13.3.3 应用程序界面(Application Interface) 简单

//用DateMid_New类做界面 ^-^有点不够意思了，这个都还写出来有点错，自己还差点找不到

#include "datemid_new.h"
#include <iostream>
int main()
{
    DateMid_New d(2005,9,9), e(42211);
	std::cout<<d;
	std::cout<<++d<<e;
	system("pause");
	return 0;
}

　　

//DateMid_New作为应用程序界面
#ifndef HEADER_DATEMID_NEW
#define HEADER_DATEMID_NEW
#include <iostream>
class Date_new; //先声明一下Date_new类

class DateMid_New
{
     Date_new* m_p; //声明一个私有的Date_new类型的指针m_p
public:
	
	DateMid_New(const std::string s); //构造函数，参数为string
	//DateMid(const std::string s);
	DateMid_New(int n); //重载构造函数，参数为int
	DateMid_New(int y, int m, int d); //重载构造函数，参数为年月日
	DateMid_New(const Date_new& d);   //重载构造函数，参数为一个Date_new类型的引用
	~DateMid_New();  //析构函数
	
	DateMid_New operator+(int n)const; //重载运算符
	DateMid_New& operator+=(int n); //重载运符符加等，返回的类型为DateMid_New的一个地址
	DateMid_New& operator++();      //重载自加
	int operator-(DateMid_New& d)const; //重载减操作，返回一个整形
	friend std::ostream& operator<<(std::ostream& o, const DateMid_New& d);/**/
};
#endif;

　　

#include "date_new.h"
#include "datemid_new.h"
#include <iostream>

//直接去操作Date_new的构造函数

DateMid_New::DateMid_New(const std::string s):m_p(new Date_new(s)){}

DateMid_New::DateMid_New(int n):m_p(new Date_new(n)){};

DateMid_New::DateMid_New(int y, int m, int d):m_p(new Date_new(y,m,d)){};

DateMid_New::DateMid_New(const Date_new& d):m_p(new Date_new(d)){};

DateMid_New::~DateMid_New(){ delete m_p; }

DateMid_New DateMid_New::operator+(int n)const{ return *m_p + n; }

DateMid_New& DateMid_New::operator+=(int n){ *m_p + n; return *this; }

DateMid_New& DateMid_New::operator++(){ *m_p +=1; return *this; }

int DateMid_New::operator-(DateMid_New& d)const{ return *m_p - *(d.m_p); }

std::ostream& operator<<(std::ostream& o, const DateMid_New & d){
	return o<<*(d.m_p);
}