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[BomBielFil <>]

Hi
I tried to use CGAL whit Boost Graph library but I've a problem when I modify the features of triangulation.
My code is:

typedef Is_finite<Triangulation> Filter;
typedef boost::filtered_graph<Triangulation,Filter,Filter> Finite_triangulation;
typedef boost::graph_traits<Finite_triangulation>::vertex_descriptor vertex_descriptor;
typedef boost::graph_traits<Finite_triangulation>::vertex_iterator vertex_iterator;
typedef boost::graph_traits<Finite_triangulation>::edge_descriptor edge_descriptor;
typedef boost::graph_traits<Finite_triangulation>::edge_iterator edge_iterator;

int main(int,char*[])
{
  Triangulation t;
  Filter is_finite(t);
  Finite_triangulation ft(t, is_finite, is_finite);  //graph

  t.insert(Point(0.4, 1));
  t.insert(Point(1, 0.3));
  t.insert(Point(0.0, -0.9));
  t.insert(Point(-1, 0));
  t.insert(Point(1, 2));

  boost::property_map<Triangulation,boost::edge_weight_t>::type weight_map=get(boost::edge_weight,ft);


  edge_iterator eit,eend;
for (boost::tie(eit,eend)=boost::edges(ft); eit!=eend; ++eit)
  {  
     std::cout << "PESO: " << get(weight_map,*eit) << "\n";
     put(weight_map,*eit ,100);
     std::cout << "PESO2: " << get(weight_map,*eit) << "\n";
  }
return 0;
}

at compile time the reply is: "property_map.hpp:319: error: invalid lvalue in assignment"
associated at "put" function.
Why "get" do right and put no?Can help me??

Best regards 
-Bombielfi-