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Boost.Asio provides Windows-specific classes that permit asynchronous wait operations to be performed on HANDLEs to kernel objects of the following types:
For example, to perform asynchronous operations on an event, the following object may be created:
HANDLE handle = ::CreateEvent(...); windows::object_handle file(my_io_context, handle);
          The wait() and async_wait() member functions
          may then be used to wait until the kernel object is signalled.
        
          Windows object HANDLEs are only available at compile time
          when targeting Windows. Programs may test for the macro BOOST_ASIO_HAS_WINDOWS_OBJECT_HANDLE
          to determine whether they are supported.