C++ 后置运算符重载 180P

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本文详细介绍了C++中类的定义、构造函数、析构函数、成员变量和成员函数，以及如何实现运算符重载。通过实例演示了如何创建一个简单的数值类，并实现了加法运算符的重载。

参考范磊老师<<零起点学通C++>> 180P

#include <iostream>

using namespace std;

class num
{
public:
	num(){n = 0;cout<<"num()"<<endl;}
	num(int i){n = i;cout<<"num("<<i<<")"<<endl;}

	num(const num &m){cout<<"num(&)"<<endl;n = m.n;}
	~num(){cout<<"~num()"<<endl;}
	int get()const{return n;}

	num operator+(num &r){ cout<<"operator +"<<endl;return num(n+r.get());}
private:
	int n;
};

int main()
{
	num one(1),two(2),three;
	cout<<"--------------------"<<endl;
	three = one + two;
	cout<<"++++++++++++++++++++"<<endl;
	cout<<" one : "<<one.get()<<endl;
	cout<<" two : "<<two.get()<<endl;
	cout<<" three : "<<three.get()<<endl;
	return 0;
}

result:
num(1)
num(2)
num()
--------------------
operator +
num(3)
~num()
++++++++++++++++++++
one : 1
two : 2
three : 3
~num()
~num()
~num()