lily/scheme-listener-scheme.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2006--2010 Erik Sandberg  <mandolaerik@gmail.com>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "scheme-listener.hh"
  21
  22 LY_DEFINE (ly_make_listener, "ly:make-listener",
  23            1, 0, 0, (SCM callback),
  24            "Create a listener.  Any time the listener hears an object,"
  25            " it will call @var{callback} with that object.\n"
  26            "\n"
  27            "@var{callback} should take exactly one argument.")
  28 {
  29   LY_ASSERT_TYPE (ly_is_procedure, callback, 1);
  30   Scheme_listener *l = new Scheme_listener (callback);
  31   SCM listener = GET_LISTENER (l->call).smobbed_copy ();
  32   l->unprotect ();
  33   return listener;
  34 }