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 #include "protected-scm.hh"
  10 #include "lily-guile.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_) : s.object_;
  25 }
  26
  27 Protected_scm &
  28 Protected_scm::operator = (SCM s)
  29 {
  30   if (object_ == s)
  31     return *this;
  32
  33   if (SCM_NIMP (object_))
  34     scm_gc_unprotect_object (object_);
  35
  36   object_ =  SCM_NIMP (s) ? scm_gc_protect_object (s): s;
  37   return *this;
  38 }
  39
  40 Protected_scm&
  41 Protected_scm::operator = (Protected_scm const &s)
  42 {
  43   return operator= (s.object_);
  44 }
  45
  46
  47 Protected_scm::~Protected_scm ()
  48 {
  49   if (SCM_NIMP (object_))
  50     {
  51       scm_gc_unprotect_object (object_);
  52     }
  53 }
  54
  55 Protected_scm::operator SCM () const
  56 {
  57   return object_;
  58 }
  59
  60 SCM
  61 Protected_scm::to_SCM () const
  62 {
  63   return object_;
  64 }