Re: [boost] [graph] Archetype's redundant members (Re: [graph]Direct Edge Access)

Hi Jeremiah, On Wed, Mar 13, 2013 at 9:35 PM, Takatoshi Kondo wrote:

Hi Jeremiah,

Thanks for your advice. I studied about archetypes. If I understood the minimal archetype requirements based on concepts correctly, some graph archetypes seems to have redundant members. In addition, vertex_list_graph_archetype::degree_size_type should inherit from incidence_graph_archetype.

Now, I understand that AdjacencyGraph Concept doesn't provide out_degree(v, g). I removed it from adjacency_graph_archetype. Also I removed degree_size_type. As the result of that, ambiguity of the vertex_list_graph has been solved. I updated my patch.

So, I wrote a patch. After applying the patch, all Boost.Graph tests passed. Could you check the patch?

-- Takatoshi Kondo

On Thu, Mar 7, 2013 at 4:41 PM, Jeremiah Willcock wrote:

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On Thu, 7 Mar 2013, Takatoshi Kondo wrote:

...

Hi Jeremiah,

Thank you for your reply. I'm relieved that I understand correctly. I come up with a related question. I think that general graph algorithm developers should test two different things.

One is concepts. If function my_algo() required VertexAndEdgeListGraphConcept for the parameter g, it should be checked as follows:

#include

template <typename Graph> void my_algo(Graph g) { BOOST_CONCEPT_ASSERT(( boost::VertexAndEdgeListGraphConcept<Graph> ));

boost::edge(0, 1, g); // accidental invalid use ... Line A }

But this test cannot detect out of concepts functions usage as Line A if class Graph accidentally provide them. So, these problems should be detected the following test:

void my_algo_test() { typedef /* Only satisfies VertexAndListGraphConcept*/ Graph; // ... Line B Graph g; my_algo(g); }

How do I define the type that is only satisfied specific concepts?

Those are called "archetypes" in the terminology of the Boost Concept Check Library (http://www.boost.org/doc/libs/1_53_0/libs/concept_check/concept_check.htm). There is a set of them for Boost.Graph concepts in . They do not appear to have documentation, but example uses include most files with the name pattern *_cc.cpp in libs/graph/test (e.g., bfs_cc.cpp).

-- Jeremiah Willcock

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-- Takatoshi Kondo