Re: [Boost-users] [boost][serialization] How to implementserializationclasses in two DLLs

From: Marc VIALA (mviala_at_[hidden])
Date: 2006-02-02 04:30:59

Hi Robert,
 
Thanks to handle my request; I’ve looked the source directory “test” and
“examples” of boost::serialization ver#1.33.1 and I didn’t find the test
that you’ve pointed in your reply. 
 
What’s the name of the test demonstrating separate compilation? 
 
Marc Viala
 <mailto:mviala_at_[hidden]> mailto:mviala_at_[hidden]
  _____  

De : boost-users-bounces_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] De la part de Robert Ramey
Envoyé : mercredi 1 février 2006 22:59
À : boost-users_at_[hidden]
Objet : Re: [Boost-users] [boost][serialization] How to
implementserializationclasses in two DLLs
 
Truth is I havn't gotten to it.  Sorry.  Its a very tricky area.  One thing
you might want to look at is the test which shows separate compilation.
This avoids having the "same" code in both the executable and the dll which
might help.
 
Robert Ramey
 
"Marc Viala" <mviala_at_[hidden]> wrote in message
news:92DC6B03E56CE74D9463089D3BF0A71068B911_at_serveur.acticm.com...
Hi,
 
I’m very sorry to post the message hereafter a second time, but I’ve not
received any reply, maybe I’ve missed it.
 
Any workaround or recommendations will be welcome because we are right now
surrounded in our software development. 
 
Thanks in advance.              
 
Marc VIALA
 
 
 
After few hour on the subject, I’m would like to have some explanations &
recommendations one the boost serialization library. To explain, my problem,
you will find hereafter a VC++ 7.1 project that demonstrates it. 
 
Problem Description 
We have involved in a large project with for example two DLLs libraries:
LibA and LibB. These libraries define & implement one class, let’s say
libA::A and libB::B. These two classes can be serialized through boost
serialization engine. 
 
The interfaces for the two classes are the same:
 
----------------------
struct LIBA_API A 
{
  std::vector<double> my_vector ;
 
private:
  friend class boost::serialization::access;
  template<class Archive> 
    void save(Archive & ar, const unsigned int version) const ;
  template<class Archive>
    void load(Archive & ar, const unsigned int version) ;
 
  BOOST_SERIALIZATION_SPLIT_MEMBER()
};
 
  LIBA_API 
    void save(const libA::A* pObj, std::ostream& os) ;
  LIBA_API 
    void load(libA::A* &pObj, std::istream& is) ;
}; // Namespace libA
----------------------
 
The two free functions save() and load() are defined to be able to serialize
the class libA::A (respectively the class libB::B). 
 
When, we try to use these interfaces in an EXE application:
 
----------------------
#include <LibA/A.h>
#include <LibB/B.h>
 
#include <boost/filesystem/path.hpp>
#include <boost/filesystem/fstream.hpp>
 
#pragma comment(lib, "liba_d.lib")
#pragma comment(lib, "libb_d.lib")
 
int
main(int argc, char* argv[])
{
  libA::A a;
  libA::save(&a, boost::filesystem::ofstream("a.xml"));
 
  libB::B b;
  libB::save(&b, boost::filesystem::ofstream("b.xml")); // -> Assert in
debug mode
 
  return 0;
}
----------------------
 
The figure hereafter describes the relationships between LibA, LibB and EXE
application:
                      ------------                              ------------
                      |       LibA      |                              |
LibB       |
                      ------------
------------
                                             \                          /
                                               \                       /

                                                  Exe Application
 
We have to face to an assert in debug mode generate by the file
boost::serialization::extended_type_info.cpp, line#71. This assert happens
during the instance serialization of class libB:B. 
 
Recently, there are some posts on this subject, but I would like to known
how I can deal with this assert? Is it possible to avoid it by a code
organisation? Is it possible to comment this assert?
 
To have a concrete answer, I have joined my complete VC++7.1 project. 
 
Thanks in advance for your help.
 
Development Platform
WindowsXP 
VC++ 7.1
Boost 1.33.1
 
Marc Viala
 <mailto:mviala_at_[hidden]> mailto:mviala_at_[hidden]
 
 
 

  _____  

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