用模板寫通用鏈表的方法之一

用模板寫通用鏈表方法之一

    以前老師要我們用C語言寫通用鏈表,由於是通用嘛,數據的輸入輸出就不一樣,所以得鏈表算法和數據分離開來.最近學了多態,可以用基類指針指向派生類的方式寫通用鏈表,實現起來更加方便.今天又給我們講了一個另類的模板的方法.

// ListTtest.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "Student.h"

//模板不能分多文件寫
template
class CList  
{
	class CNode
	{
	public:
		T m_Data;
		CNode *m_pLast;
		CNode *m_pNext;
	};
public:
	CList();
	~CList();

	T* Create();
	T* Add();
	void ClearList();

private:
	CNode *m_pHead;
	CNode *m_pLast;
};

template
CList::CList()
{
	m_pHead = NULL;
	m_pLast = NULL;
}

template
CList::~CList()
{
	ClearList();
}

template
T* CList::Create()
{
	if(NULL != m_pHead)
	{
		return NULL;
	}

	m_pHead = new CNode;
	if(NULL == m_pHead)
	{
		return NULL;
	}
	m_pHead->m_pNext = NULL;
	m_pHead->m_pLast = NULL;
	m_pLast = m_pHead;

	return &(m_pHead->m_Data);
}

template
T* CList::Add()
{
	if(NULL == m_pHead)
	{
		return NULL;
	}

	CNode *pNew = new CNode;
	pNew->m_pLast = m_pLast;
	pNew->m_pNext = NULL;
	
	m_pLast = pNew;

	return &(pNew->m_Data);
}

template
void CList::ClearList()
{
	CNode *pTemp = m_pHead;
	while(NULL != pTemp)
	{
		m_pHead = m_pHead->m_pNext;
		delete pTemp;
		pTemp = m_pHead;
	}
}

int main(int argc, char* argv[])
{
	//CList *pObj;    定義爲指針時，由於沒有分配空間，所以調用Create函數的時候會崩潰；可以這麼寫
	//(pObj->Create())->Input();
	
	CList *pObj = new CList;
	(pObj->Create())->Input();

	CList Obj;
	Obj.Create()->Input();
	return 0;
}

// Student.cpp: implementation of the CStudent class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Student.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CStudent::CStudent()
{
	m_szNum[0] = ' ';
	m_nAge = 0;
}

CStudent::~CStudent()
{

}

void CStudent::Input()
{
	cout<<"Please input student number:";
	cin>>m_szNum;
	cout<<"Please input student age:";
	cin>>m_nAge;

}

// Student.h: interface for the CStudent class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_STUDENT_H__E0DF041B_A9A3_46F4_B7E0_1CAA9AF3D392__INCLUDED_)
#define AFX_STUDENT_H__E0DF041B_A9A3_46F4_B7E0_1CAA9AF3D392__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class CStudent  
{
public:
	CStudent();
	~CStudent();

	void Input();
private:
	char m_szNum[20];
	int m_nAge;
};

#endif // !defined(AFX_STUDENT_H__E0DF041B_A9A3_46F4_B7E0_1CAA9AF3D392__INCLUDED_)

    記錄下老師講的知識點,方便以後回顧,又感覺自己萌萌噠!