what is auto_ptr_ref, what it achieves and how it achieves it

Question

auto_ptr_ref documentation here says this

This is an instrumental class to allow certain conversions that allow auto_ptr objects to be passed to and returned

Answer 1

I just found a very good link and a name for this technique "Move Constructors" or "Colvin-Gibbons trick"

http://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Move_Constructor