Re: [Boost-users] Creating a property map inside Dijkstra Visitor

Jonas Gabriel wrote:

Good afternoon,

Inside a dijkstra visitor I would like to change the edge weights at some point, so in my visitor I'm trying to make a property map called weight :

...

template void examine_edge (Edge e, Graph& g) { typename property_map::type weight; weight=get(edge_weight, g);

The "Graph" you get will actually be a const Graph. So you should probably make the parameter to examine_edge a const Graph& and then either use the "const_type" of the property map: template void examine_edge (Edge e, const Graph& g) { typename property_map::const_type weight; weight=get(edge_weight, g); Or const_cast away the constness of the Graph, if you need to modify the weights: template void examine_edge (Edge e, const Graph& cg) { Graph& g = const_cast(cg); typename property_map::type weight; weight=get(edge_weight, g); - Doug