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use crate::{Side, Dir};
use std::collections::BTreeSet;
pub trait Reflectable {
fn reflect(&self) -> Self;
}
impl Reflectable for Side {
fn reflect(&self) -> Self {
match self {
Side::White => Side::Black,
Side::Black => Side::White,
}
}
}
impl Reflectable for Dir {
fn reflect(&self) -> Self {
match self {
Dir::N => Dir::S,
Dir::E => Dir::W,
Dir::S => Dir::N,
Dir::W => Dir::E,
Dir::NE => Dir::SW,
Dir::SE => Dir::NW,
Dir::SW => Dir::NE,
Dir::NW => Dir::SE,
Dir::NNE => Dir::SSW,
Dir::NEE => Dir::SWW,
Dir::SEE => Dir::NWW,
Dir::SSE => Dir::NNW,
Dir::SSW => Dir::NNE,
Dir::SWW => Dir::NEE,
Dir::NWW => Dir::SEE,
Dir::NNW => Dir::SSE,
}
}
}
impl Reflectable for i32 {
fn reflect(&self) -> Self {
-(*self)
}
}
impl<T: Reflectable> Reflectable for Vec<T> {
fn reflect(&self) -> Self {
self.into_iter().map(|t| t.reflect()).collect()
}
}
impl<T: Reflectable> Reflectable for Option<T> {
fn reflect(&self) -> Self {
match self {
Some(t) => Some(t.reflect()),
_ => None,
}
}
}
impl<T1, T2> Reflectable for (T1, T2)
where
T1: Reflectable,
T2: Reflectable,
{
fn reflect(&self) -> Self {
(self.0.reflect(), self.1.reflect())
}
}
impl<T1, T2, T3> Reflectable for (T1, T2, T3)
where
T1: Reflectable,
T2: Reflectable,
T3: Reflectable,
{
fn reflect(&self) -> Self {
(self.0.reflect(), self.1.reflect(), self.2.reflect())
}
}
impl<T: Reflectable + Ord> Reflectable for BTreeSet<T> {
fn reflect(&self) -> Self {
self.iter().map(|x| x.reflect()).collect()
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_direction_reflection() {
assert_eq!(Dir::N, Dir::S.reflect());
assert_eq!(Dir::E, Dir::W.reflect());
assert_eq!(Dir::S, Dir::N.reflect());
assert_eq!(Dir::W, Dir::E.reflect());
assert_eq!(Dir::NE, Dir::SW.reflect());
assert_eq!(Dir::SE, Dir::NW.reflect());
assert_eq!(Dir::SW, Dir::NE.reflect());
assert_eq!(Dir::NW, Dir::SE.reflect());
assert_eq!(Dir::NNE, Dir::SSW.reflect());
assert_eq!(Dir::NEE, Dir::SWW.reflect());
assert_eq!(Dir::SEE, Dir::NWW.reflect());
assert_eq!(Dir::SSE, Dir::NNW.reflect());
assert_eq!(Dir::SSW, Dir::NNE.reflect());
assert_eq!(Dir::SWW, Dir::NEE.reflect());
assert_eq!(Dir::NWW, Dir::SEE.reflect());
assert_eq!(Dir::NNW, Dir::SSE.reflect());
}
}