diff -r d4baf4dd55c3 -r fe0d69d72bcd src/list.c
--- a/src/list.c	Thu May 23 19:29:14 2024 +0200
+++ b/src/list.c	Thu May 23 20:29:28 2024 +0200
@@ -47,14 +47,14 @@
 
 static void cx_pl_hack_cmpfunc(struct cx_list_s const *list) {
     // cast away const - this is the hacky thing
-    struct cx_list_s *l = (struct cx_list_s *) list;
+    struct cx_collection_s *l = (struct cx_collection_s*) &list->base;
     cx_pl_cmpfunc_impl = l->cmpfunc;
     l->cmpfunc = cx_pl_cmpfunc;
 }
 
 static void cx_pl_unhack_cmpfunc(struct cx_list_s const *list) {
     // cast away const - this is the hacky thing
-    struct cx_list_s *l = (struct cx_list_s *) list;
+    struct cx_collection_s *l = (struct cx_collection_s*) &list->base;
     l->cmpfunc = cx_pl_cmpfunc_impl;
 }
 
@@ -148,7 +148,7 @@
 
 static void *cx_pl_iter_current(void const *it) {
     struct cx_iterator_s const *iter = it;
-    void **ptr = iter->current_impl(it);
+    void **ptr = iter->base.current_impl(it);
     return ptr == NULL ? NULL : *ptr;
 }
 
@@ -158,8 +158,8 @@
         bool backwards
 ) {
     struct cx_iterator_s iter = list->climpl->iterator(list, index, backwards);
-    iter.current_impl = iter.current;
-    iter.current = cx_pl_iter_current;
+    iter.base.current_impl = iter.base.current;
+    iter.base.current = cx_pl_iter_current;
     return iter;
 }
 
@@ -180,7 +180,7 @@
 };
 
 void cxListStoreObjects(CxList *list) {
-    list->store_pointer = false;
+    list->base.store_pointer = false;
     if (list->climpl != NULL) {
         list->cl = list->climpl;
         list->climpl = NULL;
@@ -188,8 +188,8 @@
 }
 
 void cxListStorePointers(CxList *list) {
-    list->item_size = sizeof(void *);
-    list->store_pointer = true;
+    list->base.item_size = sizeof(void *);
+    list->base.store_pointer = true;
     list->climpl = list->cl;
     list->cl = &cx_pointer_list_class;
 }
@@ -221,7 +221,7 @@
         __attribute__((__unused__)) struct cx_list_s const *list,
         struct cx_list_s const *other
 ) {
-    if (other->size == 0) return 0;
+    if (other->base.size == 0) return 0;
     return -1;
 }
 
@@ -237,7 +237,7 @@
     CxIterator iter = {0};
     iter.src_handle.c = list;
     iter.index = index;
-    iter.valid = cx_emptyl_iter_valid;
+    iter.base.valid = cx_emptyl_iter_valid;
     return iter;
 }
 
@@ -258,14 +258,16 @@
 };
 
 CxList cx_empty_list = {
-        NULL,
-        NULL,
-        0,
-        0,
-        NULL,
-        NULL,
-        NULL,
-        false,
+        {
+                NULL,
+                NULL,
+                0,
+                0,
+                NULL,
+                NULL,
+                NULL,
+                false
+        },
         &cx_empty_list_class,
         NULL
 };
@@ -284,7 +286,7 @@
 ) {
     if (
         // if one is storing pointers but the other is not
-        (list->store_pointer ^ other->store_pointer) ||
+        (list->base.store_pointer ^ other->base.store_pointer) ||
 
         // if one class is wrapped but the other is not
         ((list->climpl == NULL) ^ (other->climpl == NULL)) ||
@@ -294,13 +296,13 @@
          (other->climpl != NULL ? other->climpl->compare : other->cl->compare))
     ) {
         // lists are definitely different - cannot use internal compare function
-        if (list->size == other->size) {
+        if (list->base.size == other->base.size) {
             CxIterator left = list->cl->iterator(list, 0, false);
             CxIterator right = other->cl->iterator(other, 0, false);
-            for (size_t i = 0; i < list->size; i++) {
+            for (size_t i = 0; i < list->base.size; i++) {
                 void *leftValue = cxIteratorCurrent(left);
                 void *rightValue = cxIteratorCurrent(right);
-                int d = list->cmpfunc(leftValue, rightValue);
+                int d = list->base.cmpfunc(leftValue, rightValue);
                 if (d != 0) {
                     return d;
                 }
@@ -309,7 +311,7 @@
             }
             return 0;
         } else {
-            return list->size < other->size ? -1 : 1;
+            return list->base.size < other->base.size ? -1 : 1;
         }
     } else {
         // lists are compatible
@@ -322,7 +324,7 @@
         size_t index
 ) {
     CxIterator it = list->cl->iterator(list, index, false);
-    it.mutating = true;
+    it.base.mutating = true;
     return it;
 }
 
@@ -331,6 +333,6 @@
         size_t index
 ) {
     CxIterator it = list->cl->iterator(list, index, true);
-    it.mutating = true;
+    it.base.mutating = true;
     return it;
 }