gistfile1.txt

#include <iostream>

#include <boost/graph/graph_traits.hpp>
#include <boost/graph/adjacency_list.hpp>
 
typedef boost::property<boost::edge_weight_t, double> EdgeWeightProperty;
 
/*
adjacency_list<OutEdgeList, VertexList, Directed,
               VertexProperties, EdgeProperties,
               GraphProperties, EdgeList>
*/             
typedef boost::adjacency_list<boost::setS, boost::vecS, boost::undirectedS, boost::no_property, EdgeWeightProperty> Graph;
 
int main(int,char*[])
{
  // Create a graph object
  Graph g(3);

  std::cout << num_edges(g) << std::endl; // outputs 0
 
  EdgeWeightProperty e1 = 5;
  add_edge(0, 1, e1, g);
 
  std::cout << num_edges(g) << std::endl; // outputs 1

  EdgeWeightProperty e2 = 3;
  add_edge(1, 2, e2, g);
 
  std::cout << num_edges(g) << std::endl; // outputs 2

  EdgeWeightProperty e2b = 3;
  add_edge(1, 2, e2b, g);

  std::cout << num_edges(g) << std::endl; // outputs 2

  EdgeWeightProperty e2c = 3;
  add_edge(2, 1, e2c, g);

  std::cout << num_edges(g) << std::endl; // outputs 2

  return 0;
}