Category : OS/2 Files
Archive   : GPPDEV8F.ZIP
Filename : BAG.HP

// This may look like C code, but it is really -*- C++ -*-
/*
Copyright (C) 1988 Free Software Foundation
written by Doug Lea ([email protected])

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 _Bag_h
#ifdef __GNUG__
#pragma interface
#endif
#define _Bag_h 1

#include
#include ".defs.h"

class Bag
{
protected:
int count;

public:
virtual ~Bag();

int length(); // current number of items
int empty();

virtual Pix add( item) = 0; // add item; return Pix

virtual void del( item) = 0; // delete 1 occurrence of item
virtual void remove( item); // delete all occurrences
virtual void clear(); // delete all items

virtual int contains( item); // is item in Bag?
virtual int nof( 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 & operator () (Pix i) = 0; // access item at i

virtual Pix seek( 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 Bag::~Bag() {}

inline int Bag::length()
{
return count;
}

inline int Bag::empty()
{
return count == 0;
}

inline int Bag::contains( item)
{
return seek(item) != 0;
}

#endif