list.cpp
上传用户:tuheem
上传日期:2007-05-01
资源大小:21889k
文件大小:2k
- // VirtualDub 2.x (Nina) - Video processing and capture application
- // Copyright (C) 1998-2001 Avery Lee, All Rights Reserved.
- //
- // 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- ///////////////////////////////////////////////////////////////////////////
- //
- // For those of you who say this looks familiar... it should. This is
- // the same linked-list style that the Amiga Exec uses, with dummy head
- // and tail nodes. It's really a very convienent way to implement
- // doubly-linked lists.
- //
- #include "list.h"
- List::List() {
- Init();
- }
- void List::Init() {
- head.next = tail.prev = 0;
- head.prev = &tail;
- tail.next = &head;
- }
- ListNode *List::RemoveHead() {
- if (head.prev->prev) {
- ListNode *t = head.prev;
- head.prev->Remove();
- return t;
- }
- return 0;
- }
- ListNode *List::RemoveTail() {
- if (tail.next->next) {
- ListNode *t = tail.next;
- tail.next->Remove();
- return t;
- }
- return 0;
- }
- void List::Take(List &from) {
- if (from.IsEmpty())
- return;
- head.prev = from.head.prev;
- tail.next = from.tail.next;
- head.prev->next = &head;
- tail.next->prev = &tail;
- from.Init();
- }