99 lines
2.1 KiB
C++
99 lines
2.1 KiB
C++
/*
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* Copyright 2008 Free Software Foundation, Inc.
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*
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* This software is distributed under the terms of the GNU Public License.
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* See the COPYING file in the main directory for details.
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*
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* This use of this software may be subject to additional restrictions.
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* See the LEGAL file in the main directory for details.
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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 Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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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 Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef LINKEDLISTS_H
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#define LINKEDLISTS_H
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#include <stdlib.h>
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/** This node class is used to build singly-linked lists. */
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class ListNode {
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private:
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ListNode* mNext;
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void* mData;
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public:
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ListNode* next() { return mNext; }
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void next(ListNode* wNext) { mNext=wNext; }
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void* data() { return mData; }
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void data(void* wData) { mData=wData; }
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};
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/** A fast FIFO for pointer-based storage. */
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class PointerFIFO {
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private:
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ListNode* mHead; ///< points to next item out
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ListNode* mTail; ///< points to last item in
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ListNode* mFreeList; ///< pool of previously-allocated nodes
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unsigned mSize; ///< number of items in the FIFO
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public:
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PointerFIFO()
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:mHead(NULL),mTail(NULL),mFreeList(NULL),
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mSize(0)
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{}
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unsigned size() const { return mSize; }
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/** Put an item into the FIFO. */
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void put(void* val);
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/**
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Take an item from the FIFO.
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Returns NULL for empty list.
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*/
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void* get();
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private:
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/** Allocate a new node to extend the FIFO. */
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ListNode *allocate();
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/** Release a node to the free pool after removal from the FIFO. */
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void release(ListNode* wNode);
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};
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#endif
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// vim: ts=4 sw=4
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