迭代器模式

【1】什么是迭代器模式？

【2】迭代器模式代码示例：

代码示例：

#include <iostream>
#include <string>
using namespace std;

class Iterator;

class Aggregate
{
public:
    virtual Iterator *createIterator() = 0;
};

class Iterator
{
public:
    virtual void first() = 0;
    virtual void next() = 0;
    virtual bool isDone() = 0;
};

class ConcreteAggregate : public Iterator
{
public:
    void first()
    {}
    void next()
    {}
    bool isDone()
    {}
};

int main()
{
    return 0;
}