想请教老师这个warning是什么问题：will not be visible outside of this function

Question

老师，想请教一下这个warning是因为什么导致的
event_dispatcher.h:13:26: warning: declaration of ‘struct event_loop’ will not be visible outside of this function [-Wvisibility]
void *(*init)(struct event_loop *);

event_dispatcher.h代码如下：
struct event_dispatcher {
const char *name;

void *(*init)(struct event_loop *);

// add channel event and notify dispatcher
int (*add)(struct event_loop *, struct channel *ch);

// delete channel event and notify dispatcher
int (*del)(struct event_loop *, struct channel *ch);

// update channel event and notify dispatcher
int (*update)(struct event_loop *, struct channel *ch);

// dispatcher and use event_loop callback use event_activate
int (*dispatch)(struct event_loop *, struct timeval *);

void (*clear)(struct event_loop *);

};

Answer 1

bennyhuo 2021-03-01 12:16:50

因为这个结构体前面没有定义，这里就成了函数作用域内定义的类型了，所以出了函数不可见。估计这个类型应该在其他地方有定义。

• 提问者 程序员班吉 #1

  这个结构体在包含的头文件里有定义

• bennyhuo 回复 提问者 程序员班吉 #2

  贴一下完整的代码看看