From: Luca Heltai <luca.heltai@sissa.it>
Date: Tue, 20 Dec 2022 18:07:53 +0000 (+0100)
Subject: Fix constness.
X-Git-Tag: v9.5.0-rc1~714^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=35c5658b81fd48ff884f42065d0bc6c9e6965990;p=dealii.git

Fix constness.
---

diff --git a/source/lac/petsc_parallel_block_sparse_matrix.cc b/source/lac/petsc_parallel_block_sparse_matrix.cc
index 49911c8dee..4d0accae14 100644
--- a/source/lac/petsc_parallel_block_sparse_matrix.cc
+++ b/source/lac/petsc_parallel_block_sparse_matrix.cc
@@ -176,7 +176,7 @@ namespace PETScWrappers
       return block(0, 0).get_mpi_communicator();
     }
 
-    BlockSparseMatrix::operator Mat() const
+    BlockSparseMatrix::operator const Mat &() const
     {
       return petsc_nest_matrix;
     }