标签:ConcreteIterator Iterator ConcreteAggregate int 模式 C++ Aggregate virtual nIndex
#include <iostream>
using namespace std;
typedef int DATA;
class Iterator;
// 容器的抽象基类
class Aggregate {
public:
virtual ~Aggregate(){}
virtual Iterator* CreatIterator(Aggregate *pAggregate)=0;
virtual int GetSize()=0;
virtual DATA GetItem(int nIndex)=0;
};
// 迭代器的抽象基类
class Iterator {
public:
virtual ~Iterator(){}
virtual void First()=0;
virtual void Next()=0;
virtual bool IsDone()=0;
virtual DATA CurrentItem()=0;
};
// 一个具体的容器类
class ConcreteAggregate : public Aggregate {
public:
ConcreteAggregate(int nSize);
virtual ~ConcreteAggregate();
virtual Iterator* CreatIterator(Aggregate *pAggregate);
virtual int GetSize();
virtual DATA GetItem(int nIndex);
private:
int m_nSize;
DATA *m_pData;
};
// 访问ConcreteAggregate容器的迭代器类
class ConcreteIterator : public Iterator {
public:
ConcreteIterator(Aggregate* pAggreagte);
virtual ~ConcreteIterator(){}
virtual void First();
virtual void Next();
virtual bool IsDone();
virtual DATA CurrentItem();
private:
Aggregate *m_pConcreteAggregate;
int m_nIndex;
};
// ConcreteAggregate
ConcreteAggregate::ConcreteAggregate(int nSize) : m_nSize(nSize), m_pData(NULL) {
m_pData = new DATA[m_nSize];
for (int i = 0; i < m_nSize; ++i) {
m_pData[i] = i;
}
}
ConcreteAggregate::~ConcreteAggregate() {
delete [] m_pData;
m_pData = NULL;
}
Iterator* ConcreteAggregate::CreatIterator(Aggregate *pAggregate) {
return new ConcreteIterator(this);
}
int ConcreteAggregate::GetSize() {
return m_nSize;
}
DATA ConcreteAggregate::GetItem(int nIndex) {
if (nIndex < m_nSize) {
return m_pData[nIndex];
}
else {
return -1;
}
}
// ConcreteIterator
ConcreteIterator::ConcreteIterator(Aggregate* pAggreagte) : m_pConcreteAggregate(pAggreagte), m_nIndex(0) {
}
void ConcreteIterator::First() {
m_nIndex = 0;
}
void ConcreteIterator::Next() {
if (m_nIndex < m_pConcreteAggregate->GetSize()) {
++m_nIndex;
}
}
bool ConcreteIterator::IsDone() {
return m_nIndex == m_pConcreteAggregate->GetSize();
}
DATA ConcreteIterator::CurrentItem() {
return m_pConcreteAggregate->GetItem(m_nIndex);
}
int main() {
Aggregate * pAggregate = new ConcreteAggregate(10);
for (Iterator * pIterator = new ConcreteIterator(pAggregate); !pIterator->IsDone(); pIterator->Next()) {
cout << pIterator->CurrentItem() << endl;
}
return 0;
}
标签:ConcreteIterator,Iterator,ConcreteAggregate,int,模式,C++,Aggregate,virtual,nIndex 来源: https://www.cnblogs.com/wstong/p/12831014.html
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