#include <cassert>
#include <iostream>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graphviz.hpp>
#include <boost/graph/graph_utility.hpp>

using namespace boost;

typedef adjacency_list<vecS, vecS, directedS, property<vertex_name_t, std::string> > graph_t;

int main()
{
 std::ifstream ifs("a.dot");
 assert(ifs.good());
 dynamic_properties p;
 graph_t g;
 p.property("id", get(vertex_name, g));
 read_graphviz(ifs, g, p, "id");
 assert(num_vertices(g) == 2);
 print_graph(g, get(vertex_name, g));
 write_graphviz(std::cout, g, p, std::string("id"));
 return 0;
}