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- // This may look like C code, but it is really -*- C++ -*-
- /*
- Copyright (C) 1988 Free Software Foundation
- written by Dirk Grunwald (grunwald@cs.uiuc.edu)
- adapted for libg++ 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>PHPQ_h
- #pragma once
- #define <T>PHPQ_h 1
-
- #include "<T>.PQ.h"
-
- #ifndef <T>PHPQIndex
- #define <T>PHPQIndex unsigned short
- #endif
-
- struct <T>PHPQNode
- {
- <T>PHPQIndex sibling;
- <T>PHPQIndex children;
- <T> item;
- char valid;
- };
-
-
- class <T>PHPQ : public <T>PQ
- {
- <T>PHPQNode* storage; // table -- freelist in storage[0].sibling
- int root;
- int size;
-
- void prealloc(int);
- int check_sibling_list(int, int);
-
- public:
-
- <T>PHPQ(int sz = DEFAULT_INITIAL_CAPACITY);
- <T>PHPQ(const <T>PHPQ&);
- ~<T>PHPQ();
-
- Pix enq(<T&> item);
- <T> deq();
-
- <T>& front();
- void del_front();
-
- int contains(<T&> item);
-
- void clear();
-
- Pix first();
- void next(Pix& i);
- <T>& operator () (Pix i);
- void del(Pix i);
- Pix seek(<T&> item);
-
- int OK(); // rep invariant
- };
-
-
- inline <T>PHPQ::~<T>PHPQ()
- {
- delete [size] storage;
- }
-
-
- inline <T> <T>PHPQ::deq()
- {
- if (count == 0) error("deq of empty PQ");
- <T> x = storage[root].item;
- del_front();
- return x;
- }
-
-
- inline <T>& <T>PHPQ::front()
- {
- if (count == 0) error("front of empty PQ");
- return storage[root].item;
- }
-
- inline int <T>PHPQ::contains(<T&> item)
- {
- return seek(item) != 0;
- }
-
- inline <T>& <T>PHPQ::operator() (Pix p)
- {
- if (p == 0) error("null Pix");
- return storage[int(p)].item;
- }
-
-
- #endif
-