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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/45917] Friend of friend is allowed the access to the private type through the template
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45917

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.10.06 21:40:27
     Ever Confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2010-10-06 21:40:27 UTC ---
(In reply to comment #0)
> class F declares class Q a friend

There's no need for that, Q is a member of F so has access like any other
member.

Reduced:

template<class T>
struct list
{
  struct nested { };
};


class F
{
  struct R { };
  class Q
  {
    friend void f(const Q &q) { list<R>::nested n; }
  };
};