Re: [Boost-users] [Serialization] issue withportable_binary_oarchive

From: Robert Ramey (ramey_at_[hidden])
Date: 2007-03-01 19:47:01

For starters, you should use ios::binary flag on the files.

But still I have a problem with this - I'm looking into it.

Robert Ramey

Dan Leibovich wrote:
> Hi again,
>
> I was able to create a minimal test case to reproduce the problem.
> I found that the problem occurs when a class includes a pointer to
> the same type as the class.
>
> I added the following to portable_binary_oarchive.hpp
> void save(const unsigned short t){
>    save_impl(t);
> }
> void save(const short t){
>    save_impl(t);
> }
>
> and to portable_binary_iarchive.hpp
> void load(unsigned short & t){
>    long l;
>    load_impl(l, sizeof(unsigned short));
>    t = l;
> }
> void load(short & t){
>     long l;
>     load_impl(l, sizeof(short));
>     t = l;
> }
>
> The program below fails on asserts:
> When the class has virtual method:
>
> boost/archive/basic_binary_iprimitive.hpp:112: void
> boost::archive::basic_binary_iprimitive<Archive,
> IStream>::load_binary(void*, unsigned int) [with Archive =
> portable_binary_iarchive, IStream = std::basic_istream<char,
> std::char_traits<char> >]: Assertion
> `static_cast<std::size_t>((std::numeric_limits<std::streamsize>::max)())
> >= count' failed.
>
> otherwise:
>
> basic_iarchive.cpp:466: const
> boost::archive::detail::basic_pointer_iserializer*
> boost::archive::detail::basic_iarchive_impl::load_pointer(boost::archive::detail::basic_iarchive&,
> void*&, const boost::archive::detail::basic_pointer_iserializer*,
> const boost::archive::detail::basic_pointer_iserializer*(*)(const
> boost::serialization::extended_type_info&)): Assertion `new_cid ==
> cid' failed.
>
> The program:
>
> #include <boost/serialization/access.hpp>
> #include "portable_binary_oarchive.hpp"
> #include "portable_binary_iarchive.hpp"
> #include <fstream>
>
> class A {
> public:
>  int x;
>  A* a ;
>
>  template<class Archive>
>  void serialize (Archive & ar, const unsigned int version)
>  {
>    ar & x ;
>    ar & a ;
>  }
>
>  A() {}
>  A(int x_) : x(x_), a(0) {}
>  virtual void foo() {} ;  // if removed - another kind of assert
> };
>
> int main() {
>  char* file = "file" ;
>  std::ofstream ofs(file) ;
>  portable_binary_oarchive oar(ofs) ;
>  const A a(1);
>
>  oar << a ;
>
>  ofs.close() ;
>
>  A aa ;
>
>  std::ifstream ifs(file) ;
>  portable_binary_iarchive iar(ifs) ;
>  iar >> aa ;
> }
>
> Thanks,
> Dan Leibovich
>
>
>
>
>
>
> -----Original Message-----
> From: boost-users-bounces_at_[hidden]
> [mailto:boost-users-bounces_at_[hidden]] On Behalf Of Robert
> Ramey
> Sent: ã 28 ôáøåàø 2007 22:05
> To: boost-users_at_[hidden]
> Subject: Re: [Boost-users] [Serialization] issue
> withportable_binary_oarchive
>
> Hmm- that would seem to suggest that bpis_ptr is NULL or something.
>
> I would guess that browsing the stack trace with the debugger might
> shed light here.  It that doesn't resolve the issue, make a small
> program that illustrates the problem so I can run it here.
>
> Note that in my previous email, I suggested a change in the one of
> the libraries headers involving loading and const.  It turns out that
> this change isn't appropriate.  I presume you found that as it fails
> to compile.
>
> I don't think this issue would be affected by moving to a later
> version.
>
> Robert Ramey
>
>
> Dan Leibovich wrote:
>> Hi,
>>
>> I have added the specializations methods for short and now the
>> serialization output is the same for both platforms (linux and
>> solaris).
>>
>> But when I try to load the dump file, the program received seg fault
>> signal in boost::archive::detail::basic_iarchive_impl::load_pointer()
>> on: bpis_ptr->load_object_ptr(ar, t, co.file_version);
>>
>> I will be happy to try any changes you suggest.
>>
>> I have noticed (according to your code change suggestions) that I do
>> not have the latest version of the lib.
>> I downloaded boost 1.33.1 , should I download newer version and if so
>> how can I do it?
>>
>> Thanks
>> Dan Leibovich
>
>
>
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