completes, contains flags
 499    * associated with the received data. For example, if the
 500    * socket_base::message_end_of_record bit is set then the received data marks
 501    * the end of a record.
 502    *
 503    * @returns The number of bytes received.
 504    *
 505    * @throws boost::system::system_error Thrown on failure. An error code of
 506    * boost::asio::error::eof indicates that the connection was closed by the
 507    * peer.
 508    *
 509    * @note The receive operation may not receive all of the requested number of
 510    * bytes. Consider using the @ref read function if you need to ensure that the
 511    * requested amount of data is read before the blocking operation completes.
 512    *
 513    * @par Example
 514    * To receive into a single data buffer use the @ref buffer function as
 515    * follows:
 516    * @code
 517    * socket.receive(boost::asio::buffer(data, size), 0, out_flags);
 518    * @endcode
 519    * See the @ref buffer documentation for information on receiving into
 520    * multiple buffers in one go, and how to use it with arrays, boost::array or
 521    * std::vector.
 522    */
 523   template <typename MutableBufferSequence>
 524   std::size_t receive(const MutableBufferSequence& buffers,
 525       socket_base::message_flags in_flags,
 526       socket_base::message_flags& out_flags)
 527   {
 528     boost::system::error_code ec;
 529     std::size_t s = this->impl_.get_service().receive_with_flags(
 530         this->impl_.get_implementation(), buffers, in_flags, out_flags, ec);
 531     boost::asio::detail::throw_error(ec, "receive");
 532     return s;
 533   }
 534
 535   /// Receive some data on a connected socket.
 536   /**
 537    * This function is used to receive data on the sequenced packet socket. The
 538    * function call will block until data has been received successfully, or
 539    * until an error occurs.
 540    *
 541    * @param buffers One or more buffers into which the data will be received.
 542    *
 543    * @param in_flags Flags specifying how the receive call is to be made.
 544    *
 545    * @param out_flags After the receive call completes, contains flags
 546    * associated with the received data. For example, if the
 547    * socket_base::message_end_of_record bit is set then the received data marks
 548    * the end of a record.
 549    *
 550    * @param ec Set to indicate what error occurred, if any.
 551    *
 552    * @returns The number of bytes received. Returns 0 if an error occurred.
 553    *
 554    * @note The receive operation may not receive all of the requested number of
 555    * bytes. Consider using the @ref read function if you need to ensure that the
 556    * requested amount of data is read before the blocking operation completes.
 557    */
 558   template <typename MutableBufferSequence>
 559   std::size_t receive(const MutableBufferSequence& buffers,
 560       socket_base::message_flags in_flags,
 561       socket_base::message_flags& out_flags, boost::system::error_code& ec)
 562   {
 563     return this->impl_.get_service().receive_with_flags(
 564         this->impl_.get_implementation(), buffers, in_flags, out_flags, ec);
 565   }
 566
 567   /// Start an asynchronous receive.
 568   /**
 569    * This function is used to asynchronously receive data from the sequenced
 570    * packet socket. The function call always returns immediately.
 571    *
 572    * @param buffers One or more buffers into which the data will be received.
 573    * Although the buffers object may be copied as necessary, ownership of the
 574    * underlying memory blocks is retained by the caller, which must guarantee
 575    * that they remain valid until the handler is called.
 576    *
 577    * @param out_flags Once the asynchronous operation completes, contains flags
 578    * associated with the received data. For example, if the
 579    * socket_base::message_end_of_record bit is set then the received data marks
 580    * the end of a record. The caller must guarantee that the referenced
 581    * variable remains valid until the handler is called.
 582    *
 583    * @param handler The handler to be called when the receive operation
 584    * completes. Copies will be made of the handler as required. The function
 585    * signature of the handler must be:
 586    * @code void handler(
 587    *   const boost::system::error_code& error, // Result of operation.
 588    *   std::size_t bytes_transferred           // Number of bytes received.
 589    * ); @endcode
 590    * Regardless of whether the asynchronous operation completes immediately or
 591    * not, the handler will not be invoked from within this function. On
 592    * immediate completion, invocation of the handler will be performed in a
 593    * manner equivalent to using boost::asio::post().
 594    *
 595    * @par Example
 596    * To receive into a single data buffer use the @ref buffer function as
 597    * follows:
 598    * @code
 599    * socket.async_receive(boost::asio::buffer(data, size), out_flags, handler);
 600    * @endcode
 601    * See the @ref buffer documentation for information on receiving into
 602    * multiple buffers in one go, and how to use it with arrays, boost::array or
 603    * std::vector.
 604    */
 605   template <typename MutableBufferSequence,
 606       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
 607         std::size_t)) ReadHandler
 608           BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
 609   BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
 610       void (boost::system::error_code, std::size_t))
 611   async_receive(const MutableBufferSequence& buffers,
 612       socket_base::message_flags& out_flags,
 613       BOOST_ASIO_MOVE_ARG(ReadHandler) handler
 614         BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
 615   {
 616     return async_initiate<ReadHandler,
 617       void (boost::system::error_code, std::size_t)>(
 618         initiate_async_receive_with_flags(this), handler,
 619         buffers, socket_base::message_flags(0), &out_flags);
 620   }
 621
 622   /// Start an asynchronous receive.
 623   /**
 624    * This function is used to asynchronously receive data from the sequenced
 625    * data socket. The function call always returns immediately.
 626    *
 627    * @param buffers One or more buffers into which the data will be received.
 628    * Although the buffers object may be copied as necessary, ownership of the
 629    * underlying memory blocks is retained by the caller, which must guarantee
 630    * that they remain valid until the handler is called.
 631    *
 632    * @param in_flags Flags specifying how the receive call is to be made.
 633    *
 634    * @param out_flags Once the asynchronous operation completes, contains flags
 635    * associated with the received data. For example, if the
 636    * socket_base::message_end_of_record bit is set then the received data marks
 637    * the end of a record. The caller must guarantee that the referenced
 638    * variable remains valid until the handler is called.
 639    *
 640    * @param handler The handler to be called when the receive operation
 641    * completes. Copies will be made of the handler as required. The function
 642    * signature of the handler must be:
 643    * @code void handler(
 644    *   const boost::system::error_code& error, // Result of operation.
 645    *   std::size_t bytes_transferred           // Number of bytes received.
 646    * ); @endcode
 647    * Regardless of whether the asynchronous operation completes immediately or
 648    * not, the handler will not be invoked from within this function. On
 649    * immediate completion, invocation of the handler will be performed in a
 650    * manner equivalent to using boost::asio::post().
 651    *
 652    * @par Example
 653    * To receive into a single data buffer use the @ref buffer function as
 654    * follows:
 655    * @code
 656    * socket.async_receive(
 657    *     boost::asio::buffer(data, size),
 658    *     0, out_flags, handler);
 659    * @endcode
 660    * See the @ref buffer documentation for information on receiving into
 661    * multiple buffers in one go, and how to use it with arrays, boost::array or
 662    * std::vector.
 663    */
 664   template <typename MutableBufferSequence,
 665       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
 666         std::size_t)) ReadHandler
 667           BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
 668   BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
 669       void (boost::system::error_code, std::size_t))
 670   async_receive(const MutableBufferSequence& buffers,
 671       socket_base::message_flags in_flags,
 672       socket_base::message_flags& out_flags,
 673       BOOST_ASIO_MOVE_ARG(ReadHandler) handler
 674         BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
 675   {
 676     return async_initiate<ReadHandler,
 677       void (boost::system::error_code, std::size_t)>(
 678         initiate_async_receive_with_flags(this),
 679         handler, buffers, in_flags, &out_flags);
 680   }
 681
 682 private:
 683   // Disallow copying and assignment.
 684   basic_seq_packet_socket(const basic_seq_packet_socket&) BOOST_ASIO_DELETED;
 685   basic_seq_packet_socket& operator=(
 686       const basic_seq_packet_socket&) BOOST_ASIO_DELETED;
 687
 688   class initiate_async_send
 689   {
 690   public:
 691     typedef Executor executor_type;
 692
 693     explicit initiate_async_send(basic_seq_packet_socket* self)
 694       : self_(self)
 695     {
 696     }
 697
 698     executor_type get_executor() const BOOST_ASIO_NOEXCEPT
 699     {
 700       return self_->get_executor();
 701     }
 702
 703     template <typename WriteHandler, typename ConstBufferSequence>
 704     void operator()(BOOST_ASIO_MOVE_ARG(WriteHandler) handler,
 705         const ConstBufferSequence& buffers,
 706         socket_base::message_flags flags) const
 707     {
 708       // If you get an error on the following line it means that your handler
 709       // does not meet the documented type requirements for a WriteHandler.
 710       BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
 711
 712       detail::non_const_lvalue<WriteHandler> handler2(handler);
 713       self_->impl_.get_service().async_send(
 714           self_->impl_.get_implementation(), buffers, flags,
 715           handler2.value, self_->impl_.get_executor());
 716     }
 717
 718   private:
 719     basic_seq_packet_socket* self_;
 720   };
 721
 722   class initiate_async_receive_with_flags
 723   {
 724   public:
 725     typedef Executor executor_type;
 726
 727     explicit initiate_async_receive_with_flags(basic_seq_packet_socket* self)
 728       : self_(self)
 729     {
 730     }
 731
 732     executor_type get_executor() const BOOST_ASIO_NOEXCEPT
 733     {
 734       return self_->get_executor();
 735     }
 736
 737     template <typename ReadHandler, typename MutableBufferSequence>
 738     void operator()(BOOST_ASIO_MOVE_ARG(ReadHandler) handler,
 739         const MutableBufferSequence& buffers,
 740         socket_base::message_flags in_flags,
 741         socket_base::message_flags* out_flags) const
 742     {
 743       // If you get an error on the following line it means that your handler
 744       // does not meet the documented type requirements for a ReadHandler.
 745       BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
 746
 747       detail::non_const_lvalue<ReadHandler> handler2(handler);
 748       self_->impl_.get_service().async_receive_with_flags(
 749           self_->impl_.get_implementation(), buffers, in_flags,
 750           *out_flags, handler2.value, self_->impl_.get_executor());
 751     }
 752
 753   private:
 754     basic_seq_packet_socket* self_;
 755   };
 756 };
 757
 758 } // namespace asio
 759 } // namespace boost
 760
 761 #include <boost/asio/detail/pop_options.hpp>
 762
 763 #endif // BOOST_ASIO_BASIC_SEQ_PACKET_SOCKET_HPP