From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 17 Nov 2022 20:46:24 +0000 (-0700)
Subject: Re-introduce (now deprecated) old constructor.
X-Git-Tag: v9.5.0-rc1~841^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F14438%2Fhead;p=dealii.git

Re-introduce (now deprecated) old constructor.
---

diff --git a/include/deal.II/lac/petsc_precondition.h b/include/deal.II/lac/petsc_precondition.h
index 16df0d8039..8b96a859fc 100644
--- a/include/deal.II/lac/petsc_precondition.h
+++ b/include/deal.II/lac/petsc_precondition.h
@@ -62,7 +62,15 @@ namespace PETScWrappers
     /**
      * Constructor.
      */
-    PreconditionBase(const MPI_Comm &mpi_communicator = MPI_COMM_NULL);
+    explicit PreconditionBase(const MPI_Comm &mpi_communicator);
+
+    /**
+     * Constructor. This constructor is deprecated.
+     *
+     * @deprecated
+     */
+    DEAL_II_DEPRECATED
+    PreconditionBase();
 
     /**
      * Destructor.
diff --git a/source/lac/petsc_precondition.cc b/source/lac/petsc_precondition.cc
index 6f145d31de..2124f58a0b 100644
--- a/source/lac/petsc_precondition.cc
+++ b/source/lac/petsc_precondition.cc
@@ -41,6 +41,12 @@ namespace PETScWrappers
 
 
 
+  PreconditionBase::PreconditionBase()
+    : PreconditionBase(MPI_COMM_NULL)
+  {}
+
+
+
   PreconditionBase::~PreconditionBase()
   {
     try