iterator.cpp

c++程序

//Iterator.cpp
#include "Iterator.h" 
#include "Aggregate.h" 
#include <iostream> 
using namespace std;

Iterator::Iterator() 
{
}

Iterator::~Iterator() 
{
}

ConcreteIterator::ConcreteIterator(Aggregate* ag , int idx) 
{ 
	this->_ag = ag;
	this->_idx = idx; 
}

ConcreteIterator::~ConcreteIterator() 
{
}

Object ConcreteIterator::CurrentItem() 
{ 
	return _ag->GetItem(_idx); 
}

void ConcreteIterator::First() 
{
	_idx = 0; 
}

void ConcreteIterator::Next() 
{ 
	if (_idx < _ag->GetSize()) 
		_idx++; 
}

bool ConcreteIterator::IsDone() 
{ 
	return (_idx == _ag->GetSize()); 
}