I'm interested in using the portable binary serialization code in [serialization]/example directory with Boost.Uuid. I've noticed that there's a fall back template function for unrecognized types in portable_binary_iarchive.hpp: 101 // default fall through for any types not specified here 102 template<class T> 103 void load(T & t){ 104 boost::intmax_t l; 105 load_impl(l, sizeof(T)); 106 // use cast to avoid compile time warning 107 t = static_cast<T>(l); 108 } that relies on the sizeof operator. Short of replacing the sizeof operator with a templated switch: //Code Sample 1 //Start code template <typename T> std::size_t my_size_of { return sizeof(T); } tempate <> std::size_t my_size_ofboost::uuids::uuid { return boost::uuids::uuid::static_size(); } //End code or using macros ala: //CodeSample 2 //Start template <typename T> std::size_t my_size_of(T const & t) { return sizeof(T); } tempate <> std::size_t my_size_ofboost::uuids::uuid(boost::uuids::uuid const &) { return boost::uuids::uuid::static_size(); } #define sizeof(x) my_size_of(x) #include #undef sizeof //End , is their something less instrusive I could do to make it work with Boost.Uuid? Thanks, Mostafa