They are quite complex and with a lot of ugly corners. I cannot but think that there must be a better solution. The problem is that smarter and better programm

They are quite complex and with a lot of ugly corners. I cannot but think that there must be a better solution. The problem is that smarter and better programmes than me couldn't find one that would fit cleanly in the existing language after almost a decade of trying (boost had library based move emulation at the turn of the millennium, and the same authors came up with universal refs).