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hybrid-array: make slice conversions const fn #140

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Merged
merged 1 commit into from
Sep 10, 2025
Merged

hybrid-array: make slice conversions const fn #140

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16 changes: 8 additions & 8 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -292,8 +292,8 @@ where
/// Panics if `U` is 0.
#[allow(clippy::arithmetic_side_effects)]
#[inline]
pub fn slice_as_chunks(buf: &[T]) -> (&[Self], &[T]) {
assert_ne!(U::USIZE, 0, "chunk size must be non-zero");
pub const fn slice_as_chunks(buf: &[T]) -> (&[Self], &[T]) {
assert!(U::USIZE != 0, "chunk size must be non-zero");
// Arithmetic safety: we have checked that `N::USIZE` is not zero, thus
// division always returns correct result. `tail_pos` can not be bigger than `buf.len()`,
// thus overflow on multiplication and underflow on substraction are impossible.
Expand All @@ -315,8 +315,8 @@ where
/// Panics if `U` is 0.
#[allow(clippy::arithmetic_side_effects)]
#[inline]
pub fn slice_as_chunks_mut(buf: &mut [T]) -> (&mut [Self], &mut [T]) {
assert_ne!(U::USIZE, 0, "chunk size must be non-zero");
pub const fn slice_as_chunks_mut(buf: &mut [T]) -> (&mut [Self], &mut [T]) {
assert!(U::USIZE != 0, "chunk size must be non-zero");
// Arithmetic safety: we have checked that `N::USIZE` is not zero, thus
// division always returns correct result. `tail_pos` can not be bigger than `buf.len()`,
// thus overflow on multiplication and underflow on substraction are impossible.
Expand Down Expand Up @@ -375,28 +375,28 @@ where
{
/// Transform slice to slice of core array type.
#[inline]
pub fn cast_slice_to_core(slice: &[Self]) -> &[[T; N]] {
pub const fn cast_slice_to_core(slice: &[Self]) -> &[[T; N]] {
// SAFETY: `Self` is a `repr(transparent)` newtype for `[T; N]`
unsafe { slice::from_raw_parts(slice.as_ptr().cast(), slice.len()) }
}

/// Transform mutable slice to mutable slice of core array type.
#[inline]
pub fn cast_slice_to_core_mut(slice: &mut [Self]) -> &mut [[T; N]] {
pub const fn cast_slice_to_core_mut(slice: &mut [Self]) -> &mut [[T; N]] {
// SAFETY: `Self` is a `repr(transparent)` newtype for `[T; N]`
unsafe { slice::from_raw_parts_mut(slice.as_mut_ptr().cast(), slice.len()) }
}

/// Transform slice to slice of core array type.
#[inline]
pub fn cast_slice_from_core(slice: &[[T; N]]) -> &[Self] {
pub const fn cast_slice_from_core(slice: &[[T; N]]) -> &[Self] {
// SAFETY: `Self` is a `repr(transparent)` newtype for `[T; N]`
unsafe { slice::from_raw_parts(slice.as_ptr().cast(), slice.len()) }
}

/// Transform mutable slice to mutable slice of core array type.
#[inline]
pub fn cast_slice_from_core_mut(slice: &mut [[T; N]]) -> &mut [Self] {
pub const fn cast_slice_from_core_mut(slice: &mut [[T; N]]) -> &mut [Self] {
// SAFETY: `Self` is a `repr(transparent)` newtype for `[T; N]`
unsafe { slice::from_raw_parts_mut(slice.as_mut_ptr().cast(), slice.len()) }
}
Expand Down