text: //
  // windows/basic_object_handle.hpp
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2018 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 ASIO_WINDOWS_BASIC_OBJECT_HANDLE_HPP
  #define ASIO_WINDOWS_BASIC_OBJECT_HANDLE_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include "../../../../../asio/asio/include/asio/detail/config.hpp"
  
  #if defined(ASIO_ENABLE_OLD_SERVICES)
  
  #if defined(ASIO_HAS_WINDOWS_OBJECT_HANDLE) \
    || defined(GENERATING_DOCUMENTATION)
  
  #include "asio/detail/throw_error.hpp"
  #include "asio/error.hpp"
  #include "asio/windows/basic_handle.hpp"
  #include "asio/windows/object_handle_service.hpp"
  
  #include "asio/detail/push_options.hpp"
  
  namespace asio {
  namespace windows {
  
  /// Provides object-oriented handle functionality.
  /**
   * The windows::basic_object_handle class template provides asynchronous and
   * blocking object-oriented handle functionality.
   *
   * @par Thread Safety
   * @e Distinct @e objects: Safe.@n
   * @e Shared @e objects: Unsafe.
   */
  template <typename ObjectHandleService = object_handle_service>
  class basic_object_handle
    : public basic_handle<ObjectHandleService>
  {
  public:
    /// The native representation of a handle.
    typedef typename ObjectHandleService::native_handle_type native_handle_type;
  
    /// Construct a basic_object_handle without opening it.
    /**
     * This constructor creates an object handle without opening it.
     *
     * @param io_context The io_context object that the object handle will use to
     * dispatch handlers for any asynchronous operations performed on the handle.
     */
    explicit basic_object_handle(asio::io_context& io_context)
      : basic_handle<ObjectHandleService>(io_context)
    {
    }
  
    /// Construct a basic_object_handle on an existing native handle.
    /**
     * This constructor creates an object handle object to hold an existing native
     * handle.
     *
     * @param io_context The io_context object that the object handle will use to
     * dispatch handlers for any asynchronous operations performed on the handle.
     *
     * @param native_handle The new underlying handle implementation.
     *
     * @throws asio::system_error Thrown on failure.
     */
    basic_object_handle(asio::io_context& io_context,
        const native_handle_type& native_handle)
      : basic_handle<ObjectHandleService>(io_context, native_handle)
    {
    }
  
  #if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
    /// Move-construct a basic_object_handle from another.
    /**
     * This constructor moves an object handle from one object to another.
     *
     * @param other The other basic_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(io_context&) constructor.
     */
    basic_object_handle(basic_object_handle&& other)
      : basic_handle<ObjectHandleService>(
          ASIO_MOVE_CAST(basic_object_handle)(other))
    {
    }
  
    /// Move-assign a basic_object_handle from another.
    /**
     * This assignment operator moves an object handle from one object to another.
     *
     * @param other The other basic_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(io_context&) constructor.
     */
    basic_object_handle& operator=(basic_object_handle&& other)
    {
      basic_handle<ObjectHandleService>::operator=(
          ASIO_MOVE_CAST(basic_object_handle)(other));
      return *this;
    }
  #endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
  
    /// 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 asio::system_error Thrown on failure.
     */
    void wait()
    {
      asio::error_code ec;
      this->get_service().wait(this->get_implementation(), ec);
      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(asio::error_code& ec)
    {
      this->get_service().wait(this->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 always returns immediately.
     *
     * @param handler The handler to be called when the object handle is set to
     * the signalled state. 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().
     */
    template <typename WaitHandler>
    ASIO_INITFN_RESULT_TYPE(WaitHandler,
        void (asio::error_code))
    async_wait(ASIO_MOVE_ARG(WaitHandler) handler)
    {
      return this->get_service().async_wait(this->get_implementation(),
          ASIO_MOVE_CAST(WaitHandler)(handler));
    }
  };
  
  } // namespace windows
  } // namespace asio
  
  #include "asio/detail/pop_options.hpp"
  
  #endif // defined(ASIO_HAS_WINDOWS_OBJECT_HANDLE)
         //   || defined(GENERATING_DOCUMENTATION)
  
  #endif // defined(ASIO_ENABLE_OLD_SERVICES)
  
  #endif // ASIO_WINDOWS_BASIC_OBJECT_HANDLE_HPP
  