Re: [Boost-users] Problem with Boost Serialization

3 Mar 2010

      Hi,

thank you very much for your answer. I was stuck with this problem for days.
I have changed the code so that a const pointer is now passed to the
RemoteMessagingSystem::serialize:
string RemoteMessagingSystem::serialize (Message* const msg)
{
...
}

But the problem with deserialize is still there:
In file included from
/home/v0d0i/libraries/boost_1_42_0/include/boost/archive/xml_iarchive.hpp:24,
                 from message/remote/RemoteMessagingSystem.h:31,
                 from message/remote/RemoteMessagingSystem.cpp:1:
/home/v0d0i/libraries/boost_1_42_0/include/boost/archive/basic_xml_iarchive.hpp:
In member function ‘void
boost::archive::basic_xml_iarchive<Archive>::load_override(T&, int) [with T
= Message*, Archive = boost::archive::xml_iarchive]’:
/home/v0d0i/libraries/boost_1_42_0/include/boost/archive/xml_iarchive.hpp:80:  
instantiated from ‘void
boost::archive::xml_iarchive_impl<Archive>::load_override(T&, int) [with T =
Message*, Archive = boost::archive::xml_iarchive]’
/home/v0d0i/libraries/boost_1_42_0/include/boost/archive/detail/interface_iarchive.hpp:61:  
instantiated from ‘Archive&
boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T
= Message*, Archive = boost::archive::xml_iarchive]’
message/remote/RemoteMessagingSystem.cpp:164:   instantiated from here
/home/v0d0i/libraries/boost_1_42_0/include/boost/archive/basic_xml_iarchive.hpp:70:
error: no matching function for call to
‘assertion_failed(mpl_::failed************
boost::serialization::is_wrapper::************)’
make[1]: *** [RemoteMessagingSystem.o] Error 1
make[1]: Leaving directory `/home/v0d0i/workspace/trunk1/src/base'
make: *** [all-recursive] Error 1

Here is the code fragement:
Message* RemoteMessagingSystem::deserialize (string data)
{
	stringstream archivStream (data, ios_base::binary | ios_base::in);
#ifdef REMOTE_XML
	boost::archive::xml_iarchive inputArchive( archivStream );
#else
	boost::archive::binary_iarchive inputArchive( archivStream );
#endif

	Message* msg = NULL;  //line 164
	inputArchive >> msg;

	return msg;
}

Should I also change here Message* to Message* const?

Actually it is something strange because with the old versoin Boost 1.38
there are no compiling errors. Since i compiled and installed the new
version 1.42 i got those errors. Something should be changed between the 2
versions although i have compared the both source codes but do not find any
difference :/ 

Regards,
Binh

Matthias Troyer-2 wrote:
...
On 3 Mar 2010, at 00:44, Binh Luong wrote:
...
Hi,
Matthias Troyer-2 wrote:
...
You should not have to define your class as a wrapper. Can you send the
code fragment that causes the problem?
Matthias
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here are the code segments that cause the problem:
As you see in the last message, there are errors in
RemoteMessagingSystem.cpp:147 and RemoteMessagingSystem.cpp:147. They are
the following 2 functions which serializes the obj Message to xml archive
and deserializes xml archive backwards to obj Message.
string RemoteMessagingSystem::serialize (Message* msg)
{
  stringstream archiveStream (ios_base::binary | ios_base::out);
  { 
#ifdef REMOTE_XML
      boost::archive::xml_oarchive outputArchive( archiveStream );
#else
      boost::archive::binary_oarchive outputArchive( archiveStream );
#endif //REMOTE_XML
      outputArchive & msg;  //line 147
  }
string data = archiveStream.str();
  return data;
}
Message* RemoteMessagingSystem::deserialize (string data)
{
  stringstream archivStream (data, ios_base::binary | ios_base::in);
#ifdef REMOTE_XML
  boost::archive::xml_iarchive inputArchive( archivStream );
#else
  boost::archive::binary_iarchive inputArchive( archivStream );
#endif
Message* msg = NULL;
  inputArchive >> msg;   // line 164
return msg;
}
Two things:
1.) You need to wrap the object into a NVP to use it with XML archives.
2.) You can only serialize const objects into a output archive, hence try
passing a const pointer to the RemoteMessagingSystem::serialize function
Matthias
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