From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-60437-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 10644 invoked by alias); 12 Jun 2003 12:59:57 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 10580 invoked by uid 48); 12 Jun 2003 12:59:57 -0000
Date: Thu, 12 Jun 2003 12:59:00 -0000
From: "mike.reed@amadron.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20030612125956.11174.mike.reed@amadron.com>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c++/11174] New: derived class can access protected base class member function through pointer to member function
X-Bugzilla-Reason: CC
X-SW-Source: 2003-06/txt/msg01453.txt.bz2
List-Id: <gcc-bugs.sourceware.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=11174

           Summary: derived class can access protected base class member
                    function through pointer to member function
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mike.reed@amadron.com
                CC: gcc-bugs@gcc.gnu.org

Reading specs from /usr/gcc3local/lib/gcc-lib/i686-pc-linux-gnu/3.3/specs
Configured with: ../gcc-3.3/configure --prefix=/usr/gcc3local
--enable-languages=c,c++
Thread model: posix
gcc version 3.3




With the following code:


class A {
protected:
    void foo() {}
public:
    A();
};


class B : public A {
    void bar() {
        A a;
        a.foo();
        void (A::*pmf)() = &A::foo;  // 1
        (a.*pmf)();                  // 2
    }
};


Compilation gives:
g++ -W -Wall -ansi -pedantic -c pmf.cpp
pmf.cpp: In member function `void B::bar()':
pmf.cpp:3: error: `void A::foo()' is protected
pmf.cpp:12: error: within this context

Compilation exited abnormally with code 1 at Thu Jun 12 10:28:26


But note that I am able to call the protected member function of the external
object via a pointer to member function (PMF).

Looking at the C++ spec (11.5 example see void D2::mem...) I think the line
labelled 1 should be ill-formed but since the compiler doesn't think so I am
able to gain access to the protected function on the line labelled 2.