http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58815
--- Comment #8 from Daniel Krügler <daniel.kruegler at googlemail dot com> --- (In reply to Paolo Carlini from comment #6) I also would like to encourage using explicit conversion functions. This is explicitly suggested in the updated C++11 integration document: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3407.html