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

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

diff --git a/lily/include/grob-interface.hh b/lily/include/grob-interface.hh
index 57ee505717e3cfe6330db9abc00dd1cafb0c11ce..bde5f5263d4130091afbd44a803501ee9fc9da69 100644 (file)
--- a/lily/include/grob-interface.hh
+++ b/lily/include/grob-interface.hh
@@ -1,39 +1,71 @@
 /*
-  interface.hh -- declare Interface
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 2002--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-  (c) 2002--2007 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
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef INTERFACE_HH
 #define INTERFACE_HH
 
 #include "lily-guile.hh"
+#include "protected-scm.hh"
 
-#define DECLARE_GROB_INTERFACE() \
-  static SCM interface_symbol_;           \
-  static bool has_interface (Grob*)
-
-#define ADD_INTERFACE(cl, b, c)                                \
-  SCM cl::interface_symbol_; \
-  bool cl::has_interface (Grob *me)                            \
-  {                                                            \
-    return me->internal_has_interface (interface_symbol_);     \
-  }                                                            \
-  void cl ## _init_ifaces ()                                   \
-  {                                                            \
-    cl::interface_symbol_ = add_interface (#cl, b, c);         \
-  }                                                            \
-  ADD_SCM_INIT_FUNC (cl ## ifaces, cl ## _init_ifaces);
+class Grob;
+
+#define ADD_INTERFACE(cl, b, c)                                 \
+  Grob_interface<cl> cl ## _interface_initializer;              \
+  template <> char const *Grob_interface<cl>::cxx_name_ (#cl);  \
+  template <> char const *Grob_interface<cl>::description_ (b); \
+  template <> char const *Grob_interface<cl>::variables_ (c);
 
 SCM add_interface (char const *cxx_name,
-                   char const *descr,
-                   char const *vars);
+                   char const *descr,
+                   char const *vars);
 
 SCM ly_add_interface (SCM, SCM, SCM);
 void internal_add_interface (SCM, SCM, SCM);
 SCM ly_all_grob_interfaces ();
 
+template <class Interface>
+class Grob_interface
+{
+public:
+  Grob_interface ()
+  {
+    add_scm_init_func (Grob_interface::init);
+  }
+
+private:
+  static void init ()
+  {
+    interface_symbol_ = ::add_interface (cxx_name_, description_, variables_);
+  }
+
+  template <class T>
+  friend bool has_interface(Grob *);
+
+private:
+  static Protected_scm interface_symbol_;
+  static char const *cxx_name_;
+  static char const *description_;
+  static char const *variables_;
+};
+
+template <class Interface>
+Protected_scm Grob_interface<Interface>::interface_symbol_;
+
 #endif /* INTERFACE_HH */