pub fn lte<A, AV, B, BV>(a: AV, b: BV) -> impl Goalwhere
A: Unify + PartialOrd<B>,
B: Unify,
AV: Into<Value<A>>,
BV: Into<Value<B>>,
Expand description
Ensure that one value is less than or equal to another.
Example:
use canrun::{unify, LVar, all, Query};
use canrun::cmp::lte;
let (x, y, z) = (LVar::new(), LVar::new(), LVar::new());
let goal = all![
unify(x, 1),
unify(y, 2),
unify(z, 2),
lte(x, y),
lte(y, z),
];
let results: Vec<_> = goal.query((x, y, z)).collect();
assert_eq!(results, vec![(1, 2, 2)]);