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Rollup merge of #123271 - JaniM:janim/sliceindex-doc, r=Nilstrieb

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doc: describe panic conditions for SliceIndex implementations

Implementation note: The most probable place for users to find the documentation is at https://doc.rust-lang.org/std/slice/trait.SliceIndex.html

On that page, documentation added to specific methods will not be visible. As such, I opted to add the comments to the impl blocks directly.

Helps with #121568.
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Jubilee 2024-03-31 13:18:17 -07:00 committed by GitHub
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11
library/core/src/slice/index.rs
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@ -195,6 +195,7 @@ pub unsafe trait SliceIndex<T: ?Sized>: private_slice_index::Sealed {
fn index_mut(self, slice: &mut T) -> &mut Self::Output;
}
/// The methods `index` and `index_mut` panic if the index is out of bounds.
#[stable(feature = "slice_get_slice_impls", since = "1.15.0")]
#[rustc_const_unstable(feature = "const_slice_index", issue = "none")]
unsafe impl<T> SliceIndex<[T]> for usize {
@ -328,6 +329,9 @@ fn index_mut(self, slice: &mut [T]) -> &mut [T] {
}
}
/// The methods `index` and `index_mut` panic if:
/// - the start of the range is greater than the end of the range or
/// - the end of the range is out of bounds.
#[stable(feature = "slice_get_slice_impls", since = "1.15.0")]
#[rustc_const_unstable(feature = "const_slice_index", issue = "none")]
unsafe impl<T> SliceIndex<[T]> for ops::Range<usize> {
@ -416,6 +420,7 @@ fn index_mut(self, slice: &mut [T]) -> &mut [T] {
}
}
/// The methods `index` and `index_mut` panic if the end of the range is out of bounds.
#[stable(feature = "slice_get_slice_impls", since = "1.15.0")]
#[rustc_const_unstable(feature = "const_slice_index", issue = "none")]
unsafe impl<T> SliceIndex<[T]> for ops::RangeTo<usize> {
@ -454,6 +459,7 @@ fn index_mut(self, slice: &mut [T]) -> &mut [T] {
}
}
/// The methods `index` and `index_mut` panic if the start of the range is out of bounds.
#[stable(feature = "slice_get_slice_impls", since = "1.15.0")]
#[rustc_const_unstable(feature = "const_slice_index", issue = "none")]
unsafe impl<T> SliceIndex<[T]> for ops::RangeFrom<usize> {
@ -536,6 +542,10 @@ fn index_mut(self, slice: &mut [T]) -> &mut [T] {
}
}
/// The methods `index` and `index_mut` panic if:
/// - the end of the range is `usize::MAX` or
/// - the start of the range is greater than the end of the range or
/// - the end of the range is out of bounds.
#[stable(feature = "inclusive_range", since = "1.26.0")]
#[rustc_const_unstable(feature = "const_slice_index", issue = "none")]
unsafe impl<T> SliceIndex<[T]> for ops::RangeInclusive<usize> {
@ -580,6 +590,7 @@ fn index_mut(self, slice: &mut [T]) -> &mut [T] {
}
}
/// The methods `index` and `index_mut` panic if the end of the range is out of bounds.
#[stable(feature = "inclusive_range", since = "1.26.0")]
#[rustc_const_unstable(feature = "const_slice_index", issue = "none")]
unsafe impl<T> SliceIndex<[T]> for ops::RangeToInclusive<usize> {