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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 GNU CC.
-
- GNU CC is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY. No author or distributor
- accepts responsibility to anyone for the consequences of using it
- or for whether it serves any particular purpose or works at all,
- unless he says so in writing. Refer to the GNU CC General Public
- License for full details.
-
- Everyone is granted permission to copy, modify and redistribute
- GNU CC, but only under the conditions described in the
- GNU CC General Public License. A copy of this license is
- supposed to have been given to you along with GNU CC so you
- can know your rights and responsibilities. It should be in a
- file named COPYING. Among other things, the copyright notice
- and this notice must be preserved on all copies.
- */
-
-
- #ifndef _<T>PQ_h
- #pragma once
- #define _<T>PQ_h 1
-
- #include <Pix.h>
- #include "<T>.defs.h"
-
- class <T>PQ
- {
- protected:
-
- int count;
-
- public:
- int length(); // current number of items
- int empty();
-
- virtual Pix enq(<T&> item); // add item; return Pix
- virtual <T> deq(); // return & remove min
-
- virtual <T>& front(); // access min item
- virtual void del_front(); // delete min item
-
- virtual int contains(<T&> item); // is item in PQ?
-
- virtual void clear(); // delete all items
-
- virtual Pix first(); // Pix of first item or 0
- virtual void next(Pix& i); // advance to next or 0
- virtual <T>& operator () (Pix i); // access item at i
- virtual void del(Pix i); // delete item at i
- virtual int owns(Pix i); // is i a valid Pix ?
- virtual Pix seek(<T&> item); // Pix of item
-
- void error(char* msg);
- virtual int OK(); // rep invariant
- };
-
-
- inline int <T>PQ::length()
- {
- return count;
- }
-
- inline int <T>PQ::empty()
- {
- return count == 0;
- }
-
-
- #endif
-