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c++boostadjacency-listprinter-control-language

Is there a simple way to find out if a boost::adjacency_list is empty?

I'm using a LCCP from the Point Cloud Library, but I'm quite that I'm doing something wrong. I think I narrowed the Error down and it has something to do with the SuperVoxelAdjacencyList sv_adjacency_list; lccp.getSVAdjacencyList (sv_adjacency_list);

because I've implemented a other way to get the adjacency. The documentation states that

[out] adjacency_list_arg The supervoxel adjacency list with classified (convex/concave) edges. On error the list is empty.

So now I'm wondering if there is a way find out if the list is emtpy. Every help is appreciated.

Solution

  • I'd say if boost::num_vertices(sv_adjacency_list) == 0 you can conclude it's empty.

    Of course, you could look at the number of edges instead.

    See also: http://www.boost.org/doc/libs/1_61_0/libs/graph/doc/graph_concepts.html