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Add const-friendly NonZero::new_unwrap #602

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Merged
merged 4 commits into from
Jul 26, 2024
Merged

Add const-friendly NonZero::new_unwrap #602

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857d11b
Add a new_unchecked const method to NonZero
dvdplm Jun 3, 2024
cf64867
Adds const_new to NonZero<Uint<>>
dvdplm Jun 4, 2024
7f6bbb1
Rename to `new_unwrap` and tweak docs
dvdplm Jul 26, 2024
e22a2c6
Update src/non_zero.rs
dvdplm Jul 26, 2024
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14 changes: 14 additions & 0 deletions src/non_zero.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,20 @@ impl NonZero<Limb> {
}

impl<const LIMBS: usize> NonZero<Uint<LIMBS>> {
/// Creates a new non-zero integer in a const context.
/// Panics if the value is zero.
///
/// In future versions of Rust it should be possible to replace this with
/// `NonZero::new(…).unwrap()`
// TODO: Remove when `Self::new` and `CtOption::unwrap` support `const fn`
pub const fn new_unwrap(n: Uint<LIMBS>) -> Self {
if n.is_nonzero().is_true_vartime() {
Self(n)
} else {
panic!("Invalid value: zero")
}
}

/// Create a [`NonZero<Uint>`] from a [`NonZeroU8`] (const-friendly)
// TODO(tarcieri): replace with `const impl From<NonZeroU8>` when stable
pub const fn from_u8(n: NonZeroU8) -> Self {
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