Hello, For Windows7 VC10 64 bit, boost_1_43_0 the following code produces an error message #include <tuple> #include <boost/graph/adjacency_list.hpp> typedef boost::adjacency_list< boost::vecS, boost::vecS, boost::undirectedS > G; int main() { G g1; G g2(g1); return 0; } C:\boost\boost_1_43_0\boost/graph/detail/adjacency_list.hpp(2157) : error C2668: 'boost::tuples::tie' : ambiguous call to overloaded function C:\boost\boost_1_43_0\boost/tuple/detail/tuple_basic.hpp(889): could be 'boost::tuples::tuple<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> boost::tuples::tie<boost::detail::undirected_edge_iter<EdgeIter,EdgeDescriptor,Difference>,boost::detail::undirected_edge_iter<EdgeIter,EdgeDescriptor,Difference>>(boost::detail::undirected_edge_iter<EdgeIter,EdgeDescriptor,Difference> &,boost::detail::undirected_edge_iter<EdgeIter,EdgeDescriptor,Difference> &)' .... OR C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\xxtuple1(34): or 'std::tr1::tuple<_Arg0,_Arg1,_Arg2,_Arg3,_Arg4,_Arg5,_Arg6,_Arg7,_Arg8,_Arg9> std::tr1::tie<boost::detail::undirected_edge_iter<EdgeIter,EdgeDescriptor,Difference>,boost::detail::undirected_edge_iter<EdgeIter,EdgeDescriptor,Difference>>(boost::detail::undirected_edge_iter<EdgeIter,EdgeDescriptor,Difference> &,boost::detail::undirected_edge_iter<EdgeIter,EdgeDescriptor,Difference> &)' [found using argument-dependent lookup] Best regards, andreas fabri