前置 后置 ++ 运算符重载

1           前置 后置 ++ 运算符重载

1.1     自己实现int类型 MyInteger

1.2     内部维护以int数据

1.3     MyInteger myInt

1.4     myInt ++ 后置  ++myInt  前置

1.5     重载++运算符 operator++() 前置   operator++(int) 后置

1.6     前置理念 先++ 后返回自身   后置理念 先保存住原有值  内部++ 返回临时据数

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
using namespace std;

class MyInteger
{
	friend ostream& operator<<(ostream& cout, MyInteger & myInt);

public:
	MyInteger()
	{
		m_Num = 0;
	};

	//前置++重载
	MyInteger& operator++()
	{
		this->m_Num++;
		return *this;
	}

	//后置++ 重载
	MyInteger operator++(int)
	{
		//先保存目前数据
		MyInteger tmp = *this;
		m_Num++;
		return tmp;
	}
	int m_Num;
};

ostream& operator<<( ostream& cout ,MyInteger & myInt)
{
	cout << myInt.m_Num;
	return cout;
}

void test01()
{
	MyInteger myInt;
	// 前置++
	
	cout << ++(++myInt) << endl;
	cout << myInt << endl;

	//cout << myInt++ << endl; // 后置++ 

	//cout << myInt << endl;
}

int main(){

	test01();

	/*int a = 10;
	cout << ++(++a) << endl;
	cout << a << endl;*/

	system("pause");
	return EXIT_SUCCESS;
}

标签：MyInteger,后置,++,前置,operator,运算符,int,重载
来源： https://www.cnblogs.com/Malphite/p/14395454.html