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 //
 // windows/basic_object_handle.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 // Copyright (c) 2011 Boris Schaeling (boris@highscore.de)
 //
 // 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_WINDOWS_BASIC_OBJECT_HANDLE_HPP
 #define BOOST_ASIO_WINDOWS_BASIC_OBJECT_HANDLE_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_WINDOWS_OBJECT_HANDLE) \
   || defined(GENERATING_DOCUMENTATION)
 
 #include <utility>
 #include <boost/asio/any_io_executor.hpp>
 #include <boost/asio/async_result.hpp>
 #include <boost/asio/detail/io_object_impl.hpp>
 #include <boost/asio/detail/throw_error.hpp>
 #include <boost/asio/detail/win_object_handle_service.hpp>
 #include <boost/asio/error.hpp>
 #include <boost/asio/execution_context.hpp>
 
 #include <boost/asio/detail/push_options.hpp>
 
 namespace boost {
 namespace asio {
 namespace windows {
 
 /// Provides object-oriented handle functionality.
 /**
  * The windows::basic_object_handle class provides asynchronous and blocking
  * object-oriented handle functionality.
  *
  * @par Thread Safety
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
  */
 template <typename Executor = any_io_executor>
 class basic_object_handle
 {
 private:
   class initiate_async_wait;
 
 public:
   /// The type of the executor associated with the object.
   typedef Executor executor_type;
 
   /// Rebinds the handle type to another executor.
   template <typename Executor1>
   struct rebind_executor
   {
     /// The handle type when rebound to the specified executor.
     typedef basic_object_handle<Executor1> other;
   };
 
   /// The native representation of a handle.
 #if defined(GENERATING_DOCUMENTATION)
   typedef implementation_defined native_handle_type;
 #else
   typedef boost::asio::detail::win_object_handle_service::native_handle_type
     native_handle_type;
 #endif
 
   /// An object handle is always the lowest layer.
   typedef basic_object_handle lowest_layer_type;
 
   /// Construct an object handle without opening it.
   /**
    * This constructor creates an object handle without opening it.
    *
    * @param ex The I/O executor that the object handle will use, by default, to
    * dispatch handlers for any asynchronous operations performed on the
    * object handle.
    */
   explicit basic_object_handle(const executor_type& ex)
     : impl_(0, ex)
   {
   }
 
   /// Construct an object handle without opening it.
   /**
    * This constructor creates an object handle without opening it.
    *
    * @param context An execution context which provides the I/O executor that
    * the object handle will use, by default, to dispatch handlers for any
    * asynchronous operations performed on the object handle.
    */
   template <typename ExecutionContext>
   explicit basic_object_handle(ExecutionContext& context,
       constraint_t<
         is_convertible<ExecutionContext&, execution_context&>::value,
         defaulted_constraint
       > = defaulted_constraint())
     : impl_(0, 0, context)
   {
   }
 
   /// Construct an object handle on an existing native handle.
   /**
    * This constructor creates an object handle object to hold an existing native
    * handle.
    *
    * @param ex The I/O executor that the object handle will use, by default, to
    * dispatch handlers for any asynchronous operations performed on the
    * object handle.
    *
    * @param native_handle The new underlying handle implementation.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   basic_object_handle(const executor_type& ex,
       const native_handle_type& native_handle)
     : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(), native_handle, ec);
     boost::asio::detail::throw_error(ec, "assign");
   }
 
   /// Construct an object handle on an existing native handle.
   /**
    * This constructor creates an object handle object to hold an existing native
    * handle.
    *
    * @param context An execution context which provides the I/O executor that
    * the object handle will use, by default, to dispatch handlers for any
    * asynchronous operations performed on the object handle.
    *
    * @param native_handle The new underlying handle implementation.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   template <typename ExecutionContext>
   basic_object_handle(ExecutionContext& context,
       const native_handle_type& native_handle,
       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_handle, ec);
     boost::asio::detail::throw_error(ec, "assign");
   }
 
   /// Move-construct an object handle from another.
   /**
    * This constructor moves an object handle from one object to another.
    *
    * @param other The other object handle 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_object_handle(const executor_type&)
    * constructor.
    */
   basic_object_handle(basic_object_handle&& other)
     : impl_(std::move(other.impl_))
   {
   }
 
   /// Move-assign an object handle from another.
   /**
    * This assignment operator moves an object handle from one object to another.
    *
    * @param other The other object handle 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_object_handle(const executor_type&)
    * constructor.
    */
   basic_object_handle& operator=(basic_object_handle&& other)
   {
     impl_ = std::move(other.impl_);
     return *this;
   }
 
   // All handles have access to each other's implementations.
   template <typename Executor1>
   friend class basic_object_handle;
 
   /// Move-construct an object handle from a handle of another executor type.
   /**
    * This constructor moves an object handle from one object to another.
    *
    * @param other The other object handle 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_object_handle(const executor_type&)
    * constructor.
    */
   template<typename Executor1>
   basic_object_handle(basic_object_handle<Executor1>&& other,
       constraint_t<
         is_convertible<Executor1, Executor>::value,
         defaulted_constraint
       > = defaulted_constraint())
     : impl_(std::move(other.impl_))
   {
   }
 
   /// Move-assign an object handle from a handle of another executor type.
   /**
    * This assignment operator moves an object handle from one object to another.
    *
    * @param other The other object handle 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_object_handle(const executor_type&)
    * constructor.
    */
   template<typename Executor1>
   constraint_t<
     is_convertible<Executor1, Executor>::value,
     basic_object_handle&
   > operator=(basic_object_handle<Executor1>&& other)
   {
     impl_ = std::move(other.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 an object handle 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 an object handle 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 handle to the handle.
   /*
    * This function opens the handle to hold an existing native handle.
    *
    * @param handle A native handle.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   void assign(const native_handle_type& handle)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(), handle, ec);
     boost::asio::detail::throw_error(ec, "assign");
   }
 
   /// Assign an existing native handle to the handle.
   /*
    * This function opens the handle to hold an existing native handle.
    *
    * @param handle A native handle.
    *
    * @param ec Set to indicate what error occurred, if any.
    */
   BOOST_ASIO_SYNC_OP_VOID assign(const native_handle_type& handle,
       boost::system::error_code& ec)
   {
     impl_.get_service().assign(impl_.get_implementation(), handle, ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Determine whether the handle is open.
   bool is_open() const
   {
     return impl_.get_service().is_open(impl_.get_implementation());
   }
 
   /// Close the handle.
   /**
    * This function is used to close the handle. 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.
    */
   void close()
   {
     boost::system::error_code ec;
     impl_.get_service().close(impl_.get_implementation(), ec);
     boost::asio::detail::throw_error(ec, "close");
   }
 
   /// Close the handle.
   /**
    * This function is used to close the handle. 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.
    */
   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 handle representation.
   /**
    * This function may be used to obtain the underlying representation of the
    * handle. This is intended to allow access to native handle functionality
    * that is not otherwise provided.
    */
   native_handle_type native_handle()
   {
     return impl_.get_service().native_handle(impl_.get_implementation());
   }
 
   /// Cancel all asynchronous operations associated with the handle.
   /**
    * 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 handle.
   /**
    * 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 a blocking wait on the object handle.
   /**
    * This function is used to wait for the object handle to be set to the
    * signalled state. This function blocks and does not return until the object
    * handle has been set to the signalled state.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   void wait()
   {
     boost::system::error_code ec;
     impl_.get_service().wait(impl_.get_implementation(), ec);
     boost::asio::detail::throw_error(ec, "wait");
   }
 
   /// Perform a blocking wait on the object handle.
   /**
    * This function is used to wait for the object handle to be set to the
    * signalled state. This function blocks and does not return until the object
    * handle has been set to the signalled state.
    *
    * @param ec Set to indicate what error occurred, if any.
    */
   void wait(boost::system::error_code& ec)
   {
     impl_.get_service().wait(impl_.get_implementation(), ec);
   }
 
   /// Start an asynchronous wait on the object handle.
   /**
    * This function is be used to initiate an asynchronous wait against the
    * object handle. It is an initiating function for an @ref
    * asynchronous_operation, and always returns immediately.
    *
    * @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
    */
   template <
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code))
         WaitToken = default_completion_token_t<executor_type>>
   auto async_wait(
       WaitToken&& token = default_completion_token_t<executor_type>())
     -> decltype(
       async_initiate<WaitToken, void (boost::system::error_code)>(
         declval<initiate_async_wait>(), token))
   {
     return async_initiate<WaitToken, void (boost::system::error_code)>(
         initiate_async_wait(this), token);
   }
 
 private:
   // Disallow copying and assignment.
   basic_object_handle(const basic_object_handle&) = delete;
   basic_object_handle& operator=(const basic_object_handle&) = delete;
 
   class initiate_async_wait
   {
   public:
     typedef Executor executor_type;
 
     explicit initiate_async_wait(basic_object_handle* self)
       : self_(self)
     {
     }
 
     const executor_type& get_executor() const noexcept
     {
       return self_->get_executor();
     }
 
     template <typename WaitHandler>
     void operator()(WaitHandler&& handler) 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(),
           handler2.value, self_->impl_.get_executor());
     }
 
   private:
     basic_object_handle* self_;
   };
 
   boost::asio::detail::io_object_impl<
     boost::asio::detail::win_object_handle_service, Executor> impl_;
 };
 
 } // namespace windows
 } // namespace asio
 } // namespace boost
 
 #include <boost/asio/detail/pop_options.hpp>
 
 #endif // defined(BOOST_ASIO_HAS_WINDOWS_OBJECT_HANDLE)
        //   || defined(GENERATING_DOCUMENTATION)
 
 #endif // BOOST_ASIO_WINDOWS_BASIC_OBJECT_HANDLE_HPP

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