From f6c1ef152d2ec619f15b9a3aebbae01636481648 Mon Sep 17 00:00:00 2001
From: Sandro Elsweijer <sandro.elsweijer@dlr.de>
Date: Wed, 1 Apr 2026 15:44:52 +0200
Subject: [PATCH 1/2] remove not allowed operations from geometry hash

---
 src/t8_geometry/t8_geometry_hash.hxx | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/t8_geometry/t8_geometry_hash.hxx b/src/t8_geometry/t8_geometry_hash.hxx
index 4fc3201f64..ab0eaa5392 100644
--- a/src/t8_geometry/t8_geometry_hash.hxx
+++ b/src/t8_geometry/t8_geometry_hash.hxx
@@ -21,7 +21,7 @@
 */
 
 /** \file t8_geometry_hash.hxx
- * Defines data types and functions for handling hash values of 
+ * Defines data types and functions for handling hash values of
  * geometries.
  */
 
@@ -40,16 +40,15 @@ struct t8_geometry_hash_tag
 T8_EXTERN_C_BEGIN ();
 
 /** Data type used for storing hash values of geometries. */
-using t8_geometry_hash = T8Type<size_t, t8_geometry_hash_tag, Addable, Subtractable, AddAssignable, Multipliable,
-                                Dividable, EqualityComparable, Hashable>;
+using t8_geometry_hash = T8Type<size_t, t8_geometry_hash_tag, EqualityComparable, Hashable>;
 
 /** Constant that we use for hashes of non-existing geometries. */
 static const t8_geometry_hash t8_geometry_empty_hash (std::hash<std::string> {}(""));
 
 /**
  * Compute the hash value of a geometry's name.
- *  
- * \param [in] name The name of a geometry.
+ *
+ * \param [in] name The name of a geoemetry.
  * \return The hash value of \a name.
  * \note \a name being empty here is explicitly allowed and used as hash values for non-existing geometries.
  */
@@ -63,7 +62,7 @@ t8_geometry_compute_hash (const std::string &name)
 /**
  * Query whether a given hash value corresponds to an empty string and hence
  * a non-existing geometry.
- * 
+ *
  * \param [in] hash A hash value of a geometry.
  * \return true If \a hash corresponds to a non-existing geometry,i.e. if \a hash == \a t8_geometry_empty_hash.
  * \return false If \a hash corresponds to an existing geometry.

From 3860f6373cfb0499f21d977f9133a5ca80a0e615 Mon Sep 17 00:00:00 2001
From: Sandro Elsweijer <sandro.elsweijer@dlr.de>
Date: Wed, 1 Apr 2026 16:11:22 +0200
Subject: [PATCH 2/2] fix typo

---
 src/t8_geometry/t8_geometry_hash.hxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/t8_geometry/t8_geometry_hash.hxx b/src/t8_geometry/t8_geometry_hash.hxx
index ab0eaa5392..b1bfe09f0e 100644
--- a/src/t8_geometry/t8_geometry_hash.hxx
+++ b/src/t8_geometry/t8_geometry_hash.hxx
@@ -48,8 +48,8 @@ static const t8_geometry_hash t8_geometry_empty_hash (std::hash<std::string> {}(
 /**
  * Compute the hash value of a geometry's name.
  *
- * \param [in] name The name of a geoemetry.
- * \return The hash value of \a name.
+ * \param [in] name The name of a geometry.
+ * \return          The hash value of \a name.
  * \note \a name being empty here is explicitly allowed and used as hash values for non-existing geometries.
  */
 inline t8_geometry_hash