pointers - Why should constructor of Go return address?

Question

I understand that Go doesn't have any constructors and a New func is used in its place, but according to this example.

func NewFile(fd int, name string) *File {
  if fd < 0 {
    return nil
  }
  f := File{fd, name, nil, 0}
  return &f
}

They always return &f. Why just simply returning File isn't suffice?

Update

I've tried returning the created object for a simple struct and it's fine. So, I wonder if returning an address is a standard way of constructor or something.

Thanks.

Answer 1

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