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doc: describe panic conditions for SliceIndex implementations #123271

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Mar 31, 2024
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doc: describe panic conditions for SliceIndex implementations #123271

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11 changes: 11 additions & 0 deletions library/core/src/slice/index.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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 {
Expand Down Expand Up @@ -328,6 +329,9 @@ unsafe impl<T> SliceIndex<[T]> for ops::IndexRange {
}
}

/// 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> {
Expand Down Expand Up @@ -416,6 +420,7 @@ unsafe impl<T> SliceIndex<[T]> for ops::Range<usize> {
}
}

/// 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> {
Expand Down Expand Up @@ -454,6 +459,7 @@ unsafe impl<T> SliceIndex<[T]> for ops::RangeTo<usize> {
}
}

/// 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> {
Expand Down Expand Up @@ -536,6 +542,10 @@ unsafe impl<T> SliceIndex<[T]> for ops::RangeFull {
}
}

/// 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> {
Expand Down Expand Up @@ -580,6 +590,7 @@ unsafe impl<T> SliceIndex<[T]> for ops::RangeInclusive<usize> {
}
}

/// 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> {
Expand Down