From 6e0aa053512e0f444aee8e3aea29b0b16b58d626 Mon Sep 17 00:00:00 2001
From: Daniel Arndt <arndtd@ornl.gov>
Date: Tue, 27 Jun 2023 08:43:05 -0400
Subject: [PATCH] Fix compiling with clang-16

---
 include/deal.II/distributed/tria_base.h      | 1 +
 include/deal.II/grid/tria_accessor.h         | 1 +
 source/distributed/fully_distributed_tria.cc | 4 ++--
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/deal.II/distributed/tria_base.h b/include/deal.II/distributed/tria_base.h
index 53d776d21f..6e9f74734f 100644
--- a/include/deal.II/distributed/tria_base.h
+++ b/include/deal.II/distributed/tria_base.h
@@ -76,6 +76,7 @@ namespace parallel
    * classes derived from the current one it actually is).
    */
   template <int dim, int spacedim = dim>
+  DEAL_II_CXX20_REQUIRES((concepts::is_valid_dim_spacedim<dim, spacedim>))
   class TriangulationBase : public dealii::Triangulation<dim, spacedim>
   {
   public:
diff --git a/include/deal.II/grid/tria_accessor.h b/include/deal.II/grid/tria_accessor.h
index df630f1da3..7cd996b8d7 100644
--- a/include/deal.II/grid/tria_accessor.h
+++ b/include/deal.II/grid/tria_accessor.h
@@ -51,6 +51,7 @@ class TriaActiveIterator;
 namespace parallel
 {
   template <int dim, int spacedim>
+  DEAL_II_CXX20_REQUIRES((concepts::is_valid_dim_spacedim<dim, spacedim>))
   class TriangulationBase;
 }
 
diff --git a/source/distributed/fully_distributed_tria.cc b/source/distributed/fully_distributed_tria.cc
index a903a8358b..06fe3ce08f 100644
--- a/source/distributed/fully_distributed_tria.cc
+++ b/source/distributed/fully_distributed_tria.cc
@@ -749,8 +749,8 @@ namespace parallel
 
 
     template <int dim, int spacedim>
-    void
-    Triangulation<dim, spacedim>::update_number_cache()
+    DEAL_II_CXX20_REQUIRES((concepts::is_valid_dim_spacedim<dim, spacedim>))
+    void Triangulation<dim, spacedim>::update_number_cache()
     {
       dealii::parallel::TriangulationBase<dim, spacedim>::update_number_cache();
 
-- 
2.39.5