/* classes: h_files */

#ifndef SCM_WEAK_LIST_H
#define SCM_WEAK_LIST_H

/* Copyright (C) 2016 Free Software Foundation, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */



#include "libguile/__scm.h"
#include "libguile/weak-vector.h"



static inline SCM
scm_i_weak_cons (SCM car, SCM cdr)
{
  return scm_cons (scm_c_make_weak_vector (1, car), cdr);
}

static inline SCM
scm_i_weak_car (SCM pair)
{
  return scm_c_weak_vector_ref (scm_car (pair), 0);
}

static inline void
scm_i_visit_weak_list (SCM *list_loc, void (*visit) (SCM))
{
  SCM in = *list_loc, out = SCM_EOL;

  while (scm_is_pair (in))
    {
      SCM car = scm_i_weak_car (in);
      SCM cdr = scm_cdr (in);

      if (!scm_is_eq (car, SCM_BOOL_F))
        {
          scm_set_cdr_x (in, out);
          out = in;
          visit (car);
        }

      in = cdr;
    }

  *list_loc = out;
}


#endif  /* SCM_WEAK_LIST_H */

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/