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- // This may look like C code, but it is really -*- C++ -*-
- /*
- Copyright (C) 1988 Free Software Foundation
- written by Doug Lea (dl@rocky.oswego.edu)
-
- This file is part of the GNU C++ Library. This library is free
- software; you can redistribute it and/or modify it under the terms of
- the GNU Library General Public License as published by the Free
- Software Foundation; either version 2 of the License, or (at your
- option) any later version. This library 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 Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-
- #ifndef _<T>SplayPQ_h
- #ifdef __GNUG__
- #pragma interface
- #endif
- #define _<T>SplayPQ_h 1
-
- #include "<T>.PQ.h"
- #include "<T>.SplayNode.h"
-
- class <T>SplayPQ : public <T>PQ
- {
- protected:
- <T>SplayNode* root;
-
- <T>SplayNode* leftmost();
- <T>SplayNode* rightmost();
- <T>SplayNode* pred(<T>SplayNode* t);
- <T>SplayNode* succ(<T>SplayNode* t);
- void _kill(<T>SplayNode* t);
- <T>SplayNode* _copy(<T>SplayNode* t);
-
- public:
- <T>SplayPQ();
- <T>SplayPQ(<T>SplayPQ& a);
- virtual ~<T>SplayPQ();
-
- Pix enq(<T&> item);
- <T> deq();
-
- <T>& front();
- void del_front();
-
- int contains(<T&> item);
-
- void clear();
-
- Pix first();
- Pix last();
- void next(Pix& i);
- void prev(Pix& i);
- <T>& operator () (Pix i);
- void del(Pix i);
- Pix seek(<T&> item);
-
- int OK(); // rep invariant
- };
-
-
- inline <T>SplayPQ::~<T>SplayPQ()
- {
- _kill(root);
- }
-
- inline <T>SplayPQ::<T>SplayPQ()
- {
- root = 0;
- count = 0;
- }
-
- inline <T>SplayPQ::<T>SplayPQ(<T>SplayPQ& b)
- {
- count = b.count;
- root = _copy(b.root);
- }
-
- inline Pix <T>SplayPQ::first()
- {
- return Pix(leftmost());
- }
-
- inline Pix <T>SplayPQ::last()
- {
- return Pix(rightmost());
- }
-
- inline void <T>SplayPQ::next(Pix& i)
- {
- if (i != 0) i = Pix(succ((<T>SplayNode*)i));
- }
-
- inline void <T>SplayPQ::prev(Pix& i)
- {
- if (i != 0) i = Pix(pred((<T>SplayNode*)i));
- }
-
- inline <T>& <T>SplayPQ::operator () (Pix i)
- {
- if (i == 0) error("null Pix");
- return ((<T>SplayNode*)i)->item;
- }
-
- inline void <T>SplayPQ::clear()
- {
- _kill(root);
- count = 0;
- root = 0;
- }
-
- inline int <T>SplayPQ::contains(<T&> key)
- {
- return seek(key) != 0;
- }
-
- #endif
-