The concept Vertex2FTPropertyMap specializes the concept of LvaluePropertyMap of the Boost library. It is intended to be used in combination with the concept TriangulatedSurfaceMesh in the class Ridge_approximation. It associates a field type value TriangulatedSurfaceMesh::Traits::FT to keys which are TriangulatedSurfaceMesh::Vertex_handle.
Vertex2Data_Property_Map_with_std_map::Vertex2FT_property_map,