c15_05.cpp

来自「it can help you use C++ program we」· C++ 代码 · 共 42 行

// 返回this指针的间接引用
#include <iostream >
using namespace std;

class CCounter
{
public:
	CCounter():m_val(0){ }
	~CCounter(){}

	unsigned GetVal()const { return m_val; }  
	void SetVal(unsigned x) {m_val = x; }
	void Increment() { ++m_val; }
	const CCounter& operator++ (); //重载++运算符，返回this指针的间接引用

private:
	unsigned m_val;
};

const CCounter& CCounter::operator++()
{
	++m_val;
	return *this;
}

int main()
{
	CCounter counter;
	cout << "counter的值是：" << counter.GetVal() << endl;
	counter.Increment();
	cout << "调用自增函数之后，";
	cout << "counter的值是：" << counter.GetVal() << endl;
	++counter;
	cout<< "使用自增运算符++之后,";
	cout << "counter的值是：" << counter.GetVal() << endl;
	CCounter counter2 = ++counter;
	cout << "counter2的值是：" << counter2.GetVal() << endl;
	cout << "counter的值是：" << counter.GetVal() << endl;

	return 0;
}