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From "Travis Vitek (JIRA)" <j...@apache.org>
Subject [jira] Created: (STDCXX-985) [Linux/gcc] 20.meta.rel.cpp fails is_base_of assertions
Date Wed, 02 Jul 2008 22:24:45 GMT
[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 protected and private inheritance
as required by the draft standard. It appears that 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, nonetheless, base
classes. —end 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 trait 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_class (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 much we can do about
fixing it.


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