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/*
* Copyright (C) 2010 Regents of the University of Michigan
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef __BASICHASH_H__
#define __BASICHASH_H__
#include <stdlib.h>
class BasicHash
{
protected:
void ** objects;
unsigned int * keys;
unsigned int count, size;
unsigned int mask;
public:
BasicHash(int startsize = 32);
virtual ~BasicHash();
void Grow()
{
SetSize(size * 2);
}
void Shrink()
{
SetSize(size / 2);
}
void SetSize(int newsize);
void Clear();
int Capacity() const
{
return size;
}
int Entries() const
{
return count;
}
void * Object(int i) const
{
return objects[i];
}
void SetObject(int i, void * object)
{
objects[i] = object;
}
int Add(int key, void * object = NULL);
int Find(int key);
int Rehash(int key, int h);
BasicHash & operator = (const BasicHash & rhs);
void * operator [](int i) const
{
return objects[i];
}
void Delete(unsigned int index);
bool SlotInUse(int index)
{
return objects[index] != NULL;
}
private:
unsigned int Iterate(unsigned int key) const
{
unsigned int h = key & mask;
while (objects[h] != NULL && keys[h] != key)
h = (h + 1) & mask;
return h;
}
unsigned int ReIterate(unsigned int key, unsigned int h) const
{
h = (h + 1) & mask;
while (objects[h] != NULL && keys[h] != key)
h = (h + 1) & mask;
return h;
}
};
#endif
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