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diff --git a/lib/asio/basic_socket.hpp b/lib/asio/basic_socket.hpp
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--- a/lib/asio/basic_socket.hpp
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@@ -1,1757 +0,0 @@
-//
-// basic_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_SOCKET_HPP
-#define ASIO_BASIC_SOCKET_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include "asio/async_result.hpp"
-#include "asio/basic_io_object.hpp"
-#include "asio/detail/handler_type_requirements.hpp"
-#include "asio/detail/throw_error.hpp"
-#include "asio/detail/type_traits.hpp"
-#include "asio/error.hpp"
-#include "asio/post.hpp"
-#include "asio/socket_base.hpp"
-
-#if defined(ASIO_HAS_MOVE)
-# include <utility>
-#endif // defined(ASIO_HAS_MOVE)
-
-#if !defined(ASIO_ENABLE_OLD_SERVICES)
-# if defined(ASIO_WINDOWS_RUNTIME)
-#  include "asio/detail/winrt_ssocket_service.hpp"
-#  define ASIO_SVC_T detail::winrt_ssocket_service<Protocol>
-# elif defined(ASIO_HAS_IOCP)
-#  include "asio/detail/win_iocp_socket_service.hpp"
-#  define ASIO_SVC_T detail::win_iocp_socket_service<Protocol>
-# else
-#  include "asio/detail/reactive_socket_service.hpp"
-#  define ASIO_SVC_T detail::reactive_socket_service<Protocol>
-# endif
-#endif // !defined(ASIO_ENABLE_OLD_SERVICES)
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-/// Provides socket functionality.
-/**
- * The basic_socket class template provides functionality that is common to both
- * stream-oriented and datagram-oriented sockets.
- *
- * @par Thread Safety
- * @e Distinct @e objects: Safe.@n
- * @e Shared @e objects: Unsafe.
- */
-template <typename Protocol ASIO_SVC_TPARAM>
-class basic_socket
-  : ASIO_SVC_ACCESS basic_io_object<ASIO_SVC_T>,
-    public socket_base
-{
-public:
-  /// The type of the executor associated with the object.
-  typedef io_context::executor_type executor_type;
-
-  /// The native representation of a socket.
-#if defined(GENERATING_DOCUMENTATION)
-  typedef implementation_defined native_handle_type;
-#else
-  typedef typename ASIO_SVC_T::native_handle_type native_handle_type;
-#endif
-
-  /// The protocol type.
-  typedef Protocol protocol_type;
-
-  /// The endpoint type.
-  typedef typename Protocol::endpoint endpoint_type;
-
-#if !defined(ASIO_NO_EXTENSIONS)
-  /// A basic_socket is always the lowest layer.
-  typedef basic_socket<Protocol ASIO_SVC_TARG> lowest_layer_type;
-#endif // !defined(ASIO_NO_EXTENSIONS)
-
-  /// Construct a basic_socket without opening it.
-  /**
-   * This constructor creates a socket without opening it.
-   *
-   * @param io_context The io_context object that the socket will use to
-   * dispatch handlers for any asynchronous operations performed on the socket.
-   */
-  explicit basic_socket(asio::io_context& io_context)
-    : basic_io_object<ASIO_SVC_T>(io_context)
-  {
-  }
-
-  /// Construct and open a basic_socket.
-  /**
-   * This constructor creates and opens a socket.
-   *
-   * @param io_context The io_context object that the 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_socket(asio::io_context& io_context,
-      const protocol_type& protocol)
-    : basic_io_object<ASIO_SVC_T>(io_context)
-  {
-    asio::error_code ec;
-    this->get_service().open(this->get_implementation(), protocol, ec);
-    asio::detail::throw_error(ec, "open");
-  }
-
-  /// Construct a basic_socket, opening it and binding it to the given local
-  /// endpoint.
-  /**
-   * This constructor creates a 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 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 socket will
-   * be bound.
-   *
-   * @throws asio::system_error Thrown on failure.
-   */
-  basic_socket(asio::io_context& io_context,
-      const endpoint_type& endpoint)
-    : basic_io_object<ASIO_SVC_T>(io_context)
-  {
-    asio::error_code ec;
-    const protocol_type protocol = endpoint.protocol();
-    this->get_service().open(this->get_implementation(), protocol, ec);
-    asio::detail::throw_error(ec, "open");
-    this->get_service().bind(this->get_implementation(), endpoint, ec);
-    asio::detail::throw_error(ec, "bind");
-  }
-
-  /// Construct a basic_socket on an existing native socket.
-  /**
-   * This constructor creates a socket object to hold an existing native socket.
-   *
-   * @param io_context The io_context object that the 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 A native socket.
-   *
-   * @throws asio::system_error Thrown on failure.
-   */
-  basic_socket(asio::io_context& io_context,
-      const protocol_type& protocol, const native_handle_type& native_socket)
-    : basic_io_object<ASIO_SVC_T>(io_context)
-  {
-    asio::error_code ec;
-    this->get_service().assign(this->get_implementation(),
-        protocol, native_socket, ec);
-    asio::detail::throw_error(ec, "assign");
-  }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-  /// Move-construct a basic_socket from another.
-  /**
-   * This constructor moves a socket from one object to another.
-   *
-   * @param other The other basic_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_socket(io_context&) constructor.
-   */
-  basic_socket(basic_socket&& other)
-    : basic_io_object<ASIO_SVC_T>(std::move(other))
-  {
-  }
-
-  /// Move-assign a basic_socket from another.
-  /**
-   * This assignment operator moves a socket from one object to another.
-   *
-   * @param other The other basic_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_socket(io_context&) constructor.
-   */
-  basic_socket& operator=(basic_socket&& other)
-  {
-    basic_io_object<ASIO_SVC_T>::operator=(std::move(other));
-    return *this;
-  }
-
-  // All sockets have access to each other's implementations.
-  template <typename Protocol1 ASIO_SVC_TPARAM1>
-  friend class basic_socket;
-
-  /// Move-construct a basic_socket from a socket of another protocol type.
-  /**
-   * This constructor moves a socket from one object to another.
-   *
-   * @param other The other basic_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_socket(io_context&) constructor.
-   */
-  template <typename Protocol1 ASIO_SVC_TPARAM1>
-  basic_socket(basic_socket<Protocol1 ASIO_SVC_TARG1>&& other,
-      typename enable_if<is_convertible<Protocol1, Protocol>::value>::type* = 0)
-    : basic_io_object<ASIO_SVC_T>(
-        other.get_service(), other.get_implementation())
-  {
-  }
-
-  /// Move-assign a basic_socket from a socket of another protocol type.
-  /**
-   * This assignment operator moves a socket from one object to another.
-   *
-   * @param other The other basic_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_socket(io_context&) constructor.
-   */
-  template <typename Protocol1 ASIO_SVC_TPARAM1>
-  typename enable_if<is_convertible<Protocol1, Protocol>::value,
-      basic_socket>::type& operator=(
-        basic_socket<Protocol1 ASIO_SVC_TARG1>&& other)
-  {
-    basic_socket tmp(std::move(other));
-    basic_io_object<ASIO_SVC_T>::operator=(std::move(tmp));
-    return *this;
-  }
-#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-  // These functions are provided by basic_io_object<>.
-#else // defined(ASIO_ENABLE_OLD_SERVICES)
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use get_executor().) Get the io_context associated with the
-  /// object.
-  /**
-   * This function may be used to obtain the io_context object that the I/O
-   * object uses to dispatch handlers for asynchronous operations.
-   *
-   * @return A reference to the io_context object that the I/O object will use
-   * to dispatch handlers. Ownership is not transferred to the caller.
-   */
-  asio::io_context& get_io_context()
-  {
-    return basic_io_object<ASIO_SVC_T>::get_io_context();
-  }
-
-  /// (Deprecated: Use get_executor().) Get the io_context associated with the
-  /// object.
-  /**
-   * This function may be used to obtain the io_context object that the I/O
-   * object uses to dispatch handlers for asynchronous operations.
-   *
-   * @return A reference to the io_context object that the I/O object will use
-   * to dispatch handlers. Ownership is not transferred to the caller.
-   */
-  asio::io_context& get_io_service()
-  {
-    return basic_io_object<ASIO_SVC_T>::get_io_service();
-  }
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-  /// Get the executor associated with the object.
-  executor_type get_executor() ASIO_NOEXCEPT
-  {
-    return basic_io_object<ASIO_SVC_T>::get_executor();
-  }
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-
-#if !defined(ASIO_NO_EXTENSIONS)
-  /// Get a reference to the lowest layer.
-  /**
-   * This function returns a reference to the lowest layer in a stack of
-   * layers. Since a basic_socket cannot contain any further layers, it simply
-   * returns a reference to itself.
-   *
-   * @return A reference to the lowest layer in the stack of layers. Ownership
-   * is not transferred to the caller.
-   */
-  lowest_layer_type& lowest_layer()
-  {
-    return *this;
-  }
-
-  /// Get a const reference to the lowest layer.
-  /**
-   * This function returns a const reference to the lowest layer in a stack of
-   * layers. Since a basic_socket cannot contain any further layers, it simply
-   * returns a reference to itself.
-   *
-   * @return A const reference to the lowest layer in the stack of layers.
-   * Ownership is not transferred to the caller.
-   */
-  const lowest_layer_type& lowest_layer() const
-  {
-    return *this;
-  }
-#endif // !defined(ASIO_NO_EXTENSIONS)
-
-  /// Open the socket using the specified protocol.
-  /**
-   * This function opens the socket so that it will use the specified protocol.
-   *
-   * @param protocol An object specifying protocol parameters to be used.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * socket.open(asio::ip::tcp::v4());
-   * @endcode
-   */
-  void open(const protocol_type& protocol = protocol_type())
-  {
-    asio::error_code ec;
-    this->get_service().open(this->get_implementation(), protocol, ec);
-    asio::detail::throw_error(ec, "open");
-  }
-
-  /// Open the socket using the specified protocol.
-  /**
-   * This function opens the socket so that it will use the specified protocol.
-   *
-   * @param protocol An object specifying which protocol is to be used.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * asio::error_code ec;
-   * socket.open(asio::ip::tcp::v4(), ec);
-   * if (ec)
-   * {
-   *   // An error occurred.
-   * }
-   * @endcode
-   */
-  ASIO_SYNC_OP_VOID open(const protocol_type& protocol,
-      asio::error_code& ec)
-  {
-    this->get_service().open(this->get_implementation(), protocol, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Assign an existing native socket to the socket.
-  /*
-   * This function opens the socket to hold an existing native socket.
-   *
-   * @param protocol An object specifying which protocol is to be used.
-   *
-   * @param native_socket A native socket.
-   *
-   * @throws asio::system_error Thrown on failure.
-   */
-  void assign(const protocol_type& protocol,
-      const native_handle_type& native_socket)
-  {
-    asio::error_code ec;
-    this->get_service().assign(this->get_implementation(),
-        protocol, native_socket, ec);
-    asio::detail::throw_error(ec, "assign");
-  }
-
-  /// Assign an existing native socket to the socket.
-  /*
-   * This function opens the socket to hold an existing native socket.
-   *
-   * @param protocol An object specifying which protocol is to be used.
-   *
-   * @param native_socket A native socket.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   */
-  ASIO_SYNC_OP_VOID assign(const protocol_type& protocol,
-      const native_handle_type& native_socket, asio::error_code& ec)
-  {
-    this->get_service().assign(this->get_implementation(),
-        protocol, native_socket, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Determine whether the socket is open.
-  bool is_open() const
-  {
-    return this->get_service().is_open(this->get_implementation());
-  }
-
-  /// Close the socket.
-  /**
-   * This function is used to close the socket. Any asynchronous send, receive
-   * or connect operations will be cancelled immediately, and will complete
-   * with the asio::error::operation_aborted error.
-   *
-   * @throws asio::system_error Thrown on failure. Note that, even if
-   * the function indicates an error, the underlying descriptor is closed.
-   *
-   * @note For portable behaviour with respect to graceful closure of a
-   * connected socket, call shutdown() before closing the socket.
-   */
-  void close()
-  {
-    asio::error_code ec;
-    this->get_service().close(this->get_implementation(), ec);
-    asio::detail::throw_error(ec, "close");
-  }
-
-  /// Close the socket.
-  /**
-   * This function is used to close the socket. Any asynchronous send, receive
-   * or connect operations will be cancelled immediately, and will complete
-   * with the asio::error::operation_aborted error.
-   *
-   * @param ec Set to indicate what error occurred, if any. Note that, even if
-   * the function indicates an error, the underlying descriptor is closed.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::error_code ec;
-   * socket.close(ec);
-   * if (ec)
-   * {
-   *   // An error occurred.
-   * }
-   * @endcode
-   *
-   * @note For portable behaviour with respect to graceful closure of a
-   * connected socket, call shutdown() before closing the socket.
-   */
-  ASIO_SYNC_OP_VOID close(asio::error_code& ec)
-  {
-    this->get_service().close(this->get_implementation(), ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Release ownership of the underlying native socket.
-  /**
-   * This function causes all outstanding asynchronous connect, send and receive
-   * operations to finish immediately, and the handlers for cancelled operations
-   * will be passed the asio::error::operation_aborted error. Ownership
-   * of the native socket is then transferred to the caller.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @note This function is unsupported on Windows versions prior to Windows
-   * 8.1, and will fail with asio::error::operation_not_supported on
-   * these platforms.
-   */
-#if defined(ASIO_MSVC) && (ASIO_MSVC >= 1400) \
-  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
-  __declspec(deprecated("This function always fails with "
-        "operation_not_supported when used on Windows versions "
-        "prior to Windows 8.1."))
-#endif
-  native_handle_type release()
-  {
-    asio::error_code ec;
-    native_handle_type s = this->get_service().release(
-        this->get_implementation(), ec);
-    asio::detail::throw_error(ec, "release");
-    return s;
-  }
-
-  /// Release ownership of the underlying native socket.
-  /**
-   * This function causes all outstanding asynchronous connect, send and receive
-   * operations to finish immediately, and the handlers for cancelled operations
-   * will be passed the asio::error::operation_aborted error. Ownership
-   * of the native socket is then transferred to the caller.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @note This function is unsupported on Windows versions prior to Windows
-   * 8.1, and will fail with asio::error::operation_not_supported on
-   * these platforms.
-   */
-#if defined(ASIO_MSVC) && (ASIO_MSVC >= 1400) \
-  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
-  __declspec(deprecated("This function always fails with "
-        "operation_not_supported when used on Windows versions "
-        "prior to Windows 8.1."))
-#endif
-  native_handle_type release(asio::error_code& ec)
-  {
-    return this->get_service().release(this->get_implementation(), ec);
-  }
-
-  /// Get the native socket representation.
-  /**
-   * This function may be used to obtain the underlying representation of the
-   * socket. This is intended to allow access to native socket functionality
-   * that is not otherwise provided.
-   */
-  native_handle_type native_handle()
-  {
-    return this->get_service().native_handle(this->get_implementation());
-  }
-
-  /// Cancel all asynchronous operations associated with the socket.
-  /**
-   * This function causes all outstanding asynchronous connect, send and receive
-   * operations to finish immediately, and the handlers for cancelled operations
-   * will be passed the asio::error::operation_aborted error.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @note Calls to cancel() will always fail with
-   * asio::error::operation_not_supported when run on Windows XP, Windows
-   * Server 2003, and earlier versions of Windows, unless
-   * ASIO_ENABLE_CANCELIO is defined. However, the CancelIo function has
-   * two issues that should be considered before enabling its use:
-   *
-   * @li It will only cancel asynchronous operations that were initiated in the
-   * current thread.
-   *
-   * @li It can appear to complete without error, but the request to cancel the
-   * unfinished operations may be silently ignored by the operating system.
-   * Whether it works or not seems to depend on the drivers that are installed.
-   *
-   * For portable cancellation, consider using one of the following
-   * alternatives:
-   *
-   * @li Disable asio's I/O completion port backend by defining
-   * ASIO_DISABLE_IOCP.
-   *
-   * @li Use the close() function to simultaneously cancel the outstanding
-   * operations and close the socket.
-   *
-   * When running on Windows Vista, Windows Server 2008, and later, the
-   * CancelIoEx function is always used. This function does not have the
-   * problems described above.
-   */
-#if defined(ASIO_MSVC) && (ASIO_MSVC >= 1400) \
-  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600) \
-  && !defined(ASIO_ENABLE_CANCELIO)
-  __declspec(deprecated("By default, this function always fails with "
-        "operation_not_supported when used on Windows XP, Windows Server 2003, "
-        "or earlier. Consult documentation for details."))
-#endif
-  void cancel()
-  {
-    asio::error_code ec;
-    this->get_service().cancel(this->get_implementation(), ec);
-    asio::detail::throw_error(ec, "cancel");
-  }
-
-  /// Cancel all asynchronous operations associated with the socket.
-  /**
-   * This function causes all outstanding asynchronous connect, send and receive
-   * operations to finish immediately, and the handlers for cancelled operations
-   * will be passed the asio::error::operation_aborted error.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @note Calls to cancel() will always fail with
-   * asio::error::operation_not_supported when run on Windows XP, Windows
-   * Server 2003, and earlier versions of Windows, unless
-   * ASIO_ENABLE_CANCELIO is defined. However, the CancelIo function has
-   * two issues that should be considered before enabling its use:
-   *
-   * @li It will only cancel asynchronous operations that were initiated in the
-   * current thread.
-   *
-   * @li It can appear to complete without error, but the request to cancel the
-   * unfinished operations may be silently ignored by the operating system.
-   * Whether it works or not seems to depend on the drivers that are installed.
-   *
-   * For portable cancellation, consider using one of the following
-   * alternatives:
-   *
-   * @li Disable asio's I/O completion port backend by defining
-   * ASIO_DISABLE_IOCP.
-   *
-   * @li Use the close() function to simultaneously cancel the outstanding
-   * operations and close the socket.
-   *
-   * When running on Windows Vista, Windows Server 2008, and later, the
-   * CancelIoEx function is always used. This function does not have the
-   * problems described above.
-   */
-#if defined(ASIO_MSVC) && (ASIO_MSVC >= 1400) \
-  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600) \
-  && !defined(ASIO_ENABLE_CANCELIO)
-  __declspec(deprecated("By default, this function always fails with "
-        "operation_not_supported when used on Windows XP, Windows Server 2003, "
-        "or earlier. Consult documentation for details."))
-#endif
-  ASIO_SYNC_OP_VOID cancel(asio::error_code& ec)
-  {
-    this->get_service().cancel(this->get_implementation(), ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Determine whether the socket is at the out-of-band data mark.
-  /**
-   * This function is used to check whether the socket input is currently
-   * positioned at the out-of-band data mark.
-   *
-   * @return A bool indicating whether the socket is at the out-of-band data
-   * mark.
-   *
-   * @throws asio::system_error Thrown on failure.
-   */
-  bool at_mark() const
-  {
-    asio::error_code ec;
-    bool b = this->get_service().at_mark(this->get_implementation(), ec);
-    asio::detail::throw_error(ec, "at_mark");
-    return b;
-  }
-
-  /// Determine whether the socket is at the out-of-band data mark.
-  /**
-   * This function is used to check whether the socket input is currently
-   * positioned at the out-of-band data mark.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @return A bool indicating whether the socket is at the out-of-band data
-   * mark.
-   */
-  bool at_mark(asio::error_code& ec) const
-  {
-    return this->get_service().at_mark(this->get_implementation(), ec);
-  }
-
-  /// Determine the number of bytes available for reading.
-  /**
-   * This function is used to determine the number of bytes that may be read
-   * without blocking.
-   *
-   * @return The number of bytes that may be read without blocking, or 0 if an
-   * error occurs.
-   *
-   * @throws asio::system_error Thrown on failure.
-   */
-  std::size_t available() const
-  {
-    asio::error_code ec;
-    std::size_t s = this->get_service().available(
-        this->get_implementation(), ec);
-    asio::detail::throw_error(ec, "available");
-    return s;
-  }
-
-  /// Determine the number of bytes available for reading.
-  /**
-   * This function is used to determine the number of bytes that may be read
-   * without blocking.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @return The number of bytes that may be read without blocking, or 0 if an
-   * error occurs.
-   */
-  std::size_t available(asio::error_code& ec) const
-  {
-    return this->get_service().available(this->get_implementation(), ec);
-  }
-
-  /// Bind the socket to the given local endpoint.
-  /**
-   * This function binds the socket to the specified endpoint on the local
-   * machine.
-   *
-   * @param endpoint An endpoint on the local machine to which the socket will
-   * be bound.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * socket.open(asio::ip::tcp::v4());
-   * socket.bind(asio::ip::tcp::endpoint(
-   *       asio::ip::tcp::v4(), 12345));
-   * @endcode
-   */
-  void bind(const endpoint_type& endpoint)
-  {
-    asio::error_code ec;
-    this->get_service().bind(this->get_implementation(), endpoint, ec);
-    asio::detail::throw_error(ec, "bind");
-  }
-
-  /// Bind the socket to the given local endpoint.
-  /**
-   * This function binds the socket to the specified endpoint on the local
-   * machine.
-   *
-   * @param endpoint An endpoint on the local machine to which the socket will
-   * be bound.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * socket.open(asio::ip::tcp::v4());
-   * asio::error_code ec;
-   * socket.bind(asio::ip::tcp::endpoint(
-   *       asio::ip::tcp::v4(), 12345), ec);
-   * if (ec)
-   * {
-   *   // An error occurred.
-   * }
-   * @endcode
-   */
-  ASIO_SYNC_OP_VOID bind(const endpoint_type& endpoint,
-      asio::error_code& ec)
-  {
-    this->get_service().bind(this->get_implementation(), endpoint, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Connect the socket to the specified endpoint.
-  /**
-   * This function is used to connect a socket to the specified remote endpoint.
-   * The function call will block until the connection is successfully made or
-   * an error occurs.
-   *
-   * The socket is automatically opened if it is not already open. If the
-   * connect fails, and the socket was automatically opened, the socket is
-   * not returned to the closed state.
-   *
-   * @param peer_endpoint The remote endpoint to which the socket will be
-   * connected.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * asio::ip::tcp::endpoint endpoint(
-   *     asio::ip::address::from_string("1.2.3.4"), 12345);
-   * socket.connect(endpoint);
-   * @endcode
-   */
-  void connect(const endpoint_type& peer_endpoint)
-  {
-    asio::error_code ec;
-    if (!is_open())
-    {
-      this->get_service().open(this->get_implementation(),
-          peer_endpoint.protocol(), ec);
-      asio::detail::throw_error(ec, "connect");
-    }
-    this->get_service().connect(this->get_implementation(), peer_endpoint, ec);
-    asio::detail::throw_error(ec, "connect");
-  }
-
-  /// Connect the socket to the specified endpoint.
-  /**
-   * This function is used to connect a socket to the specified remote endpoint.
-   * The function call will block until the connection is successfully made or
-   * an error occurs.
-   *
-   * The socket is automatically opened if it is not already open. If the
-   * connect fails, and the socket was automatically opened, the socket is
-   * not returned to the closed state.
-   *
-   * @param peer_endpoint The remote endpoint to which the socket will be
-   * connected.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * asio::ip::tcp::endpoint endpoint(
-   *     asio::ip::address::from_string("1.2.3.4"), 12345);
-   * asio::error_code ec;
-   * socket.connect(endpoint, ec);
-   * if (ec)
-   * {
-   *   // An error occurred.
-   * }
-   * @endcode
-   */
-  ASIO_SYNC_OP_VOID connect(const endpoint_type& peer_endpoint,
-      asio::error_code& ec)
-  {
-    if (!is_open())
-    {
-      this->get_service().open(this->get_implementation(),
-            peer_endpoint.protocol(), ec);
-      if (ec)
-      {
-        ASIO_SYNC_OP_VOID_RETURN(ec);
-      }
-    }
-
-    this->get_service().connect(this->get_implementation(), peer_endpoint, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Start an asynchronous connect.
-  /**
-   * This function is used to asynchronously connect a socket to the specified
-   * remote endpoint. The function call always returns immediately.
-   *
-   * The socket is automatically opened if it is not already open. If the
-   * connect fails, and the socket was automatically opened, the socket is
-   * not returned to the closed state.
-   *
-   * @param peer_endpoint The remote endpoint to which the socket will be
-   * connected. Copies will be made of the endpoint object as required.
-   *
-   * @param handler The handler to be called when the connection 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
-   * ); @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
-   * @code
-   * void connect_handler(const asio::error_code& error)
-   * {
-   *   if (!error)
-   *   {
-   *     // Connect succeeded.
-   *   }
-   * }
-   *
-   * ...
-   *
-   * asio::ip::tcp::socket socket(io_context);
-   * asio::ip::tcp::endpoint endpoint(
-   *     asio::ip::address::from_string("1.2.3.4"), 12345);
-   * socket.async_connect(endpoint, connect_handler);
-   * @endcode
-   */
-  template <typename ConnectHandler>
-  ASIO_INITFN_RESULT_TYPE(ConnectHandler,
-      void (asio::error_code))
-  async_connect(const endpoint_type& peer_endpoint,
-      ASIO_MOVE_ARG(ConnectHandler) handler)
-  {
-    // If you get an error on the following line it means that your handler does
-    // not meet the documented type requirements for a ConnectHandler.
-    ASIO_CONNECT_HANDLER_CHECK(ConnectHandler, handler) type_check;
-
-    if (!is_open())
-    {
-      asio::error_code ec;
-      const protocol_type protocol = peer_endpoint.protocol();
-      this->get_service().open(this->get_implementation(), protocol, ec);
-      if (ec)
-      {
-        async_completion<ConnectHandler,
-          void (asio::error_code)> init(handler);
-
-        asio::post(this->get_executor(),
-            asio::detail::bind_handler(
-              ASIO_MOVE_CAST(ASIO_HANDLER_TYPE(
-                ConnectHandler, void (asio::error_code)))(
-                  init.completion_handler), ec));
-
-        return init.result.get();
-      }
-    }
-
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-    return this->get_service().async_connect(this->get_implementation(),
-        peer_endpoint, ASIO_MOVE_CAST(ConnectHandler)(handler));
-#else // defined(ASIO_ENABLE_OLD_SERVICES)
-    async_completion<ConnectHandler,
-      void (asio::error_code)> init(handler);
-
-    this->get_service().async_connect(
-        this->get_implementation(), peer_endpoint, init.completion_handler);
-
-    return init.result.get();
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-  }
-
-  /// Set an option on the socket.
-  /**
-   * This function is used to set an option on the socket.
-   *
-   * @param option The new option value to be set on the socket.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @sa SettableSocketOption @n
-   * asio::socket_base::broadcast @n
-   * asio::socket_base::do_not_route @n
-   * asio::socket_base::keep_alive @n
-   * asio::socket_base::linger @n
-   * asio::socket_base::receive_buffer_size @n
-   * asio::socket_base::receive_low_watermark @n
-   * asio::socket_base::reuse_address @n
-   * asio::socket_base::send_buffer_size @n
-   * asio::socket_base::send_low_watermark @n
-   * asio::ip::multicast::join_group @n
-   * asio::ip::multicast::leave_group @n
-   * asio::ip::multicast::enable_loopback @n
-   * asio::ip::multicast::outbound_interface @n
-   * asio::ip::multicast::hops @n
-   * asio::ip::tcp::no_delay
-   *
-   * @par Example
-   * Setting the IPPROTO_TCP/TCP_NODELAY option:
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::ip::tcp::no_delay option(true);
-   * socket.set_option(option);
-   * @endcode
-   */
-  template <typename SettableSocketOption>
-  void set_option(const SettableSocketOption& option)
-  {
-    asio::error_code ec;
-    this->get_service().set_option(this->get_implementation(), option, ec);
-    asio::detail::throw_error(ec, "set_option");
-  }
-
-  /// Set an option on the socket.
-  /**
-   * This function is used to set an option on the socket.
-   *
-   * @param option The new option value to be set on the socket.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @sa SettableSocketOption @n
-   * asio::socket_base::broadcast @n
-   * asio::socket_base::do_not_route @n
-   * asio::socket_base::keep_alive @n
-   * asio::socket_base::linger @n
-   * asio::socket_base::receive_buffer_size @n
-   * asio::socket_base::receive_low_watermark @n
-   * asio::socket_base::reuse_address @n
-   * asio::socket_base::send_buffer_size @n
-   * asio::socket_base::send_low_watermark @n
-   * asio::ip::multicast::join_group @n
-   * asio::ip::multicast::leave_group @n
-   * asio::ip::multicast::enable_loopback @n
-   * asio::ip::multicast::outbound_interface @n
-   * asio::ip::multicast::hops @n
-   * asio::ip::tcp::no_delay
-   *
-   * @par Example
-   * Setting the IPPROTO_TCP/TCP_NODELAY option:
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::ip::tcp::no_delay option(true);
-   * asio::error_code ec;
-   * socket.set_option(option, ec);
-   * if (ec)
-   * {
-   *   // An error occurred.
-   * }
-   * @endcode
-   */
-  template <typename SettableSocketOption>
-  ASIO_SYNC_OP_VOID set_option(const SettableSocketOption& option,
-      asio::error_code& ec)
-  {
-    this->get_service().set_option(this->get_implementation(), option, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Get an option from the socket.
-  /**
-   * This function is used to get the current value of an option on the socket.
-   *
-   * @param option The option value to be obtained from the socket.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @sa GettableSocketOption @n
-   * asio::socket_base::broadcast @n
-   * asio::socket_base::do_not_route @n
-   * asio::socket_base::keep_alive @n
-   * asio::socket_base::linger @n
-   * asio::socket_base::receive_buffer_size @n
-   * asio::socket_base::receive_low_watermark @n
-   * asio::socket_base::reuse_address @n
-   * asio::socket_base::send_buffer_size @n
-   * asio::socket_base::send_low_watermark @n
-   * asio::ip::multicast::join_group @n
-   * asio::ip::multicast::leave_group @n
-   * asio::ip::multicast::enable_loopback @n
-   * asio::ip::multicast::outbound_interface @n
-   * asio::ip::multicast::hops @n
-   * asio::ip::tcp::no_delay
-   *
-   * @par Example
-   * Getting the value of the SOL_SOCKET/SO_KEEPALIVE option:
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::ip::tcp::socket::keep_alive option;
-   * socket.get_option(option);
-   * bool is_set = option.value();
-   * @endcode
-   */
-  template <typename GettableSocketOption>
-  void get_option(GettableSocketOption& option) const
-  {
-    asio::error_code ec;
-    this->get_service().get_option(this->get_implementation(), option, ec);
-    asio::detail::throw_error(ec, "get_option");
-  }
-
-  /// Get an option from the socket.
-  /**
-   * This function is used to get the current value of an option on the socket.
-   *
-   * @param option The option value to be obtained from the socket.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @sa GettableSocketOption @n
-   * asio::socket_base::broadcast @n
-   * asio::socket_base::do_not_route @n
-   * asio::socket_base::keep_alive @n
-   * asio::socket_base::linger @n
-   * asio::socket_base::receive_buffer_size @n
-   * asio::socket_base::receive_low_watermark @n
-   * asio::socket_base::reuse_address @n
-   * asio::socket_base::send_buffer_size @n
-   * asio::socket_base::send_low_watermark @n
-   * asio::ip::multicast::join_group @n
-   * asio::ip::multicast::leave_group @n
-   * asio::ip::multicast::enable_loopback @n
-   * asio::ip::multicast::outbound_interface @n
-   * asio::ip::multicast::hops @n
-   * asio::ip::tcp::no_delay
-   *
-   * @par Example
-   * Getting the value of the SOL_SOCKET/SO_KEEPALIVE option:
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::ip::tcp::socket::keep_alive option;
-   * asio::error_code ec;
-   * socket.get_option(option, ec);
-   * if (ec)
-   * {
-   *   // An error occurred.
-   * }
-   * bool is_set = option.value();
-   * @endcode
-   */
-  template <typename GettableSocketOption>
-  ASIO_SYNC_OP_VOID get_option(GettableSocketOption& option,
-      asio::error_code& ec) const
-  {
-    this->get_service().get_option(this->get_implementation(), option, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Perform an IO control command on the socket.
-  /**
-   * This function is used to execute an IO control command on the socket.
-   *
-   * @param command The IO control command to be performed on the socket.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @sa IoControlCommand @n
-   * asio::socket_base::bytes_readable @n
-   * asio::socket_base::non_blocking_io
-   *
-   * @par Example
-   * Getting the number of bytes ready to read:
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::ip::tcp::socket::bytes_readable command;
-   * socket.io_control(command);
-   * std::size_t bytes_readable = command.get();
-   * @endcode
-   */
-  template <typename IoControlCommand>
-  void io_control(IoControlCommand& command)
-  {
-    asio::error_code ec;
-    this->get_service().io_control(this->get_implementation(), command, ec);
-    asio::detail::throw_error(ec, "io_control");
-  }
-
-  /// Perform an IO control command on the socket.
-  /**
-   * This function is used to execute an IO control command on the socket.
-   *
-   * @param command The IO control command to be performed on the socket.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @sa IoControlCommand @n
-   * asio::socket_base::bytes_readable @n
-   * asio::socket_base::non_blocking_io
-   *
-   * @par Example
-   * Getting the number of bytes ready to read:
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::ip::tcp::socket::bytes_readable command;
-   * asio::error_code ec;
-   * socket.io_control(command, ec);
-   * if (ec)
-   * {
-   *   // An error occurred.
-   * }
-   * std::size_t bytes_readable = command.get();
-   * @endcode
-   */
-  template <typename IoControlCommand>
-  ASIO_SYNC_OP_VOID io_control(IoControlCommand& command,
-      asio::error_code& ec)
-  {
-    this->get_service().io_control(this->get_implementation(), command, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Gets the non-blocking mode of the socket.
-  /**
-   * @returns @c true if the socket's synchronous operations will fail with
-   * asio::error::would_block if they are unable to perform the requested
-   * operation immediately. If @c false, synchronous operations will block
-   * until complete.
-   *
-   * @note The non-blocking mode has no effect on the behaviour of asynchronous
-   * operations. Asynchronous operations will never fail with the error
-   * asio::error::would_block.
-   */
-  bool non_blocking() const
-  {
-    return this->get_service().non_blocking(this->get_implementation());
-  }
-
-  /// Sets the non-blocking mode of the socket.
-  /**
-   * @param mode If @c true, the socket's synchronous operations will fail with
-   * asio::error::would_block if they are unable to perform the requested
-   * operation immediately. If @c false, synchronous operations will block
-   * until complete.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @note The non-blocking mode has no effect on the behaviour of asynchronous
-   * operations. Asynchronous operations will never fail with the error
-   * asio::error::would_block.
-   */
-  void non_blocking(bool mode)
-  {
-    asio::error_code ec;
-    this->get_service().non_blocking(this->get_implementation(), mode, ec);
-    asio::detail::throw_error(ec, "non_blocking");
-  }
-
-  /// Sets the non-blocking mode of the socket.
-  /**
-   * @param mode If @c true, the socket's synchronous operations will fail with
-   * asio::error::would_block if they are unable to perform the requested
-   * operation immediately. If @c false, synchronous operations will block
-   * until complete.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @note The non-blocking mode has no effect on the behaviour of asynchronous
-   * operations. Asynchronous operations will never fail with the error
-   * asio::error::would_block.
-   */
-  ASIO_SYNC_OP_VOID non_blocking(
-      bool mode, asio::error_code& ec)
-  {
-    this->get_service().non_blocking(this->get_implementation(), mode, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Gets the non-blocking mode of the native socket implementation.
-  /**
-   * This function is used to retrieve the non-blocking mode of the underlying
-   * native socket. This mode has no effect on the behaviour of the socket
-   * object's synchronous operations.
-   *
-   * @returns @c true if the underlying socket is in non-blocking mode and
-   * direct system calls may fail with asio::error::would_block (or the
-   * equivalent system error).
-   *
-   * @note The current non-blocking mode is cached by the socket object.
-   * Consequently, the return value may be incorrect if the non-blocking mode
-   * was set directly on the native socket.
-   *
-   * @par Example
-   * This function is intended to allow the encapsulation of arbitrary
-   * non-blocking system calls as asynchronous operations, in a way that is
-   * transparent to the user of the socket object. The following example
-   * illustrates how Linux's @c sendfile system call might be encapsulated:
-   * @code template <typename Handler>
-   * struct sendfile_op
-   * {
-   *   tcp::socket& sock_;
-   *   int fd_;
-   *   Handler handler_;
-   *   off_t offset_;
-   *   std::size_t total_bytes_transferred_;
-   *
-   *   // Function call operator meeting WriteHandler requirements.
-   *   // Used as the handler for the async_write_some operation.
-   *   void operator()(asio::error_code ec, std::size_t)
-   *   {
-   *     // Put the underlying socket into non-blocking mode.
-   *     if (!ec)
-   *       if (!sock_.native_non_blocking())
-   *         sock_.native_non_blocking(true, ec);
-   *
-   *     if (!ec)
-   *     {
-   *       for (;;)
-   *       {
-   *         // Try the system call.
-   *         errno = 0;
-   *         int n = ::sendfile(sock_.native_handle(), fd_, &offset_, 65536);
-   *         ec = asio::error_code(n < 0 ? errno : 0,
-   *             asio::error::get_system_category());
-   *         total_bytes_transferred_ += ec ? 0 : n;
-   *
-   *         // Retry operation immediately if interrupted by signal.
-   *         if (ec == asio::error::interrupted)
-   *           continue;
-   *
-   *         // Check if we need to run the operation again.
-   *         if (ec == asio::error::would_block
-   *             || ec == asio::error::try_again)
-   *         {
-   *           // We have to wait for the socket to become ready again.
-   *           sock_.async_wait(tcp::socket::wait_write, *this);
-   *           return;
-   *         }
-   *
-   *         if (ec || n == 0)
-   *         {
-   *           // An error occurred, or we have reached the end of the file.
-   *           // Either way we must exit the loop so we can call the handler.
-   *           break;
-   *         }
-   *
-   *         // Loop around to try calling sendfile again.
-   *       }
-   *     }
-   *
-   *     // Pass result back to user's handler.
-   *     handler_(ec, total_bytes_transferred_);
-   *   }
-   * };
-   *
-   * template <typename Handler>
-   * void async_sendfile(tcp::socket& sock, int fd, Handler h)
-   * {
-   *   sendfile_op<Handler> op = { sock, fd, h, 0, 0 };
-   *   sock.async_wait(tcp::socket::wait_write, op);
-   * } @endcode
-   */
-  bool native_non_blocking() const
-  {
-    return this->get_service().native_non_blocking(this->get_implementation());
-  }
-
-  /// Sets the non-blocking mode of the native socket implementation.
-  /**
-   * This function is used to modify the non-blocking mode of the underlying
-   * native socket. It has no effect on the behaviour of the socket object's
-   * synchronous operations.
-   *
-   * @param mode If @c true, the underlying socket is put into non-blocking
-   * mode and direct system calls may fail with asio::error::would_block
-   * (or the equivalent system error).
-   *
-   * @throws asio::system_error Thrown on failure. If the @c mode is
-   * @c false, but the current value of @c non_blocking() is @c true, this
-   * function fails with asio::error::invalid_argument, as the
-   * combination does not make sense.
-   *
-   * @par Example
-   * This function is intended to allow the encapsulation of arbitrary
-   * non-blocking system calls as asynchronous operations, in a way that is
-   * transparent to the user of the socket object. The following example
-   * illustrates how Linux's @c sendfile system call might be encapsulated:
-   * @code template <typename Handler>
-   * struct sendfile_op
-   * {
-   *   tcp::socket& sock_;
-   *   int fd_;
-   *   Handler handler_;
-   *   off_t offset_;
-   *   std::size_t total_bytes_transferred_;
-   *
-   *   // Function call operator meeting WriteHandler requirements.
-   *   // Used as the handler for the async_write_some operation.
-   *   void operator()(asio::error_code ec, std::size_t)
-   *   {
-   *     // Put the underlying socket into non-blocking mode.
-   *     if (!ec)
-   *       if (!sock_.native_non_blocking())
-   *         sock_.native_non_blocking(true, ec);
-   *
-   *     if (!ec)
-   *     {
-   *       for (;;)
-   *       {
-   *         // Try the system call.
-   *         errno = 0;
-   *         int n = ::sendfile(sock_.native_handle(), fd_, &offset_, 65536);
-   *         ec = asio::error_code(n < 0 ? errno : 0,
-   *             asio::error::get_system_category());
-   *         total_bytes_transferred_ += ec ? 0 : n;
-   *
-   *         // Retry operation immediately if interrupted by signal.
-   *         if (ec == asio::error::interrupted)
-   *           continue;
-   *
-   *         // Check if we need to run the operation again.
-   *         if (ec == asio::error::would_block
-   *             || ec == asio::error::try_again)
-   *         {
-   *           // We have to wait for the socket to become ready again.
-   *           sock_.async_wait(tcp::socket::wait_write, *this);
-   *           return;
-   *         }
-   *
-   *         if (ec || n == 0)
-   *         {
-   *           // An error occurred, or we have reached the end of the file.
-   *           // Either way we must exit the loop so we can call the handler.
-   *           break;
-   *         }
-   *
-   *         // Loop around to try calling sendfile again.
-   *       }
-   *     }
-   *
-   *     // Pass result back to user's handler.
-   *     handler_(ec, total_bytes_transferred_);
-   *   }
-   * };
-   *
-   * template <typename Handler>
-   * void async_sendfile(tcp::socket& sock, int fd, Handler h)
-   * {
-   *   sendfile_op<Handler> op = { sock, fd, h, 0, 0 };
-   *   sock.async_wait(tcp::socket::wait_write, op);
-   * } @endcode
-   */
-  void native_non_blocking(bool mode)
-  {
-    asio::error_code ec;
-    this->get_service().native_non_blocking(
-        this->get_implementation(), mode, ec);
-    asio::detail::throw_error(ec, "native_non_blocking");
-  }
-
-  /// Sets the non-blocking mode of the native socket implementation.
-  /**
-   * This function is used to modify the non-blocking mode of the underlying
-   * native socket. It has no effect on the behaviour of the socket object's
-   * synchronous operations.
-   *
-   * @param mode If @c true, the underlying socket is put into non-blocking
-   * mode and direct system calls may fail with asio::error::would_block
-   * (or the equivalent system error).
-   *
-   * @param ec Set to indicate what error occurred, if any. If the @c mode is
-   * @c false, but the current value of @c non_blocking() is @c true, this
-   * function fails with asio::error::invalid_argument, as the
-   * combination does not make sense.
-   *
-   * @par Example
-   * This function is intended to allow the encapsulation of arbitrary
-   * non-blocking system calls as asynchronous operations, in a way that is
-   * transparent to the user of the socket object. The following example
-   * illustrates how Linux's @c sendfile system call might be encapsulated:
-   * @code template <typename Handler>
-   * struct sendfile_op
-   * {
-   *   tcp::socket& sock_;
-   *   int fd_;
-   *   Handler handler_;
-   *   off_t offset_;
-   *   std::size_t total_bytes_transferred_;
-   *
-   *   // Function call operator meeting WriteHandler requirements.
-   *   // Used as the handler for the async_write_some operation.
-   *   void operator()(asio::error_code ec, std::size_t)
-   *   {
-   *     // Put the underlying socket into non-blocking mode.
-   *     if (!ec)
-   *       if (!sock_.native_non_blocking())
-   *         sock_.native_non_blocking(true, ec);
-   *
-   *     if (!ec)
-   *     {
-   *       for (;;)
-   *       {
-   *         // Try the system call.
-   *         errno = 0;
-   *         int n = ::sendfile(sock_.native_handle(), fd_, &offset_, 65536);
-   *         ec = asio::error_code(n < 0 ? errno : 0,
-   *             asio::error::get_system_category());
-   *         total_bytes_transferred_ += ec ? 0 : n;
-   *
-   *         // Retry operation immediately if interrupted by signal.
-   *         if (ec == asio::error::interrupted)
-   *           continue;
-   *
-   *         // Check if we need to run the operation again.
-   *         if (ec == asio::error::would_block
-   *             || ec == asio::error::try_again)
-   *         {
-   *           // We have to wait for the socket to become ready again.
-   *           sock_.async_wait(tcp::socket::wait_write, *this);
-   *           return;
-   *         }
-   *
-   *         if (ec || n == 0)
-   *         {
-   *           // An error occurred, or we have reached the end of the file.
-   *           // Either way we must exit the loop so we can call the handler.
-   *           break;
-   *         }
-   *
-   *         // Loop around to try calling sendfile again.
-   *       }
-   *     }
-   *
-   *     // Pass result back to user's handler.
-   *     handler_(ec, total_bytes_transferred_);
-   *   }
-   * };
-   *
-   * template <typename Handler>
-   * void async_sendfile(tcp::socket& sock, int fd, Handler h)
-   * {
-   *   sendfile_op<Handler> op = { sock, fd, h, 0, 0 };
-   *   sock.async_wait(tcp::socket::wait_write, op);
-   * } @endcode
-   */
-  ASIO_SYNC_OP_VOID native_non_blocking(
-      bool mode, asio::error_code& ec)
-  {
-    this->get_service().native_non_blocking(
-        this->get_implementation(), mode, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Get the local endpoint of the socket.
-  /**
-   * This function is used to obtain the locally bound endpoint of the socket.
-   *
-   * @returns An object that represents the local endpoint of the socket.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::ip::tcp::endpoint endpoint = socket.local_endpoint();
-   * @endcode
-   */
-  endpoint_type local_endpoint() const
-  {
-    asio::error_code ec;
-    endpoint_type ep = this->get_service().local_endpoint(
-        this->get_implementation(), ec);
-    asio::detail::throw_error(ec, "local_endpoint");
-    return ep;
-  }
-
-  /// Get the local endpoint of the socket.
-  /**
-   * This function is used to obtain the locally bound endpoint of the socket.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @returns An object that represents the local endpoint of the socket.
-   * Returns a default-constructed endpoint object if an error occurred.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::error_code ec;
-   * asio::ip::tcp::endpoint endpoint = socket.local_endpoint(ec);
-   * if (ec)
-   * {
-   *   // An error occurred.
-   * }
-   * @endcode
-   */
-  endpoint_type local_endpoint(asio::error_code& ec) const
-  {
-    return this->get_service().local_endpoint(this->get_implementation(), ec);
-  }
-
-  /// Get the remote endpoint of the socket.
-  /**
-   * This function is used to obtain the remote endpoint of the socket.
-   *
-   * @returns An object that represents the remote endpoint of the socket.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::ip::tcp::endpoint endpoint = socket.remote_endpoint();
-   * @endcode
-   */
-  endpoint_type remote_endpoint() const
-  {
-    asio::error_code ec;
-    endpoint_type ep = this->get_service().remote_endpoint(
-        this->get_implementation(), ec);
-    asio::detail::throw_error(ec, "remote_endpoint");
-    return ep;
-  }
-
-  /// Get the remote endpoint of the socket.
-  /**
-   * This function is used to obtain the remote endpoint of the socket.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @returns An object that represents the remote endpoint of the socket.
-   * Returns a default-constructed endpoint object if an error occurred.
-   *
-   * @par Example
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::error_code ec;
-   * asio::ip::tcp::endpoint endpoint = socket.remote_endpoint(ec);
-   * if (ec)
-   * {
-   *   // An error occurred.
-   * }
-   * @endcode
-   */
-  endpoint_type remote_endpoint(asio::error_code& ec) const
-  {
-    return this->get_service().remote_endpoint(this->get_implementation(), ec);
-  }
-
-  /// Disable sends or receives on the socket.
-  /**
-   * This function is used to disable send operations, receive operations, or
-   * both.
-   *
-   * @param what Determines what types of operation will no longer be allowed.
-   *
-   * @throws asio::system_error Thrown on failure.
-   *
-   * @par Example
-   * Shutting down the send side of the socket:
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * socket.shutdown(asio::ip::tcp::socket::shutdown_send);
-   * @endcode
-   */
-  void shutdown(shutdown_type what)
-  {
-    asio::error_code ec;
-    this->get_service().shutdown(this->get_implementation(), what, ec);
-    asio::detail::throw_error(ec, "shutdown");
-  }
-
-  /// Disable sends or receives on the socket.
-  /**
-   * This function is used to disable send operations, receive operations, or
-   * both.
-   *
-   * @param what Determines what types of operation will no longer be allowed.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @par Example
-   * Shutting down the send side of the socket:
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::error_code ec;
-   * socket.shutdown(asio::ip::tcp::socket::shutdown_send, ec);
-   * if (ec)
-   * {
-   *   // An error occurred.
-   * }
-   * @endcode
-   */
-  ASIO_SYNC_OP_VOID shutdown(shutdown_type what,
-      asio::error_code& ec)
-  {
-    this->get_service().shutdown(this->get_implementation(), what, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Wait for the socket to become ready to read, ready to write, or to have
-  /// pending error conditions.
-  /**
-   * This function is used to perform a blocking wait for a socket to enter
-   * a ready to read, write or error condition state.
-   *
-   * @param w Specifies the desired socket state.
-   *
-   * @par Example
-   * Waiting for a socket to become readable.
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * socket.wait(asio::ip::tcp::socket::wait_read);
-   * @endcode
-   */
-  void wait(wait_type w)
-  {
-    asio::error_code ec;
-    this->get_service().wait(this->get_implementation(), w, ec);
-    asio::detail::throw_error(ec, "wait");
-  }
-
-  /// Wait for the socket to become ready to read, ready to write, or to have
-  /// pending error conditions.
-  /**
-   * This function is used to perform a blocking wait for a socket to enter
-   * a ready to read, write or error condition state.
-   *
-   * @param w Specifies the desired socket state.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @par Example
-   * Waiting for a socket to become readable.
-   * @code
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * asio::error_code ec;
-   * socket.wait(asio::ip::tcp::socket::wait_read, ec);
-   * @endcode
-   */
-  ASIO_SYNC_OP_VOID wait(wait_type w, asio::error_code& ec)
-  {
-    this->get_service().wait(this->get_implementation(), w, ec);
-    ASIO_SYNC_OP_VOID_RETURN(ec);
-  }
-
-  /// Asynchronously wait for the socket to become ready to read, ready to
-  /// write, or to have pending error conditions.
-  /**
-   * This function is used to perform an asynchronous wait for a socket to enter
-   * a ready to read, write or error condition state.
-   *
-   * @param w Specifies the desired socket state.
-   *
-   * @param handler The handler to be called when the wait 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
-   * ); @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
-   * @code
-   * void wait_handler(const asio::error_code& error)
-   * {
-   *   if (!error)
-   *   {
-   *     // Wait succeeded.
-   *   }
-   * }
-   *
-   * ...
-   *
-   * asio::ip::tcp::socket socket(io_context);
-   * ...
-   * socket.async_wait(asio::ip::tcp::socket::wait_read, wait_handler);
-   * @endcode
-   */
-  template <typename WaitHandler>
-  ASIO_INITFN_RESULT_TYPE(WaitHandler,
-      void (asio::error_code))
-  async_wait(wait_type w, ASIO_MOVE_ARG(WaitHandler) handler)
-  {
-    // If you get an error on the following line it means that your handler does
-    // not meet the documented type requirements for a WaitHandler.
-    ASIO_WAIT_HANDLER_CHECK(WaitHandler, handler) type_check;
-
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-    return this->get_service().async_wait(this->get_implementation(),
-        w, ASIO_MOVE_CAST(WaitHandler)(handler));
-#else // defined(ASIO_ENABLE_OLD_SERVICES)
-    async_completion<WaitHandler,
-      void (asio::error_code)> init(handler);
-
-    this->get_service().async_wait(this->get_implementation(),
-        w, init.completion_handler);
-
-    return init.result.get();
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-  }
-
-protected:
-  /// Protected destructor to prevent deletion through this type.
-  /**
-   * This function destroys the socket, cancelling any outstanding asynchronous
-   * operations associated with the socket as if by calling @c cancel.
-   */
-  ~basic_socket()
-  {
-  }
-
-private:
-  // Disallow copying and assignment.
-  basic_socket(const basic_socket&) ASIO_DELETED;
-  basic_socket& operator=(const basic_socket&) ASIO_DELETED;
-};
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#if !defined(ASIO_ENABLE_OLD_SERVICES)
-# undef ASIO_SVC_T
-#endif // !defined(ASIO_ENABLE_OLD_SERVICES)
-
-#endif // ASIO_BASIC_SOCKET_HPP