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Move-assign a posix::basic_stream_descriptor from another.
        
basic_stream_descriptor & operator=( basic_stream_descriptor && other);
This assignment operator moves a stream descriptor from one object to another.
                The other posix::basic_stream_descriptor
                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_stream_descriptor(io_service&) constructor.