CarpetLib: Output error message for illegal bbox setups

1 files changed, 5 insertions, 0 deletions

diff --git a/Carpet/CarpetLib/src/bbox.hh b/Carpet/CarpetLib/src/bbox.hh
index f9fe2b906..2847576b5 100644
--- a/Carpet/CarpetLib/src/bbox.hh
+++ b/Carpet/CarpetLib/src/bbox.hh
@@ -80,6 +80,11 @@ public:
 #ifdef CARPET_DEBUG
     assert_bbox_limits();
 #endif
+    if (not (all (stride() > T(0))) or
+        not (all ((upper() - lower()) % stride() == T(0))))
+    {
+      cerr << "bbox: lower=" << lower() << " upper=" << upper() << " stride=" << stride() << "\n";
+    }
     assert (all (stride() > T(0)));
     assert (all ((upper() - lower()) % stride() == T(0)));
   }