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/*
* ksokoban - a Sokoban game for KDE
* Copyright (C) 1998 Anders Widell <d95-awi@nada.kth.se>
*
* 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 QUEUE_H
#define QUEUE_H
#include <assert.h>
template <class Type, int SizePow2>
class Queue {
private:
Type *queue_;
long head_, tail_;
public:
void clear() { head_ = tail_ = 0; }
bool empty() { return head_ == tail_; }
bool full() { return ((tail_ + 1) & ((1l<<SizePow2)-1)) == head_; }
Queue() {
queue_ = new Type[1l << SizePow2];
clear();
}
~Queue() { delete [] queue_; }
void enqueue(Type _x) {
assert(!full());
queue_[tail_] = _x;
tail_ = (tail_ + 1) & ((1l<<SizePow2)-1);
}
Type dequeue() {
assert(!empty());
Type x = queue_[head_];
head_ = (head_ + 1) & ((1l<<SizePow2)-1);
return x;
}
};
#endif /* QUEUE_H */
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