http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50641
--- Comment #5 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2011-10-07 07:13:50 UTC --- (In reply to comment #4) > N3242 says that From needs to be > "convertible" to To, but I'm not at all convinced that "convertible" means the > same thing as "is_convertible". Maybe if it's illegal I'll file a DR some > day. It really means the same, "implicit conversion" is currently identical to "copy-initialization". Note that the example here is addressed by LWG issue 2005 and it should work, once the specification changes it "is convertible" requirement to a corresponding "is constructible" requirement. The current P/R of LWG 2005 does not contain the revised wording suggestion, though.