Move-assign a windows::basic_object_handle
from another.
basic_object_handle & operator=( basic_object_handle && other);
This assignment operator moves an object handle from one object to another.
The other windows::basic_object_handle
object
from which the move will occur.
Following the move, the moved-from object is in the same state as if constructed
using the basic_object_handle(io_service&) constructor
.