c语言typedef

/*定义identifier为宏，指令为identifier后的一系列指令（以前认为只能是一句）*/
#define identifier replacement-list(optional)

#define PyObject_HEAD                   \
    Py_ssize_t ob_refcnt;               \
    struct _typeobject *ob_type;

typedef struct _object {
    PyObject_HEAD
} PyObject;
//相当于：
typedef struct _object {
    Py_ssize_t ob_refcnt;
    struct _typeobject *ob_type;
} PyObject;

---

#include <stdio.h>

#define T int b;int c;
typedef struct gg {
    T
} gg;
int main(int argc, char *argv[]){
    gg g = {1, 2};
    printf("%d\n", g.b);
    printf("%d\n", g.c);
    return 0;
}
输出：
1
2

---