This was my error typedef typename property_map < Graph, edge_Weight_t >::type EdgeWeightMap; EdgeWeightMap eWeight_map, eWeightCopy_map; I needed separate types for each map as below. typedef typename property_map < Graph, edge_Weight_t >::type EdgeWeightMap; EdgeWeightMap eWeight_map; typedef typename property_map < Graph, edge_WeightCopy_t >::type EdgeWeightCopyMap; EdgeWeightCopyMap eWeightCopy_map; AStorm gave me the answer on the boost IRC chat. I don't know if I would have ever figured it out for myself, It seems a little tricky for noobies. Thanks -Caligula --- On Wed, 8/12/09, Andrew Sutton <andrew.n.sutton@gmail.com> wrote: From: Andrew Sutton <andrew.n.sutton@gmail.com> Subject: Re: [Boost-users] [BGL] Can't correctly copy data To: boost-users@lists.boost.org Date: Wednesday, August 12, 2009, 4:23 AM There may be something going on with the properties. Does the problem persist if you use bundled properties? http://www.boost.org/doc/libs/1_39_0/libs/graph/doc/bundles.html Andrew Sutton andrew.n.sutton@gmail.com -----Inline Attachment Follows----- _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users