viewvc/ccscs20/Iterator.hpp

// Iterator
//
// Douglas Thrift
//
// $Id$

#ifndef _Iterator_hpp_
#define _Iterator_hpp_

#include "NullNode.hpp"

template<typename Type>
class DoublyLinkedList;

template<typename Type>
class Iterator
{
private:
        NullNode<Type>* front;
        NullNode<Type>* back;
        NullNode<Type>* here;
public:
        Iterator(NullNode<Type>* front, NullNode<Type>* back, bool forward = true) : front(front), back(back) { here = forward ? front->getNext() : back->getPrevious(); }
        bool end(void) { return here == back; }
        bool begin(void) { return here == front; }
        Iterator<Type>& operator++() { here = here->getNext(); return *this; }
        Iterator<Type> operator++(int);
        Iterator<Type>& operator--() { here = here->getPrevious(); return *this; }
        Iterator<Type> operator--(int);
        const Type& operator*() { return here->getValue(); }
};

template<typename Type>
Iterator<Type> Iterator<Type>::operator++(int)
{
        Iterator itor(*this);

        ++*this;
        
        return itor;
}

template<typename Type>
Iterator<Type> Iterator<Type>::operator--(int)
{
        Iterator itor(*this);

        --*this;

        return itor;
}

#endif // _Iterator_hpp_
Revision:	8
Committed:	2004-05-14T11:26:01-07:00 (21 years, 1 month ago) by Douglas Thrift
File size:	1091 byte(s)
Log Message:	Alive!
#	Content
1	// Iterator
2	//
3	// Douglas Thrift
4	//
5	// $Id$
6
7	#ifndef _Iterator_hpp_
8	#define _Iterator_hpp_
9
10	#include "NullNode.hpp"
11
12	template<typename Type>
13	class DoublyLinkedList;
14
15	template<typename Type>
16	class Iterator
17	{
18	private:
19	NullNode<Type>* front;
20	NullNode<Type>* back;
21	NullNode<Type>* here;
22	public:
23	Iterator(NullNode<Type>* front, NullNode<Type>* back, bool forward = true) : front(front), back(back) { here = forward ? front->getNext() : back->getPrevious(); }
24	bool end(void) { return here == back; }
25	bool begin(void) { return here == front; }
26	Iterator<Type>& operator++() { here = here->getNext(); return *this; }
27	Iterator<Type> operator++(int);
28	Iterator<Type>& operator--() { here = here->getPrevious(); return *this; }
29	Iterator<Type> operator--(int);
30	const Type& operator*() { return here->getValue(); }
31	};
32
33	template<typename Type>
34	Iterator<Type> Iterator<Type>::operator++(int)
35	{
36	Iterator itor(*this);
37
38	++*this;
39
40	return itor;
41	}
42
43	template<typename Type>
44	Iterator<Type> Iterator<Type>::operator--(int)
45	{
46	Iterator itor(*this);
47
48	--*this;
49
50	return itor;
51	}
52
53	#endif // _Iterator_hpp_