From c98c3a8b85dfb14ad14e0d8edb7e0205ba03d74f Mon Sep 17 00:00:00 2001
From: Ole Albers <ole.albers@dlr.de>
Date: Fri, 18 Oct 2024 14:05:20 +0200
Subject: [PATCH] create hex copy function

---
 .../t8_default/t8_default_hex/t8_default_hex.cxx      |  2 +-
 .../t8_default/t8_default_hex/t8_dhex_bits.c          | 11 +++++++++++
 .../t8_default/t8_default_hex/t8_dhex_bits.h          |  7 +++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/t8_schemes/t8_default/t8_default_hex/t8_default_hex.cxx b/src/t8_schemes/t8_default/t8_default_hex/t8_default_hex.cxx
index 5465eda575..daadfc02b6 100644
--- a/src/t8_schemes/t8_default/t8_default_hex/t8_default_hex.cxx
+++ b/src/t8_schemes/t8_default/t8_default_hex/t8_default_hex.cxx
@@ -51,7 +51,7 @@ t8_default_scheme_hex_c::t8_element_copy (const t8_element_t *source, t8_element
 {
   T8_ASSERT (t8_element_is_valid (source));
   T8_ASSERT (t8_element_is_valid (dest));
-  *(p8est_quadrant_t *) dest = *(const p8est_quadrant_t *) source;
+  t8_dhex_copy ((const t8_dhex_t *) source, (t8_dhex_t *) dest);
 }
 
 int
diff --git a/src/t8_schemes/t8_default/t8_default_hex/t8_dhex_bits.c b/src/t8_schemes/t8_default/t8_default_hex/t8_dhex_bits.c
index 5ddec13a69..5131e6ae38 100644
--- a/src/t8_schemes/t8_default/t8_default_hex/t8_dhex_bits.c
+++ b/src/t8_schemes/t8_default/t8_default_hex/t8_dhex_bits.c
@@ -47,3 +47,14 @@ t8_dhex_compute_reference_coords (const t8_dhex_t *elem, const double *ref_coord
     out_coords[offset + 2] /= (double) P8EST_ROOT_LEN;
   }
 }
+
+/*Copies a hexahedra from source to dest*/
+void
+t8_dhex_copy (const t8_dhex_t *source, t8_dhex_t *dest)
+{
+  T8_ASSERT (source != NULL && dest != NULL);
+  if (source == dest) {
+    return;
+  }
+  memcpy (dest, source, sizeof (t8_dhex_t));
+}
diff --git a/src/t8_schemes/t8_default/t8_default_hex/t8_dhex_bits.h b/src/t8_schemes/t8_default/t8_default_hex/t8_dhex_bits.h
index 92c5ec8cec..3e97662931 100644
--- a/src/t8_schemes/t8_default/t8_default_hex/t8_dhex_bits.h
+++ b/src/t8_schemes/t8_default/t8_default_hex/t8_dhex_bits.h
@@ -46,6 +46,13 @@ void
 t8_dhex_compute_reference_coords (const t8_dhex_t *elem, const double *ref_coords, const size_t num_coords,
                                   double *out_coords);
 
+/** Copy the data from source to dest
+ * \param[in] source    The source-hex
+ * \param[in,out] dest  The destination
+ */
+void
+t8_dhex_copy (const t8_dhex_t *source, t8_dhex_t *dest);
+
 T8_EXTERN_C_END ();
 
 #endif /* T8_DHEX_BITS_H */