Issue 4541 (1/2) Introduce a Grob_interface class

[lilypond.git] / lily / include / grob.hh

diff --git a/lily/include/grob.hh b/lily/include/grob.hh
index 10d8c794ebeb83f2496b47c11850c1d686af7ba0..5ef37227662f5d6de3601dff4a42f42548dc9265 100644 (file)
--- a/lily/include/grob.hh
+++ b/lily/include/grob.hh
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1996--2014 Han-Wen Nienhuys
+  Copyright (C) 1996--2015 Han-Wen Nienhuys
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -30,8 +30,8 @@
 class Grob : public Smob<Grob>
 {
 public:
-  static int print_smob (SCM, SCM, scm_print_state *);
-  SCM mark_smob ();
+  int print_smob (SCM, scm_print_state *) const;
+  SCM mark_smob () const;
   static const char type_p_name_[];
   virtual ~Grob ();
 private:
@@ -148,7 +148,7 @@ public:
   /* extents */
   Interval extent (Grob *refpoint, Axis) const;
   void flush_extent_cache (Axis);
-  virtual Interval pure_height (Grob *refpoint, int start_col, int end_col);
+  virtual Interval pure_y_extent (Grob *refpoint, int start, int end);
   Interval maybe_pure_extent (Grob *refpoint, Axis, bool pure, int start, int end);
 
   /* refpoints */
@@ -175,6 +175,12 @@ public:
   static SCM internal_skylines_from_element_stencils (SCM, Axis);
 };
 
+template <class T>
+inline bool has_interface(Grob *g)
+{
+  return g && g->internal_has_interface (Grob_interface<T>::interface_symbol_);
+}
+
 /* unification */
 void uniquify (vector <Grob *> &);