前置后置自增自减操作

标签：c++

class Int
{
	friend ostream& operator<<(ostream& os, const Int& i);
	friend istream& operator>>(istream& is, Int& i);
	friend bool operator<(const Int& a, const Int& b);
private:
	int value;
public:
	Int():value(0){}
	Int(int val):value(val){}
	Int(const Int& i):value(i.value){}
	Int& operator=(const Int& i)
	{
		value = i.value;
		return *this;
	}
	//前置操作符重载
	Int& operator++()
	{
		++value;
		return *this;
	}
	Int& operator--()
	{
		--value;
		return *this;
	}
	//后置操作符重载
	Int operator++(int)
	{
		Int ret(*this);
		++value;
		return ret;
	}
	Int operator--(int)
	{
		Int ret(*this);
		--value;
		return ret;
	}
};

ostream& operator<<(ostream& os, const Int& i)
{
	os << i.value;
	return os;
}

istream& operator>>(istream& is, Int& i)
{
	is >> i.value;
	return is;
}

bool operator<(const Int& a, const Int& b)
{
	return a.value < b.value;
}

int main()
{
/*
	vector<Int> v;
	copy(istream_iterator<Int>(cin), istream_iterator<Int>(), back_inserter(v));
	sort(v.begin(), v.end());
	copy(v.begin(), v.end(), ostream_iterator<Int>(cout, " "));
	cout << endl;
*/
	Int v = 10;
	cout << ++v << endl;
	cout << v++ << endl;
	cout << v << endl;

	return 0;
}

前置后置自增自减操作,布布扣,bubuko.com

前置后置自增自减操作

标签：c++

原文地址：http://blog.csdn.net/yusiguyuan/article/details/38521175