Aktualizovat du6/list_ops.c

du6/list_ops.c

@@ -25,4 +25,25 @@ list_t *append_list(list_t *list1, list_t *list2) {
         memcpy(result->elements + len1, list2->elements, sizeof(list_element_t) * len2);
 
     return result;
+}
+list_t *filter_list(list_t *list, bool (*filter)(list_element_t)) {
+    if (!list || list->length == 0) return new_list(0, NULL);
+
+    list_element_t *temp = malloc(sizeof(list_element_t) * list->length);
+    if (!temp) return NULL;
+
+    size_t count = 0;
+    for (size_t i = 0; i < list->length; ++i) {
+        if (filter(list->elements[i])) {
+            temp[count++] = list->elements[i];
+        }
+    }
+
+    list_t *result = new_list(count, temp);
+    free(temp);
+    return result;
+}
+
+size_t length_list(list_t *list) {
+    return list ? list->length : 0;
 }