1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
//! Zero-value predicate for [`U384`].
use super::U384;
impl U384 {
/// Returns `true` if all six limbs are zero.
///
/// # Examples
///
/// ```
/// use cnfy_uint::u384::U384;
///
/// assert!(U384::ZERO.is_zero());
/// assert!(!U384::ONE.is_zero());
/// ```
#[inline]
pub const fn is_zero(&self) -> bool {
self.0[0] == 0
&& self.0[1] == 0
&& self.0[2] == 0
&& self.0[3] == 0
&& self.0[4] == 0
&& self.0[5] == 0
}
}
#[cfg(test)]
mod ai_tests {
use super::*;
/// Zero is zero.
#[test]
fn zero() {
assert!(U384::ZERO.is_zero());
}
/// One is not zero.
#[test]
fn one() {
assert!(!U384::ONE.is_zero());
}
/// MAX is not zero.
#[test]
fn max() {
assert!(!U384::MAX.is_zero());
}
/// Any single non-zero limb makes it non-zero.
#[test]
fn single_nonzero_limb() {
for i in 0..6 {
let mut limbs = [0u64; 6];
limbs[i] = 1;
assert!(!U384::from_be_limbs(limbs).is_zero());
}
}
}