From 58246c436804c40245d44e85eb51b819c0c50b53 Mon Sep 17 00:00:00 2001
From: peterrum <peterrmuench@gmail.com>
Date: Wed, 14 Aug 2019 04:20:17 +0200
Subject: [PATCH] Modify the definition of CellId

Conflicts:
	include/deal.II/grid/tria.h
---
 doc/news/changes/minor/20190813PeterMunch | 4 ++++
 include/deal.II/grid/tria.h               | 2 +-
 source/grid/cell_id.cc                    | 5 ++---
 source/grid/tria_accessor.cc              | 4 +++-
 4 files changed, 10 insertions(+), 5 deletions(-)
 create mode 100644 doc/news/changes/minor/20190813PeterMunch

diff --git a/doc/news/changes/minor/20190813PeterMunch b/doc/news/changes/minor/20190813PeterMunch
new file mode 100644
index 0000000000..85229cdd54
--- /dev/null
+++ b/doc/news/changes/minor/20190813PeterMunch
@@ -0,0 +1,4 @@
+New: The definition of CellID has been modified so that it depends on the 
+unique coarse-cell id and no longer on the coarse-cell index.
+<br>
+(Peter Munch, 2019/08/13)
diff --git a/include/deal.II/grid/tria.h b/include/deal.II/grid/tria.h
index 65826ba89a..0c140e52ce 100644
--- a/include/deal.II/grid/tria.h
+++ b/include/deal.II/grid/tria.h
@@ -3502,7 +3502,7 @@ public:
    * Translate the index of coarse cell to its unique id.
    *
    * @note: See the note of the method
-   * translate_coarse_cell_id_to_coarse_cell_index().
+   * coarse_cell_id_to_coarse_cell_index().
    *
    * @param coarse_cell_index Index of the coarse cell.
    * @return Id of the coarse cell.
diff --git a/source/grid/cell_id.cc b/source/grid/cell_id.cc
index ff5c3d5548..28c4b8206c 100644
--- a/source/grid/cell_id.cc
+++ b/source/grid/cell_id.cc
@@ -158,9 +158,8 @@ template <int dim, int spacedim>
 typename Triangulation<dim, spacedim>::cell_iterator
 CellId::to_cell(const Triangulation<dim, spacedim> &tria) const
 {
-  typename Triangulation<dim, spacedim>::cell_iterator cell(&tria,
-                                                            0,
-                                                            coarse_cell_id);
+  typename Triangulation<dim, spacedim>::cell_iterator cell(
+    &tria, 0, tria.coarse_cell_id_to_coarse_cell_index(coarse_cell_id));
 
   for (unsigned int i = 0; i < n_child_indices; ++i)
     cell = cell->child(static_cast<unsigned int>(child_indices[i]));
diff --git a/source/grid/tria_accessor.cc b/source/grid/tria_accessor.cc
index 80579e6e84..290917877c 100644
--- a/source/grid/tria_accessor.cc
+++ b/source/grid/tria_accessor.cc
@@ -2179,7 +2179,9 @@ CellAccessor<dim, spacedim>::id() const
   Assert(ptr.level() == 0, ExcInternalError());
   const unsigned int coarse_index = ptr.index();
 
-  return {coarse_index, n_child_indices, id.data()};
+  return {this->tria->coarse_cell_index_to_coarse_cell_id(coarse_index),
+          n_child_indices,
+          id.data()};
 }
 
 
-- 
2.39.5