[Bug c++/12119] New: Inherited protected member not accessible.

["richard dot kreckel at ginac dot de" <gcc-bugzilla at gcc dot gnu dot org>]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12119

           Summary: Inherited protected member not accessible.
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: richard dot kreckel at ginac dot de
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu

The following does not compile under GCC-3.4-20030827.  It used to compile
with GCC-3.3.  The code was distilled from a library attempting to implement
multiple dispatch manually via templates.


class dispatcher {
public:
    template <class T>
    dispatcher& notice(void (T::*f)(void));
};

class A {
protected:
    void do_onething() const;
private:
    static dispatcher reginfo;
};

dispatcher A::reginfo = dispatcher().notice(&A::do_onething);

class B : public A {
protected:
    void do_otherthing() const;
private:
    static dispatcher reginfo;
};

dispatcher B::reginfo = dispatcher().notice(&A::do_onething);

Compiling above snippet yields:
$ c++ -c dispatcher.cpp
dispatcher.cpp:9: error: `void A::do_onething() const' is protected
dispatcher.cpp:24: error: within this context

Notice, that changing the last line to
dispatcher B::reginfo = dispatcher().notice(&B::do_otherthing);
makes it compile, so this is obviously a bug in GCC.

Regards
   -richy.
-- 
Richard B. Kreckel
<http://www.ginac.de/~kreckel/>