iterator.c

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/***********************************************************************
 Freeciv - Copyright (C) 1996 - A Kjeldberg, L Gregersen, P Unold
   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, 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.
***********************************************************************/
 
#ifdef HAVE_CONFIG_H
#include <fc_config.h>
#endif
 
/* utility */
#include "shared.h"
 
#include "iterator.h"
 
/*******************************************************************/
static void invalid_iter_next(struct iterator *it)
{
  /* Do nothing. */
}
 
/*******************************************************************/
static void *invalid_iter_get(const struct iterator *it)
{
  return NULL;
}
 
/*******************************************************************/
static bool invalid_iter_valid(const struct iterator *it)
{
  return FALSE;
}
 
/*******************************************************************/
struct iterator *invalid_iter_init(struct iterator *it)
{
  it->next = invalid_iter_next;
  it->get = invalid_iter_get;
  it->valid = invalid_iter_valid;
  return it;
}