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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-
- #ifndef _<T>Bag_h
- #ifdef __GNUG__
- #pragma interface
- #endif
- #define _<T>Bag_h 1
-
- #include <Pix.h>
- #include "<T>.defs.h"
-
- class <T>Bag
- {
- protected:
- int count;
-
- public:
- inline virtual ~<T>Bag();
-
- int length(); // current number of items
- int empty();
-
- virtual Pix add(<T&> item) = 0; // add item; return Pix
-
- virtual void del(<T&> item) = 0; // delete 1 occurrence of item
- #undef remove
- virtual void remove(<T&> item); // delete all occurrences
- virtual void clear(); // delete all items
-
- inline virtual int contains(<T&> item); // is item in Bag?
- virtual int nof(<T&> item); // how many in Bag?
-
- virtual Pix first() = 0; // Pix of first item or 0
- virtual void next(Pix& i) = 0; // advance to next or 0
-
- virtual <T>& operator () (Pix i) = 0; // access item at i
-
- virtual Pix seek(<T&> item, Pix from=0); // Pix of next occurrence
- virtual int owns(Pix i); // is i a valid Pix ?
-
- void error(const char* msg);
- virtual int OK() = 0; // rep invariant
- };
-
- inline <T>Bag::~<T>Bag() {}
-
- inline int <T>Bag::length()
- {
- return count;
- }
-
- inline int <T>Bag::empty()
- {
- return count == 0;
- }
-
- inline int <T>Bag::contains(<T&> item)
- {
- return seek(item) != 0;
- }
-
- #endif
-