C++ 后置运算符重载 178

参考范磊老师<<零起点学通C++>> 178 p.

#include <iostream>

using namespace std;

class num
{
public:
	num(){n = 1;cout<<"num()"<<endl;}
	~num(){cout<<"~num()"<<endl;}
	num(num &m){this->n =m.n;cout<<"num(&)"<<endl;}
	const num operator++(int o){num temp(*this);n++;return temp;}
	int get(){return n;}
protected:
	int n;
};

int main()
{
	num n;
	num a;

	cout<<n.get()<<"   "<<&n<<endl;
	cout<<a.get()<<"   "<<&a<<endl;
	a = n++;
	cout<<"----------------++n"<<endl;
	cout<<n.get()<<"   "<<&n<<endl;
	cout<<a.get()<<"   "<<&a<<endl;

	return 0;
}

result:

num()
num()
1   0x7fffffca48a0
1   0x7fffffca4890
num(&)
~num()
----------------++n
2   0x7fffffca48a0
1   0x7fffffca4890
~num()
~num()