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use crate::problem::{Check, Scope};
use std::ops::Range;
#[derive(Debug)]
pub struct CountUp {
n: usize,
domain: Range<usize>,
}
impl CountUp {
pub fn new(n: usize, domain: Range<usize>) -> Self {
CountUp { n, domain }
}
}
impl Scope for CountUp {
fn size(&self) -> usize {
self.n
}
fn domain(&self) -> Vec<usize> {
self.domain.clone().collect()
}
}
impl Check for CountUp {
fn extends_sat(&self, solution: &[usize], x: usize) -> bool {
if let Some(last) = solution.last() {
x > *last
} else {
true
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::problems::utils::sat_safe;
#[test]
fn count_up_sat() {
let asc = CountUp::new(4, 0..4);
assert!(sat_safe(&asc, 0..0));
assert!(sat_safe(&asc, 0..4));
assert!(sat_safe(&asc, 2..4));
}
#[test]
fn count_up_unsat() {
let asc = CountUp::new(4, 0..4);
assert!(!sat_safe(&asc, (0..2).rev()));
assert!(!sat_safe(&asc, (0..4).rev()));
}
}