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Add as_(mut_)ptr; make as_(mut_)slice into const fn #147

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Sep 23, 2025
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Add as_(mut_)ptr; make as_(mut_)slice into const fn #147

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28 changes: 22 additions & 6 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -184,14 +184,30 @@ where
{
/// Returns a slice containing the entire array. Equivalent to `&s[..]`.
#[inline]
pub fn as_slice(&self) -> &[T] {
self.0.as_ref()
pub const fn as_slice(&self) -> &[T] {
// SAFETY: `[T]` is layout-identical to `Array<T, U>`, which is a `repr(transparent)`
// newtype for `[T; N]`.
unsafe { slice::from_raw_parts(self.as_ptr(), U::USIZE) }
}

/// Returns a mutable slice containing the entire array. Equivalent to `&mut s[..]`.
#[inline]
pub fn as_mut_slice(&mut self) -> &mut [T] {
self.0.as_mut()
pub const fn as_mut_slice(&mut self) -> &mut [T] {
// SAFETY: `[T]` is layout-identical to `Array<T, U>`, which is a `repr(transparent)`
// newtype for `[T; N]`.
unsafe { slice::from_raw_parts_mut(self.as_mut_ptr(), U::USIZE) }
}

/// Returns a pointer to the start of the array.
#[allow(trivial_casts)]
pub const fn as_ptr(&self) -> *const T {
self as *const Self as *const T
}

/// Returns a mutable pointer to the start of the array.
#[allow(trivial_casts)]
pub const fn as_mut_ptr(&mut self) -> *mut T {
self as *mut Self as *mut T
}
Comment on lines +201 to 211
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This follows the signature from the slice primitive's as_ptr method, which is what you get when you invoke it on an array due to the unsized coercion


/// Returns an iterator over the array.
Expand Down Expand Up @@ -393,7 +409,7 @@ where
/// let empty_slice_of_arrays: &Array<Array<u32, U10>, U0> = &Array([]);
/// assert!(empty_slice_of_arrays.as_flattened().is_empty());
/// ```
pub fn as_flattened(&self) -> &[T] {
pub const fn as_flattened(&self) -> &[T] {
Array::slice_as_flattened(self.as_slice())
}

Expand Down Expand Up @@ -422,7 +438,7 @@ where
/// add_5_to_all(array.as_flattened_mut());
/// assert_eq!(array, Array([Array([6, 7, 8]), Array([9, 10, 11]), Array([12, 13, 14])]));
/// ```
pub fn as_flattened_mut(&mut self) -> &mut [T] {
pub const fn as_flattened_mut(&mut self) -> &mut [T] {
Array::slice_as_flattened_mut(self.as_mut_slice())
}
}
Expand Down