From 3f4cf71efd39be4ebd08459bd2da4fee757a7bda Mon Sep 17 00:00:00 2001
From: wolf <wolf@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Fri, 24 Aug 2001 13:36:48 +0000
Subject: [PATCH] Add another safety check.

git-svn-id: https://svn.dealii.org/trunk@4909 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/deal.II/source/numerics/error_estimator.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/deal.II/deal.II/source/numerics/error_estimator.cc b/deal.II/deal.II/source/numerics/error_estimator.cc
index c9efeaa25d..7c6460dbf5 100644
--- a/deal.II/deal.II/source/numerics/error_estimator.cc
+++ b/deal.II/deal.II/source/numerics/error_estimator.cc
@@ -921,6 +921,13 @@ integrate_over_regular_face (Data                       &data,
 	for (unsigned int p=0; p<n_q_points; ++p)
 	  face_integral[n] += ::sqr(data.phi[n][p][component]) *
 			      data.JxW_values[p];
+
+				   // double check that the element
+				   // already exists and that it was
+				   // not already written to
+  Assert (data.face_integrals.find (face) != data.face_integrals.end(),
+	  ExcInternalError());
+  Assert (data.face_integrals[face][0] < 0, ExcInternalError());
   
   data.face_integrals[face] = face_integral;
 };
-- 
2.39.5