[C++知识库]C语言模拟类的宏

#include<stdio.h>

#define join_(type,func)? {func=type_func;}
#define _class(type,func) (type_func)
#define _belong_ :##:

#define A_BELONG(A,name,func) \
??????? struct A name;\
??????? join_(A,name.func)
???????
????

struct A
{
?? int (*func1)(int a);
};

int A_belong_func()
{
}

int _class(A,func1)(int a)
{
??? printf("2\n");
??? return 0;
}

int main()
{
??? //struct A a;
??? //join_(A,a.func1);
??? A_BELONG(A,a,func1)
??? a.func1(2);
??? printf("Hello world!");
??? return 0;
}