http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58358
--- Comment #11 from Marc Glisse <glisse at gcc dot gnu.org> --- (In reply to Daniel Krügler from comment #9) > Shouldn't the library be able to use the new diamond operators > (specializations in void) that use perfect forwarding for both arguments and > result? User-code cannot specialize these operations. Perfect forwarding was never perfect, I wish that name hadn't stuck. http://gcc.gnu.org/ml/libstdc++/2012-06/msg00066.html