Hello, Trying to write an BGL adaption of a BGL foreign graph-class I followed the conversion guide: "http://www.boost.org/doc/libs/1_39_0/libs/graph/doc//leda_conversion.html" Using "boost::function_requires();" in order to check my implemetation gcc complains about: "boost/graph/graph_concepts.hpp:199: error: no matching function for call to 'vertices(const MyGraph&)'" I further noticed that the test-case "stanford_graph_cc.cpp" found in "BOOST/libs/graph/test" also fails with this error. Any help would be much appreciated! greetings, Chris