[Bug c++/52965] c++11 - subclass is private, but g++ ignores access modifier when using auto

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52965

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-04-12 
22:56:05 UTC ---
I don't think it's a bug.

G++ doesn't ignore access checking, you never use the name PVT so there's no
violation.  The type exists, you just can't access the name PVT.

But you can give it a new name e.g.

template<typename T>
void f(T t)
{
  typedef T type;
}

f(c.p());

Or, closer to the auto case:

decltype(c.p()) p = c.p();