lily/music-constructor.cc

   1 /*
   2   music-constructor.cc --  implement Music_constructor
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2001--2003  Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include <map>                  // UGH.
  11 #include "warn.hh"
  12 #include "music-constructor.hh"
  13 typedef Music* (*Music_ctor) ();
  14
  15 static std::map<String,Music_ctor> *ctors_map_;
  16
  17 void
  18 add_music_ctor (String s,  Music_ctor c)
  19 {
  20   if (!ctors_map_)
  21     ctors_map_ = new std::map<String, Music_ctor>;
  22
  23  (*ctors_map_)[s] = c;
  24 }
  25
  26
  27 Music_ctor
  28 get_music_ctor (String s)
  29 {
  30   if (ctors_map_->find (s) == ctors_map_->end ())
  31     return 0;
  32
  33   return (* ctors_map_)[s];
  34 }
  35
  36 Music*
  37 make_music (String s)
  38 {
  39   Music_ctor c = get_music_ctor (s);
  40   if (!c)
  41     programming_error (String ("No constructor for music: ") + s);
  42   assert (c);
  43
  44   return (*c) ();
  45 }
  46