网站开发数据库设计的作用,网站建设五行属什么,网站建立基本流程,男生和女生做污的事情免费网站迭代器模式 C
#include iostream
#include string
#include vectorusing namespace std;// 迭代抽象类,用于定义得到开始对象、得到下一个对象、判断是否到结尾、当前对象等抽象方法#xff0c;统一接口
class Iterator
{
public:Iterator(){};virtu…迭代器模式 C
#include iostream
#include string
#include vectorusing namespace std;// 迭代抽象类,用于定义得到开始对象、得到下一个对象、判断是否到结尾、当前对象等抽象方法统一接口
class Iterator
{
public:Iterator(){};virtual ~Iterator(){};virtual string First() 0;virtual string Next() 0;virtual string CurrentItem() 0;virtual bool IsDone() 0;
};// 聚集抽象类
class Aggregate
{
public:virtual int Count() 0;virtual void Push(const string strValue) 0;virtual string Pop(const int nIndex) 0;virtual Iterator *CreateIterator() 0;
};// 具体迭代器类继承Iterator 实现开始、下一个、是否结尾、当前对象等方法
class ConcreteIterator : public Iterator
{
public:ConcreteIterator(Aggregate *pAggregate) : m_nCurrent(0), Iterator(){m_Aggregate pAggregate;}string First(){return m_Aggregate-Pop(0);}string Next(){string strRet;m_nCurrent;if (m_nCurrent m_Aggregate-Count()){strRet m_Aggregate-Pop(m_nCurrent);}return strRet;}string CurrentItem(){return m_Aggregate-Pop(m_nCurrent);}bool IsDone(){return ((m_nCurrent m_Aggregate-Count()) ? true : false);}private:Aggregate *m_Aggregate;int m_nCurrent;
};// 具体聚集类 继承
class ConcreteAggregate : public Aggregate
{
public:ConcreteAggregate() : m_pIterator(NULL){m_vecItems.clear();}~ConcreteAggregate(){if (NULL ! m_pIterator){delete m_pIterator;m_pIterator NULL;}}Iterator *CreateIterator(){if (NULL m_pIterator){m_pIterator new ConcreteIterator(this);}return m_pIterator;}int Count(){return m_vecItems.size();}void Push(const string strValue){m_vecItems.push_back(strValue);}string Pop(const int nIndex){string strRet;if (nIndex Count()){strRet m_vecItems[nIndex];}return strRet;}private:vectorstring m_vecItems;Iterator *m_pIterator;
};
int main()
{ConcreteAggregate *pName NULL;pName new ConcreteAggregate();if (NULL ! pName){pName-Push(hello);pName-Push(word);pName-Push(cxue);}Iterator *iter NULL;iter pName-CreateIterator();if (NULL ! iter){string strItem iter-First();while (!iter-IsDone()){cout iter-CurrentItem() is ok endl;iter-Next();}}return 0;
}C
#include stdio.h
#include stdlib.h
#include string.htypedef struct _Iterator
{struct _Aggregate *aggregate;int current;
} Iterator;typedef struct _Aggregate
{int count;char **items;
} Aggregate;// 创建迭代器
Iterator *Iterator_Create(Aggregate *agg)
{Iterator *it (Iterator *)malloc(sizeof(Iterator));it-aggregate agg;it-current 0;return it;
}// 释放迭代器
void Iterator_Destroy(Iterator *it)
{free(it);
}// 获取第一个元素
char *Iterator_First(Iterator *it)
{if (it it-aggregate it-aggregate-count 0){return it-aggregate-items[0];}return NULL;
}// 移动到下一个元素
char *Iterator_Next(Iterator *it)
{if (it it-aggregate it-current 0 it-current it-aggregate-count){it-current;return it-aggregate-items[it-current];}return NULL;
}// 当前元素
char *Iterator_CurrentItem(Iterator *it)
{if (it it-aggregate it-current it-aggregate-count){return it-aggregate-items[it-current];}return NULL;
}// 判断是否结束
int Iterator_IsDone(Iterator *it)
{return it-current it-aggregate-count;
}// 创建聚合
Aggregate *Aggregate_Create()
{Aggregate *agg (Aggregate *)malloc(sizeof(Aggregate));agg-count 0;agg-items NULL;return agg;
}// 销毁聚合
void Aggregate_Destroy(Aggregate *agg)
{if (agg-items){int i;for (i 0; i agg-count; i){free(agg-items[i]);}free(agg-items);}free(agg);
}// 添加元素到聚合
void Aggregate_Add(Aggregate *agg, const char *item)
{if (agg){agg-items realloc(agg-items, sizeof(char *) * (agg-count));agg-items[agg-count - 1] strdup(item);}
}int main()
{Aggregate *pName Aggregate_Create();Aggregate_Add(pName, hello);Aggregate_Add(pName, world);Aggregate_Add(pName, cxue);Iterator *iter Iterator_Create(pName);char *strItem Iterator_First(iter);while (!Iterator_IsDone(iter)){printf(%s is ok\n, Iterator_CurrentItem(iter));strItem Iterator_Next(iter);}Iterator_Destroy(iter);Aggregate_Destroy(pName);return 0;
}
