thanks Doug. Also something that bugs me is that: typedef adjacency_list<...> G; G g; const G& cg = g; G f; boost::copy_graph(boost::make_filtered_graph(cg, ...), f); copy_graph() doesn't work if make_filtered_graph() is called with a const graph. boost::copy_graph(boost::make_filtered_graph(g, ...), f); works fine. gcc gives an error during casting to (const G&) in the get() function for filtered_graph<> (filtered_graph.hpp line 440). I'm not sure why is so, but definitely should work with a const Graph. Can you check this? thanks, --vjs Douglas Gregor wrote:

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On Tue, 2006-11-28 at 10:34 +0000, Vladimir Sykora wrote:

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Can anyone correct the make_filtered_graph() function on boost/graph/filtered_graph.hpp to accept a const Graph& ?

So, you can pass a temporary to make_filtered_graph? Yeah, that should work. I'll add an overload.

The intent of the current approach is to keep the cv-qualification of the graph that's passed in.

adjacency_list<...> g;

foo(make_filtered_graph(g, ...)); // filtered_graph of non-const g

const adjacency_list<...>& gc = g; foo(make_filtered_graph(gc, ...)); // filtered_graph of const g

Cheers, Doug