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use std::io::{self, prelude::*};
pub struct BufReader<R> {
reader: io::BufReader<R>,
}
impl<R: Read> BufReader<R> {
pub fn new(f: R) -> Self {
Self {
reader: io::BufReader::new(f),
}
}
pub fn read_line<'buf>(
&mut self,
buffer: &'buf mut String,
) -> Option<io::Result<&'buf mut String>> {
buffer.clear();
self.reader
.read_line(buffer)
.map(|u| if u == 0 { None } else { Some(buffer) })
.transpose()
}
}
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