a1717331e4
# Objective Continuation of #17589 and #16547. `get_many` is last of the `many` methods with a missing `unique` counterpart. It both takes and returns arrays, thus necessitates a matching `UniqueEntityArray` type! Plus, some slice methods involve returning arrays, which are currently missing from `UniqueEntitySlice`. ## Solution Add the type, the related methods and trait impls. Note that for this PR, we abstain from some methods/trait impls that create `&mut UniqueEntityArray`, because it can be successfully mem-swapped. This can potentially invalidate a larger slice, which is the same reason we punted on some mutable slice methods in #17589. We can follow-up on all of these together in a following PR. The new `unique_array` module is not glob-exported, because the trait alias `unique_array::IntoIter` would conflict with `unique_vec::IntoIter`. The solution for this is to make the various `unique_*` modules public, which I intend to do in yet another PR.
544 lines
18 KiB
Rust
544 lines
18 KiB
Rust
use core::{
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array,
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borrow::{Borrow, BorrowMut},
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fmt::Debug,
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ops::{
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Bound, Deref, DerefMut, Index, IndexMut, Range, RangeFrom, RangeFull, RangeInclusive,
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RangeTo, RangeToInclusive,
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},
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ptr,
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};
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use alloc::{
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boxed::Box,
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collections::{BTreeSet, BinaryHeap, LinkedList, VecDeque},
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rc::Rc,
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sync::Arc,
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vec::Vec,
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};
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use super::{unique_slice, TrustedEntityBorrow, UniqueEntityIter, UniqueEntitySlice};
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/// An array that contains only unique entities.
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///
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/// It can be obtained through certain methods on [`UniqueEntitySlice`],
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/// and some [`TryFrom`] implementations.
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#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq, PartialOrd, Ord)]
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pub struct UniqueEntityArray<T: TrustedEntityBorrow, const N: usize>([T; N]);
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impl<T: TrustedEntityBorrow, const N: usize> UniqueEntityArray<T, N> {
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/// Constructs a `UniqueEntityArray` from a [`[T; N]`] unsafely.
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///
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/// # Safety
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///
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/// `array` must contain only unique elements.
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pub const unsafe fn from_array_unchecked(array: [T; N]) -> Self {
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Self(array)
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}
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/// Constructs a `&UniqueEntityArray` from a [`&[T; N]`] unsafely.
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///
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/// # Safety
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///
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/// `array` must contain only unique elements.
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pub const unsafe fn from_array_ref_unchecked(array: &[T; N]) -> &Self {
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// SAFETY: UniqueEntityArray is a transparent wrapper around [T; N].
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unsafe { &*(ptr::from_ref(array).cast()) }
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}
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/// Constructs a `Box<UniqueEntityArray>` from a [`Box<[T; N]>`] unsafely.
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///
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/// # Safety
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///
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/// `array` must contain only unique elements.
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pub unsafe fn from_boxed_array_unchecked(array: Box<[T; N]>) -> Box<Self> {
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// SAFETY: UniqueEntityArray is a transparent wrapper around [T; N].
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unsafe { Box::from_raw(Box::into_raw(array).cast()) }
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}
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/// Casts `self` into the inner array.
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pub fn into_boxed_inner(self: Box<Self>) -> Box<[T; N]> {
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// SAFETY: UniqueEntityArray is a transparent wrapper around [T; N].
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unsafe { Box::from_raw(Box::into_raw(self).cast()) }
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}
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/// Constructs a `Arc<UniqueEntityArray>` from a [`Arc<[T; N]>`] unsafely.
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///
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/// # Safety
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///
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/// `slice` must contain only unique elements.
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pub unsafe fn from_arc_array_unchecked(slice: Arc<[T; N]>) -> Arc<Self> {
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// SAFETY: UniqueEntityArray is a transparent wrapper around [T; N].
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unsafe { Arc::from_raw(Arc::into_raw(slice).cast()) }
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}
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/// Casts `self` to the inner array.
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pub fn into_arc_inner(self: Arc<Self>) -> Arc<[T; N]> {
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// SAFETY: UniqueEntityArray is a transparent wrapper around [T; N].
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unsafe { Arc::from_raw(Arc::into_raw(self).cast()) }
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}
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// Constructs a `Rc<UniqueEntityArray>` from a [`Rc<[T; N]>`] unsafely.
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///
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/// # Safety
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///
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/// `slice` must contain only unique elements.
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pub unsafe fn from_rc_array_unchecked(slice: Rc<[T; N]>) -> Rc<Self> {
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// SAFETY: UniqueEntityArray is a transparent wrapper around [T; N].
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unsafe { Rc::from_raw(Rc::into_raw(slice).cast()) }
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}
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/// Casts `self` to the inner array.
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pub fn into_rc_inner(self: Rc<Self>) -> Rc<[T; N]> {
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// SAFETY: UniqueEntityArray is a transparent wrapper around [T; N].
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unsafe { Rc::from_raw(Rc::into_raw(self).cast()) }
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}
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/// Return the inner array.
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pub fn into_inner(self) -> [T; N] {
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self.0
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}
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/// Returns a reference to the inner array.
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pub fn as_inner(&self) -> &[T; N] {
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&self.0
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}
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/// Returns a slice containing the entire array. Equivalent to `&s[..]`.
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pub const fn as_slice(&self) -> &UniqueEntitySlice<T> {
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// SAFETY: All elements in the original array are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked(self.0.as_slice()) }
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}
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/// Returns a mutable slice containing the entire array. Equivalent to
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/// `&mut s[..]`.
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pub fn as_mut_slice(&mut self) -> &mut UniqueEntitySlice<T> {
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// SAFETY: All elements in the original array are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked_mut(self.0.as_mut_slice()) }
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}
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/// Borrows each element and returns an array of references with the same
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/// size as `self`.
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///
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/// Equivalent to [`[T; N]::as_ref`](array::each_ref).
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pub fn each_ref(&self) -> UniqueEntityArray<&T, N> {
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UniqueEntityArray(self.0.each_ref())
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> Deref for UniqueEntityArray<T, N> {
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type Target = UniqueEntitySlice<T>;
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fn deref(&self) -> &Self::Target {
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// SAFETY: All elements in the original array are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked(&self.0) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> DerefMut for UniqueEntityArray<T, N> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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// SAFETY: All elements in the original array are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked_mut(&mut self.0) }
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}
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}
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impl<T: TrustedEntityBorrow> Default for UniqueEntityArray<T, 0> {
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fn default() -> Self {
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Self(Default::default())
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}
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}
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impl<'a, T: TrustedEntityBorrow, const N: usize> IntoIterator for &'a UniqueEntityArray<T, N> {
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type Item = &'a T;
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type IntoIter = unique_slice::Iter<'a, T>;
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fn into_iter(self) -> Self::IntoIter {
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// SAFETY: All elements in the original array are unique.
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unsafe { UniqueEntityIter::from_iterator_unchecked(self.0.iter()) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> IntoIterator for UniqueEntityArray<T, N> {
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type Item = T;
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type IntoIter = IntoIter<T, N>;
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fn into_iter(self) -> Self::IntoIter {
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// SAFETY: All elements in the original array are unique.
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unsafe { UniqueEntityIter::from_iterator_unchecked(self.0.into_iter()) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> AsRef<UniqueEntitySlice<T>>
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for UniqueEntityArray<T, N>
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{
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fn as_ref(&self) -> &UniqueEntitySlice<T> {
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self
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> AsMut<UniqueEntitySlice<T>>
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for UniqueEntityArray<T, N>
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{
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fn as_mut(&mut self) -> &mut UniqueEntitySlice<T> {
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self
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> Borrow<UniqueEntitySlice<T>>
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for UniqueEntityArray<T, N>
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{
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fn borrow(&self) -> &UniqueEntitySlice<T> {
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self
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> BorrowMut<UniqueEntitySlice<T>>
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for UniqueEntityArray<T, N>
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{
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fn borrow_mut(&mut self) -> &mut UniqueEntitySlice<T> {
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self
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> Index<(Bound<usize>, Bound<usize>)>
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for UniqueEntityArray<T, N>
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{
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type Output = UniqueEntitySlice<T>;
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fn index(&self, key: (Bound<usize>, Bound<usize>)) -> &Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked(self.0.index(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> Index<Range<usize>> for UniqueEntityArray<T, N> {
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type Output = UniqueEntitySlice<T>;
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fn index(&self, key: Range<usize>) -> &Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked(self.0.index(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> Index<RangeFrom<usize>> for UniqueEntityArray<T, N> {
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type Output = UniqueEntitySlice<T>;
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fn index(&self, key: RangeFrom<usize>) -> &Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked(self.0.index(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> Index<RangeFull> for UniqueEntityArray<T, N> {
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type Output = UniqueEntitySlice<T>;
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fn index(&self, key: RangeFull) -> &Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked(self.0.index(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> Index<RangeInclusive<usize>>
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for UniqueEntityArray<T, N>
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{
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type Output = UniqueEntitySlice<T>;
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fn index(&self, key: RangeInclusive<usize>) -> &Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked(self.0.index(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> Index<RangeTo<usize>> for UniqueEntityArray<T, N> {
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type Output = UniqueEntitySlice<T>;
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fn index(&self, key: RangeTo<usize>) -> &Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked(self.0.index(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> Index<RangeToInclusive<usize>>
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for UniqueEntityArray<T, N>
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{
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type Output = UniqueEntitySlice<T>;
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fn index(&self, key: RangeToInclusive<usize>) -> &Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked(self.0.index(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> Index<usize> for UniqueEntityArray<T, N> {
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type Output = T;
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fn index(&self, key: usize) -> &T {
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self.0.index(key)
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> IndexMut<(Bound<usize>, Bound<usize>)>
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for UniqueEntityArray<T, N>
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{
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fn index_mut(&mut self, key: (Bound<usize>, Bound<usize>)) -> &mut Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked_mut(self.0.index_mut(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> IndexMut<Range<usize>> for UniqueEntityArray<T, N> {
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fn index_mut(&mut self, key: Range<usize>) -> &mut Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked_mut(self.0.index_mut(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> IndexMut<RangeFrom<usize>>
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for UniqueEntityArray<T, N>
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{
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fn index_mut(&mut self, key: RangeFrom<usize>) -> &mut Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked_mut(self.0.index_mut(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> IndexMut<RangeFull> for UniqueEntityArray<T, N> {
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fn index_mut(&mut self, key: RangeFull) -> &mut Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked_mut(self.0.index_mut(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> IndexMut<RangeInclusive<usize>>
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for UniqueEntityArray<T, N>
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{
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fn index_mut(&mut self, key: RangeInclusive<usize>) -> &mut Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked_mut(self.0.index_mut(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> IndexMut<RangeTo<usize>> for UniqueEntityArray<T, N> {
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fn index_mut(&mut self, key: RangeTo<usize>) -> &mut Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked_mut(self.0.index_mut(key)) }
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}
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}
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impl<T: TrustedEntityBorrow, const N: usize> IndexMut<RangeToInclusive<usize>>
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for UniqueEntityArray<T, N>
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{
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fn index_mut(&mut self, key: RangeToInclusive<usize>) -> &mut Self::Output {
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// SAFETY: All elements in the original slice are unique.
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unsafe { UniqueEntitySlice::from_slice_unchecked_mut(self.0.index_mut(key)) }
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}
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}
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impl<T: TrustedEntityBorrow + Clone> From<&[T; 1]> for UniqueEntityArray<T, 1> {
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fn from(value: &[T; 1]) -> Self {
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Self(value.clone())
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}
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}
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impl<T: TrustedEntityBorrow + Clone> From<&[T; 0]> for UniqueEntityArray<T, 0> {
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fn from(value: &[T; 0]) -> Self {
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Self(value.clone())
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}
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}
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impl<T: TrustedEntityBorrow + Clone> From<&mut [T; 1]> for UniqueEntityArray<T, 1> {
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fn from(value: &mut [T; 1]) -> Self {
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Self(value.clone())
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}
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}
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impl<T: TrustedEntityBorrow + Clone> From<&mut [T; 0]> for UniqueEntityArray<T, 0> {
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fn from(value: &mut [T; 0]) -> Self {
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Self(value.clone())
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}
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}
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impl<T: TrustedEntityBorrow> From<[T; 1]> for UniqueEntityArray<T, 1> {
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fn from(value: [T; 1]) -> Self {
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Self(value)
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}
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}
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impl<T: TrustedEntityBorrow> From<[T; 0]> for UniqueEntityArray<T, 0> {
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fn from(value: [T; 0]) -> Self {
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Self(value)
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 1>> for (T,) {
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fn from(array: UniqueEntityArray<T, 1>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 2>> for (T, T) {
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fn from(array: UniqueEntityArray<T, 2>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 3>> for (T, T, T) {
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fn from(array: UniqueEntityArray<T, 3>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 4>> for (T, T, T, T) {
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fn from(array: UniqueEntityArray<T, 4>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 5>> for (T, T, T, T, T) {
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fn from(array: UniqueEntityArray<T, 5>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 6>> for (T, T, T, T, T, T) {
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fn from(array: UniqueEntityArray<T, 6>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 7>> for (T, T, T, T, T, T, T) {
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fn from(array: UniqueEntityArray<T, 7>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 8>> for (T, T, T, T, T, T, T, T) {
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fn from(array: UniqueEntityArray<T, 8>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 9>> for (T, T, T, T, T, T, T, T, T) {
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fn from(array: UniqueEntityArray<T, 9>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 10>> for (T, T, T, T, T, T, T, T, T, T) {
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fn from(array: UniqueEntityArray<T, 10>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 11>> for (T, T, T, T, T, T, T, T, T, T, T) {
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fn from(array: UniqueEntityArray<T, 11>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow> From<UniqueEntityArray<T, 12>>
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for (T, T, T, T, T, T, T, T, T, T, T, T)
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{
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fn from(array: UniqueEntityArray<T, 12>) -> Self {
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Self::from(array.into_inner())
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}
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}
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impl<T: TrustedEntityBorrow + Ord, const N: usize> From<UniqueEntityArray<T, N>> for BTreeSet<T> {
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fn from(value: UniqueEntityArray<T, N>) -> Self {
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BTreeSet::from(value.0)
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}
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}
|
|
|
|
impl<T: TrustedEntityBorrow + Ord, const N: usize> From<UniqueEntityArray<T, N>> for BinaryHeap<T> {
|
|
fn from(value: UniqueEntityArray<T, N>) -> Self {
|
|
BinaryHeap::from(value.0)
|
|
}
|
|
}
|
|
|
|
impl<T: TrustedEntityBorrow, const N: usize> From<UniqueEntityArray<T, N>> for LinkedList<T> {
|
|
fn from(value: UniqueEntityArray<T, N>) -> Self {
|
|
LinkedList::from(value.0)
|
|
}
|
|
}
|
|
|
|
impl<T: TrustedEntityBorrow, const N: usize> From<UniqueEntityArray<T, N>> for Vec<T> {
|
|
fn from(value: UniqueEntityArray<T, N>) -> Self {
|
|
Vec::from(value.0)
|
|
}
|
|
}
|
|
|
|
impl<T: TrustedEntityBorrow, const N: usize> From<UniqueEntityArray<T, N>> for VecDeque<T> {
|
|
fn from(value: UniqueEntityArray<T, N>) -> Self {
|
|
VecDeque::from(value.0)
|
|
}
|
|
}
|
|
|
|
impl<T: TrustedEntityBorrow + PartialEq<U>, U: TrustedEntityBorrow, const N: usize>
|
|
PartialEq<&UniqueEntitySlice<U>> for UniqueEntityArray<T, N>
|
|
{
|
|
fn eq(&self, other: &&UniqueEntitySlice<U>) -> bool {
|
|
self.0.eq(&other.as_inner())
|
|
}
|
|
}
|
|
|
|
impl<T: TrustedEntityBorrow + PartialEq<U>, U: TrustedEntityBorrow, const N: usize>
|
|
PartialEq<UniqueEntitySlice<U>> for UniqueEntityArray<T, N>
|
|
{
|
|
fn eq(&self, other: &UniqueEntitySlice<U>) -> bool {
|
|
self.0.eq(other.as_inner())
|
|
}
|
|
}
|
|
|
|
impl<T: PartialEq<U>, U: TrustedEntityBorrow, const N: usize> PartialEq<&UniqueEntityArray<U, N>>
|
|
for Vec<T>
|
|
{
|
|
fn eq(&self, other: &&UniqueEntityArray<U, N>) -> bool {
|
|
self.eq(&other.0)
|
|
}
|
|
}
|
|
impl<T: PartialEq<U>, U: TrustedEntityBorrow, const N: usize> PartialEq<&UniqueEntityArray<U, N>>
|
|
for VecDeque<T>
|
|
{
|
|
fn eq(&self, other: &&UniqueEntityArray<U, N>) -> bool {
|
|
self.eq(&other.0)
|
|
}
|
|
}
|
|
|
|
impl<T: PartialEq<U>, U: TrustedEntityBorrow, const N: usize>
|
|
PartialEq<&mut UniqueEntityArray<U, N>> for VecDeque<T>
|
|
{
|
|
fn eq(&self, other: &&mut UniqueEntityArray<U, N>) -> bool {
|
|
self.eq(&other.0)
|
|
}
|
|
}
|
|
|
|
impl<T: PartialEq<U>, U: TrustedEntityBorrow, const N: usize> PartialEq<UniqueEntityArray<U, N>>
|
|
for Vec<T>
|
|
{
|
|
fn eq(&self, other: &UniqueEntityArray<U, N>) -> bool {
|
|
self.eq(&other.0)
|
|
}
|
|
}
|
|
impl<T: PartialEq<U>, U: TrustedEntityBorrow, const N: usize> PartialEq<UniqueEntityArray<U, N>>
|
|
for VecDeque<T>
|
|
{
|
|
fn eq(&self, other: &UniqueEntityArray<U, N>) -> bool {
|
|
self.eq(&other.0)
|
|
}
|
|
}
|
|
|
|
pub type IntoIter<T, const N: usize> = UniqueEntityIter<array::IntoIter<T, N>>;
|
|
|
|
impl<T: TrustedEntityBorrow, const N: usize> UniqueEntityIter<array::IntoIter<T, N>> {
|
|
/// Returns an immutable slice of all elements that have not been yielded
|
|
/// yet.
|
|
///
|
|
/// Equivalent to [`array::IntoIter::as_slice`].
|
|
pub fn as_slice(&self) -> &UniqueEntitySlice<T> {
|
|
// SAFETY: All elements in the original slice are unique.
|
|
unsafe { UniqueEntitySlice::from_slice_unchecked(self.as_inner().as_slice()) }
|
|
}
|
|
|
|
/// Returns a mutable slice of all elements that have not been yielded yet.
|
|
///
|
|
/// Equivalent to [`array::IntoIter::as_mut_slice`].
|
|
pub fn as_mut_slice(&mut self) -> &mut UniqueEntitySlice<T> {
|
|
// SAFETY: All elements in the original slice are unique.
|
|
unsafe { UniqueEntitySlice::from_slice_unchecked_mut(self.as_mut_inner().as_mut_slice()) }
|
|
}
|
|
}
|