lily/protected-scm.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1998--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   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 "protected-scm.hh"
  21
  22 Protected_scm::Protected_scm ()
  23 {
  24   object_ = SCM_UNDEFINED;
  25 }
  26
  27 Protected_scm::Protected_scm (SCM s)
  28 {
  29   object_ = SCM_NIMP (s) ? scm_gc_protect_object (s) : s;
  30 }
  31
  32 Protected_scm::Protected_scm (Protected_scm const &s)
  33 {
  34   object_ = (SCM_NIMP (s.object_) ? scm_gc_protect_object (s.object_)
  35              : s.object_);
  36 }
  37
  38 Protected_scm::~Protected_scm ()
  39 {
  40   if (SCM_NIMP (object_))
  41     scm_gc_unprotect_object (object_);
  42 }
  43
  44 Protected_scm &
  45 Protected_scm::operator = (SCM s)
  46 {
  47   if (object_ == s)
  48     return *this;
  49
  50   if (SCM_NIMP (object_))
  51     scm_gc_unprotect_object (object_);
  52
  53   object_ = SCM_NIMP (s) ? scm_gc_protect_object (s) : s;
  54   return *this;
  55 }
  56
  57 Protected_scm &
  58 Protected_scm::operator = (Protected_scm const &s)
  59 {
  60   return operator = (s.object_);
  61 }
  62
  63 Protected_scm::operator SCM () const
  64 {
  65   return object_;
  66 }
  67
  68 SCM
  69 Protected_scm::to_SCM () const
  70 {
  71   return object_;
  72 }