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--1999 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_ = 0;
  16 }
  17
  18 Protected_scm::Protected_scm (SCM s)
  19 {
  20   object_ = s  ? scm_protect_object (s): 0;
  21 }
  22
  23 Protected_scm::Protected_scm (Protected_scm const &s)
  24 {
  25   object_ = s.object_ ? scm_protect_object (s.object_) : 0;
  26 }
  27
  28 Protected_scm &
  29 Protected_scm::operator =(SCM s)
  30 {
  31   if (object_ == s)
  32     return *this;
  33   if (object_)
  34     scm_unprotect_object(object_);
  35
  36   object_ =  s ? scm_protect_object (s): 0;
  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  (object_)
  50     {
  51       scm_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 }