[Bug libstdc++/55043] [4.7/4.8 Regression] issue with nesting unordered_map containing unique_ptr into vector

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55043

--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-10-24 17:36:52 UTC ---
I have a better idea: specialize is_copy_constructible for each std::container
to depend on whether its value type is CopyInsertable into it.