http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53036
--- Comment #2 from Marc Glisse <marc.glisse at normalesup dot org> 2012-04-19 12:14:04 UTC --- Created attachment 27189 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27189 basic patch The patch detects D as trivial. Sadly, on this case: struct A { A()=default; A(int=2); }; it says A is trivial whereas I guess the ambiguity makes it non-trivial. That could be solved for the traits by combining it with is_default_constructible, but it may be problematic to let g++ internally believe that the class is trivially default constructible. For some strange reason, in the case of an ellipsis: struct A { A()=default; A(...); }; it does say: non-trivial. Maybe the whole dance should only be done if the constructor argument is a parameter pack (one that belongs to the function? or several packs?).
