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57 lines
1.5 KiB
57 lines
1.5 KiB
15 years ago
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/*
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* ksokoban - a Sokoban game for KDE
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* Copyright (C) 1998 Anders Widell <d95-awi@nada.kth.se>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef QUEUE_H
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#define QUEUE_H
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#include <assert.h>
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template <class Type, int SizePow2>
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class Queue {
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private:
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Type *queue_;
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long head_, tail_;
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public:
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void clear() { head_ = tail_ = 0; }
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bool empty() { return head_ == tail_; }
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bool full() { return ((tail_ + 1) & ((1l<<SizePow2)-1)) == head_; }
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Queue() {
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queue_ = new Type[1l << SizePow2];
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clear();
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}
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~Queue() { delete [] queue_; }
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void enqueue(Type _x) {
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assert(!full());
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queue_[tail_] = _x;
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tail_ = (tail_ + 1) & ((1l<<SizePow2)-1);
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}
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Type dequeue() {
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assert(!empty());
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Type x = queue_[head_];
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head_ = (head_ + 1) & ((1l<<SizePow2)-1);
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return x;
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}
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};
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#endif /* QUEUE_H */
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