Periodic_3 remove traits must overwrite construct_point_3()

Periodic_3_triangulation_3/include/CGAL/internal/Periodic_3_triangulation_remove_traits_3.h

@@ -30,6 +30,21 @@
 
 namespace CGAL { 
 
+// Triangulation_3 has calls to Construct_point_3 to handle weighted and bare points.
+// The default inherited Construct_point_3 inherited by Periodic_3_triangulation_remove_traits_3
+// must be overwritten by a construction Construct_point_3 that offers:
+// - pair<K::Point_3, offset> --> pair<K::Point_3, offset> (identity)
+// - pair<K::Weighted_point_3, offset> --> pair<K::Point_3, offset> (will be added when needed)
+template < class Traits_ >
+class Construct_point_3_remove_traits
+{
+  typedef Traits_                        Traits;
+  typedef typename Traits::Point_3       Point_3; // actually a pair <K::Point_3, offset>
+
+public:
+  const Point_3& operator()(const Point_3& p) { return p; }
+};
+
 template < class Traits_, class Functor_ >
 class Point_offset_adaptor {
   typedef Traits_ Traits;
@@ -86,6 +101,9 @@ public:
     _pt.set_domain(domain);
   }
 
+  // Construct point
+  typedef Construct_point_3_remove_traits<Self> Construct_point_3;
+
   // Triangulation traits
   typedef Point_offset_adaptor<Self, typename PT::Compare_xyz_3>
       Compare_xyz_3;
@@ -104,6 +122,11 @@ public:
       Compare_distance_3;
 
   // Operations
+  Construct_point_3
+  construct_point_3_object() const {
+    return Construct_point_3();
+  }
+
   Compare_xyz_3
   compare_xyz_3_object() const {
     return Compare_xyz_3(_pt.compare_xyz_3_object());