/*   
  protected-scm.cc --  implement Protected_scm
  
  source file of the GNU LilyPond music typesetter
  
  (c) 1998--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
  
 */
#include "protected-scm.hh"
#include "lily-guile.hh"
#include "main.hh"

Protected_scm::Protected_scm ()
{
  object_ = SCM_UNDEFINED;
}

Protected_scm::Protected_scm (SCM s)
{
  object_ = SCM_NIMP (s)  ? scm_gc_protect_object (s): s;
}

Protected_scm::Protected_scm (Protected_scm const &s)
{
  object_ = SCM_NIMP (s.object_) ? scm_gc_protect_object (s.object_) : s.object_;
}

Protected_scm & 
Protected_scm::operator = (SCM s)
{
  if (object_ == s)
    return *this;
  
  if (SCM_NIMP (object_))
    scm_gc_unprotect_object (object_);

  object_ =  SCM_NIMP (s) ? scm_gc_protect_object (s): s;
  return *this;
}

Protected_scm&
Protected_scm::operator = (Protected_scm const &s)
{
  return operator= (s.object_);
}


Protected_scm::~Protected_scm ()
{
  if (SCM_NIMP (object_))
    {
      scm_gc_unprotect_object (object_);
    }
}

Protected_scm::operator SCM () const
{
  return object_;
}

SCM 
Protected_scm::to_SCM () const
{
  return object_;
}
