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--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "protected-scm.hh"
  11
  12 Protected_scm::Protected_scm ()
  13 {
  14   object_ = SCM_UNDEFINED;
  15 }
  16
  17 Protected_scm::Protected_scm (SCM s)
  18 {
  19   object_ = SCM_NIMP (s) ? scm_gc_protect_object (s): s;
  20 }
  21
  22 Protected_scm::Protected_scm (Protected_scm const &s)
  23 {
  24   object_ = (SCM_NIMP (s.object_) ? scm_gc_protect_object (s.object_)
  25              : s.object_);
  26 }
  27
  28 Protected_scm::~Protected_scm ()
  29 {
  30   if (SCM_NIMP (object_))
  31     scm_gc_unprotect_object (object_);
  32 }
  33
  34 Protected_scm &
  35 Protected_scm::operator = (SCM s)
  36 {
  37   if (object_ == s)
  38     return *this;
  39
  40   if (SCM_NIMP (object_))
  41     scm_gc_unprotect_object (object_);
  42
  43   object_ = SCM_NIMP (s) ? scm_gc_protect_object (s) : s;
  44   return *this;
  45 }
  46
  47 Protected_scm&
  48 Protected_scm::operator = (Protected_scm const &s)
  49 {
  50   return operator = (s.object_);
  51 }
  52
  53 Protected_scm::operator SCM () const
  54 {
  55   return object_;
  56 }
  57
  58 SCM
  59 Protected_scm::to_SCM () const
  60 {
  61   return object_;
  62 }