From be6ae56f4e8cbc37df3a7819e159a514c804c25e Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Wed, 21 Sep 2022 14:34:12 -0600
Subject: [PATCH] Introduce a new exception for HDF5.

---
 include/deal.II/base/exceptions.h |  9 +++++++++
 source/base/data_out_base.cc      |  6 +-----
 source/lac/scalapack.cc           | 12 ++----------
 3 files changed, 12 insertions(+), 15 deletions(-)

diff --git a/include/deal.II/base/exceptions.h b/include/deal.II/base/exceptions.h
index e4e62af343..dbcf2e6b94 100644
--- a/include/deal.II/base/exceptions.h
+++ b/include/deal.II/base/exceptions.h
@@ -1106,6 +1106,15 @@ namespace StandardExceptions
     "if deal.II was configured to use LAPACK, but cmake did not "
     "find a valid LAPACK library.");
 
+  /**
+   * This function requires support for the HDF5 library.
+   */
+  DeclExceptionMsg(
+    ExcNeedsHDF5,
+    "You are attempting to use functionality that requires that deal.II is configured "
+    "with HDF5 support. However, when you called 'cmake', HDF5 support "
+    "was not detected.");
+
   /**
    * This function requires support for the MPI library.
    */
diff --git a/source/base/data_out_base.cc b/source/base/data_out_base.cc
index e4d8710562..4cff7171f5 100644
--- a/source/base/data_out_base.cc
+++ b/source/base/data_out_base.cc
@@ -8825,11 +8825,7 @@ DataOutBase::write_hdf5_parallel(
   (void)mesh_filename;
   (void)solution_filename;
   (void)comm;
-  AssertThrow(false,
-              ExcMessage(
-                "This function requires that deal.II is configured "
-                "with HDF5 support, but when you called 'cmake', HDF5 support "
-                "was not detected."));
+  AssertThrow(false, ExcNeedsHDF5());
 #else
 
   const unsigned int n_ranks = Utilities::MPI::n_mpi_processes(comm);
diff --git a/source/lac/scalapack.cc b/source/lac/scalapack.cc
index ff104138d2..01470b6d8d 100644
--- a/source/lac/scalapack.cc
+++ b/source/lac/scalapack.cc
@@ -2611,11 +2611,7 @@ ScaLAPACKMatrix<NumberType>::save(
 #  ifndef DEAL_II_WITH_HDF5
   (void)filename;
   (void)chunk_size;
-  AssertThrow(false,
-              ExcMessage(
-                "This function requires that deal.II is configured "
-                "with HDF5 support, but when you called 'cmake', HDF5 support "
-                "was not detected."));
+  AssertThrow(false, ExcNeedsHDF5());
 #  else
 
   std::pair<unsigned int, unsigned int> chunks_size_ = chunk_size;
@@ -3047,11 +3043,7 @@ ScaLAPACKMatrix<NumberType>::load(const std::string &filename)
 {
 #  ifndef DEAL_II_WITH_HDF5
   (void)filename;
-  AssertThrow(false,
-              ExcMessage(
-                "This function requires that deal.II is configured "
-                "with HDF5 support, but when you called 'cmake', HDF5 support "
-                "was not detected."));
+  AssertThrow(false, ExcNeedsHDF5());
 #  else
 #    ifdef H5_HAVE_PARALLEL
   // implementation for configurations equipped with a parallel file system
-- 
2.39.5