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extern crate iterslide;
extern crate itertools;
use std::io::{Read, BufRead, BufReader};
pub fn visit<R: Read, F: FnMut(&str, &str)>(r: R, mut f: F) {
use iterslide::SlideIterator;
use itertools::Itertools;
BufReader::new(r)
.lines()
.map(|r| r.ok())
.fuse()
.map(|o| o.unwrap())
.slide(2)
.foreach(|s| f(s.get(0).unwrap(), s.get(1).unwrap()));
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test() {
let mut seen = vec![];
let input = "aa\nbb\ncc\ndd";
{
let collector = |a: &str, b: &str| { seen.push((a.to_owned(), b.to_owned())); };
visit(std::io::Cursor::new(input), collector);
}
assert_eq!(
seen,
vec![
("aa".into(), "bb".into()),
("bb".into(), "cc".into()),
("cc".into(), "dd".into()),
]
);
}
}