Re: [Boost-users] [serialization / shared_ptr] Problem to serialize ashared_ptr

31 Mar 2007

      STATIC_ASSERTION_FAILURE

indicates that some error condition has been detected at compile time.

In all such cases, there is a comment indicating the likely cause of the
error.  I don't know which version of boost your using so I can't look
for the comment for you - but I'm sure you can find it now you know
what to look for.

Looking at you code, I can see you're trying to serialize a shared
pointer to an integer.  addresses of prmitive types (int) are by default
not tracked as doing so would end up tracking ALL the ints serialized
which is not what most people would expect.  if you want to do this
you'll have to wrap the int in a class so its type can be distuished
and it can then be tracked.  Then I believe that serializing a pointer
to your wrapped class will function as you hope and expect.

Robert Ramey

Ruediger Berlich wrote:
...
Hi there,
I am relatively new to Boost in general and serialization in
particular. Nevertheless, having spent the day trying to find out how
to serialize a shared_ptr, I feel it is time to search for some
external advice. So any help is appreciated!
Here is the (hopefully) simple program:
/************************************************************/
#include <typeinfo>
#include <fstream>
#include <iostream>
#include <sstream>
#include <vector>
#include 
#include 
#include 
#include 
#include 
#include 
#include 
// #include 
#include 
#include 
#include 
#include 
#include 
using namespace std;
using namespace boost;
using namespace boost::serialization;
class ptr{
   friend class boost::serialization::access;
template<class Archive>
   void serialize(Archive & ar, const unsigned int version){
       using boost::serialization::make_nvp;
       ar & make_nvp("p",p);
   }
shared_ptr<int> p;
public:
   ptr(){
       shared_ptr<int> dummy(new int(6));
       p = dummy;
   }
void printInfo(void){
       cout << "*(p.get()) = " << *(p.get()) << endl;
   }
};
main()
{
   ostringstream ofs;
ptr myp;
{
       boost::archive::xml_oarchive oa(ofs);
       oa << make_nvp("myp",myp);
   }
cout << ofs.str() << endl;
ptr newmyp;
{
       istringstream ifs;
       ifs.str(ofs.str());
       boost::archive::xml_iarchive ia(ifs);
       ia >> make_nvp("myp",newmyp);
   }
newmyp.printInfo();
return 0;
}
/************************************************************/
When I try to compile this (OpenSUSE 10.2, g++ 4.1.2, Boost 1.33.1),
I get a LONG list of error messages, of which I will only quote the
first few lines only:
/************************************************************/
$ g++ -o test14 -lboost_serialization test14.cc
/usr/include/boost/serialization/shared_ptr.hpp: In function 'void
boost::serialization::serialize(Archive&, boost::shared_ptr<U>&,
unsigned int) [with Archive = boost::archive::xml_iarchive, T = int]':
/usr/include/boost/serialization/serialization.hpp:140:   instantiated
from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned
int) [with Archive = boost::archive::xml_iarchive, T =
boost::shared_ptr<int>]'
/usr/include/boost/archive/detail/iserializer.hpp:160:   instantiated
from 'void boost::archive::detail::iserializer
...
...
...
load_object_data(boost::archive::detail::basic_iarchive&, void*,
unsigned int) const [with Archive = boost::archive::xml_iarchive, T =
boost::shared_ptr<int>]'
test14.cc:73:   instantiated from here
/usr/include/boost/serialization/shared_ptr.hpp:235: error: invalid
application of 'sizeof' to incomplete
type 'boost::STATIC_ASSERTION_FAILURE<false>'
[...]
/************************************************************/
The "STATIC_ASSERTION_FAILURE appears quite often in the error
messages.
BTW, the program runs nicely, if I include a simple int as "data
load" in this class (and modify the program to accept an int instead
of a shared_ptr, of course). I'm therefore confident that most of the
logic is just fine.
Any help is appreciated!
Best Regards,
Ruediger
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