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diff --git a/lib/asio/basic_seq_packet_socket.hpp b/lib/asio/basic_seq_packet_socket.hpp
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--- a/lib/asio/basic_seq_packet_socket.hpp
+++ /dev/null
@@ -1,618 +0,0 @@
-//
-// basic_seq_packet_socket.hpp
-// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 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_SEQ_PACKET_SOCKET_HPP
-#define ASIO_BASIC_SEQ_PACKET_SOCKET_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include <cstddef>
-#include "asio/basic_socket.hpp"
-#include "asio/detail/handler_type_requirements.hpp"
-#include "asio/detail/throw_error.hpp"
-#include "asio/error.hpp"
-
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-# include "asio/seq_packet_socket_service.hpp"
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-/// Provides sequenced packet socket functionality.
-/**
- * The basic_seq_packet_socket class template provides asynchronous and blocking
- * sequenced packet socket functionality.
- *
- * @par Thread Safety
- * @e Distinct @e objects: Safe.@n
- * @e Shared @e objects: Unsafe.
- */
-template <typename Protocol
-    ASIO_SVC_TPARAM_DEF1(= seq_packet_socket_service<Protocol>)>
-class basic_seq_packet_socket
-  : public basic_socket<Protocol ASIO_SVC_TARG>
-{
-public:
-  /// The native representation of a socket.
-#if defined(GENERATING_DOCUMENTATION)
-  typedef implementation_defined native_handle_type;
-#else
-  typedef typename basic_socket<
-    Protocol ASIO_SVC_TARG>::native_handle_type native_handle_type;
-#endif
-
-  /// The protocol type.
-  typedef Protocol protocol_type;
-
-  /// The endpoint type.
-  typedef typename Protocol::endpoint endpoint_type;
-
-  /// Construct a basic_seq_packet_socket without opening it.
-  /**
-   * This constructor creates a sequenced packet 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_context The io_context object that the sequenced packet socket
-   * will use to dispatch handlers for any asynchronous operations performed on
-   * the socket.
-   */
-  explicit basic_seq_packet_socket(asio::io_context& io_context)
-    : basic_socket<Protocol ASIO_SVC_TARG>(io_context)
-  {
-  }
-
-  /// Construct and open a basic_seq_packet_socket.
-  /**
-   * This constructor creates and opens a sequenced_packet socket. The socket
-   * needs to be connected or accepted before data can be sent or received on
-   * it.
-   *
-   * @param io_context The io_context object that the sequenced packet 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_seq_packet_socket(asio::io_context& io_context,
-      const protocol_type& protocol)
-    : basic_socket<Protocol ASIO_SVC_TARG>(io_context, protocol)
-  {
-  }
-
-  /// Construct a basic_seq_packet_socket, opening it and binding it to the
-  /// given local endpoint.
-  /**
-   * This constructor creates a sequenced packet 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_context The io_context object that the sequenced packet 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 sequenced
-   * packet socket will be bound.
-   *
-   * @throws asio::system_error Thrown on failure.
-   */
-  basic_seq_packet_socket(asio::io_context& io_context,
-      const endpoint_type& endpoint)
-    : basic_socket<Protocol ASIO_SVC_TARG>(io_context, endpoint)
-  {
-  }
-
-  /// Construct a basic_seq_packet_socket on an existing native socket.
-  /**
-   * This constructor creates a sequenced packet socket object to hold an
-   * existing native socket.
-   *
-   * @param io_context The io_context object that the sequenced packet 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_seq_packet_socket(asio::io_context& io_context,
-      const protocol_type& protocol, const native_handle_type& native_socket)
-    : basic_socket<Protocol ASIO_SVC_TARG>(
-        io_context, protocol, native_socket)
-  {
-  }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-  /// Move-construct a basic_seq_packet_socket from another.
-  /**
-   * This constructor moves a sequenced packet socket from one object to
-   * another.
-   *
-   * @param other The other basic_seq_packet_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_seq_packet_socket(io_context&) constructor.
-   */
-  basic_seq_packet_socket(basic_seq_packet_socket&& other)
-    : basic_socket<Protocol ASIO_SVC_TARG>(std::move(other))
-  {
-  }
-
-  /// Move-assign a basic_seq_packet_socket from another.
-  /**
-   * This assignment operator moves a sequenced packet socket from one object to
-   * another.
-   *
-   * @param other The other basic_seq_packet_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_seq_packet_socket(io_context&) constructor.
-   */
-  basic_seq_packet_socket& operator=(basic_seq_packet_socket&& other)
-  {
-    basic_socket<Protocol ASIO_SVC_TARG>::operator=(std::move(other));
-    return *this;
-  }
-
-  /// Move-construct a basic_seq_packet_socket from a socket of another protocol
-  /// type.
-  /**
-   * This constructor moves a sequenced packet socket from one object to
-   * another.
-   *
-   * @param other The other basic_seq_packet_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_seq_packet_socket(io_context&) constructor.
-   */
-  template <typename Protocol1 ASIO_SVC_TPARAM1>
-  basic_seq_packet_socket(
-      basic_seq_packet_socket<Protocol1 ASIO_SVC_TARG1>&& other,
-      typename enable_if<is_convertible<Protocol1, Protocol>::value>::type* = 0)
-    : basic_socket<Protocol ASIO_SVC_TARG>(std::move(other))
-  {
-  }
-
-  /// Move-assign a basic_seq_packet_socket from a socket of another protocol
-  /// type.
-  /**
-   * This assignment operator moves a sequenced packet socket from one object to
-   * another.
-   *
-   * @param other The other basic_seq_packet_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_seq_packet_socket(io_context&) constructor.
-   */
-  template <typename Protocol1 ASIO_SVC_TPARAM1>
-  typename enable_if<is_convertible<Protocol1, Protocol>::value,
-      basic_seq_packet_socket>::type& operator=(
-        basic_seq_packet_socket<Protocol1 ASIO_SVC_TARG1>&& other)
-  {
-    basic_socket<Protocol ASIO_SVC_TARG>::operator=(std::move(other));
-    return *this;
-  }
-#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
-  /// Destroys the socket.
-  /**
-   * This function destroys the socket, cancelling any outstanding asynchronous
-   * operations associated with the socket as if by calling @c cancel.
-   */
-  ~basic_seq_packet_socket()
-  {
-  }
-
-  /// Send some data on the socket.
-  /**
-   * This function is used to send data on the sequenced packet socket. The
-   * function call will block until 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 asio::system_error Thrown on failure.
-   *
-   * @par Example
-   * To send a single data buffer use the @ref buffer function as follows:
-   * @code
-   * socket.send(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 <typename ConstBufferSequence>
-  std::size_t send(const ConstBufferSequence& buffers,
-      socket_base::message_flags flags)
-  {
-    asio::error_code ec;
-    std::size_t s = this->get_service().send(
-        this->get_implementation(), buffers, flags, ec);
-    asio::detail::throw_error(ec, "send");
-    return s;
-  }
-
-  /// Send some data on the socket.
-  /**
-   * This function is used to send data on the sequenced packet socket. The
-   * function call will block 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 <typename ConstBufferSequence>
-  std::size_t send(const ConstBufferSequence& buffers,
-      socket_base::message_flags flags, asio::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 sequenced packet
-   * 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 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_context::post().
-   *
-   * @par Example
-   * To send a single data buffer use the @ref buffer function as follows:
-   * @code
-   * socket.async_send(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 <typename ConstBufferSequence, typename WriteHandler>
-  ASIO_INITFN_RESULT_TYPE(WriteHandler,
-      void (asio::error_code, std::size_t))
-  async_send(const ConstBufferSequence& buffers,
-      socket_base::message_flags flags,
-      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.
-    ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
-
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-    return this->get_service().async_send(this->get_implementation(),
-        buffers, flags, ASIO_MOVE_CAST(WriteHandler)(handler));
-#else // defined(ASIO_ENABLE_OLD_SERVICES)
-    async_completion<WriteHandler,
-      void (asio::error_code, std::size_t)> init(handler);
-
-    this->get_service().async_send(this->get_implementation(),
-        buffers, flags, init.completion_handler);
-
-    return init.result.get();
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-  }
-
-  /// Receive some data on the socket.
-  /**
-   * This function is used to receive data on the sequenced packet socket. The
-   * function call will block until data has been received successfully, or
-   * until an error occurs.
-   *
-   * @param buffers One or more buffers into which the data will be received.
-   *
-   * @param out_flags After the receive call completes, contains flags
-   * associated with the received data. For example, if the
-   * socket_base::message_end_of_record bit is set then the received data marks
-   * the end of a record.
-   *
-   * @returns The number of bytes received.
-   *
-   * @throws asio::system_error Thrown on failure. An error code of
-   * asio::error::eof indicates that the connection was closed by the
-   * peer.
-   *
-   * @par Example
-   * To receive into a single data buffer use the @ref buffer function as
-   * follows:
-   * @code
-   * socket.receive(asio::buffer(data, size), out_flags);
-   * @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 <typename MutableBufferSequence>
-  std::size_t receive(const MutableBufferSequence& buffers,
-      socket_base::message_flags& out_flags)
-  {
-    asio::error_code ec;
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-    std::size_t s = this->get_service().receive(
-        this->get_implementation(), buffers, 0, out_flags, ec);
-#else // defined(ASIO_ENABLE_OLD_SERVICES)
-    std::size_t s = this->get_service().receive_with_flags(
-        this->get_implementation(), buffers, 0, out_flags, ec);
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-    asio::detail::throw_error(ec, "receive");
-    return s;
-  }
-
-  /// Receive some data on the socket.
-  /**
-   * This function is used to receive data on the sequenced packet socket. The
-   * function call will block until data has been received successfully, or
-   * until an error occurs.
-   *
-   * @param buffers One or more buffers into which the data will be received.
-   *
-   * @param in_flags Flags specifying how the receive call is to be made.
-   *
-   * @param out_flags After the receive call completes, contains flags
-   * associated with the received data. For example, if the
-   * socket_base::message_end_of_record bit is set then the received data marks
-   * the end of a record.
-   *
-   * @returns The number of bytes received.
-   *
-   * @throws asio::system_error Thrown on failure. An error code of
-   * 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(asio::buffer(data, size), 0, out_flags);
-   * @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 <typename MutableBufferSequence>
-  std::size_t receive(const MutableBufferSequence& buffers,
-      socket_base::message_flags in_flags,
-      socket_base::message_flags& out_flags)
-  {
-    asio::error_code ec;
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-    std::size_t s = this->get_service().receive(
-        this->get_implementation(), buffers, in_flags, out_flags, ec);
-#else // defined(ASIO_ENABLE_OLD_SERVICES)
-    std::size_t s = this->get_service().receive_with_flags(
-        this->get_implementation(), buffers, in_flags, out_flags, ec);
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-    asio::detail::throw_error(ec, "receive");
-    return s;
-  }
-
-  /// Receive some data on a connected socket.
-  /**
-   * This function is used to receive data on the sequenced packet socket. The
-   * function call will block until data has been received successfully, or
-   * until an error occurs.
-   *
-   * @param buffers One or more buffers into which the data will be received.
-   *
-   * @param in_flags Flags specifying how the receive call is to be made.
-   *
-   * @param out_flags After the receive call completes, contains flags
-   * associated with the received data. For example, if the
-   * socket_base::message_end_of_record bit is set then the received data marks
-   * the end of a record.
-   *
-   * @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 <typename MutableBufferSequence>
-  std::size_t receive(const MutableBufferSequence& buffers,
-      socket_base::message_flags in_flags,
-      socket_base::message_flags& out_flags, asio::error_code& ec)
-  {
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-    return this->get_service().receive(this->get_implementation(),
-        buffers, in_flags, out_flags, ec);
-#else // defined(ASIO_ENABLE_OLD_SERVICES)
-    return this->get_service().receive_with_flags(this->get_implementation(),
-        buffers, in_flags, out_flags, ec);
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-  }
-
-  /// Start an asynchronous receive.
-  /**
-   * This function is used to asynchronously receive data from the sequenced
-   * packet 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 out_flags Once the asynchronous operation completes, contains flags
-   * associated with the received data. For example, if the
-   * socket_base::message_end_of_record bit is set then the received data marks
-   * the end of a record. The caller must guarantee that the referenced
-   * variable remains 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 asio::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
-   * asio::io_context::post().
-   *
-   * @par Example
-   * To receive into a single data buffer use the @ref buffer function as
-   * follows:
-   * @code
-   * socket.async_receive(asio::buffer(data, size), out_flags, 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 <typename MutableBufferSequence, typename ReadHandler>
-  ASIO_INITFN_RESULT_TYPE(ReadHandler,
-      void (asio::error_code, std::size_t))
-  async_receive(const MutableBufferSequence& buffers,
-      socket_base::message_flags& out_flags,
-      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.
-    ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
-
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-    return this->get_service().async_receive(
-        this->get_implementation(), buffers, 0, out_flags,
-        ASIO_MOVE_CAST(ReadHandler)(handler));
-#else // defined(ASIO_ENABLE_OLD_SERVICES)
-    async_completion<ReadHandler,
-      void (asio::error_code, std::size_t)> init(handler);
-
-    this->get_service().async_receive_with_flags(
-        this->get_implementation(), buffers, 0, out_flags,
-        init.completion_handler);
-
-    return init.result.get();
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-  }
-
-  /// Start an asynchronous receive.
-  /**
-   * This function is used to asynchronously receive data from the sequenced
-   * data 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 in_flags Flags specifying how the receive call is to be made.
-   *
-   * @param out_flags Once the asynchronous operation completes, contains flags
-   * associated with the received data. For example, if the
-   * socket_base::message_end_of_record bit is set then the received data marks
-   * the end of a record. The caller must guarantee that the referenced
-   * variable remains 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 asio::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
-   * asio::io_context::post().
-   *
-   * @par Example
-   * To receive into a single data buffer use the @ref buffer function as
-   * follows:
-   * @code
-   * socket.async_receive(
-   *     asio::buffer(data, size),
-   *     0, out_flags, 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 <typename MutableBufferSequence, typename ReadHandler>
-  ASIO_INITFN_RESULT_TYPE(ReadHandler,
-      void (asio::error_code, std::size_t))
-  async_receive(const MutableBufferSequence& buffers,
-      socket_base::message_flags in_flags,
-      socket_base::message_flags& out_flags,
-      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.
-    ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
-
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-    return this->get_service().async_receive(
-        this->get_implementation(), buffers, in_flags, out_flags,
-        ASIO_MOVE_CAST(ReadHandler)(handler));
-#else // defined(ASIO_ENABLE_OLD_SERVICES)
-    async_completion<ReadHandler,
-      void (asio::error_code, std::size_t)> init(handler);
-
-    this->get_service().async_receive_with_flags(
-        this->get_implementation(), buffers, in_flags, out_flags,
-        init.completion_handler);
-
-    return init.result.get();
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-  }
-};
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_BASIC_SEQ_PACKET_SOCKET_HPP