Re: [Boost-bugs] [Boost C++ Libraries] #4676: Ambiguous register_type with polymorphic_x_?archive on g++

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4676: Ambiguous register_type with polymorphic_x_?archive on g++
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-09-26 21:39:48

#4676: Ambiguous register_type with polymorphic_x_?archive on g++
--------------------------------+-------------------------------------------
  Reporter:  Richard Hazlewood  |       Owner:  ramey                                
      Type:  Patches            |      Status:  new                                  
 Milestone:  To Be Determined   |   Component:  serialization                        
   Version:  Boost 1.44.0       |    Severity:  Problem                              
Resolution:                     |    Keywords:  gcc g++ ambiguous polymorphic archive
--------------------------------+-------------------------------------------

Comment (by Richard Hazlewood <boost@…>):

 The "using" is a convenience (std: 7.3.3) to bring one of the routes to
 '''register_type<>''' into scope of the '''polymorphic_?archive_route'''
 classes.  However, if you are concerned that a compiler may not support
 it, a routing '''register_type<>''', as you specify, achieves the same
 ends - it matters not to me.

 However, I suspect it will have to go at the same place as the using
 patch; i.e. in the '''archive::detail::polymorphic_?archive_route'''
 classes.  It is at this point in the hierarchy that the two ambiguous
 routes to '''register_type<>''' (interface_?archive) occur; taking
 '''polymorphic_binary_oarchive''' as an example:

 {{{
 polymorphic_binary_oarchive:

       polymorphic_oarchive_route<>
                    |
    ----------------------------------------
    |                                      |
 polymorphic_oarchive           (ArchiveImplementation)
    |                           binary_oarchive_impl<naked_binary_oarchive>
 interface_oarchive<poly_oa>               |
 basic_binary_oarchive<naked_binary_oarchive>
                                           |
                                common_oarchive<naked_binary_oarchive>
                                           |
                                -----------------------------
                                |                           |
                          basic_oarchive
 interface_oarchive<naked_binary_oarchive>
 }}}

 I'm happy to test anything you have; is it on a branch in the SVN
 repository?

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4676#comment:3>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.