From 76c3ff69b5cf4aeda6a26820b512de7bfccd23d6 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 21 Jan 2021 11:53:07 -0700
Subject: [PATCH] Add an assertion.

---
 source/grid/reference_cell.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/source/grid/reference_cell.cc b/source/grid/reference_cell.cc
index f9b9fecb15..b0af4ec88f 100644
--- a/source/grid/reference_cell.cc
+++ b/source/grid/reference_cell.cc
@@ -38,6 +38,11 @@ namespace ReferenceCell
     dealii::ReferenceCell::Type
     make_reference_cell_from_int(const std::uint8_t kind)
     {
+      // Make sure these are the only indices from which objects can be
+      // created.
+      Assert((kind == static_cast<std::uint8_t>(-1)) || (kind < 8),
+             ExcInternalError());
+
       // Call the private constructor, which we can from here because this
       // function is a 'friend'.
       return dealii::ReferenceCell::Type(kind);
-- 
2.39.5