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/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file queue.h Binary heap implementation, hash implementation. */
#ifndef QUEUE_H
#define QUEUE_H
//#define HASH_STATS
struct BinaryHeapNode {
void *item;
int priority;
};
/**
* Binary Heap.
* For information, see: http://www.policyalmanac.org/games/binaryHeaps.htm
*/
struct BinaryHeap {
static const int BINARY_HEAP_BLOCKSIZE;
static const int BINARY_HEAP_BLOCKSIZE_BITS;
static const int BINARY_HEAP_BLOCKSIZE_MASK;
void Init(uint max_size);
bool Push(void *item, int priority);
void *Pop();
bool Delete(void *item, int priority);
void Clear(bool free_values);
void Free(bool free_values);
/**
* Get an element from the #elements.
* @param i Element to access (starts at offset \c 1).
* @return Value of the element.
*/
inline BinaryHeapNode &GetElement(uint i)
{
assert(i > 0);
return this->elements[(i - 1) >> BINARY_HEAP_BLOCKSIZE_BITS][(i - 1) & BINARY_HEAP_BLOCKSIZE_MASK];
}
uint max_size;
uint size;
uint blocks; ///< The amount of blocks for which space is reserved in elements
BinaryHeapNode **elements;
};
/*
* Hash
*/
struct HashNode {
uint key1;
uint key2;
void *value;
HashNode *next;
};
/**
* Generates a hash code from the given key pair. You should make sure that
* the resulting range is clearly defined.
*/
typedef uint Hash_HashProc(uint key1, uint key2);
struct Hash {
/* The hash function used */
Hash_HashProc *hash;
/* The amount of items in the hash */
uint size;
/* The number of buckets allocated */
uint num_buckets;
/* A pointer to an array of num_buckets buckets. */
HashNode *buckets;
/* A pointer to an array of numbuckets booleans, which will be true if
* there are any Nodes in the bucket */
bool *buckets_in_use;
void Init(Hash_HashProc *hash, uint num_buckets);
void *Get(uint key1, uint key2) const;
void *Set(uint key1, uint key2, void *value);
void *DeleteValue(uint key1, uint key2);
void Clear(bool free_values);
void Delete(bool free_values);
/**
* Gets the current size of the hash.
*/
inline uint GetSize() const
{
return this->size;
}
protected:
#ifdef HASH_STATS
void PrintStatistics() const;
#endif
HashNode *FindNode(uint key1, uint key2, HashNode** prev_out) const;
};
#endif /* QUEUE_H */
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