运算符重载之递增运算符重载

递增运算符重载

#include <iostream>

using namespace std;

//声明类
class wood
{
	friend ostream& operator<<(ostream& cout, wood myint);

public:
	//默认构造函数将m_Num初始化为0
	wood()
	{
		m_Num = 0;
	}

	//前置递增++
	//如果不用引用，就是调用重载函数，调用完之后就销毁（因为放在栈区）
	//引用是别名，调用地址
	wood& operator++()
	{
		//先++
		this->m_Num++;

		//后返回
		return *this; //返回调用该函数的对象本身
	}

	//后置递增++
	wood operator++(int)
	{
		//先 记录当前
		wood temp = *this;

		//后 ++
		m_Num++;

		//再 返回原先
		return temp;
	}

private:
	int m_Num;
};


//重载<<运算符
ostream& operator<<(ostream& cout, wood myint)
{
	cout << myint.m_Num;
	return cout;
}


//测试函数
void test01()
{
	//测试
	wood myint;
	cout << myint << endl;
	cout << ++myint << endl;
	cout << myint++ << endl;
	cout << myint << endl;
}


int main()
{
	test01();

	return 0;
}