Function parameters

Question

What I have to put as second parameter in this function? I need to understand the meaning of int (*fn)(const char *, const struct stat *ptr, int flag).

int 
ftw(const char *path, int (*fn)(const char *, const struct stat *ptr, int flag), 
int depth);

Thank you!!

Lou Franco · Accepted Answer · 2011-04-21 01:38:12Z

6

 int (*fn)(const char *, const struct stat *ptr, int flag)

is a pointer to a function that returns an int and takes a const char*, a const struct stat *, and an int.

If you had this function:

 int func (const char *s, const struct stat *ptr, int flag)
 {
      return 0;
 }

You could pass func as that argument.

edited Apr 21, 2011 at 1:38

answered Apr 21, 2011 at 1:32

Lou Franco

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1 Comment

Dhaivat Pandya Over a year ago

I would say it is not a function, rather, a function pointer.

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