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Date: Thu, 27 Apr 2006 16:28:00 -0000
Subject: [Bug c++/27339]  New: defining out-of-class specialization of value template parameter with private type
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From: "dirkmoermans at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Following code does not compile with gcc 4.1.
It compiles with gcc 3.4.0 and gcc 4.0.2 and comeau online.

=============================
class A 
{
private: 
  enum private_enum {a};

  template<A::private_enum v>  // OK 
  struct B
  {
    void bm();
  }; 
public: 
  void am() 
  { 
    B<a> instance; //OK
    instance.bm();
  }
};

template<A::private_enum v>  // FAIL
void
A::B<v>::bm(){}
=============================
The error message is:
a.cc:4: error: 'enum A::private_enum' is private
a.cc:19: error: within this context

If the member template function gets defined inline, the code compiles. 
I don't have the c++ standard available, but a technicality like an
inline/outline definition should have no impact on the validity of the code
imho. 

The same error occurrs if the enum gets replaced by a function template
typedef, or if the inner-class gets replaced by a member-function-template.

A related bug is 10849


-- 
           Summary: defining out-of-class specialization of value template
                    parameter with private type
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dirkmoermans at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27339