diff -r 747c4baed44f -r e3bb67b72d33 src/cx/list.h
--- a/src/cx/list.h	Sun Jan 26 14:37:07 2025 +0100
+++ b/src/cx/list.h	Mon Jan 27 20:27:39 2025 +0100
@@ -165,7 +165,7 @@
     /**
      * Member function for finding and optionally removing an element.
      */
-    ssize_t (*find_remove)(
+    size_t (*find_remove)(
             struct cx_list_s *list,
             const void *elem,
             bool remove
@@ -819,12 +819,12 @@
  *
  * @param list the list
  * @param elem the element to find
- * @return the index of the element or a negative
- * value when the element is not found
+ * @return the index of the element or the size of the list when the element is not found
+ * @see cxListIndexValid()
  */
 cx_attr_nonnull
 cx_attr_nodiscard
-static inline ssize_t cxListFind(
+static inline size_t cxListFind(
         const CxList *list,
         const void *elem
 ) {
@@ -832,17 +832,32 @@
 }
 
 /**
+ * Checks if the specified index is within bounds.
+ *
+ * @param list the list
+ * @param index the index
+ * @retval true if the index is within bounds
+ * @retval false if the index is out of bounds
+ */
+cx_attr_nonnull
+cx_attr_nodiscard
+static inline bool cxListIndexValid(const CxList *list, size_t index) {
+    return index < list->collection.size;
+}
+
+/**
  * Removes and returns the index of the first element that equals @p elem.
  *
  * Determining equality is performed by the list's comparator function.
  *
  * @param list the list
  * @param elem the element to find and remove
- * @return the index of the now removed element or a negative
- * value when the element is not found or could not be removed
+ * @return the index of the now removed element or the list size
+ * when the element is not found or could not be removed
+ * @see cxListIndexValid()
  */
 cx_attr_nonnull
-static inline ssize_t cxListFindRemove(
+static inline size_t cxListFindRemove(
         CxList *list,
         const void *elem
 ) {