sure 0.2.0 - Docs.rs

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sure

Refinement types that track their set of possible values and and propagate them through operations.
Implemented using const generics at no extra runtime cost.

This crate is in early development, expect many breaking changes.

Example

use sure::SureU8;
use sure::sure_u8::Range;
fn main() {
    // `foo` is known to be in the set {1, 2, 3}
    let foo: SureU8![1, 2, 3] = SureU8::new(2).unwrap();

    // `bar` is known to be in the set {5, 6}
    let bar: SureU8![5, 6] = SureU8::new(6).unwrap();

    // `baz` is known to be in the set {5, 10, 15, 6, 12, 18},
    // precisely because those are the only possible results
    // from multiplying an element from `foo`'s set with one from `bar`'s set.
    let baz: SureU8![5, 6, 10, 12, 15, 18] = foo * bar;

    assert_eq!(baz.inner(), 12);

    let a: SureU8![Range![4..=100]] = SureU8::new(20).unwrap();
    let b: SureU8![Range![10..=20]] = SureU8::new(12).unwrap();

    // `normalize` is a no-op on the stored value
    // the only thing it does is sort and de-duplicate the numbers stored in the type.
    let c: SureU8![Range![14..=120]] = a.strict_add(b).normalize();

    assert_eq!(c.inner(), 32);
}