lily/protected-scm.cc

   1 /*
   2   protected-scm.cc -- implement Protected_scm
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "protected-scm.hh"
  10
  11 Protected_scm::Protected_scm ()
  12 {
  13   object_ = SCM_UNDEFINED;
  14 }
  15
  16 Protected_scm::Protected_scm (SCM s)
  17 {
  18   object_ = SCM_NIMP (s) ? scm_gc_protect_object (s) : s;
  19 }
  20
  21 Protected_scm::Protected_scm (Protected_scm const &s)
  22 {
  23   object_ = (SCM_NIMP (s.object_) ? scm_gc_protect_object (s.object_)
  24              : s.object_);
  25 }
  26
  27 Protected_scm::~Protected_scm ()
  28 {
  29   if (SCM_NIMP (object_))
  30     scm_gc_unprotect_object (object_);
  31 }
  32
  33 Protected_scm &
  34 Protected_scm::operator = (SCM s)
  35 {
  36   if (object_ == s)
  37     return *this;
  38
  39   if (SCM_NIMP (object_))
  40     scm_gc_unprotect_object (object_);
  41
  42   object_ = SCM_NIMP (s) ? scm_gc_protect_object (s) : s;
  43   return *this;
  44 }
  45
  46 Protected_scm &
  47 Protected_scm::operator = (Protected_scm const &s)
  48 {
  49   return operator = (s.object_);
  50 }
  51
  52 Protected_scm::operator SCM () const
  53 {
  54   return object_;
  55 }
  56
  57 SCM
  58 Protected_scm::to_SCM () const
  59 {
  60   return object_;
  61 }