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#[cfg(test)]
mod tests {
use super::*;
#[test]
fn decode_encode() {
let reference = vec!["thing1", "thing2", "thing3"];
assert_eq!(5, encode_bitwise(reference.clone(), decode_bitwise(reference, 5)));
}
#[test]
fn encode() {
let reference = vec!["thing1", "thing2", "thing3"];
let actual = vec!["thing1", "thing3"];
assert_eq!(5, encode_bitwise(reference, actual))
}
}
pub fn decode_bitwise<T>(i: T, n: u32) -> T
where
T: IntoIterator + std::iter::FromIterator<<T as std::iter::IntoIterator>::Item> + std::fmt::Debug,
{
i.into_iter().enumerate().filter(|(i, _x)| (1 << i) == (n & (1 << i))).map(|(_i, x)| x).collect::<T>()
}
pub fn encode_bitwise<T>(r: T, w: T) -> u32
where
T: IntoIterator,
<T as std::iter::IntoIterator>::IntoIter: std::clone::Clone,
<T as std::iter::IntoIterator>::Item: std::cmp::PartialEq
{
let ri = r.into_iter();
let mut n = 0;
w.into_iter().for_each(|x| n += 1 << ri.clone().position(|v| v == x).unwrap_or(0));
n as u32
}