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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| use core::fmt; | ||
| use core::mem::{self, ManuallyDrop, MaybeUninit}; | ||
| use core::ops::{Deref, DerefMut}; | ||
| use core::ptr; | ||
| use core::slice; | ||
|
|
||
| /// An error raised when we are at capacity. | ||
| #[derive(Debug)] | ||
| #[non_exhaustive] | ||
| pub(crate) struct CapacityError; | ||
|
|
||
| impl fmt::Display for CapacityError { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| f.write_str("Out of capacity when constructing array") | ||
| } | ||
| } | ||
|
|
||
| #[cfg(feature = "std")] | ||
| impl std::error::Error for CapacityError {} | ||
|
|
||
| /// A fixed capacity vector allocated on the stack. | ||
| pub(crate) struct FixedVec<T, const N: usize> { | ||
| data: [MaybeUninit<T>; N], | ||
| len: usize, | ||
| } | ||
|
|
||
| impl<T, const N: usize> FixedVec<T, N> { | ||
| /// Construct a new empty fixed vector. | ||
| pub(crate) const fn new() -> FixedVec<T, N> { | ||
| unsafe { | ||
| FixedVec { | ||
| data: MaybeUninit::uninit().assume_init(), | ||
| len: 0, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn as_ptr(&self) -> *const T { | ||
| self.data.as_ptr() as *const T | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn as_mut_ptr(&mut self) -> *mut T { | ||
| self.data.as_mut_ptr() as *mut T | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn as_slice(&self) -> &[T] { | ||
| unsafe { slice::from_raw_parts(self.as_ptr(), self.len) } | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn as_mut_slice(&mut self) -> &mut [T] { | ||
| unsafe { slice::from_raw_parts_mut(self.as_mut_ptr(), self.len) } | ||
| } | ||
|
|
||
| /// Try to push an element onto the fixed vector. | ||
| pub(crate) fn try_push(&mut self, element: T) -> Result<(), CapacityError> { | ||
| if self.len >= N { | ||
| return Err(CapacityError); | ||
| } | ||
|
|
||
| unsafe { | ||
| ptr::write(self.as_mut_ptr().wrapping_add(self.len), element); | ||
| self.len += 1; | ||
| } | ||
|
|
||
| Ok(()) | ||
| } | ||
|
|
||
| pub(crate) fn clear(&mut self) { | ||
| if self.len == 0 { | ||
| return; | ||
| } | ||
|
|
||
| let len = mem::take(&mut self.len); | ||
|
|
||
| if mem::needs_drop::<T>() { | ||
| unsafe { | ||
| let tail = slice::from_raw_parts_mut(self.as_mut_ptr(), len); | ||
| ptr::drop_in_place(tail); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub(crate) fn into_inner(self) -> [T; N] { | ||
| assert!( | ||
| self.len == N, | ||
| "into_inner: length mismatch, expected {N} but got {}", | ||
| self.len | ||
| ); | ||
|
|
||
| // SAFETY: We've asserted that the length is initialized just above. | ||
| unsafe { | ||
| let this = ManuallyDrop::new(self); | ||
| ptr::read(this.data.as_ptr() as *const [T; N]) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<T, const N: usize> Deref for FixedVec<T, N> { | ||
| type Target = [T]; | ||
|
|
||
| #[inline] | ||
| fn deref(&self) -> &Self::Target { | ||
| self.as_slice() | ||
| } | ||
| } | ||
|
|
||
| impl<T, const N: usize> DerefMut for FixedVec<T, N> { | ||
| #[inline] | ||
| fn deref_mut(&mut self) -> &mut Self::Target { | ||
| self.as_mut_slice() | ||
| } | ||
| } | ||
|
|
||
| impl<T, const N: usize> Drop for FixedVec<T, N> { | ||
| #[inline] | ||
| fn drop(&mut self) { | ||
| self.clear() | ||
| } | ||
| } |
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