c++中的宏 #define _CLASSDEF(name) class name

Posted 2020-07-26 川洋

 1 #include <iostream>
 2 using namespace std;
 3 #define _CLASSDEF(name) class name;  4     typedef name  * P##name; 5     typedef name  & R##name; 6     typedef name  *  & RP##name; 7     typedef const name  * PC##name; 8     typedef const name  & RC##name
 9 _CLASSDEF(base);
10 class base
11 {
12 public:
13     base()
14     {
15     }
16     base(int _a)
17     {
18         a=_a;
19     }
20     int get()
21     {
22         return a;
23     }
24     void set(int _a)
25     {
26         a=_a;
27     }
28 private:
29     int a;
30 
31 };
32 
33 int main(int argc, char *argv[])
34 {
35     base b(10);
36     Pbase pb=&b;
37     Rbase rb=b;
38     rb.set(20);
39     cout<<b.get()<<endl;
40     cout<<pb->get()<<endl;
41     cout<<rb.get()<<endl;
42          
43 
44     return 0;
45 }