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/*
* 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.
*/
#ifndef __BLI_HEAP_H__
#define __BLI_HEAP_H__
/** \file
* \ingroup bli
* \brief A min-heap / priority queue ADT
*/
struct Heap;
struct HeapNode;
typedef struct Heap Heap;
typedef struct HeapNode HeapNode;
typedef void (*HeapFreeFP)(void *ptr);
Heap *BLI_heap_new_ex(unsigned int tot_reserve) ATTR_WARN_UNUSED_RESULT;
Heap *BLI_heap_new(void) ATTR_WARN_UNUSED_RESULT;
void BLI_heap_clear(Heap *heap, HeapFreeFP ptrfreefp) ATTR_NONNULL(1);
void BLI_heap_free(Heap *heap, HeapFreeFP ptrfreefp) ATTR_NONNULL(1);
HeapNode *BLI_heap_insert(Heap *heap, float value, void *ptr) ATTR_NONNULL(1);
void BLI_heap_insert_or_update(Heap *heap, HeapNode **node_p, float value, void *ptr)
ATTR_NONNULL(1, 2);
void BLI_heap_remove(Heap *heap, HeapNode *node) ATTR_NONNULL(1, 2);
bool BLI_heap_is_empty(const Heap *heap) ATTR_NONNULL(1);
unsigned int BLI_heap_len(const Heap *heap) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
HeapNode *BLI_heap_top(const Heap *heap) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
float BLI_heap_top_value(const Heap *heap) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
void *BLI_heap_pop_min(Heap *heap) ATTR_NONNULL(1);
void BLI_heap_node_value_update(Heap *heap, HeapNode *node, float value) ATTR_NONNULL(1, 2);
void BLI_heap_node_value_update_ptr(Heap *heap, HeapNode *node, float value, void *ptr)
ATTR_NONNULL(1, 2);
/* Return the value or pointer of a heap node. */
float BLI_heap_node_value(const HeapNode *heap) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
void *BLI_heap_node_ptr(const HeapNode *heap) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
/* only for gtest */
bool BLI_heap_is_valid(const Heap *heap);
#endif /* __BLI_HEAP_H__ */
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