From: Marc Fehling <mafehling.git@gmail.com>
Date: Fri, 21 May 2021 19:34:14 +0000 (-0600)
Subject: Fix clang-tidy issues with #12246.
X-Git-Tag: v9.3.0-rc1~14^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F12276%2Fhead;p=dealii.git

Fix clang-tidy issues with #12246.
---

diff --git a/source/numerics/derivative_approximation.cc b/source/numerics/derivative_approximation.cc
index 6b03c32d3b..d7d01a75a9 100644
--- a/source/numerics/derivative_approximation.cc
+++ b/source/numerics/derivative_approximation.cc
@@ -801,7 +801,11 @@ namespace DerivativeApproximation
                                                           solution,
                                                           component);
       // ...and the place where it lives
-      const Point<dim> this_center = fe_midpoint_value.quadrature_point(0);
+      // This needs to be a copy. If it was a reference, it would be changed
+      // after the next `reinit` call of the FEValues object. clang-tidy
+      // complains about this not being a reference, so we suppress the warning.
+      const Point<dim> this_center =
+        fe_midpoint_value.quadrature_point(0); // NOLINT
 
       // loop over all neighbors and
       // accumulate the difference