lily/scheme-listener-scheme.cc

   1 /*
   2   scheme-listener-scheme.cc -- Connect listeners to Scheme through Scheme_listener
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2006--2007 Erik Sandberg  <mandolaerik@gmail.com>
   7 */
   8
   9 #include "scheme-listener.hh"
  10
  11 LY_DEFINE (ly_make_listener, "ly:make-listener",
  12            1, 0, 0, (SCM callback),
  13            "Create a listener.  Any time the listener hears an object,"
  14            " it will call @var{callback} with that object.\n"
  15            "\n"
  16            "@var{callback} should take exactly one argument.")
  17 {
  18   LY_ASSERT_TYPE (ly_is_procedure, callback, 1);
  19   Scheme_listener *l = new Scheme_listener (callback);
  20   SCM listener = GET_LISTENER (l->call).smobbed_copy ();
  21   l->unprotect ();
  22   return listener;
  23 }