File: main.c

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struct file_ops {
  int (*open)(int);
};

struct dev {
  struct file_ops *ops;
};

struct dev *devs;

int my_open(int a)
{
  return a;
}

struct file_ops fops = { .open =  my_open };

int main(void)
{
  struct dev tmp[4];

  devs = &tmp;

  (devs+0)->ops = &fops;  // does not work

  assert(10 == (* devs[0].ops->open)(10));

  return 0;
}