nilist.cc
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上传日期:2015-12-11
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文件大小:4k
- /* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
- /*
- * Copyright (c) 1997 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the Daedalus Research
- * Group at the University of California Berkeley.
- * 4. Neither the name of the University nor of the Research Group may be
- * used to endorse or promote products derived from this software without
- * specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <stdlib.h>
- /*#include <unistd.h>*/
- #include "nilist.h"
- template<class T>
- T Slist<T>::get()
- {
- Tlink<T>* lnk = (Tlink<T>*) slist_base::get();
- T i = lnk->info;
- delete lnk;
- return i;
- }
- void slist_base::insert(slink *a)
- {
- count_++;
- if (last_)
- a->next_ = last_->next_;
- else
- last_ = a;
- last_->next_ = a;
- }
- #include <stdio.h>
- void slist_base::remove(slink *a, slink *prev)
- {
- remove_count_++; /* XXX */
- count_--;
- if (prev && prev->next_ != a)
- printf("In remove(): Error: prev->next!=a prev=%p a=%pn",
- reinterpret_cast<void *>(prev),
- reinterpret_cast<void *>(a) );
- if (last_ == NULL)
- return;
- if (prev == NULL)
- if (last_->next_ == a)
- prev = last_;
- else
- return;
- prev->next_ = a->next_;
- if (last_ == a) // a was last in list
- last_ = prev;
- if (last_->next_ == a) // a was only one in list
- last_ = NULL;
- }
- void slist_base::append(slink *a)
- {
- append_count_++; /* XXX */
- count_++;
- if (last_) {
- a->next_ = last_->next_;
- last_ = last_->next_ = a;
- }
- else
- last_ = a->next_ = a;
- }
- slink *slist_base::get()
- {
- count_--;
- if (last_ == 0) return NULL;
- slink * f = last_->next_;
- if (f == last_)
- last_ = 0;
- else
- last_->next_ = f->next_;
- return f;
- }
- slink *slist_base::find(int key)
- {
- slink *cur = last_;
-
- if (last_ == 0) return NULL;
- do {
- cur = cur->next_;
- if (cur->key_ == key)
- return cur;
- } while (cur != last_);
- return NULL;
- }
- slist_base_iter::slist_base_iter(slist_base &s)
- {
- cs = &s;
- ce = cs->last_;
- }
- slink *
- slist_base_iter::operator() ()
- // return 0 to indicate end of iteration
- {
- slink *ret = ce ? (ce=ce->next_) : 0;
- if (ce == cs->last_) ce = 0;
- return ret;
- }
- template<class T> T* Slist_iter<T>::operator() ()
- {
- Tlink<T> *lnk = (Tlink<T> *) slist_base_iter::operator() ();
- return lnk ? &lnk->info : 0;
- }