80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
// This may look like C code, but it is really -*- C++ -*-
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/*
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Copyright (C) 1988 Free Software Foundation
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written by Doug Lea (dl@rocky.oswego.edu)
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This file is part of the GNU C++ Library. This library is free
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software; you can redistribute it and/or modify it under the terms of
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the GNU Library General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version. This library is distributed in the hope
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that it will be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _<T>Bag_h
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#ifdef __GNUG__
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#pragma interface
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#endif
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#define _<T>Bag_h 1
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#include <Pix.h>
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#include "<T>.defs.h"
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class <T>Bag
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{
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protected:
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int count;
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public:
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inline virtual ~<T>Bag();
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int length(); // current number of items
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int empty();
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virtual Pix add(<T&> item) = 0; // add item; return Pix
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virtual void del(<T&> item) = 0; // delete 1 occurrence of item
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#undef remove
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virtual void remove(<T&> item); // delete all occurrences
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virtual void clear(); // delete all items
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inline virtual int contains(<T&> item); // is item in Bag?
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virtual int nof(<T&> item); // how many in Bag?
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virtual Pix first() = 0; // Pix of first item or 0
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virtual void next(Pix& i) = 0; // advance to next or 0
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virtual <T>& operator () (Pix i) = 0; // access item at i
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virtual Pix seek(<T&> item, Pix from=0); // Pix of next occurrence
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virtual int owns(Pix i); // is i a valid Pix ?
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void error(const char* msg);
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virtual int OK() = 0; // rep invariant
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};
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inline <T>Bag::~<T>Bag() {}
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inline int <T>Bag::length()
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{
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return count;
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}
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inline int <T>Bag::empty()
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{
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return count == 0;
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}
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inline int <T>Bag::contains(<T&> item)
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{
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return seek(item) != 0;
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}
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#endif
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