From 4525eeb988d23c0e81831b6cd4564a664e0c8aed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Loriot?= <sebastien.loriot@cgal.org>
Date: Thu, 25 Apr 2024 19:29:48 +0200
Subject: [PATCH] do not modify the map if not the default one

---
 .../CGAL/Polygon_mesh_processing/remesh_planar_patches.h      | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/remesh_planar_patches.h b/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/remesh_planar_patches.h
index 7d41f28d5b7d..71e49fcbffa0 100644
--- a/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/remesh_planar_patches.h
+++ b/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/remesh_planar_patches.h
@@ -1430,6 +1430,7 @@ void remesh_planar_patches(const TriangleMeshIn& tm_in,
   typedef typename GetVertexPointMap <TriangleMeshIn, NamedParametersOut>::type VPM_out;
   using parameters::choose_parameter;
   using parameters::get_parameter;
+  using parameters::is_default_parameter;
 
   typedef typename boost::graph_traits<TriangleMeshIn> graph_traits;
   typedef typename graph_traits::edge_descriptor edge_descriptor;
@@ -1465,7 +1466,8 @@ void remesh_planar_patches(const TriangleMeshIn& tm_in,
     face_cc_ids = choose_parameter<Default_FCM>(get_parameter(np_in, internal_np::face_patch),
                                                 dynamic_face_property_t<std::size_t>(), tm_in);
 
-  for(edge_descriptor e : edges(tm_in)) put(edge_is_constrained, e, false);
+  if (is_default_parameter<NamedParametersIn, internal_np::edge_is_constrained_t>::value)
+    for(edge_descriptor e : edges(tm_in)) put(edge_is_constrained, e, false);
   for(vertex_descriptor v : vertices(tm_in)) put(vertex_corner_id, v, Planar_segmentation::default_id());
   for(face_descriptor f : faces(tm_in)) put(face_cc_ids, f, -1);