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//! Returns the four `u64` limbs in big-endian order.
use super::U256;
impl U256 {
/// Returns the four `u64` limbs in big-endian order.
///
/// The returned array is `[w0, w1, w2, w3]` where `w0` is the most
/// significant limb and `w3` is the least significant limb.
///
/// # Examples
///
/// ```
/// use cnfy_uint::u256::U256;
///
/// let v = U256::from_be_limbs([1, 2, 3, 4]);
/// assert_eq!(v.to_be_limbs(), [1, 2, 3, 4]);
/// ```
#[inline]
pub const fn to_be_limbs(&self) -> [u64; 4] {
[self.0[3], self.0[2], self.0[1], self.0[0]]
}
}
#[cfg(test)]
mod ai_tests {
use super::*;
/// Round-trip: from_be_limbs then to_be_limbs returns the original array.
#[test]
fn round_trip() {
let arr = [0xA, 0xB, 0xC, 0xD];
assert_eq!(U256::from_be_limbs(arr).to_be_limbs(), arr);
}
/// Zero round-trip.
#[test]
fn zero_round_trip() {
assert_eq!(U256::ZERO.to_be_limbs(), [0; 4]);
}
}