Hi there, in the process of recompiling my project with boost 1.34. it seems that tuple_size doesn't work for long tuples anymore. The following code used to work: #define FUSION_MAX_MAP_SIZE 20 #define FUSION_MAX_VECTOR_SIZE 20 #include <boost/fusion/sequence.hpp> #include <boost/fusion/tuple.hpp> struct A { typedef boost::fusion::vector< int , int , int , int , int , int , int , int , int , int , int , int > type; static const std::size_t table_size = boost::fusion::tuple_size<type>::value; }; int main() { return 0; } The code does compile when the number of parameters is 10 or less. Any ideas? Christian