Method next

0d_files/rust/bufread_iterator.rs:40–62

(&mut self)

        type Item = io::Result<Rc<String>>;

        fn next(&mut self) -> Option<Self::Item> {
            let buf = match Rc::get_mut(&mut self.buf) {
                Some(buf) => {
                    buf.clear();
                    buf
                }
                None => {
                    self.buf = new_buf();
                    Rc::make_mut(&mut self.buf)
                }
            };

            self.reader
                .read_line(buf)
                .map(|u| {
                    if u == 0 {
                        None
                    } else {
                        Some(Rc::clone(&self.buf))
                    }
                })
                .transpose()
        }
    }
}