smallint 0.2.2

A library for optimized arbitrary precision integers.
Documentation 
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#![cfg(test)]

use crate::SmallInt;
use crate::SmallUint;

#[cfg(feature = "num-bigint")]
use num_bigint::{BigInt, BigUint, Sign};

macro_rules! conversion_tests {
    ($t:ty, $i:ident) => {
        #[test]
        fn $i() {
            let i = <$t>::MAX;
            let s = SmallInt::from(i);
            assert_eq!(<$t>::try_from(s).unwrap(), i);

            let i = <$t>::MIN;
            let s = SmallInt::from(i);
            assert_eq!(<$t>::try_from(s).unwrap(), i);
        }
    };
}

conversion_tests!(u8, test_u8);
conversion_tests!(i8, test_i8);
conversion_tests!(u16, test_u16);
conversion_tests!(i16, test_i16);
conversion_tests!(u32, test_u32);
conversion_tests!(i32, test_i32);
conversion_tests!(u64, test_u64);
conversion_tests!(i64, test_i64);
conversion_tests!(u128, test_u128);
conversion_tests!(i128, test_i128);

#[test]
#[cfg(feature = "num-bigint")]
fn test_cmp_u() {
    let i = SmallUint::from(30u32);
    let k = SmallUint::from(50u32);
    assert!(i < k);

    let i = SmallUint::from(u128::MAX);
    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    assert!(i < k);

    let i = SmallUint::from(&BigUint::new(vec![3, 9, 8, 3, 1]));
    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    assert!(i < k);
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_cmp_i() {
    let i = SmallInt::from(30u32);
    let k = SmallInt::from(50u32);
    assert!(i < k);

    let i = SmallInt::from(u128::MAX);
    let k = SmallInt::from(&BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]));
    assert!(i < k);

    let i = SmallInt::from(&BigInt::new(Sign::Plus, vec![3, 9, 8, 3, 1]));
    let k = SmallInt::from(&BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]));
    assert!(i < k);

    let i = SmallInt::from(30u32);
    let k = -SmallInt::from(50u32);
    assert!(k < i);

    let i = SmallInt::from(u128::MAX);
    let k = -SmallInt::from(&BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]));
    assert!(k < i);

    let i = SmallInt::from(&BigInt::new(Sign::Plus, vec![3, 9, 8, 3, 1]));
    let k = -SmallInt::from(&BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]));
    assert!(k < i);
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_op_add_u() {
    let i = SmallUint::from(u128::MAX);
    let k = SmallUint::from(u128::MAX);
    let q = i + k;
    assert_eq!(BigUint::from(&q), BigUint::from(u128::MAX) + u128::MAX);

    let i = SmallUint::from(u128::MAX);
    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let q = i + k;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![5, 4, 9, 3, 1, 81]) + u128::MAX
    );

    let i = SmallUint::from(&BigUint::new(vec![3, 9, 8, 3, 1]));
    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let q = i + k;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![3, 9, 8, 3, 1]) + BigUint::new(vec![5, 4, 9, 3, 1, 81])
    );
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_op_add_i() {
    let i = SmallInt::from(u128::MAX);
    let k = -SmallInt::from(u128::MAX);
    let q = i + k;
    assert_eq!(BigInt::from(&q), BigInt::from(0));

    let i = SmallInt::from(u128::MAX);
    let k = -SmallInt::from(&BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]));
    let q = i + k;
    assert_eq!(
        BigInt::from(&q),
        u128::MAX - BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81])
    );

    let i = -SmallInt::from(&BigInt::new(Sign::Plus, vec![3, 9, 8, 3, 1]));
    let k = SmallInt::from(&BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]));
    let q = i + k;
    assert_eq!(
        BigInt::from(&q),
        BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81])
            - BigInt::new(Sign::Plus, vec![3, 9, 8, 3, 1])
    );
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_op_mul_u() {
    let i = SmallUint::from(u128::MAX);
    let k = SmallUint::from(u128::MAX);
    let q = i * k;
    assert_eq!(BigUint::from(&q), BigUint::from(u128::MAX) * u128::MAX);

    let i = SmallUint::from(u32::MAX);
    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let q = i * k;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![5, 4, 9, 3, 1, 81]) * u32::MAX
    );

    let i = SmallUint::from(&BigUint::new(vec![3, 9, 8, 3, 1]));
    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let q = i * k;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![3, 9, 8, 3, 1]) * BigUint::new(vec![5, 4, 9, 3, 1, 81])
    );
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_op_mul_i() {
    let i = -SmallInt::from(u128::MAX);
    let k = SmallInt::from(u128::MAX);
    let q = i * k;
    assert_eq!(BigInt::from(&q), -BigInt::from(u128::MAX) * u128::MAX);

    let i = -SmallInt::from(u32::MAX);
    let k = -SmallInt::from(&BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]));
    let q = i * k;
    assert_eq!(
        BigInt::from(&q),
        BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]) * u32::MAX
    );

    let i = -SmallInt::from(&BigInt::new(Sign::Plus, vec![3, 9, 8, 3, 1]));
    let k = SmallInt::from(&BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]));
    let q = i * k;
    assert_eq!(
        BigInt::from(&q),
        BigInt::new(Sign::Plus, vec![3, 9, 8, 3, 1])
            * -BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81])
    );
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_op_sub_u() {
    let i = SmallUint::from(u128::MAX);
    let k = SmallUint::from(u128::MAX);
    let q = i - k;
    assert_eq!(BigUint::from(&q), BigUint::from(u128::MAX) - u128::MAX);

    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let i = SmallUint::from(u128::MAX);
    let q = k - i;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![5, 4, 9, 3, 1, 81]) - u128::MAX
    );

    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let i = SmallUint::from(&BigUint::new(vec![3, 9, 8, 3, 1]));
    let q = k - i;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![5, 4, 9, 3, 1, 81]) - BigUint::new(vec![3, 9, 8, 3, 1])
    );
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_op_sub_i() {
    let i = -SmallInt::from(u128::MAX);
    let k = SmallInt::from(u128::MAX);
    let q = i - k;
    assert_eq!(BigInt::from(&q), -BigInt::from(u128::MAX) - u128::MAX);

    let k = SmallInt::from(&BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]));
    let i = -SmallInt::from(u128::MAX);
    let q = k - i;
    assert_eq!(
        BigInt::from(&q),
        BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]) + u128::MAX
    );

    let k = -SmallInt::from(&BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81]));
    let i = SmallInt::from(&BigInt::new(Sign::Plus, vec![3, 9, 8, 3, 1]));
    let q = k - i;
    assert_eq!(
        BigInt::from(&q),
        -(BigInt::new(Sign::Plus, vec![5, 4, 9, 3, 1, 81])
            + BigInt::new(Sign::Plus, vec![3, 9, 8, 3, 1]))
    );
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_op_and_u() {
    let i = SmallUint::from(u128::MAX);
    let k = SmallUint::from(u128::MAX);
    let q = i & k;
    assert_eq!(
        BigUint::from(&q),
        BigUint::from(u128::MAX) & BigUint::from(u128::MAX)
    );

    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let i = SmallUint::from(u128::MAX);
    let q = k & i;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![5, 4, 9, 3]) & BigUint::from(u128::MAX)
    );

    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let i = SmallUint::from(&BigUint::new(vec![3, 9, 8, 3, 1]));
    let q = k & i;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![5, 4, 9, 3, 1, 81]) & BigUint::new(vec![3, 9, 8, 3, 1])
    );
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_op_or_u() {
    let i = SmallUint::from(u128::MAX);
    let k = SmallUint::from(u128::MAX);
    let q = i | k;
    assert_eq!(
        BigUint::from(&q),
        BigUint::from(u128::MAX) | BigUint::from(u128::MAX)
    );

    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let i = SmallUint::from(u128::MAX);
    let q = k | i;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![5, 4, 9, 3, 1, 81]) | BigUint::from(u128::MAX)
    );

    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let i = SmallUint::from(&BigUint::new(vec![3, 9, 8, 3, 1]));
    let q = k | i;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![5, 4, 9, 3, 1, 81]) | BigUint::new(vec![3, 9, 8, 3, 1])
    );
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_op_xor_u() {
    let i = SmallUint::from(u128::MAX);
    let k = SmallUint::from(u128::MAX);
    let q = i ^ k;
    assert_eq!(
        BigUint::from(&q),
        BigUint::from(u128::MAX) ^ BigUint::from(u128::MAX)
    );

    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let i = SmallUint::from(u128::MAX);
    let q = k ^ i;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![5, 4, 9, 3, 1, 81]) ^ BigUint::from(u128::MAX)
    );

    let k = SmallUint::from(&BigUint::new(vec![5, 4, 9, 3, 1, 81]));
    let i = SmallUint::from(&BigUint::new(vec![3, 9, 8, 3, 1]));
    let q = k ^ i;
    assert_eq!(
        BigUint::from(&q),
        BigUint::new(vec![5, 4, 9, 3, 1, 81]) ^ BigUint::new(vec![3, 9, 8, 3, 1])
    );
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_op_neg() {
    let i = SmallInt::from(u128::MAX);
    let q = -i;
    assert_eq!(BigInt::from(&q), -BigInt::from(u128::MAX));

    let i = SmallInt::from(i64::MIN);
    let q = -i;
    assert_eq!(BigInt::from(&q), -BigInt::from(i64::MIN));
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_conversion_sign_drop() {
    let si = SmallInt::from(i128::MIN + 1);
    let i = SmallUint::from_smallint_unsigned(si);
    assert_eq!(BigUint::from(&i), BigUint::from(-(i128::MIN + 1) as u128))
}

#[test]
#[cfg(feature = "num-bigint")]
fn test_bigint() {
    let i = BigInt::new(Sign::Plus, vec![5, 4, 8, 3, 2, 9, 3]);
    let s = SmallInt::from(&i);
    assert_eq!(
        BigInt::from(&s).to_u32_digits(),
        (Sign::Plus, vec![5, 4, 8, 3, 2, 9, 3])
    );
}