From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Sun, 2 Jul 2023 21:17:06 +0000 (-0600)
Subject: Add sequential parallel_for.
X-Git-Tag: relicensing~765^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b6c1f41ad314cd86f2f07527487a2009c0ad936;p=dealii.git

Add sequential parallel_for.
---

diff --git a/include/deal.II/base/parallel.h b/include/deal.II/base/parallel.h
index ee85ca2ed0..bbf6eeb354 100644
--- a/include/deal.II/base/parallel.h
+++ b/include/deal.II/base/parallel.h
@@ -34,6 +34,8 @@
 #  include <tbb/parallel_for.h>
 #  include <tbb/parallel_reduce.h>
 #  include <tbb/partitioner.h>
+#else
+#  include <boost/range/iterator_range.hpp>
 #endif
 
 #ifdef DEAL_II_HAVE_CXX20
@@ -106,6 +108,22 @@ namespace parallel
                         functor,
                         *partitioner);
     }
+
+#else
+
+    /**
+     * Just execute things sequentially.
+     */
+    template <typename Iterator, typename Functor>
+    void
+    parallel_for(Iterator       x_begin,
+                 Iterator       x_end,
+                 const Functor &functor,
+                 const unsigned int)
+    {
+      functor(boost::iterator_range<Iterator>(x_begin, x_end));
+    }
+
 #endif
   } // namespace internal