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 //
 // posix/basic_descriptor.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
 
 #ifndef BOOST_ASIO_POSIX_BASIC_DESCRIPTOR_HPP
 #define BOOST_ASIO_POSIX_BASIC_DESCRIPTOR_HPP
 
 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
 # pragma once
 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
 
 #include <boost/asio/detail/config.hpp>
 
 #if defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR) \
   || defined(GENERATING_DOCUMENTATION)
 
 #include <utility>
 #include <boost/asio/any_io_executor.hpp>
 #include <boost/asio/async_result.hpp>
 #include <boost/asio/detail/handler_type_requirements.hpp>
 #include <boost/asio/detail/io_object_impl.hpp>
 #include <boost/asio/detail/non_const_lvalue.hpp>
 #include <boost/asio/detail/throw_error.hpp>
 #include <boost/asio/error.hpp>
 #include <boost/asio/execution_context.hpp>
 #include <boost/asio/posix/descriptor_base.hpp>
 
 #if defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
 # include <boost/asio/detail/io_uring_descriptor_service.hpp>
 #else // defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
 # include <boost/asio/detail/reactive_descriptor_service.hpp>
 #endif // defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
 
 #include <boost/asio/detail/push_options.hpp>
 
 namespace boost {
 namespace asio {
 namespace posix {
 
 /// Provides POSIX descriptor functionality.
 /**
  * The posix::basic_descriptor class template provides the ability to wrap a
  * POSIX descriptor.
  *
  * @par Thread Safety
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
  */
 template <typename Executor = any_io_executor>
 class basic_descriptor
   : public descriptor_base
 {
 private:
   class initiate_async_wait;
 
 public:
   /// The type of the executor associated with the object.
   typedef Executor executor_type;
 
   /// Rebinds the descriptor type to another executor.
   template <typename Executor1>
   struct rebind_executor
   {
     /// The descriptor type when rebound to the specified executor.
     typedef basic_descriptor<Executor1> other;
   };
 
   /// The native representation of a descriptor.
 #if defined(GENERATING_DOCUMENTATION)
   typedef implementation_defined native_handle_type;
 #elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
   typedef detail::io_uring_descriptor_service::native_handle_type
     native_handle_type;
 #else // defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
   typedef detail::reactive_descriptor_service::native_handle_type
     native_handle_type;
 #endif // defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
 
   /// A descriptor is always the lowest layer.
   typedef basic_descriptor lowest_layer_type;
 
   /// Construct a descriptor without opening it.
   /**
    * This constructor creates a descriptor without opening it.
    *
    * @param ex The I/O executor that the descriptor will use, by default, to
    * dispatch handlers for any asynchronous operations performed on the
    * descriptor.
    */
   explicit basic_descriptor(const executor_type& ex)
     : impl_(0, ex)
   {
   }
 
   /// Construct a descriptor without opening it.
   /**
    * This constructor creates a descriptor without opening it.
    *
    * @param context An execution context which provides the I/O executor that
    * the descriptor will use, by default, to dispatch handlers for any
    * asynchronous operations performed on the descriptor.
    */
   template <typename ExecutionContext>
   explicit basic_descriptor(ExecutionContext& context,
       constraint_t<
         is_convertible<ExecutionContext&, execution_context&>::value,
         defaulted_constraint
       > = defaulted_constraint())
     : impl_(0, 0, context)
   {
   }
 
   /// Construct a descriptor on an existing native descriptor.
   /**
    * This constructor creates a descriptor object to hold an existing native
    * descriptor.
    *
    * @param ex The I/O executor that the descriptor will use, by default, to
    * dispatch handlers for any asynchronous operations performed on the
    * descriptor.
    *
    * @param native_descriptor A native descriptor.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   basic_descriptor(const executor_type& ex,
       const native_handle_type& native_descriptor)
     : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(),
         native_descriptor, ec);
     boost::asio::detail::throw_error(ec, "assign");
   }
 
   /// Construct a descriptor on an existing native descriptor.
   /**
    * This constructor creates a descriptor object to hold an existing native
    * descriptor.
    *
    * @param context An execution context which provides the I/O executor that
    * the descriptor will use, by default, to dispatch handlers for any
    * asynchronous operations performed on the descriptor.
    *
    * @param native_descriptor A native descriptor.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   template <typename ExecutionContext>
   basic_descriptor(ExecutionContext& context,
       const native_handle_type& native_descriptor,
       constraint_t<
         is_convertible<ExecutionContext&, execution_context&>::value
       > = 0)
     : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(),
         native_descriptor, ec);
     boost::asio::detail::throw_error(ec, "assign");
   }
 
   /// Move-construct a descriptor from another.
   /**
    * This constructor moves a descriptor from one object to another.
    *
    * @param other The other descriptor 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_descriptor(const executor_type&)
    * constructor.
    */
   basic_descriptor(basic_descriptor&& other) noexcept
     : impl_(std::move(other.impl_))
   {
   }
 
   /// Move-assign a descriptor from another.
   /**
    * This assignment operator moves a descriptor from one object to another.
    *
    * @param other The other descriptor 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_descriptor(const executor_type&)
    * constructor.
    */
   basic_descriptor& operator=(basic_descriptor&& other)
   {
     impl_ = std::move(other.impl_);
     return *this;
   }
 
   // All descriptors have access to each other's implementations.
   template <typename Executor1>
   friend class basic_descriptor;
 
   /// Move-construct a basic_descriptor from a descriptor of another executor
   /// type.
   /**
    * This constructor moves a descriptor from one object to another.
    *
    * @param other The other basic_descriptor 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_descriptor(const executor_type&)
    * constructor.
    */
   template <typename Executor1>
   basic_descriptor(basic_descriptor<Executor1>&& other,
       constraint_t<
         is_convertible<Executor1, Executor>::value,
         defaulted_constraint
       > = defaulted_constraint())
     : impl_(std::move(other.impl_))
   {
   }
 
   /// Move-assign a basic_descriptor from a descriptor of another executor type.
   /**
    * This assignment operator moves a descriptor from one object to another.
    *
    * @param other The other basic_descriptor 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_descriptor(const executor_type&)
    * constructor.
    */
   template <typename Executor1>
   constraint_t<
     is_convertible<Executor1, Executor>::value,
     basic_descriptor&
   > operator=(basic_descriptor<Executor1> && other)
   {
     basic_descriptor tmp(std::move(other));
     impl_ = std::move(tmp.impl_);
     return *this;
   }
 
   /// Get the executor associated with the object.
   const executor_type& get_executor() noexcept
   {
     return impl_.get_executor();
   }
 
   /// Get a reference to the lowest layer.
   /**
    * This function returns a reference to the lowest layer in a stack of
    * layers. Since a descriptor 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 descriptor 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;
   }
 
   /// Assign an existing native descriptor to the descriptor.
   /*
    * This function opens the descriptor to hold an existing native descriptor.
    *
    * @param native_descriptor A native descriptor.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   void assign(const native_handle_type& native_descriptor)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(),
         native_descriptor, ec);
     boost::asio::detail::throw_error(ec, "assign");
   }
 
   /// Assign an existing native descriptor to the descriptor.
   /*
    * This function opens the descriptor to hold an existing native descriptor.
    *
    * @param native_descriptor A native descriptor.
    *
    * @param ec Set to indicate what error occurred, if any.
    */
   BOOST_ASIO_SYNC_OP_VOID assign(const native_handle_type& native_descriptor,
       boost::system::error_code& ec)
   {
     impl_.get_service().assign(
         impl_.get_implementation(), native_descriptor, ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Determine whether the descriptor is open.
   bool is_open() const
   {
     return impl_.get_service().is_open(impl_.get_implementation());
   }
 
   /// Close the descriptor.
   /**
    * This function is used to close the descriptor. Any asynchronous read or
    * write operations will be cancelled immediately, and will complete with the
    * boost::asio::error::operation_aborted error.
    *
    * @throws boost::system::system_error Thrown on failure. Note that, even if
    * the function indicates an error, the underlying descriptor is closed.
    */
   void close()
   {
     boost::system::error_code ec;
     impl_.get_service().close(impl_.get_implementation(), ec);
     boost::asio::detail::throw_error(ec, "close");
   }
 
   /// Close the descriptor.
   /**
    * This function is used to close the descriptor. Any asynchronous read or
    * write operations will be cancelled immediately, and will complete with the
    * boost::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.
    */
   BOOST_ASIO_SYNC_OP_VOID close(boost::system::error_code& ec)
   {
     impl_.get_service().close(impl_.get_implementation(), ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Get the native descriptor representation.
   /**
    * This function may be used to obtain the underlying representation of the
    * descriptor. This is intended to allow access to native descriptor
    * functionality that is not otherwise provided.
    */
   native_handle_type native_handle()
   {
     return impl_.get_service().native_handle(impl_.get_implementation());
   }
 
   /// Release ownership of the native descriptor implementation.
   /**
    * This function may be used to obtain the underlying representation of the
    * descriptor. After calling this function, @c is_open() returns false. The
    * caller is responsible for closing the descriptor.
    *
    * All outstanding asynchronous read or write operations will finish
    * immediately, and the handlers for cancelled operations will be passed the
    * boost::asio::error::operation_aborted error.
    */
   native_handle_type release()
   {
     return impl_.get_service().release(impl_.get_implementation());
   }
 
   /// Cancel all asynchronous operations associated with the descriptor.
   /**
    * This function causes all outstanding asynchronous read or write operations
    * to finish immediately, and the handlers for cancelled operations will be
    * passed the boost::asio::error::operation_aborted error.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   void cancel()
   {
     boost::system::error_code ec;
     impl_.get_service().cancel(impl_.get_implementation(), ec);
     boost::asio::detail::throw_error(ec, "cancel");
   }
 
   /// Cancel all asynchronous operations associated with the descriptor.
   /**
    * This function causes all outstanding asynchronous read or write operations
    * to finish immediately, and the handlers for cancelled operations will be
    * passed the boost::asio::error::operation_aborted error.
    *
    * @param ec Set to indicate what error occurred, if any.
    */
   BOOST_ASIO_SYNC_OP_VOID cancel(boost::system::error_code& ec)
   {
     impl_.get_service().cancel(impl_.get_implementation(), ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Perform an IO control command on the descriptor.
   /**
    * This function is used to execute an IO control command on the descriptor.
    *
    * @param command The IO control command to be performed on the descriptor.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @sa IoControlCommand @n
    * boost::asio::posix::descriptor_base::bytes_readable @n
    * boost::asio::posix::descriptor_base::non_blocking_io
    *
    * @par Example
    * Getting the number of bytes ready to read:
    * @code
    * boost::asio::posix::stream_descriptor descriptor(my_context);
    * ...
    * boost::asio::posix::stream_descriptor::bytes_readable command;
    * descriptor.io_control(command);
    * std::size_t bytes_readable = command.get();
    * @endcode
    */
   template <typename IoControlCommand>
   void io_control(IoControlCommand& command)
   {
     boost::system::error_code ec;
     impl_.get_service().io_control(impl_.get_implementation(), command, ec);
     boost::asio::detail::throw_error(ec, "io_control");
   }
 
   /// Perform an IO control command on the descriptor.
   /**
    * This function is used to execute an IO control command on the descriptor.
    *
    * @param command The IO control command to be performed on the descriptor.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @sa IoControlCommand @n
    * boost::asio::posix::descriptor_base::bytes_readable @n
    * boost::asio::posix::descriptor_base::non_blocking_io
    *
    * @par Example
    * Getting the number of bytes ready to read:
    * @code
    * boost::asio::posix::stream_descriptor descriptor(my_context);
    * ...
    * boost::asio::posix::stream_descriptor::bytes_readable command;
    * boost::system::error_code ec;
    * descriptor.io_control(command, ec);
    * if (ec)
    * {
    *   // An error occurred.
    * }
    * std::size_t bytes_readable = command.get();
    * @endcode
    */
   template <typename IoControlCommand>
   BOOST_ASIO_SYNC_OP_VOID io_control(IoControlCommand& command,
       boost::system::error_code& ec)
   {
     impl_.get_service().io_control(impl_.get_implementation(), command, ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Gets the non-blocking mode of the descriptor.
   /**
    * @returns @c true if the descriptor's synchronous operations will fail with
    * boost::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
    * boost::asio::error::would_block.
    */
   bool non_blocking() const
   {
     return impl_.get_service().non_blocking(impl_.get_implementation());
   }
 
   /// Sets the non-blocking mode of the descriptor.
   /**
    * @param mode If @c true, the descriptor's synchronous operations will fail
    * with boost::asio::error::would_block if they are unable to perform the
    * requested operation immediately. If @c false, synchronous operations will
    * block until complete.
    *
    * @throws boost::system::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
    * boost::asio::error::would_block.
    */
   void non_blocking(bool mode)
   {
     boost::system::error_code ec;
     impl_.get_service().non_blocking(impl_.get_implementation(), mode, ec);
     boost::asio::detail::throw_error(ec, "non_blocking");
   }
 
   /// Sets the non-blocking mode of the descriptor.
   /**
    * @param mode If @c true, the descriptor's synchronous operations will fail
    * with boost::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
    * boost::asio::error::would_block.
    */
   BOOST_ASIO_SYNC_OP_VOID non_blocking(
       bool mode, boost::system::error_code& ec)
   {
     impl_.get_service().non_blocking(impl_.get_implementation(), mode, ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Gets the non-blocking mode of the native descriptor implementation.
   /**
    * This function is used to retrieve the non-blocking mode of the underlying
    * native descriptor. This mode has no effect on the behaviour of the
    * descriptor object's synchronous operations.
    *
    * @returns @c true if the underlying descriptor is in non-blocking mode and
    * direct system calls may fail with boost::asio::error::would_block (or the
    * equivalent system error).
    *
    * @note The current non-blocking mode is cached by the descriptor object.
    * Consequently, the return value may be incorrect if the non-blocking mode
    * was set directly on the native descriptor.
    */
   bool native_non_blocking() const
   {
     return impl_.get_service().native_non_blocking(
         impl_.get_implementation());
   }
 
   /// Sets the non-blocking mode of the native descriptor implementation.
   /**
    * This function is used to modify the non-blocking mode of the underlying
    * native descriptor. It has no effect on the behaviour of the descriptor
    * object's synchronous operations.
    *
    * @param mode If @c true, the underlying descriptor is put into non-blocking
    * mode and direct system calls may fail with boost::asio::error::would_block
    * (or the equivalent system error).
    *
    * @throws boost::system::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 boost::asio::error::invalid_argument, as the
    * combination does not make sense.
    */
   void native_non_blocking(bool mode)
   {
     boost::system::error_code ec;
     impl_.get_service().native_non_blocking(
         impl_.get_implementation(), mode, ec);
     boost::asio::detail::throw_error(ec, "native_non_blocking");
   }
 
   /// Sets the non-blocking mode of the native descriptor implementation.
   /**
    * This function is used to modify the non-blocking mode of the underlying
    * native descriptor. It has no effect on the behaviour of the descriptor
    * object's synchronous operations.
    *
    * @param mode If @c true, the underlying descriptor is put into non-blocking
    * mode and direct system calls may fail with boost::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 boost::asio::error::invalid_argument, as the
    * combination does not make sense.
    */
   BOOST_ASIO_SYNC_OP_VOID native_non_blocking(
       bool mode, boost::system::error_code& ec)
   {
     impl_.get_service().native_non_blocking(
         impl_.get_implementation(), mode, ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Wait for the descriptor 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 descriptor to enter
    * a ready to read, write or error condition state.
    *
    * @param w Specifies the desired descriptor state.
    *
    * @par Example
    * Waiting for a descriptor to become readable.
    * @code
    * boost::asio::posix::stream_descriptor descriptor(my_context);
    * ...
    * descriptor.wait(boost::asio::posix::stream_descriptor::wait_read);
    * @endcode
    */
   void wait(wait_type w)
   {
     boost::system::error_code ec;
     impl_.get_service().wait(impl_.get_implementation(), w, ec);
     boost::asio::detail::throw_error(ec, "wait");
   }
 
   /// Wait for the descriptor 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 descriptor to enter
    * a ready to read, write or error condition state.
    *
    * @param w Specifies the desired descriptor state.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @par Example
    * Waiting for a descriptor to become readable.
    * @code
    * boost::asio::posix::stream_descriptor descriptor(my_context);
    * ...
    * boost::system::error_code ec;
    * descriptor.wait(boost::asio::posix::stream_descriptor::wait_read, ec);
    * @endcode
    */
   BOOST_ASIO_SYNC_OP_VOID wait(wait_type w, boost::system::error_code& ec)
   {
     impl_.get_service().wait(impl_.get_implementation(), w, ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Asynchronously wait for the descriptor 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 descriptor to
    * enter a ready to read, write or error condition state. It is an initiating
    * function for an @ref asynchronous_operation, and always returns
    * immediately.
    *
    * @param w Specifies the desired descriptor state.
    *
    * @param token The @ref completion_token that will be used to produce a
    * completion handler, which will be called when the wait completes.
    * Potential completion tokens include @ref use_future, @ref use_awaitable,
    * @ref yield_context, or a function object with the correct completion
    * signature. The function signature of the completion handler must be:
    * @code void handler(
    *   const boost::system::error_code& error // Result of operation.
    * ); @endcode
    * Regardless of whether the asynchronous operation completes immediately or
    * not, the completion handler will not be invoked from within this function.
    * On immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
    *
    * @par Completion Signature
    * @code void(boost::system::error_code) @endcode
    *
    * @par Example
    * @code
    * void wait_handler(const boost::system::error_code& error)
    * {
    *   if (!error)
    *   {
    *     // Wait succeeded.
    *   }
    * }
    *
    * ...
    *
    * boost::asio::posix::stream_descriptor descriptor(my_context);
    * ...
    * descriptor.async_wait(
    *     boost::asio::posix::stream_descriptor::wait_read,
    *     wait_handler);
    * @endcode
    *
    * @par Per-Operation Cancellation
    * This asynchronous operation supports cancellation for the following
    * boost::asio::cancellation_type values:
    *
    * @li @c cancellation_type::terminal
    *
    * @li @c cancellation_type::partial
    *
    * @li @c cancellation_type::total
    */
   template <
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code))
         WaitToken = default_completion_token_t<executor_type>>
   auto async_wait(wait_type w,
       WaitToken&& token = default_completion_token_t<executor_type>())
     -> decltype(
       async_initiate<WaitToken, void (boost::system::error_code)>(
         declval<initiate_async_wait>(), token, w))
   {
     return async_initiate<WaitToken, void (boost::system::error_code)>(
         initiate_async_wait(this), token, w);
   }
 
 protected:
   /// Protected destructor to prevent deletion through this type.
   /**
    * This function destroys the descriptor, cancelling any outstanding
    * asynchronous wait operations associated with the descriptor as if by
    * calling @c cancel.
    */
   ~basic_descriptor()
   {
   }
 
 #if defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
   detail::io_object_impl<detail::io_uring_descriptor_service, Executor> impl_;
 #else // defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
   detail::io_object_impl<detail::reactive_descriptor_service, Executor> impl_;
 #endif // defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
 
 private:
   // Disallow copying and assignment.
   basic_descriptor(const basic_descriptor&) = delete;
   basic_descriptor& operator=(const basic_descriptor&) = delete;
 
   class initiate_async_wait
   {
   public:
     typedef Executor executor_type;
 
     explicit initiate_async_wait(basic_descriptor* self)
       : self_(self)
     {
     }
 
     const executor_type& get_executor() const noexcept
     {
       return self_->get_executor();
     }
 
     template <typename WaitHandler>
     void operator()(WaitHandler&& handler, wait_type w) const
     {
       // If you get an error on the following line it means that your handler
       // does not meet the documented type requirements for a WaitHandler.
       BOOST_ASIO_WAIT_HANDLER_CHECK(WaitHandler, handler) type_check;
 
       detail::non_const_lvalue<WaitHandler> handler2(handler);
       self_->impl_.get_service().async_wait(
           self_->impl_.get_implementation(), w,
           handler2.value, self_->impl_.get_executor());
     }
 
   private:
     basic_descriptor* self_;
   };
 };
 
 } // namespace posix
 } // namespace asio
 } // namespace boost
 
 #include <boost/asio/detail/pop_options.hpp>
 
 #endif // defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
        //   || defined(GENERATING_DOCUMENTATION)
 
 #endif // BOOST_ASIO_POSIX_BASIC_DESCRIPTOR_HPP

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