Re: [Boost-bugs] [Boost C++ Libraries] #9799: polymorphic_downcast does not support virtual inheritance

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9799: polymorphic_downcast does not support virtual inheritance
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-03-20 23:29:11

#9799: polymorphic_downcast does not support virtual inheritance
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  Reporter:  Camille Gillot <k1000.jlo@…>  |      Owner:  no-maintainer
      Type:  Patches                       |     Status:  closed
 Milestone:  To Be Determined              |  Component:  utility
   Version:  Boost 1.54.0                  |   Severity:  Problem
Resolution:  wontfix                       |   Keywords:
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Comment (by Camille Gillot <k1000.jlo@…>):

 IMHO, in the case of virtual inheritance, dynamic_cast being the only
 viable way makes it the most efficient.

 Still, this function not handling virtual inheritance should be documented
 : the current documentation does not tell anything about this case.
 Moreover, I don't think that static_cast's not handling this case is well-
 known enough.

 Sorry for the patch, copy-paste errors come from a workaround used
 elsewhere. Here comes a corrected version of the patch (which does
 compile).

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9799#comment:2>
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