[Boost-users] Vector types in dynamic_properties used by write_graphml

31 May 2009

      He Folks,

I'm using bundled properties in order to attach multiple attributes
to graph nodes. Using only basic data types like integers, strings
etc. the following example code works well. However I would like
to also use vectors or similar containers (like in the example about
bundled properties at 
http://www.boost.org/doc/libs/1_39_0/libs/graph/doc/bundles.html).

However I don't know how to use this field for my dynamic_property map.
In the following code the single commented-out line is the point where
I most probably didn't understand some kind of vital concept.

Maybe you could enlighten me or at least point me in the right direction,
thanks in advance

Richard Vock
---

Here's the example code:
#include <iostream>
#include <boost/graph/adjacency_list.hpp>
#include <boost/dynamic_property_map.hpp>
#include <boost/graph/graphml.hpp>

struct NodeProperties {
	int test;
	std::vector<int>	ints;
};

int main(int argc, char* argv[]) {
	typedef std::pair<int,int> Edge;
	std::vector< Edge > connections;

	// create simple edge loop for testing purposes
	for (int i=0; i<10; ++i) 
		connections.push_back( Edge(i,(i+1)%10) );

	typedef boost::adjacency_list< boost::vecS, boost::vecS, boost::undirectedS, 
NodeProperties> Graph;
	Graph g(connections.begin(), connections.end(), 10);

	boost::graph_traits<Graph>::vertex_iterator v, v_end;
	for (tie(v,v_end) = vertices(g); v != v_end; ++v) {
		Graph::vertex_descriptor desc = *v;
		g[desc].test = 10;
		for (int i=0; i<5; ++i) g[desc].ints.push_back(i);
	}

	boost::dynamic_properties dp;
	dp.property("test",  get(&NodeProperties::test, g));
	//dp.property("testInts",  get(&NodeProperties::ints, g));

	boost::write_graphml(std::cout, g, dp, true);
}