http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46004
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2010-10-13 13:24:59 UTC --- Aaaaah! thanks for clearing that up. So in cases where I do want/need a template ctor with &&-style deduction I'll use enable_if to prevent it being instantiated to perform a copy. thanks again