This is a known issue with C++ standard i/o. It is only related to serialization to the extent that serialization depends upon C++ standard i/o. This comes up on a regular basis. I'm considering trappnig attempts to serialize NaNs as errors - as I think they always are. But then I would have to document the trap and how to override it as opposed to adding to the document why this is not a serialization issue. Robert Ramey Arnstein Ressem wrote:

Hi,

I have run into a problem with the boost xml serialization of overflowing floats. On Linux these are being serialized as 'inf' into the xml files, but when reading the float back in it results in stream errors. I have searched the archives to find an answer to this, but without luck. The small program below has been compiled and run on 32-bit and 64-bit Linux (RedHat Enterprise Linux 4) with boost 1.33.1 and 1.34.1. In every case it results in a stream error and the float can not be read back in from the xml file.

Does anyone know if this is supposed to work ?

#include <fstream> #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp>

int main() { const char fname[] = "float.xml";

float f = 1.0e+20*1.0e+20;

{ std::ofstream ofs(fname); assert(ofs.good()); boost::archive::xml_oarchive oa(ofs); oa << BOOST_SERIALIZATION_NVP(f); }

{ std::ifstream ifs(fname); assert(ifs.good()); boost::archive::xml_iarchive ia(ifs); ia >> BOOST_SERIALIZATION_NVP(f); }

return 0; }

Best regards, Arnstein Ressem