C++ 学习笔记 九

重载 =（深拷贝）

#include
using namespace std;

class CNum
{
public:
	int *pNu;
public:
	CNum()
	{
	pNu=new int(100);
	}
	~CNum()
	{
	if(pNu!=NULL)
	{
	delete pNu;
	pNu=NULL;
	}
	}

public:
	CNum &operator =(CNum &num)
	{
		if(this->pNu)
	 {delete this->pNu;
	this->pNu=NULL;
	}
	this->pNu=new int;
	*this->pNu=*num.pNu;
	return *this;
	}
};

int main()
{
	CNum pnu1;
	cout<<*(pnu1.pNu)< 
单例模式
 
 
#include
using namespace std;


class CObject
{
private:
	static CObject *pob;

private:
	CObject(){};
	CObject(CObject &ob);
public:
	static CObject* getobject();



};

CObject * CObject::pob=NULL;

 CObject* CObject::getobject()
 {
	
	 if(pob==NULL)
	 {
	 pob=new CObject;
	 
	 }
	 return pob;

 }


int main()
{

	CObject* p1=CObject::getobject();
	CObject* p2=CObject::getobject();
	CObject* p3=CObject::getobject();

	system("pause");
return 0;
}
 
模板模式
 
 
 
 
#include
using namespace std;

class person
{
	
	public:
		virtual void type()=0;
	void eat()
	{
	cout<<"来一碗饭"< 
文件
 
 头文件
 
#include
using namespace std;


#pragma once      //只编译一次
//#ifndef _STUDENT_H
//#define _STUDENT_H
class student
{
	
	public:
		string name;
		int age;
public:
	student();
public:
	void show();
};
//#endif
 
源文件
 
#include
#include    //系统头文件<>
#include"student.h"//自定义头文件 ""    
#include"student.h"
using namespace std;


student::student()
{
	name="tom";
	age=12;
}

void student::show()
{

	cout<