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use std::ops::{Index, IndexMut};
use super::circular_index;
/// Game of Life universe building blocks (a plane is a circular Vec)
///
/// This is used internally in the implementation of the Universe to allow
/// more readable and safer traversing of the universe blocks
#[derive(Debug, Clone, PartialEq)]
pub(crate) struct Plane(pub Vec<bool>);
impl Index<isize> for Plane {
type Output = bool;
fn index(&self, idx: isize) -> &bool {
let len = self.0.len() as isize;
&self.0[circular_index(idx, len)]
}
}
impl IndexMut<isize> for Plane {
fn index_mut(&mut self, idx: isize) -> &mut Self::Output {
let len = self.0.len() as isize;
&mut self.0[circular_index(idx, len)]
}
}
#[cfg(test)]
mod plane {
use super::*;
mod index {
use super::*;
#[test]
fn get_element() {
let p = Plane(vec![false, false, true, false, false]);
assert_eq!(p[0], false);
assert_eq!(p[1], false);
assert_eq!(p[3], false);
assert_eq!(p[4], false);
assert_eq!(p[-3], true);
assert_eq!(p[2], true);
assert_eq!(p[7], true);
}
}
#[cfg(test)]
mod index_mut {
use super::*;
#[test]
fn set_negative_index_element() {
let mut p = Plane(vec![false, false, false, false, false]);
p[-3] = true;
assert_eq!(p, Plane(vec![false, false, true, false, false]));
}
#[test]
fn set_element() {
let mut p = Plane(vec![false, false, false, false, false]);
p[2] = true;
assert_eq!(p, Plane(vec![false, false, true, false, false]));
}
#[test]
fn set_out_of_bound_element() {
let mut p = Plane(vec![false, false, false, false, false]);
p[7] = true;
assert_eq!(p, Plane(vec![false, false, true, false, false]));
}
}
}
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