+/* Does the given notmuch_thread_ids_t object contain any more thread IDs.
+ *
+ * When this function returns TRUE, notmuch_thread_ids_get will return a
+ * valid string. Whereas when this function returns FALSE,
+ * notmuch_thread_ids_get will return NULL.
+ *
+ * See the documentation of notmuch_message_get_thread_ids for example code
+ * showing how to iterate over a notmuch_thread_ids_t object.
+ */
+notmuch_bool_t
+notmuch_thread_ids_has_more (notmuch_thread_ids_t *thread_ids);
+
+/* Get the current thread ID from 'thread_ids' as a string.
+ *
+ * Note: The returned string belongs to 'thread_ids' and has a lifetime
+ * identical to it (and the query to which it utlimately belongs).
+ *
+ * See the documentation of notmuch_message_get_thread_ids for example code
+ * showing how to iterate over a notmuch_thread_ids_t object.
+ */
+const char *
+notmuch_thread_ids_get (notmuch_thread_ids_t *thread_ids);
+
+/* Advance the 'thread_ids' iterator to the next tag.
+ *
+ * See the documentation of notmuch_message_get_thread_ids for example code
+ * showing how to iterate over a notmuch_thread_ids_t object.
+ */
+void
+notmuch_thread_ids_advance (notmuch_thread_ids_t *thread_ids);
+
+/* Destroy a notmuch_thread_ids_t object.
+ *
+ * It's not strictly necessary to call this function. All memory from
+ * the notmuch_thread_ids_t object will be reclaimed when the containg
+ * message or query objects are destroyed.
+ */
+void
+notmuch_thread_ids_destroy (notmuch_thread_ids_t *thread_ids);
+