C++——调用优化

原始代码

 1 #include<iostream>
 2 using namespace std;
 3 class Test {
 4 public:
 5     //以参数列表形式对数据成员进行初始化
 6     Test(int d = 0) :data(d)
 7     {
 8         cout << "Create Test Object:" << this << endl;
 9     }
10     Test(const Test &t)
11     {
12         cout << "Copy Create Test Object:" << this << endl;
13         this->data = t.data;
14     }
15     Test& operator=(const Test &t)
16     {
17         cout << "Assign:" << this << "=" << &t << endl;
18         if (this != &t)
19         {
20             this->data = t.data;
21         }
22         return *this;
23     }
24     ~Test()
25     {
26         cout << "Free Test Object:" << this << endl;
27     }
28     int GetData()
29     {
30         return data;
31     }
32 private:
33     int data;
34 };
35 
36 Test fun(Test t)
37 {
38     int value = t.GetData();
39     Test tmp(value);
40     return tmp;
41 }
42 
43 int main(int argc, char **argv)
44 {
45     Test t1(10);
46     Test t2 ;
47     t2 = fun(t1);
48     return 0;
49 }

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