From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Wed, 29 Dec 2021 16:36:41 +0000 (-0700)
Subject: Provide an overload for TriaAccess<0,1,spacedim>::copy_from().
X-Git-Tag: v9.4.0-rc1~649^2~2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5878babacb38ba51894fe907bec5e0c47e4f17d2;p=dealii.git

Provide an overload for TriaAccess<0,1,spacedim>::copy_from().
---

diff --git a/include/deal.II/grid/tria_accessor.h b/include/deal.II/grid/tria_accessor.h
index a095c8f36b..c6f9ff01e4 100644
--- a/include/deal.II/grid/tria_accessor.h
+++ b/include/deal.II/grid/tria_accessor.h
@@ -2384,6 +2384,14 @@ public:
   void
   copy_from(const TriaAccessor &);
 
+  /**
+   * Copy operator. We need this function to support generic
+   * programming, but it just throws an exception because it cannot do
+   * the required operations.
+   */
+  void
+  copy_from(const TriaAccessorBase<0, 1, spacedim> &);
+
   /**
    * Return the state of the iterator. Since an iterator to points can not be
    * incremented or decremented, its state remains constant, and in particular
diff --git a/include/deal.II/grid/tria_accessor.templates.h b/include/deal.II/grid/tria_accessor.templates.h
index 70ad55af02..c93e2713ee 100644
--- a/include/deal.II/grid/tria_accessor.templates.h
+++ b/include/deal.II/grid/tria_accessor.templates.h
@@ -2769,6 +2769,19 @@ TriaAccessor<0, 1, spacedim>::copy_from(const TriaAccessor &t)
 
 
 
+template <int spacedim>
+inline void
+TriaAccessor<0, 1, spacedim>::copy_from(
+  const TriaAccessorBase<0, 1, spacedim> &)
+{
+  // We cannot convert from TriaAccessorBase to
+  // TriaAccessor<0,1,spacedim> because the latter is not derived from
+  // the former. We should never get here.
+  Assert(false, ExcInternalError());
+}
+
+
+
 template <int spacedim>
 inline bool
 TriaAccessor<0, 1, spacedim>::operator<(