想请高手指点下符号&的另类用法

Question

类A & 类B
这个用法有没有个说法?名称?
CCounter CCounter::Add(const CCounter & cnt)

Answer 1

引用~

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Visual C++ enthusiast, like network programming and driver development. At present is being engaged in the WinCE/Windows Mobile platform embedded development.

Answer 2

这是引用....

当调用Add函数时,形参会引用实参,既形参与实参共享同一个内存地址. 

Answer 3

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

 unsigned GetVal()const { return m_val; } 
 void SetVal(unsigned x) {m_val = x; }
 CCounter Add(const CCounter &cnt);
private:
 unsigned m_val;
};

CCounter CCounter::Add(const CCounter & cnt)
{
 CCounter temp;
 temp.SetVal(m_val+ cnt.GetVal());
 return temp;
}

int main()
{
 CCounter counter1(1), counter2(3), counter3;//创建三个CCounter类对象
 counter3 = counter1.Add(counter2); //调用成员函数Add( )
 cout << "counter1的值是: " << counter1.GetVal() << endl;
 cout << "counter2的值是: " << counter2.GetVal() << endl;
 cout << "counter3=counter1+counter2的值是: " << counter3.GetVal() << endl;

 return 0;
}