I have the following graph: typedef property< vertex_index_t, uint32_t, property< vertex_name_t, boost::shared_ptr<Component> > > VertexProperty; typedef adjacency_list // VertexProperties Graph_Type; When I looked at the documentation I did not see an example which used a boost::shared_ptr to store information at the vertex. Here is my attempt at writing a PropertyWriter. I cannot figure out how to write the 2nd function argument type: class Component_Writer { public: void operator()(std::ostream& out, const boost::shared_ptr<Component> obj) const { out << "[label=\"" << obj_ptr->get_Name() << "\n" << obj_ptr->get_ID() << "\"]"; } }; The error I get is: cd /home/storri/src/libreverse/src/infrastructure/ g++ -g -Wall -o graph_test2 graph_test2.cpp /usr/include/boost/graph/graphviz.hpp: In function `void boost::write_graphviz(std::ostream&, const Graph&, VertexPropertiesWriter, EdgePropertiesWriter, GraphPropertiesWriter) [with Graph = boost::adjacency_list >, boost::no_property, boost::no_property, boost::listS>, VertexPropertiesWriter = Component_Writer, EdgePropertiesWriter = boost::default_writer, GraphPropertiesWriter = boost::default_writer]': /usr/include/boost/graph/graphviz.hpp:292: instantiated from `void boost::write_graphviz(std::ostream&, const Graph&, VertexWriter) [with Graph = boost::adjacency_list >, boost::no_property, boost::no_property, boost::listS>, VertexWriter = Component_Writer]' graph_test2.cpp:484: instantiated from here /usr/include/boost/graph/graphviz.hpp:264: error: no match for call to `( Component_Writer) (std::basic_ostream

&, void* const&)' graph_test2.cpp:49: error: candidates are: void Component_Writer::operator()(std::ostream&, const boost::shared_ptr<Component>&) const

Compilation exited abnormally with code 1 at Mon Nov 8 00:15:3 Stephen -- Email: storri@torri.org