In attempting to test serialization input for the proposed Boost Units library, I am getting this error : /Users/matthiasschabel/Code/boost-CVS-HEAD-07-02-21-1603/boost/ archive/detail/iserializer.hpp:589: error: no matching function for call to 'load_wrapper(boost::archive::binary_iarchive&, const double&, boost::serialization::is_wrapper<double>)' corresponding to this code : std::ifstream ifs ("boost_units_serialize_test.txt",std::ios::binary); boost::archive::binary_iarchive bia(ifs); for (int i=0;i<100;++i) { quantity<CGS::area> ac; bia >> ac; } ifs.close(); where I have defined /// Boost Serialization library support for quantities. template<class Archive,class Unit,class Y> inline void serialize(Archive& ar,boost::units::quantity<Unit,Y>& q,const unsigned int version) { ar & q.value(); } Am I missing something obvious here? I get basically the same error if I try using text_iarchive instead... Matthias