Hi I am using wide xml boost serialization archive. Because of the problem with loading of nans and infinities I tried the nonfinite facet as in the code snippet. This works, expect it messes with the encoding of the xml arhive which is no longer UTF-8 like before the using the facet, and I believe it is because of the no_codecvt flag which is passed to the archive. But without this flag the loading of nans/infinity does not work. How to use the facet and keep the wanted UTF-8 encoding ? float d = std::numeric_limits<float>::quiet_NaN; { std::wofstream oss("C:\\test.xml"); std::locale locale1(oss.getloc(), new boost::math::nonfinite_num_put<wchar_t>); oss.imbue(locale1); xml_woarchive oar(oss, no_codecvt); oar << BOOST_SERIALIZATION_NVP(d); } { float d; std::wifstream iss("C:\\test.xml"); std::locale locale1(iss.getloc(), new boost::math::nonfinite_num_get<wchar_t>); iss.imbue(locale1); xml_wiarchive iar(iss, no_codecvt); iar >> BOOST_SERIALIZATION_NVP(d); std::cout << d << std::endl; } -- View this message in context: http://boost.2283326.n4.nabble.com/serialization-Nans-and-infinity-in-wide-x... Sent from the Boost - Users mailing list archive at Nabble.com.