pathfinder_frontier.h

/* BSD 3-Clause License
 *
 * Copyright © 2008-2025, Jice and the libtcod contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#pragma once
#ifndef TCOD_PATHFINDER_FRONTIER_H
#define TCOD_PATHFINDER_FRONTIER_H
 
#include <stdint.h>
 
#include "config.h"
#include "error.h"
#include "heapq.h"
 
#define TCOD_PATHFINDER_MAX_DIMENSIONS 4
 
struct TCOD_Frontier {
  int8_t ndim;
  int active_dist;
  int active_index[TCOD_PATHFINDER_MAX_DIMENSIONS];
  struct TCOD_Heap heap;
};
#ifdef __cplusplus
extern "C" {
#endif  // __cplusplus
TCOD_PUBLIC TCOD_NODISCARD struct TCOD_Frontier* TCOD_frontier_new(int ndim);
TCOD_PUBLIC void TCOD_frontier_delete(struct TCOD_Frontier* frontier);
TCOD_PUBLIC TCOD_Error TCOD_frontier_pop(struct TCOD_Frontier* frontier);
TCOD_PUBLIC TCOD_Error
TCOD_frontier_push(struct TCOD_Frontier* __restrict frontier, const int* __restrict index, int dist, int heuristic);
TCOD_PUBLIC TCOD_NODISCARD int TCOD_frontier_size(const struct TCOD_Frontier* frontier);
TCOD_PUBLIC TCOD_Error TCOD_frontier_clear(struct TCOD_Frontier* frontier);
#ifdef __cplusplus
}  // extern "C"
#endif  // __cplusplus
#endif  // TCOD_PATHFINDER_FRONTIER_H