diff -r 949908c97474 -r 2be8fe3d5a2d src/cx/array_list.h
--- a/src/cx/array_list.h	Wed Jan 24 22:19:05 2024 +0100
+++ b/src/cx/array_list.h	Thu Jan 25 22:01:12 2024 +0100
@@ -96,7 +96,7 @@
 /**
  * A default stdlib-based array reallocator.
  */
-extern struct cx_array_reallocator_s cx_array_default_reallocator;
+extern struct cx_array_reallocator_s *cx_array_default_reallocator;
 
 /**
  * Return codes for cx_array_copy().
@@ -117,7 +117,7 @@
  * capacity is used.
  *
  * If the capacity is insufficient to hold the new data, a reallocation
- * attempt is made, unless the allocator is set to \c NULL, in which case
+ * attempt is made, unless the \p reallocator is set to \c NULL, in which case
  * this function ultimately returns a failure.
  *
  * @param target the target array
@@ -143,6 +143,28 @@
         struct cx_array_reallocator_s *reallocator
 ) __attribute__((__nonnull__(1, 2, 5)));
 
+/**
+ * Adds an element to an array with the possibility of allocating more space.
+ *
+ * The element \p elem is added to the end of the \p target array which containing
+ * \p size elements, already. The \p capacity must not be \c NULL and point a
+ * variable holding the current maximum number of elements the array can hold.
+ *
+ * If the capacity is insufficient to hold the new element, and the optional
+ * \p reallocator is not \c NULL, an attempt increase the \p capacity is made
+ * and the new capacity is written back.
+ *
+ * @param target the target array
+ * @param size a pointer to the size of the target array
+ * @param capacity a pointer to the target array's capacity - must not be \c NULL
+ * @param elem_size the size of one element
+ * @param elem the element to add
+ * @param reallocator the array re-allocator to use, or \c NULL
+ * if re-allocation shall not happen
+ * @return zero on success, non-zero error code on failure
+ */
+#define cx_array_add(target, size, capacity, elem_size, elem, reallocator) \
+    cx_array_copy((void**)(target), size, capacity, *(size), elem, elem_size, 1, reallocator)
 
 /**
  * Swaps two array elements.