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qt_cut.c
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1993-08-08
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955b
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* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
* The C++ Answer Book */
* Tony Hansen */
* All rights reserved. */
include <process.h>
include <debug.h> /* DELETE */
/ Change
/ old_queue_head -- old_queue -- old_queue_tail
/ into
/ old_queue_head -- old_queue -- new_queue_tail
/ new_queue -- old_queue_tail
/ where old_queue_tail == this
/ Return new_queue_tail.
ueue_tail *queue_tail::cut()
if (debug) /*DELETE*/ cerr << "queue_tail" << this << "::cut()\n";
process_queue *oldQ = qt_queue;
queue_tail *new_tail = new queue_tail(qt_mode, oldQ->q_max);
process_queue *newQ = new_tail->qt_queue;
// put the new tail on the old queue
new_tail->qt_queue = oldQ;
oldQ->q_tail = new_tail;
// put the old tail on the new queue
newQ->q_tail = this;
qt_queue = newQ;
if (debug) /*DELETE*/ cerr << "<<<< queue_tail" << this << "::cut() <- " << new_tail << "\n";
return new_tail;