http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55472
--- Comment #1 from walker_643 at yahoo dot com 2012-11-26 19:48:15 UTC --- I believe the code to be valid C++11, and, indeed it does compile, link, and run on gcc 4.5 (as seen here http://ideone.com/VvFuMs ), but no GCC versions 4.7 - 4.8 are able to link properly.