Add two utility functions to function_list.

include/function_list.h

@@ -31,6 +31,19 @@ libab_result libab_function_list_init(libab_function_list* list);
  */
 libab_result libab_function_list_insert(libab_function_list* list,
                                         libab_ref* function_value);
+/**
+ * Get the size of the given function list.
+ * @param list the list to get the size of.
+ * @return the size of the list.
+ */
+size_t libab_function_list_size(libab_function_list* list);
+/**
+ * Gets a value at the given index in the list.
+ * @param list the list to get a value from.
+ * @param index the index at which to get the value.
+ * @param into the reference to store the function into.
+ */
+void libab_function_list_index(libab_function_list* list, size_t index, libab_ref* into);
 /**
  * Frees the given function list.
  * @param list the list to free.

src/function_list.c

@@ -9,6 +9,14 @@ libab_result libab_function_list_insert(libab_function_list* list,
     return libab_ref_vec_insert(&list->functions, function);
 }
 
+size_t libab_function_list_size(libab_function_list* list) {
+    return list->functions.size;
+}
+
+void libab_function_list_index(libab_function_list* list, size_t index, libab_ref* into) {
+    libab_ref_vec_index(&list->functions, index, into);
+}
+
 void libab_function_list_free(libab_function_list* list) {
     libab_ref_vec_free(&list->functions);
 }