Issue 5167/6: Changes: show \markup xxx = ... \etc assignments

[lilypond.git] / lily / include / music-iterator.hh

diff --git a/lily/include/music-iterator.hh b/lily/include/music-iterator.hh
index cf7d640626aacee684fb76282b7244a977b64c80..bb095df71869e84bbd25d84042cd30adab580e79 100644 (file)
--- a/lily/include/music-iterator.hh
+++ b/lily/include/music-iterator.hh
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1997--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -43,10 +43,10 @@
    ok () -- events left ?
 
    pending_mom () -- time tag of the next event to be processed.
-   PRECONDITION: this->ok () holds.
+   PRECONDITION: ok () holds.
 
    process (M) -- process all at M (Precondition: no events exist
-   before M, this->ok () holds).  Side-effects:
+   before M, ok () holds).  Side-effects:
 
    * This removes all events at M from the pending queue.
 
@@ -61,19 +61,23 @@
 class Music_iterator : public Smob<Music_iterator>
 {
 public:
-  static int print_smob (SCM, SCM, scm_print_state *);
-  static SCM mark_smob (SCM);
-  static const char type_p_name_[];
+  int print_smob (SCM, scm_print_state *) const;
+  SCM mark_smob () const;
+  static const char * const type_p_name_;
   virtual ~Music_iterator ();
 protected:
   Moment music_length_;
   Moment start_mom_;
 
   DECLARE_CLASSNAME (Music_iterator);
-  Music_iterator (Music_iterator const &);
+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 *);
@@ -88,6 +92,8 @@ public:
   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 ();