Hi, I am trying to use the BGL to model a simple directed graph with internal edge properties. Following the example given in the documentation[1], I have done the following (with question-irrelevant padding removed): ------------------------------- #include <boost/graph/adjacency_list.hpp> #include <boost/property_map.hpp> typedef boost::property<boost::edge_weight_t, double> EdgeProperties; typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::no_property, EdgeProperties> NetworkGraph; typedef std::pair<int, int> Edge; NetworkGraph g(5); boost::add_edge(0, 1, g); boost::add_edge(0, 2, g); boost::add_edge(1, 3, g); boost::add_edge(2, 3, g); boost::add_edge(3, 4, g); boost::property_map<NetworkGraph, boost::edge_weight_t>::type weights = boost::get(boost::edge_weight_t(), g); weights[0] = 1.0; weights[1] = 1.0; weights[2] = 1.0; weights[3] = 1.0; weights[4] = 1.0; ------------------------------- Which all looks fairly kosher. However, attempting to compile this results in a error on each of the weights assignment lines: "error: no match for 'operator[]' in 'weights[0]' Using the syntax boost::put(weights, 0, 1.0) just moves this error inside a parameter_set template definition. Can anybody shed any light on this? For the record this is on MacOS X 10.5.1, with GCC 4.0.1 (i686-apple-darwin9-gcc-4.0.1). Regards, James Jackson. [1] interior_property_map.cpp