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--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9 #include "protected-scm.hh"
  10 #include "lily-guile.hh"
  11 #include "main.hh"
  12
  13 Protected_scm::Protected_scm ()
  14 {
  15   object_ = SCM_UNDEFINED;
  16 }
  17
  18 Protected_scm::Protected_scm (SCM s)
  19 {
  20   object_ = SCM_NIMP (s)  ? scm_gc_protect_object (s): s;
  21 }
  22
  23 Protected_scm::Protected_scm (Protected_scm const &s)
  24 {
  25   object_ = SCM_NIMP (s.object_) ? scm_gc_protect_object (s.object_) : s.object_;
  26 }
  27
  28 Protected_scm &
  29 Protected_scm::operator = (SCM s)
  30 {
  31   if (object_ == s)
  32     return *this;
  33
  34   if (SCM_NIMP (object_))
  35     scm_gc_unprotect_object (object_);
  36
  37   object_ =  SCM_NIMP (s) ? scm_gc_protect_object (s): s;
  38   return *this;
  39 }
  40
  41 Protected_scm&
  42 Protected_scm::operator = (Protected_scm const &s)
  43 {
  44   return operator= (s.object_);
  45 }
  46
  47
  48 Protected_scm::~Protected_scm ()
  49 {
  50   if (SCM_NIMP (object_))
  51     {
  52       scm_gc_unprotect_object (object_);
  53     }
  54 }
  55
  56 Protected_scm::operator SCM () const
  57 {
  58   return object_;
  59 }
  60
  61 SCM
  62 Protected_scm::to_SCM () const
  63 {
  64   return object_;
  65 }