Use `char face_orientation`.

diff --git a/include/deal.II/grid/reference_cell.h b/include/deal.II/grid/reference_cell.h
index 4aea94003a817e591cc07d815d0064966a5b8826..1b25b65c7293b562f9211d7520a3b267fb0adfad 100644 (file)
--- a/include/deal.II/grid/reference_cell.h
+++ b/include/deal.II/grid/reference_cell.h
@@ -320,22 +320,19 @@ public:
    * For three spatial dimensions, the exact order of the children is laid
    * down in the general documentation of this class.
    *
-   * The <tt>face_orientation</tt>, <tt>face_flip</tt> and
-   * <tt>face_rotation</tt> arguments are meant exclusively for quadrialaterals
-   * and hexahedra at the moment. They determine how this function handles faces
-   * oriented in the standard and non-standard orientation.
-   * <tt>face_orientation</tt> defaults to <tt>true</tt>, <tt>face_flip</tt> and
-   * <tt>face_rotation</tt> default to <tt>false</tt> (standard orientation) and
-   * has no effect in 2d. The concept of face orientations is explained in this
+   * The <tt>face_orientation</tt> argument is meant exclusively for
+   * quadrilaterals and hexahedra at the moment. It determines how this function
+   * handles faces oriented in the standard and non-standard orientation. It
+   * represents a bit-code for the overall <tt>face_orientation</tt>,
+   * <tt>face_flip</tt> and <tt>face_rotation</tt> and defaults to the standard
+   * orientation. The concept of face orientations is explained in this
    * @ref GlossFaceOrientation "glossary"
    * entry.
    */
   unsigned int
-  child_cell_on_face(const unsigned int face_n,
-                     const unsigned int subface_n,
-                     const bool         face_orientation = true,
-                     const bool         face_flip        = false,
-                     const bool         face_rotation    = false) const;
+  child_cell_on_face(const unsigned int  face_n,
+                     const unsigned int  subface_n,
+                     const unsigned char face_orientation = 1) const;
 
   /**
    * For a given vertex in a cell, return a pair of a face index and a
@@ -942,11 +939,10 @@ ReferenceCell::face_reference_cell(const unsigned int face_no) const
 
 
 inline unsigned int
-ReferenceCell::child_cell_on_face(const unsigned int face,
-                                  const unsigned int subface,
-                                  const bool         face_orientation,
-                                  const bool         face_flip,
-                                  const bool         face_rotation) const
+ReferenceCell::child_cell_on_face(
+  const unsigned int  face,
+  const unsigned int  subface,
+  const unsigned char face_orientation_raw) const
 {
   AssertIndexRange(face, n_faces());
 
@@ -967,6 +963,10 @@ ReferenceCell::child_cell_on_face(const unsigned int face,
     }
   else if (*this == ReferenceCells::Quadrilateral)
     {
+      const bool face_orientation = Utilities::get_bit(face_orientation_raw, 0);
+      const bool face_flip        = Utilities::get_bit(face_orientation_raw, 2);
+      const bool face_rotation    = Utilities::get_bit(face_orientation_raw, 1);
+
       return GeometryInfo<2>::child_cell_on_face(
         RefinementCase<2>(RefinementPossibilities<2>::no_refinement),
         face,
@@ -989,6 +989,10 @@ ReferenceCell::child_cell_on_face(const unsigned int face,
     }
   else if (*this == ReferenceCells::Hexahedron)
     {
+      const bool face_orientation = Utilities::get_bit(face_orientation_raw, 0);
+      const bool face_flip        = Utilities::get_bit(face_orientation_raw, 2);
+      const bool face_rotation    = Utilities::get_bit(face_orientation_raw, 1);
+
       return GeometryInfo<3>::child_cell_on_face(
         RefinementCase<3>(RefinementPossibilities<3>::no_refinement),
         face,