Hi Aaron, thank for your reply I use boost whit CGAL library and in the first line of my code I've a template "Is_finite": typedef CGAL::Exact_predicates_inexact_constructions_kernel K; typedef CGAL::Arr_segment_traits_2<K> Segment_traits_2; typedef CGAL::Arr_polyline_traits_2 Traits_2; typedef K::Point_2 Point; typedef K::Segment_2 Segment; typedef Traits_2::Curve_2 Polyline; typedef CGAL::Triangulation_vertex_base_with_id_2<K> Tvb; typedef CGAL::Triangulation_face_base_2<K> Tfb; typedef CGAL::Triangulation_data_structure_2 Tds; typedef CGAL::Delaunay_triangulation_2 Triangulation; // consider finite vertices and edges. template <typename T> struct Is_finite { const T* t_; Is_finite() : t_(NULL) {} Is_finite(const T& t) : t_(&t) { } template <typename VertexOrEdge> bool operator()(const VertexOrEdge& voe) const { return ! t_->is_infinite(voe); } }; Best Regards -Bombielfil- 2008/2/6, Aaron Windsor :

On Feb 6, 2008 7:02 AM, BomBielFil wrote:

...

Hi I've a problem whit "put" function. My simple code is: -------------------------- typedef Is_finite<Triangulation> Filter; typedef boost::filtered_graph Finite_triangulation; typedef boost::graph_traits::vertex_descriptor vertex_descriptor; typedef boost::graph_traits::vertex_iterator vertex_iterator; typedef boost::graph_traits::edge_descriptor edge_descriptor; typedef boost::graph_traits::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::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 I've: "/property_map.hpp:319: error: invalid lvalue in assignment" Why get is right and put no??Can help me??

Hi,

What is your typedef for Triangulation? And what is the definition of Is_finite? I'd like to try to recreate this so I can see what's wrong.

Regards, Aaron _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users