From a0c1fcd38c83a61c793b837b3d8b55beee7cdabb Mon Sep 17 00:00:00 2001
From: Jean-Paul Pelteret <jppelteret@gmail.com>
Date: Fri, 31 Dec 2021 21:38:48 +0100
Subject: [PATCH] Extend ScratchData's public interface with getter methods to
 access private data

---
 .../changes/minor/20211231Jean-PaulPelteret   |  5 ++
 include/deal.II/meshworker/scratch_data.h     | 42 +++++++++++++
 source/meshworker/scratch_data.cc             | 63 +++++++++++++++++++
 3 files changed, 110 insertions(+)
 create mode 100644 doc/news/changes/minor/20211231Jean-PaulPelteret

diff --git a/doc/news/changes/minor/20211231Jean-PaulPelteret b/doc/news/changes/minor/20211231Jean-PaulPelteret
new file mode 100644
index 0000000000..d514710d56
--- /dev/null
+++ b/doc/news/changes/minor/20211231Jean-PaulPelteret
@@ -0,0 +1,5 @@
+New: More "getter" functions have been added to MeshWorker::ScratchData,
+facilitating the construction of other FEValues-type objects with some of 
+the same objects as those used in a ScratchData instance.
+<br>
+(Jean-Paul Pelteret, 2021/12/31)
diff --git a/include/deal.II/meshworker/scratch_data.h b/include/deal.II/meshworker/scratch_data.h
index 43a1726b75..261c4df13b 100644
--- a/include/deal.II/meshworker/scratch_data.h
+++ b/include/deal.II/meshworker/scratch_data.h
@@ -532,6 +532,48 @@ namespace MeshWorker
     const Mapping<dim, spacedim> &
     get_mapping() const;
 
+    /**
+     * Return a reference to the selected finite element object.
+     */
+    const FiniteElement<dim, spacedim> &
+    get_fe() const;
+
+    /**
+     * Return a reference to the cell quadrature object in use.
+     */
+    const Quadrature<dim> &
+    get_cell_quadrature() const;
+
+    /**
+     * Return a reference to the face quadrature object in use.
+     */
+    const Quadrature<dim - 1> &
+    get_face_quadrature() const;
+
+    /**
+     * Return the cell update flags set.
+     */
+    UpdateFlags
+    get_cell_update_flags() const;
+
+    /**
+     * Return the neighbor cell update flags set.
+     */
+    UpdateFlags
+    get_neighbor_cell_update_flags() const;
+
+    /**
+     * Return the face update flags set.
+     */
+    UpdateFlags
+    get_face_update_flags() const;
+
+    /**
+     * Return the neighbor face update flags set.
+     */
+    UpdateFlags
+    get_neighbor_face_update_flags() const;
+
     /**
      * @name Evaluation of finite element fields and their derivatives on the current cell
      */
diff --git a/source/meshworker/scratch_data.cc b/source/meshworker/scratch_data.cc
index b5cf1e7ed2..d8844ad2b8 100644
--- a/source/meshworker/scratch_data.cc
+++ b/source/meshworker/scratch_data.cc
@@ -403,6 +403,69 @@ namespace MeshWorker
     return *mapping;
   }
 
+
+
+  template <int dim, int spacedim>
+  const FiniteElement<dim, spacedim> &
+  ScratchData<dim, spacedim>::get_fe() const
+  {
+    return *fe;
+  }
+
+
+
+  template <int dim, int spacedim>
+  const Quadrature<dim> &
+  ScratchData<dim, spacedim>::get_cell_quadrature() const
+  {
+    return cell_quadrature;
+  }
+
+
+
+  template <int dim, int spacedim>
+  const Quadrature<dim - 1> &
+  ScratchData<dim, spacedim>::get_face_quadrature() const
+  {
+    return face_quadrature;
+  }
+
+
+
+  template <int dim, int spacedim>
+  UpdateFlags
+  ScratchData<dim, spacedim>::get_cell_update_flags() const
+  {
+    return cell_update_flags;
+  }
+
+
+
+  template <int dim, int spacedim>
+  UpdateFlags
+  ScratchData<dim, spacedim>::get_neighbor_cell_update_flags() const
+  {
+    return neighbor_cell_update_flags;
+  }
+
+
+
+  template <int dim, int spacedim>
+  UpdateFlags
+  ScratchData<dim, spacedim>::get_face_update_flags() const
+  {
+    return face_update_flags;
+  }
+
+
+
+  template <int dim, int spacedim>
+  UpdateFlags
+  ScratchData<dim, spacedim>::get_neighbor_face_update_flags() const
+  {
+    return neighbor_face_update_flags;
+  }
+
 } // namespace MeshWorker
 DEAL_II_NAMESPACE_CLOSE
 
-- 
2.39.5