diff -r 08539b8273fa -r 4fbfac557df8 src/cx/list.h
--- a/src/cx/list.h	Mon Apr 18 16:56:29 2022 +0200
+++ b/src/cx/list.h	Mon Apr 18 17:26:21 2022 +0200
@@ -71,13 +71,6 @@
      */
     CxAllocator const *allocator;
     /**
-     * An optional destructor for the list contents.
-     *
-     * @attention Read the documentation of the particular list implementation
-     * whether this destructor shall only destroy the contents or also free the memory.
-     */
-    cx_destructor_func content_destructor;
-    /**
      * The comparator function for the elements.
      */
     CxListComparator cmpfunc;
@@ -93,6 +86,30 @@
      * The capacity of the list (maximum number of elements).
      */
     size_t capacity;
+    union {
+        /**
+         * An optional simple destructor for the list contents that admits the free() interface.
+         *
+         * @remark Set content_destructor_type to #CX_DESTRUCTOR_SIMPLE.
+         *
+         * @attention Read the documentation of the particular list implementation
+         * whether this destructor shall only destroy the contents or also free the memory.
+         */
+        cx_destructor_func simple_destructor;
+        /**
+         * An optional advanced destructor for the list contents providing additional data.
+         *
+         * @remark Set content_destructor_type to #CX_DESTRUCTOR_ADVANCED.
+         *
+         * @attention Read the documentation of the particular list implementation
+         * whether this destructor shall only destroy the contents or also free the memory.
+         */
+        cx_advanced_destructor advanced_destructor;
+    };
+    /**
+     * The type of destructor to use.
+     */
+    enum cx_destructor_type content_destructor_type;
 };
 
 /**
@@ -389,19 +406,17 @@
 }
 
 /**
- * Calls the list's destructor function for every element.
- * If CxList.autofree_content is \c true, the elements are automatically free'd
- * unless the content destructor function did not already do that.
- * Similarly, if CxList.autofree is \c true, the list structure is free'd, unless
- * the list destructor function did not already do that.
+ * Deallocates the memory of the specified list structure.
+ *
+ * Also calls content a destructor function, depending on the configuration
+ * in CxList.content_destructor_type.
  *
  * This function itself is a destructor function for the CxList.
  *
- * @param list the list which contents shall be destroyed
- * @return \p list if the list structure has not been free'd during the process
+ * @param list the list which shall be destroyed
  */
 __attribute__((__nonnull__))
-CxList *cxListDestroy(CxList *list);
+void cxListDestroy(CxList *list);
 
 #ifdef __cplusplus
 } /* extern "C" */