Hi Volodya ----- Mensaje original ----- De: Vladimir Prus <ghost@cs.msu.su> Fecha: Viernes, Septiembre 15, 2006 6:19 pm Asunto: Re: [Boost-users] [serialization] serialization of pointers toprimitive types?

Joaquín Mª López Muñoz wrote:

...

The following test program:

#include <boost/archive/text_oarchive.hpp> #include <sstream>

int main() { int x=0; int* const px=&x; std::ostringstream oss; boost::archive::text_oarchive oa(oss); oa<<px;

return 0; } .... I've checked the same snippet against Boost 1.33.1, CVS HEAD and RC_1_34_0, using other primitive types like std::string, same problem always. Same problem also for the loading counterpart. When the pointed-to type is not primitive, though, everything works fine, regardless of whether the type has intrusive or non intrusive serialization support.

I am sure I'm doing something really stupid here, but I've been banging my head against this several hours. Some clue greatly appreciated.

This never worked, I think. The problem is that if you're saving pointers,you need to check if you've already saved that pointer, so that on loading, you don't get two pointers to to ints, as opposed to two pointers to a single int, as it should be.

This "tracking" requires runtime map, and I believe Robert decided thatmaintaining such map for primitive type can be too expensive. I'm not sure how valid that point it, not how many hidden stones there are in enablingprimitive types to be tracked.

I know primitive types are not tracked, but I take that to mean that multiple pointers to the same object will result in duplicated copies in the archive, *not* that serializing a pointer will result in a compile error. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo