Hi Chris, On Sun, 15 Sep 2002, Chris Russell wrote: cdr> What determines when boost::get(Graph, vertex_myproperty_t) returns a cdr> boost::property_map<graph_t, vertex_myproperty>::type vs. a cdr> ::const_type? The constness of the graph object that is passed to get(). cdr> vertex_myproperty_map_t MyMap = get(vertex_myproperty, Graph); cdr> cdr> ^--- this works as I expected. However, if I try to get a copy of my cdr> property map this way inside a dfs visitor method, my compiler tells cdr> me that cdr> there's no suitable conversion from property_map<graph_t, cdr> vertex_myproperty_t>::const_type to property_map<graph_t, cdr> vertex_myproperty_t>::type (IA32 6.0 Intel compiler). You've got a const graph object inside the visitor, so you need to use the const property map. Cheers, Jeremy ---------------------------------------------------------------------- Jeremy Siek http://php.indiana.edu/~jsiek/ Ph.D. Student, Indiana Univ. B'ton email: jsiek@osl.iu.edu C++ Booster (http://www.boost.org) office phone: (812) 855-3608 ----------------------------------------------------------------------