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Date: Wed, 2 Jul 2008 15:24:45 -0700 (PDT)
From: "Travis Vitek (JIRA)" <jira@apache.org>
To: issues@stdcxx.apache.org
Subject: [jira] Created: (STDCXX-985) [Linux/gcc] 20.meta.rel.cpp fails
 is_base_of assertions
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[Linux/gcc] 20.meta.rel.cpp fails is_base_of assertions
-------------------------------------------------------

                 Key: STDCXX-985
                 URL: https://issues.apache.org/jira/browse/STDCXX-985
             Project: C++ Standard Library
          Issue Type: Bug
          Components: TR1.4 - Metaprogramming and Type Traits
    Affects Versions: 4.3
         Environment: gcc-4.3
            Reporter: Travis Vitek
             Fix For: 4.3


The {{__is_base_of()}} helper provided with gcc-4.3 doesn't detect protecte=
d and private inheritance as required by the draft standard. It appears tha=
t the helper may be based on an older version of the standard and needs to =
be updated. Here is a note from the description of the {{is_base_of}} trait=
.
{quote}[Note:Base classes that are private, protected, or ambigious are, no=
netheless, base classes. =E2=80=94end note ]{quote}

This is the gcc description of the helper that they provide..
{quote}__is_base_of (base_type, derived_type)
If base_type is a base class of derived_type ([class.derived]) then the tra=
it is true, otherwise it is false. Top-level cv qualifications of base_type=
 and derived_type are ignored. For the purposes of this trait, a class type=
 is considered is own base. Requires: if __is_class (base_type) and __is_cl=
ass (derived_type) are true and base_type and derived_type are not the same=
 type (disregarding cv-qualifiers), derived_type shall be a complete type. =
Diagnostic is produced if this requirement is not met.{quote}

Since there is no way to detect this from within the library, there isn't m=
uch we can do about fixing it.


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