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请问一下下面的宏定义应该怎么理解?它的作用是什么?
#define DEFUN(funcname, cmdname, cmdstr, helpstr) \
int funcname (struct cmd_element *, struct vty *, int, char **); \
struct cmd_element cmdname = \
{ \
cmdstr, \
funcname, \
helpstr \
}; \
int funcname \
(struct cmd_element *self, struct vty *vty, int argc, char **argv)
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