C language Macro Definition Tips--Multiple include header file content is different

1. header file definitions such as the following:

/* Declears in "funcs.h" */

Func_1 (id_fun1_001)

Func_1 (id_fun1_002)

Func_2 (id_fun2_001)

Func_2 (id_fun2_002)

2. Include header files multiple times

#define FUNC_1 (opt) opt,

#define FUNC_2 (OPT)

Enum AAA {

#include "Funcs.h"

Id_fun1_end

};

#undef func_1

#undef func_2

#define FUNC_1 (OPT)

#define FUNC_2 (opt) opt,

Enum BBB {

#include "Funcs.h"

Id_fun2_end

};

#undef func_1

#undef func_2

Such After translating the macro. The two enums we define are, for example, the following

Enum AAA {

ID_FUN1_001,

ID_FUN1_002,

Id_fun1_end

};

Enum BBB {

ID_FUN2_001,

ID_FUN2_002,

Id_fun2_end

};

C language Macro Definition Tips--Multiple include header file content is different