+
+MAKE_SCHEME_CALLBACK (Push_property_iterator, once_finalization, 2);
+SCM
+Push_property_iterator::once_finalization (SCM ctx, SCM music)
+{
+ Music *mus = unsmob_music (music);
+ Context *c = unsmob_context (ctx);
+
+ SCM sym = mus->get_property ("symbol");
+ if (check_grob (mus, sym))
+ {
+ SCM grob_property_path = get_property_path (mus);
+
+ send_stream_event (c, "Revert", mus->origin (),
+ ly_symbol2scm ("symbol"), sym,
+ ly_symbol2scm ("property-path"), grob_property_path);
+ }
+ return SCM_UNSPECIFIED;
+}
+
+void
+Push_property_iterator::do_quit ()
+{
+ if (to_boolean (get_music ()->get_property ("once")))
+ {
+ SCM trans = get_outlet ()->self_scm ();
+ SCM music = get_music ()->self_scm ();
+
+ Global_context *tg = get_outlet ()->get_global_context ();
+ tg->add_finalization (scm_list_n (once_finalization_proc,
+ trans, music, SCM_UNDEFINED));
+ }
+}
+
+void
+Pop_property_iterator::process (Moment m)
+{
+ SCM sym = get_music ()->get_property ("symbol");
+
+ if (check_grob (get_music (), sym))
+ {
+ SCM grob_property_path = get_property_path (get_music ());
+
+ send_stream_event (get_outlet (), "Revert", get_music ()->origin (),
+ ly_symbol2scm ("symbol"), sym,
+ ly_symbol2scm ("property-path"), grob_property_path);
+ }
+ Simple_music_iterator::process (m);
+}
+
+IMPLEMENT_CTOR_CALLBACK (Pop_property_iterator);
+IMPLEMENT_CTOR_CALLBACK (Push_property_iterator);
+IMPLEMENT_CTOR_CALLBACK (Property_iterator);
+IMPLEMENT_CTOR_CALLBACK (Property_unset_iterator);