+ TODO:
+
+ merge pending_moment and process?
+*/
+class Music_iterator : public Smob<Music_iterator>
+{
+public:
+ int print_smob (SCM, scm_print_state *) const;
+ SCM mark_smob () const;
+ static const char type_p_name_[];
+ virtual ~Music_iterator ();
+protected:
+ Moment music_length_;
+ Moment start_mom_;
+
+ DECLARE_CLASSNAME (Music_iterator);
+private:
+ Music_iterator (Music_iterator const &); // Do not define! Not copyable!
+
+public:
+ Moment music_get_length () const;
+ // music_start_mom () is calculated relative to the time where the
+ // iterator occurs in the music stream, so it will usually be
+ // non-zero only for expressions starting with grace notes.
+ Moment music_start_mom () const;
+ Music_iterator ();
+ void report_event (Music *);
+ virtual Context *get_outlet () const;
+ virtual void set_context (Context *);
+ static SCM get_static_get_iterator (Music *mus);
+ void init_context (Music *, Context *);
+ void quit ();
+ void substitute_outlet (Context *from, Context *to);
+ void descend_to_bottom_context ();
+ virtual void derived_substitute (Context *, Context *);
+ virtual Moment pending_moment () const;
+ virtual bool ok () const;
+ virtual bool run_always () const;
+ // process is called with a time relative to the iterator start, so
+ // usually the last processed moment is the same as music_get_length.
+ virtual void process (Moment until);
+ virtual void derived_mark () const;
+ virtual void construct_children ();
+ DECLARE_SCHEME_CALLBACK (constructor, ());
+ SCM get_iterator (Music *) const;
+
+ Music *get_music () const;
+protected:
+ virtual void do_quit ();
+ void descend_to_child (Context *);
+
+private:
+ Context_handle handle_;
+ Music *music_;