/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 */

/** \file
 * \ingroup DNA
 * \brief These structs are the foundation for all linked lists in the library system.
 *
 * Doubly-linked lists start from a ListBase and contain elements beginning
 * with Link.
 */

#pragma once

#ifdef __cplusplus
extern "C" {
#endif

/** Generic - all structs which are put into linked lists begin with this. */
typedef struct Link {
  struct Link *next, *prev;
} Link;

/** Simple subclass of Link. Use this when it is not worth defining a custom one. */
typedef struct LinkData {
  struct LinkData *next, *prev;
  void *data;
} LinkData;

/** Never change the size of this! dna_genfile.c detects pointer_size with it. */
typedef struct ListBase {
  void *first, *last;
} ListBase;

/* 8 byte alignment! */

#ifdef __cplusplus
}
#endif