Re: [Boost-users] mpi/serialization: broadcasting derivedclass through base pointer

20 Jan 2012

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-----Original Message-----
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From: boost-users-bounces@lists.boost.org [mailto:boost-users-
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bounces@lists.boost.org] On Behalf Of Robert Ramey
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Sent: 20 January 2012 17:05
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To: boost-users@lists.boost.org
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Subject: Re: [Boost-users] mpi/serialization: broadcasting derivedclass
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through base pointer
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MM wrote:
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-----Original Message-----
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Hello Matthias, Robert Ramey,
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I am revisiting the topic of mpi broadcast-receiving a polymorphic
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object through a base class null pointer:
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void recv_histodata(boost::mpi::communicator& world)
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{
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historical_data_base* hd = nullptr;
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boost::mpi::broadcast(world, hd, master_process);
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}
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historical_data_base has 3 derived classes.
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I get the unregistered class exception from the serialization
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library, and so I am trying to register the derived type as shown in
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the serialization doc at /libs/serialization/doc/index.html  :
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reference
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ar.template register_type();
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but where do I put that?
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invoke that any time after the archive is created but before the
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"derived_one" is serialized.
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make sure you do it in the same place on saving an loading.  I believe
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the
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following would work.
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binary_oarchive oa(...)
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oa.template register_type;
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binary_iarchive ia(...)
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ia.template register_type;
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I went with the export guid route. It builds but it seems to go into an
infinite loop.

This is:

interface_archive.hpp

    template<class T>

    Archive & operator>>(T & t){
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this->This()->load_override(t, 0);
return * this->This();

    }

which calls itself again after a couple of in-between calls to other
functions. Here is a stack:
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nhcomp.exe!boost::archive::detail::interface_iarchive::operator>>boost::archive::class_id_type(boost::archive::class_id_t
ype & t)  Line 60     C++

nhcomp.exe!boost::archive::detail::common_iarchive::vload(boost::archive::class_id_type & t)  Line 52     C++

nhcomp.exe!boost::archive::detail::basic_iarchive_impl::load(boost::archive::detail::basic_iarchive & ar,
boost::archive::class_id_type & t)  Line 198    C++

nhcomp.exe!boost::archive::detail::basic_iarchive_impl::load_pointer(boost::
archive::detail::basic_iarchive & ar, void * & t, const
boost::archive::detail::basic_pointer_iserializer * bpis_ptr, const
boost::archive::detail::basic_pointer_iserializer * (const
boost::serialization::extended_type_info &)* finder)  Line 411    C++

      nhcomp.exe!boost::archive::detail::basic_iarchive::load_pointer(void *
& t, const boost::archive::detail::basic_pointer_iserializer * bpis_ptr,
const boost::archive::detail::basic_pointer_iserializer * (const
boost::serialization::extended_type_info &)* finder)  Line 551    C++

nhcomp.exe!boost::archive::detail::load_pointer_type::invoke(boost::mpi::packed_iarchive & ar,
nicohich::histodatas::historical_data_base * & t)  Line 524 + 0x15 bytes
C++

nhcomp.exe!boost::archive::load(boost::mpi::packed_iarchive & ar,
nicohich::histodatas::historical_data_base * & t)  Line 592 + 0xd bytes
C++

nhcomp.exe!boost::archive::detail::common_iarchive::load_override(nicohich::histodatas::historical_data_base * & t, int __formal)  Line 66
+ 0x15 bytes  C++

nhcomp.exe!boost::mpi::packed_iarchive::load_override(nicohich::histodatas::historical_data_base * & x,
int version, boost::mpl::bool_<0> __formal)  Line 102     C++

nhcomp.exe!boost::mpi::packed_iarchive::load_override(nicohich::histodatas::historical_data_base * & x,
int version)  Line 119   C++

nhcomp.exe!boost::archive::detail::interface_iarchive::operator>>(nicohich::histodatas::historical_data_base * & t)  Line 61     C++

rds,