diff -r 38cb8e3992e8 -r ce13a778654a ucx/cx/list.h
--- a/ucx/cx/list.h	Thu Oct 03 18:54:19 2024 +0200
+++ b/ucx/cx/list.h	Sun Oct 06 12:00:31 2024 +0200
@@ -52,15 +52,15 @@
  * Structure for holding the base data of a list.
  */
 struct cx_list_s {
-    CX_COLLECTION_MEMBERS
+    CX_COLLECTION_BASE;
     /**
      * The list class definition.
      */
-    cx_list_class const *cl;
+    const cx_list_class *cl;
     /**
      * The actual implementation in case the list class is delegating.
      */
-    cx_list_class const *climpl;
+    const cx_list_class *climpl;
 };
 
 /**
@@ -71,7 +71,7 @@
      * Destructor function.
      *
      * Implementations SHALL invoke the content destructor functions if provided
-     * and SHALL deallocate the list memory, if an allocator is provided.
+     * and SHALL deallocate the list memory.
      */
     void (*destructor)(struct cx_list_s *list);
 
@@ -82,17 +82,29 @@
     int (*insert_element)(
             struct cx_list_s *list,
             size_t index,
-            void const *data
+            const void *data
     );
 
     /**
      * Member function for inserting multiple elements.
      * Implementors SHOULD see to performant implementations for corner cases.
+     * @see cx_list_default_insert_array()
      */
     size_t (*insert_array)(
             struct cx_list_s *list,
             size_t index,
-            void const *data,
+            const void *data,
+            size_t n
+    );
+
+    /**
+     * Member function for inserting sorted elements into a sorted list.
+     *
+     * @see cx_list_default_insert_sorted()
+     */
+    size_t (*insert_sorted)(
+            struct cx_list_s *list,
+            const void *sorted_data,
             size_t n
     );
 
@@ -100,8 +112,8 @@
      * Member function for inserting an element relative to an iterator position.
      */
     int (*insert_iter)(
-            struct cx_mut_iterator_s *iter,
-            void const *elem,
+            struct cx_iterator_s *iter,
+            const void *elem,
             int prepend
     );
 
@@ -120,6 +132,7 @@
 
     /**
      * Member function for swapping two elements.
+     * @see cx_list_default_swap()
      */
     int (*swap)(
             struct cx_list_s *list,
@@ -131,7 +144,7 @@
      * Member function for element lookup.
      */
     void *(*at)(
-            struct cx_list_s const *list,
+            const struct cx_list_s *list,
             size_t index
     );
 
@@ -140,21 +153,24 @@
      */
     ssize_t (*find_remove)(
             struct cx_list_s *list,
-            void const *elem,
+            const void *elem,
             bool remove
     );
 
     /**
      * Member function for sorting the list in-place.
+     * @see cx_list_default_sort()
      */
     void (*sort)(struct cx_list_s *list);
 
     /**
-     * Member function for comparing this list to another list of the same type.
+     * Optional member function for comparing this list
+     * to another list of the same type.
+     * If set to \c NULL, comparison won't be optimized.
      */
     int (*compare)(
-            struct cx_list_s const *list,
-            struct cx_list_s const *other
+            const struct cx_list_s *list,
+            const struct cx_list_s *other
     );
 
     /**
@@ -166,13 +182,87 @@
      * Member function for returning an iterator pointing to the specified index.
      */
     struct cx_iterator_s (*iterator)(
-            struct cx_list_s const *list,
+            const struct cx_list_s *list,
             size_t index,
             bool backward
     );
 };
 
 /**
+ * Default implementation of an array insert.
+ *
+ * This function uses the element insert function for each element of the array.
+ *
+ * Use this in your own list class if you do not want to implement an optimized
+ * version for your list.
+ *
+ * @param list the list
+ * @param index the index where to insert the data
+ * @param data a pointer to the array of data to insert
+ * @param n the number of elements to insert
+ * @return the number of elements actually inserted
+ */
+__attribute__((__nonnull__))
+size_t cx_list_default_insert_array(
+        struct cx_list_s *list,
+        size_t index,
+        const void *data,
+        size_t n
+);
+
+/**
+ * Default implementation of a sorted insert.
+ *
+ * This function uses the array insert function to insert consecutive groups
+ * of sorted data.
+ *
+ * The source data \em must already be sorted wrt. the list's compare function.
+ *
+ * Use this in your own list class if you do not want to implement an optimized
+ * version for your list.
+ *
+ * @param list the list
+ * @param sorted_data a pointer to the array of pre-sorted data to insert
+ * @param n the number of elements to insert
+ * @return the number of elements actually inserted
+ */
+__attribute__((__nonnull__))
+size_t cx_list_default_insert_sorted(
+        struct cx_list_s *list,
+        const void *sorted_data,
+        size_t n
+);
+
+/**
+ * Default unoptimized sort implementation.
+ *
+ * This function will copy all data to an array, sort the array with standard
+ * qsort, and then copy the data back to the list memory.
+ *
+ * Use this in your own list class if you do not want to implement an optimized
+ * version for your list.
+ *
+ * @param list the list that shall be sorted
+ */
+__attribute__((__nonnull__))
+void cx_list_default_sort(struct cx_list_s *list);
+
+/**
+ * Default unoptimized swap implementation.
+ *
+ * Use this in your own list class if you do not want to implement an optimized
+ * version for your list.
+ *
+ * @param list the list in which to swap
+ * @param i index of one element
+ * @param j index of the other element
+ * @return zero on success, non-zero when indices are out of bounds or memory
+ * allocation for the temporary buffer fails
+ */
+__attribute__((__nonnull__))
+int cx_list_default_swap(struct cx_list_s *list, size_t i, size_t j);
+
+/**
  * Common type for all list implementations.
  */
 typedef struct cx_list_s CxList;
@@ -212,8 +302,8 @@
  * @see cxListStorePointers()
  */
 __attribute__((__nonnull__))
-static inline bool cxListIsStoringPointers(CxList const *list) {
-    return list->store_pointer;
+static inline bool cxListIsStoringPointers(const CxList *list) {
+    return list->collection.store_pointer;
 }
 
 /**
@@ -223,8 +313,8 @@
  * @return the number of currently stored elements
  */
 __attribute__((__nonnull__))
-static inline size_t cxListSize(CxList const *list) {
-    return list->size;
+static inline size_t cxListSize(const CxList *list) {
+    return list->collection.size;
 }
 
 /**
@@ -238,9 +328,9 @@
 __attribute__((__nonnull__))
 static inline int cxListAdd(
         CxList *list,
-        void const *elem
+        const void *elem
 ) {
-    return list->cl->insert_element(list, list->size, elem);
+    return list->cl->insert_element(list, list->collection.size, elem);
 }
 
 /**
@@ -262,10 +352,10 @@
 __attribute__((__nonnull__))
 static inline size_t cxListAddArray(
         CxList *list,
-        void const *array,
+        const void *array,
         size_t n
 ) {
-    return list->cl->insert_array(list, list->size, array, n);
+    return list->cl->insert_array(list, list->collection.size, array, n);
 }
 
 /**
@@ -285,12 +375,28 @@
 static inline int cxListInsert(
         CxList *list,
         size_t index,
-        void const *elem
+        const void *elem
 ) {
     return list->cl->insert_element(list, index, elem);
 }
 
 /**
+ * Inserts an item into a sorted list.
+ *
+ * @param list the list
+ * @param elem a pointer to the element to add
+ * @return zero on success, non-zero on memory allocation failure
+ */
+__attribute__((__nonnull__))
+static inline int cxListInsertSorted(
+        CxList *list,
+        const void *elem
+) {
+    const void *data = list->collection.store_pointer ? &elem : elem;
+    return list->cl->insert_sorted(list, data, 1) == 0;
+}
+
+/**
  * Inserts multiple items to the list at the specified index.
  * If \p index equals the list size, this is effectively cxListAddArray().
  *
@@ -313,13 +419,39 @@
 static inline size_t cxListInsertArray(
         CxList *list,
         size_t index,
-        void const *array,
+        const void *array,
         size_t n
 ) {
     return list->cl->insert_array(list, index, array, n);
 }
 
 /**
+ * Inserts a sorted array into a sorted list.
+ *
+ * This method is usually more efficient than inserting each element separately,
+ * because consecutive chunks of sorted data are inserted in one pass.
+ *
+ * If there is not enough memory to add all elements, the returned value is
+ * less than \p n.
+ *
+ * If this list is storing pointers instead of objects \p array is expected to
+ * be an array of pointers.
+ *
+ * @param list the list
+ * @param array a pointer to the elements to add
+ * @param n the number of elements to add
+ * @return the number of added elements
+ */
+__attribute__((__nonnull__))
+static inline size_t cxListInsertSortedArray(
+        CxList *list,
+        const void *array,
+        size_t n
+) {
+    return list->cl->insert_sorted(list, array, n);
+}
+
+/**
  * Inserts an element after the current location of the specified iterator.
  *
  * The used iterator remains operational, but all other active iterators should
@@ -336,10 +468,10 @@
  */
 __attribute__((__nonnull__))
 static inline int cxListInsertAfter(
-        CxMutIterator *iter,
-        void const *elem
+        CxIterator *iter,
+        const void *elem
 ) {
-    return ((struct cx_list_s *) iter->src_handle)->cl->insert_iter(iter, elem, 0);
+    return ((struct cx_list_s *) iter->src_handle.m)->cl->insert_iter(iter, elem, 0);
 }
 
 /**
@@ -359,10 +491,10 @@
  */
 __attribute__((__nonnull__))
 static inline int cxListInsertBefore(
-        CxMutIterator *iter,
-        void const *elem
+        CxIterator *iter,
+        const void *elem
 ) {
-    return ((struct cx_list_s *) iter->src_handle)->cl->insert_iter(iter, elem, 1);
+    return ((struct cx_list_s *) iter->src_handle.m)->cl->insert_iter(iter, elem, 1);
 }
 
 /**
@@ -444,7 +576,7 @@
  */
 __attribute__((__nonnull__, __warn_unused_result__))
 static inline CxIterator cxListIteratorAt(
-        CxList const *list,
+        const CxList *list,
         size_t index
 ) {
     return list->cl->iterator(list, index, false);
@@ -463,7 +595,7 @@
  */
 __attribute__((__nonnull__, __warn_unused_result__))
 static inline CxIterator cxListBackwardsIteratorAt(
-        CxList const *list,
+        const CxList *list,
         size_t index
 ) {
     return list->cl->iterator(list, index, true);
@@ -481,7 +613,7 @@
  * @return a new iterator
  */
 __attribute__((__nonnull__, __warn_unused_result__))
-CxMutIterator cxListMutIteratorAt(
+CxIterator cxListMutIteratorAt(
         CxList *list,
         size_t index
 );
@@ -499,7 +631,7 @@
  * @return a new iterator
  */
 __attribute__((__nonnull__, __warn_unused_result__))
-CxMutIterator cxListMutBackwardsIteratorAt(
+CxIterator cxListMutBackwardsIteratorAt(
         CxList *list,
         size_t index
 );
@@ -515,7 +647,7 @@
  * @return a new iterator
  */
 __attribute__((__nonnull__, __warn_unused_result__))
-static inline CxIterator cxListIterator(CxList const *list) {
+static inline CxIterator cxListIterator(const CxList *list) {
     return list->cl->iterator(list, 0, false);
 }
 
@@ -530,7 +662,7 @@
  * @return a new iterator
  */
 __attribute__((__nonnull__, __warn_unused_result__))
-static inline CxMutIterator cxListMutIterator(CxList *list) {
+static inline CxIterator cxListMutIterator(CxList *list) {
     return cxListMutIteratorAt(list, 0);
 }
 
@@ -546,8 +678,8 @@
  * @return a new iterator
  */
 __attribute__((__nonnull__, __warn_unused_result__))
-static inline CxIterator cxListBackwardsIterator(CxList const *list) {
-    return list->cl->iterator(list, list->size - 1, true);
+static inline CxIterator cxListBackwardsIterator(const CxList *list) {
+    return list->cl->iterator(list, list->collection.size - 1, true);
 }
 
 /**
@@ -561,8 +693,8 @@
  * @return a new iterator
  */
 __attribute__((__nonnull__, __warn_unused_result__))
-static inline CxMutIterator cxListMutBackwardsIterator(CxList *list) {
-    return cxListMutBackwardsIteratorAt(list, list->size - 1);
+static inline CxIterator cxListMutBackwardsIterator(CxList *list) {
+    return cxListMutBackwardsIteratorAt(list, list->collection.size - 1);
 }
 
 /**
@@ -577,8 +709,8 @@
  */
 __attribute__((__nonnull__))
 static inline ssize_t cxListFind(
-        CxList const *list,
-        void const *elem
+        const CxList *list,
+        const void *elem
 ) {
     return list->cl->find_remove((CxList*)list, elem, false);
 }
@@ -596,7 +728,7 @@
 __attribute__((__nonnull__))
 static inline ssize_t cxListFindRemove(
         CxList *list,
-        void const *elem
+        const void *elem
 ) {
     return list->cl->find_remove(list, elem, true);
 }
@@ -636,8 +768,8 @@
  */
 __attribute__((__nonnull__))
 int cxListCompare(
-        CxList const *list,
-        CxList const *other
+        const CxList *list,
+        const CxList *other
 );
 
 /**