diff -r dc53362bc5a7 -r 581ad4fd01e9 src/cx/array_list.h
--- a/src/cx/array_list.h	Tue Oct 29 16:53:00 2024 +0100
+++ b/src/cx/array_list.h	Tue Oct 29 18:14:02 2024 +0100
@@ -120,11 +120,36 @@
 };
 
 /**
+ * Typedef for the array reallocator struct.
+ */
+typedef struct cx_array_reallocator_s CxArrayReallocator;
+
+/**
  * A default stdlib-based array reallocator.
  */
 extern struct cx_array_reallocator_s *cx_array_default_reallocator;
 
 /**
+ * Creates a new array reallocator.
+ *
+ * When \p allocator is \c NULL, the stdlib default allocator will be used.
+ *
+ * When \p stackmem is not \c NULL, the reallocator is supposed to be used
+ * \em only for the specific array that is initially located at \p stackmem.
+ * When reallocation is needed, the reallocator checks, if the array is
+ * still located at \p stackmem and copies the contents to the heap.
+ *
+ * @param allocator the allocator this reallocator shall be based on
+ * @param stackmem the address of the array when the array is initially located
+ * on the stack
+ * @return an array reallocator
+ */
+struct cx_array_reallocator_s cx_array_reallocator(
+        const struct cx_allocator_s *allocator,
+        const void *stackmem
+);
+
+/**
  * Return codes for array functions.
  */
 enum cx_array_result {