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//! Odd-value predicate for [`U384`].
use super::U384;
impl U384 {
/// Returns `true` if the value is odd (least significant bit is 1).
///
/// Checks the LSB of limb `[0]` (the least significant limb).
///
/// # Examples
///
/// ```
/// use cnfy_uint::u384::U384;
///
/// assert!(U384::ONE.is_odd());
/// assert!(!U384::ZERO.is_odd());
/// ```
#[inline]
pub fn is_odd(&self) -> bool {
self.0[0] & 1 == 1
}
}
#[cfg(test)]
mod ai_tests {
use super::*;
/// Zero is not odd.
#[test]
fn zero() {
assert!(!U384::ZERO.is_odd());
}
/// One is odd.
#[test]
fn one() {
assert!(U384::ONE.is_odd());
}
/// Two is not odd.
#[test]
fn two() {
assert!(!U384::from_be_limbs([0, 0, 0, 0, 0, 2]).is_odd());
}
/// MAX (all bits set) is odd.
#[test]
fn max() {
assert!(U384::MAX.is_odd());
}
/// is_odd is the complement of is_even.
#[test]
fn complement_of_is_even() {
let values = [U384::ZERO, U384::ONE, U384::MAX, U384::from_be_limbs([1, 0, 0, 0, 0, 3])];
for v in &values {
assert_eq!(v.is_odd(), !v.is_even());
}
}
}