Hi, It looks like is_nothrow_move_constructible (in branch develop, on testers igaztanaga-gcc-4.6c++11 and igaztanaga-gcc-4.7c++11) fails the compilation rather than returning a true-false answer. <http://www.boost.org/development/tests/develop/igaztanaga-gcc-4-7c++11.html>I filed a ticket for it: https://svn.boost.org/trac/boost/ticket/11811 Reards, &rzej