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

 #include <iostream>
 using namespace std;
 #define _CLASSDEF(name) class name; \
     typedef name  * P##name;\
     typedef name  & R##name;\
     typedef name  *  & RP##name;\
     typedef const name  * PC##name;\
     typedef const name  & RC##name
 _CLASSDEF(base);
 class base
 {
 public:
     base()
     {
     }
     base(int _a)
     {
         a=_a;
     }
     int get()
     {
         return a;
     }
     void set(int _a)
     {
         a=_a;
     }
 private:
     int a;

 };

 int main(int argc, char *argv[])
 {
     base b();
     Pbase pb=&b;
     Rbase rb=b;
     rb.set();
     cout<<b.get()<<endl;
     cout<<pb->get()<<endl;
     cout<<rb.get()<<endl;

     return ;
 }