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In-Reply-To: <20040429.081229.846948283.rene@rocklinux-consulting.de>
To: Rene Rebe <rene@rocklinux-consulting.de>
Cc: gcc@gcc.gnu.org, valentin@rocklinux-consulting.de
MIME-Version: 1.0
Subject: Re: GCC 3.4.0 and template type resolution bug (no)
From: Michael Veksler <VEKSLER@il.ibm.com>
Message-ID: <OFB34D96D5.F16E9906-ONC2256E85.0022E35B-C2256E85.002345E1@il.ibm.com>
Date: Thu, 29 Apr 2004 08:04:00 -0000
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X-SW-Source: 2004-04/txt/msg01361.txt.bz2

gcc-3.4 is correct (gcc-3.2 was buggy). Please read gcc-3.4 release notes.

You should use this->m_info, otherwise the compiler will look for m_info=20
outside your classes,







Rene Rebe <rene@rocklinux-consulting.de>
Sent by: gcc-owner@gcc.gnu.org
29/04/2004 09:12
=20
        To:     gcc@gcc.gnu.org
        cc:     valentin@rocklinux-consulting.de
        Subject:        GCC 3.4.0 and template type resolution bug


Hi,

compiling one of our C++ projects I found a quite strange behaviour
(=3D=3Dbug?) of gcc-3.4.0. The 3.4.0 version is not able to deduce m_info
in the base template class's when the inherited class is a template,
too. Although it does work with normal classes. (Of course the code
does compile with earlier version of GCC - such as 3.2.3.)


  template <typename INFO>
  class Basic
  {
  protected:

    INFO* m_info;
  };

  template <typename INFO>
  class Std : public Basic <INFO>
  {
  public:

    bool testMe () { return m_info !=3D 0; }
  };

  class Normal : public Basic <int>
  {
  public:
    bool testMe () { return m_info !=3D 0; }
  };

int main () {
  return 0;
}

The error is:

gcc34-template.cc: In member function `bool Std<INFO>::testMe()':
gcc34-template.cc:15: error: `m_info' undeclared (first use this function)
gcc34-template.cc:15: error: (Each undeclared identifier is reported only=20
once for each function it appears in.)

Sincerely yours,
  Ren=E9 Rebe
    - ROCK Linux stable release maintainer

--=20
Ren=E9 Rebe - Europe/Germany/Berlin
  rene@rocklinux.org rene@rocklinux-consulting.de
http://www.rocklinux.org http://www.rocklinux-consulting.de