Hello All! In my unit tests i use Graph, Test and Assign libraries (boost 1.39, MSVC 2005). This is an example to reproduce warning: #include #include #include #include <vector> //#include int main() { typedef boost::adjacency_list G; typedef boost::graph_traits<G>::vertex_descriptor V; typedef std::map Map; G g; std::vector<V> sorted; Map m; boost::add_vertex(g); boost::topological_sort(g, std::back_inserter(sorted), color_map(boost::make_assoc_property_map(m))); //boost::assign::list_of<V>(0); return 0; } I noticed that when i uncomment both `#include ` and `boost::assign::list_of<V>(0);` the warning occur: boost\graph\depth_first_search.hpp(200) : warning C4267: 'argument' : conversion from 'size_t' to 'unsigned int', possible loss of data if one of the string is absent there is no warning. Any thoughts? -- Regards, Andrey