From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Fri, 7 Jan 2022 07:19:23 +0000 (-0700)
Subject: Fix comparison of objects.
X-Git-Tag: v9.4.0-rc1~645^2~3
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b8c6b4c403ae1f31071cd38d09d1dab85e4858d0;p=dealii.git

Fix comparison of objects.
---

diff --git a/include/deal.II/lac/sparsity_pattern.h b/include/deal.II/lac/sparsity_pattern.h
index fa3d9b65df..011acc1acb 100644
--- a/include/deal.II/lac/sparsity_pattern.h
+++ b/include/deal.II/lac/sparsity_pattern.h
@@ -1644,13 +1644,15 @@ SparsityPatternBase::operator==(const SparsityPatternBase &sp2) const
   if (rows != sp2.rows || cols != sp2.cols || compressed != sp2.compressed)
     return false;
 
-  for (size_type i = 0; i < rows + 1; ++i)
-    if (rowstart[i] != sp2.rowstart[i])
-      return false;
-
-  for (size_type i = 0; i < rowstart[rows]; ++i)
-    if (colnums[i] != sp2.colnums[i])
-      return false;
+  if (rows > 0)
+    for (size_type i = 0; i < rows + 1; ++i)
+      if (rowstart[i] != sp2.rowstart[i])
+        return false;
+
+  if (rows > 0)
+    for (size_type i = 0; i < rowstart[rows]; ++i)
+      if (colnums[i] != sp2.colnums[i])
+        return false;
 
   return true;
 }