mirror of https://github.com/OpenTTD/OpenTTD.git
113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file queue.h Binary heap implementation, hash implementation. */
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#ifndef QUEUE_H
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#define QUEUE_H
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#include "../../tile_type.h"
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#include "../../track_type.h"
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//#define HASH_STATS
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struct BinaryHeapNode {
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void *item;
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int priority;
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};
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/**
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* Binary Heap.
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* For information, see: http://www.policyalmanac.org/games/binaryHeaps.htm
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*/
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struct BinaryHeap {
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static const int BINARY_HEAP_BLOCKSIZE;
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static const int BINARY_HEAP_BLOCKSIZE_BITS;
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static const int BINARY_HEAP_BLOCKSIZE_MASK;
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void Init(uint max_size);
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bool Push(void *item, int priority);
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void *Pop();
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bool Delete(void *item, int priority);
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void Clear(bool free_values);
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void Free(bool free_values);
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/**
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* Get an element from the #elements.
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* @param i Element to access (starts at offset \c 1).
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* @return Value of the element.
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*/
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inline BinaryHeapNode &GetElement(uint i)
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{
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assert(i > 0);
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return this->elements[(i - 1) >> BINARY_HEAP_BLOCKSIZE_BITS][(i - 1) & BINARY_HEAP_BLOCKSIZE_MASK];
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}
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uint max_size;
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uint size;
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uint blocks; ///< The amount of blocks for which space is reserved in elements
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BinaryHeapNode **elements;
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};
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/*
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* Hash
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*/
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struct HashNode {
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TileIndex tile;
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Trackdir dir;
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void *value;
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HashNode *next;
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};
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/**
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* Generates a hash code from the given key pair. You should make sure that
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* the resulting range is clearly defined.
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*/
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typedef uint Hash_HashProc(TileIndex tile, Trackdir dir);
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struct Hash {
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/* The hash function used */
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Hash_HashProc *hash;
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/* The amount of items in the hash */
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uint size;
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/* The number of buckets allocated */
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uint num_buckets;
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/* A pointer to an array of num_buckets buckets. */
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HashNode *buckets;
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/* A pointer to an array of numbuckets booleans, which will be true if
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* there are any Nodes in the bucket */
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bool *buckets_in_use;
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void Init(Hash_HashProc *hash, uint num_buckets);
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void *Get(TileIndex tile, Trackdir dir) const;
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void *Set(TileIndex tile, Trackdir dir, void *value);
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void *DeleteValue(TileIndex tile, Trackdir dir);
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void Clear(bool free_values);
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void Delete(bool free_values);
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/**
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* Gets the current size of the hash.
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*/
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inline uint GetSize() const
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{
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return this->size;
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}
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protected:
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#ifdef HASH_STATS
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void PrintStatistics() const;
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#endif
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HashNode *FindNode(TileIndex tile, Trackdir dir, HashNode** prev_out) const;
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};
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#endif /* QUEUE_H */
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