From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-help-return-20819-listarch-gcc-help=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 22556 invoked by alias); 12 Jul 2005 21:51:46 -0000
Mailing-List: contact gcc-help-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Archive: <http://gcc.gnu.org/ml/gcc-help/>
List-Post: <mailto:gcc-help@gcc.gnu.org>
List-Help: <mailto:gcc-help-help@gcc.gnu.org>
Sender: gcc-help-owner@gcc.gnu.org
Received: (qmail 22545 invoked by uid 22791); 12 Jul 2005 21:51:42 -0000
Received: from wproxy.gmail.com (HELO wproxy.gmail.com) (64.233.184.194)
    by sourceware.org (qpsmtpd/0.30-dev) with ESMTP; Tue, 12 Jul 2005 21:51:42 +0000
Received: by wproxy.gmail.com with SMTP id i22so41259wra
        for <gcc-help@gcc.gnu.org>; Tue, 12 Jul 2005 14:51:41 -0700 (PDT)
Received: by 10.54.122.18 with SMTP id u18mr86231wrc;
        Tue, 12 Jul 2005 14:51:40 -0700 (PDT)
Received: by 10.54.72.9 with HTTP; Tue, 12 Jul 2005 14:51:40 -0700 (PDT)
Message-ID: <2e393d0805071214511077e14b@mail.gmail.com>
Date: Tue, 12 Jul 2005 21:51:00 -0000
From: corey taylor <corey.taylor@gmail.com>
Reply-To: corey taylor <corey.taylor@gmail.com>
To: Paul Dubuc <pdubuc@cas.org>
Subject: Re: Use of pointer to protected member function won't compile in 3.4.4
Cc: gcc-help@gcc.gnu.org
In-Reply-To: <42D43A2E.4060700@cas.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
References: <42D43A2E.4060700@cas.org>
X-SW-Source: 2005-07/txt/msg00123.txt.bz2

This has been changed since 3.4.0 and is noted in the last bullet of
the C++ changes:

http://gcc.gnu.org/gcc-3.4/changes.html

corey

On 7/12/05, Paul Dubuc <pdubuc@cas.org> wrote:
> This code will compile with g++ 3.3.4, but 3.4.4 gives me the following e=
rror:
>=20
> Test.cc: In member function `const char* Derived::getCharge() const':
> Test.cc:18: error: `char* Base::makeCharge_(const char*) const' is protec=
ted
> Test.cc:31: error: within this context
>=20
> Why can't the Derived class use a pointer to it's Base class' protected m=
ember
> function?  Is this a bug in 3.4.4, or is this no longer allowed?
>=20
> Help!
>=20
> Here's the code:
>=20
> class Base {
>=20
> protected:
>=20
>      const char * getAttr_(unsigned char type,
>          char * (Base::*pf)(const char *) const) const;
>=20
>      char * makeCharge_(const char *) const;
> };
>=20
> const char * Base::getAttr_(unsigned char type,
>      char * (Base::*pf)(const char *) const) const
> {
>      return 0;
> }
>=20
> char * Base::makeCharge_(const char * ptr) const
> {
>      return 0;
> }
>=20
> class Derived : public Base {
>=20
> public:
>=20
>      const char * getCharge() const;
> };
>=20
> const char * Derived::getCharge() const
> {
>      return(getAttr_(0, &Base::makeCharge_));
> }
>=20
>=20
> --
> Paul M. Dubuc
>=20
> "It is not enough to do your best; you must know what to do, and THEN do =
your
> best." -- W. Edwards Deming
>