Rollup merge of #136555 - cramertj:split_off, r=dtolnay
Rename `slice::take...` methods to `split_off...` This rename was discussed and recommended in a recent t-libs meeting. cc https://github.com/rust-lang/rust/issues/62280 There's an additional commit here which modifies internals of unstable `OneSidedRange` APIs in order to implement `split_off` methods in a panic-free way (remove `unreachable!()`) as recommended in https://github.com/rust-lang/rust/pull/88502/files#r760177240. I can split this out into a separate PR if needed.
This commit is contained in:
许杰友 Jieyou Xu (Joe)
GitHub
commit
fd4623bdcc
4 changed files with 133 additions and 94 deletions
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@ -182,10 +182,10 @@ pub use self::function::{Fn, FnMut, FnOnce};
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#[stable(feature = "rust1", since = "1.0.0")]
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pub use self::index::{Index, IndexMut};
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pub(crate) use self::index_range::IndexRange;
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#[unstable(feature = "one_sided_range", issue = "69780")]
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pub use self::range::OneSidedRange;
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#[stable(feature = "inclusive_range", since = "1.26.0")]
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pub use self::range::{Bound, RangeBounds, RangeInclusive, RangeToInclusive};
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#[unstable(feature = "one_sided_range", issue = "69780")]
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pub use self::range::{OneSidedRange, OneSidedRangeBound};
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#[stable(feature = "rust1", since = "1.0.0")]
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pub use self::range::{Range, RangeFrom, RangeFull, RangeTo};
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#[unstable(feature = "try_trait_v2_residual", issue = "91285")]
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@ -979,6 +979,19 @@ impl<T> RangeBounds<T> for RangeToInclusive<&T> {
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}
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}
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/// An internal helper for `split_off` functions indicating
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/// which end a `OneSidedRange` is bounded on.
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#[unstable(feature = "one_sided_range", issue = "69780")]
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#[allow(missing_debug_implementations)]
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pub enum OneSidedRangeBound {
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/// The range is bounded inclusively from below and is unbounded above.
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StartInclusive,
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/// The range is bounded exclusively from above and is unbounded below.
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End,
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/// The range is bounded inclusively from above and is unbounded below.
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EndInclusive,
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}
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/// `OneSidedRange` is implemented for built-in range types that are unbounded
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/// on one side. For example, `a..`, `..b` and `..=c` implement `OneSidedRange`,
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/// but `..`, `d..e`, and `f..=g` do not.
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@ -986,13 +999,38 @@ impl<T> RangeBounds<T> for RangeToInclusive<&T> {
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/// Types that implement `OneSidedRange<T>` must return `Bound::Unbounded`
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/// from one of `RangeBounds::start_bound` or `RangeBounds::end_bound`.
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#[unstable(feature = "one_sided_range", issue = "69780")]
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pub trait OneSidedRange<T: ?Sized>: RangeBounds<T> {}
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pub trait OneSidedRange<T: ?Sized>: RangeBounds<T> {
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/// An internal-only helper function for `split_off` and
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/// `split_off_mut` that returns the bound of the one-sided range.
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fn bound(self) -> (OneSidedRangeBound, T);
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}
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#[unstable(feature = "one_sided_range", issue = "69780")]
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impl<T> OneSidedRange<T> for RangeTo<T> where Self: RangeBounds<T> {}
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impl<T> OneSidedRange<T> for RangeTo<T>
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where
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Self: RangeBounds<T>,
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{
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fn bound(self) -> (OneSidedRangeBound, T) {
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(OneSidedRangeBound::End, self.end)
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}
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}
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#[unstable(feature = "one_sided_range", issue = "69780")]
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impl<T> OneSidedRange<T> for RangeFrom<T> where Self: RangeBounds<T> {}
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impl<T> OneSidedRange<T> for RangeFrom<T>
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where
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Self: RangeBounds<T>,
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{
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fn bound(self) -> (OneSidedRangeBound, T) {
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(OneSidedRangeBound::StartInclusive, self.start)
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}
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}
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#[unstable(feature = "one_sided_range", issue = "69780")]
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impl<T> OneSidedRange<T> for RangeToInclusive<T> where Self: RangeBounds<T> {}
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impl<T> OneSidedRange<T> for RangeToInclusive<T>
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where
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Self: RangeBounds<T>,
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{
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fn bound(self) -> (OneSidedRangeBound, T) {
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(OneSidedRangeBound::EndInclusive, self.end)
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}
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}
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@ -10,7 +10,7 @@ use crate::cmp::Ordering::{self, Equal, Greater, Less};
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use crate::intrinsics::{exact_div, unchecked_sub};
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use crate::mem::{self, SizedTypeProperties};
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use crate::num::NonZero;
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use crate::ops::{Bound, OneSidedRange, Range, RangeBounds, RangeInclusive};
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use crate::ops::{OneSidedRange, OneSidedRangeBound, Range, RangeBounds, RangeInclusive};
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use crate::panic::const_panic;
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use crate::simd::{self, Simd};
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use crate::ub_checks::assert_unsafe_precondition;
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@ -83,14 +83,12 @@ pub use raw::{from_raw_parts, from_raw_parts_mut};
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/// which to split. Returns `None` if the split index would overflow.
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#[inline]
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fn split_point_of(range: impl OneSidedRange<usize>) -> Option<(Direction, usize)> {
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use Bound::*;
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use OneSidedRangeBound::{End, EndInclusive, StartInclusive};
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Some(match (range.start_bound(), range.end_bound()) {
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(Unbounded, Excluded(i)) => (Direction::Front, *i),
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(Unbounded, Included(i)) => (Direction::Front, i.checked_add(1)?),
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(Excluded(i), Unbounded) => (Direction::Back, i.checked_add(1)?),
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(Included(i), Unbounded) => (Direction::Back, *i),
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_ => unreachable!(),
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Some(match range.bound() {
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(StartInclusive, i) => (Direction::Back, i),
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(End, i) => (Direction::Front, i),
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(EndInclusive, i) => (Direction::Front, i.checked_add(1)?),
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})
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}
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@ -4294,25 +4292,25 @@ impl<T> [T] {
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///
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/// # Examples
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///
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/// Taking the first three elements of a slice:
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/// Splitting off the first three elements of a slice:
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///
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/// ```
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/// #![feature(slice_take)]
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///
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/// let mut slice: &[_] = &['a', 'b', 'c', 'd'];
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/// let mut first_three = slice.take(..3).unwrap();
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/// let mut first_three = slice.split_off(..3).unwrap();
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///
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/// assert_eq!(slice, &['d']);
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/// assert_eq!(first_three, &['a', 'b', 'c']);
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/// ```
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///
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/// Taking the last two elements of a slice:
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/// Splitting off the last two elements of a slice:
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///
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/// ```
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/// #![feature(slice_take)]
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///
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/// let mut slice: &[_] = &['a', 'b', 'c', 'd'];
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/// let mut tail = slice.take(2..).unwrap();
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/// let mut tail = slice.split_off(2..).unwrap();
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///
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/// assert_eq!(slice, &['a', 'b']);
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/// assert_eq!(tail, &['c', 'd']);
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@ -4325,16 +4323,19 @@ impl<T> [T] {
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///
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/// let mut slice: &[_] = &['a', 'b', 'c', 'd'];
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///
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/// assert_eq!(None, slice.take(5..));
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/// assert_eq!(None, slice.take(..5));
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/// assert_eq!(None, slice.take(..=4));
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/// assert_eq!(None, slice.split_off(5..));
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/// assert_eq!(None, slice.split_off(..5));
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/// assert_eq!(None, slice.split_off(..=4));
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/// let expected: &[char] = &['a', 'b', 'c', 'd'];
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/// assert_eq!(Some(expected), slice.take(..4));
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/// assert_eq!(Some(expected), slice.split_off(..4));
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/// ```
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#[inline]
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#[must_use = "method does not modify the slice if the range is out of bounds"]
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#[unstable(feature = "slice_take", issue = "62280")]
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pub fn take<'a, R: OneSidedRange<usize>>(self: &mut &'a Self, range: R) -> Option<&'a Self> {
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pub fn split_off<'a, R: OneSidedRange<usize>>(
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self: &mut &'a Self,
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range: R,
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) -> Option<&'a Self> {
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let (direction, split_index) = split_point_of(range)?;
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if split_index > self.len() {
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return None;
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@ -4363,13 +4364,13 @@ impl<T> [T] {
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///
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/// # Examples
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///
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/// Taking the first three elements of a slice:
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/// Splitting off the first three elements of a slice:
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///
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/// ```
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/// #![feature(slice_take)]
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///
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/// let mut slice: &mut [_] = &mut ['a', 'b', 'c', 'd'];
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/// let mut first_three = slice.take_mut(..3).unwrap();
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/// let mut first_three = slice.split_off_mut(..3).unwrap();
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///
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/// assert_eq!(slice, &mut ['d']);
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/// assert_eq!(first_three, &mut ['a', 'b', 'c']);
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@ -4381,7 +4382,7 @@ impl<T> [T] {
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/// #![feature(slice_take)]
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///
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/// let mut slice: &mut [_] = &mut ['a', 'b', 'c', 'd'];
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/// let mut tail = slice.take_mut(2..).unwrap();
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/// let mut tail = slice.split_off_mut(2..).unwrap();
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///
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/// assert_eq!(slice, &mut ['a', 'b']);
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/// assert_eq!(tail, &mut ['c', 'd']);
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@ -4394,16 +4395,16 @@ impl<T> [T] {
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///
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/// let mut slice: &mut [_] = &mut ['a', 'b', 'c', 'd'];
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///
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/// assert_eq!(None, slice.take_mut(5..));
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/// assert_eq!(None, slice.take_mut(..5));
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/// assert_eq!(None, slice.take_mut(..=4));
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/// assert_eq!(None, slice.split_off_mut(5..));
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/// assert_eq!(None, slice.split_off_mut(..5));
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/// assert_eq!(None, slice.split_off_mut(..=4));
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/// let expected: &mut [_] = &mut ['a', 'b', 'c', 'd'];
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/// assert_eq!(Some(expected), slice.take_mut(..4));
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/// assert_eq!(Some(expected), slice.split_off_mut(..4));
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/// ```
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#[inline]
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#[must_use = "method does not modify the slice if the range is out of bounds"]
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#[unstable(feature = "slice_take", issue = "62280")]
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pub fn take_mut<'a, R: OneSidedRange<usize>>(
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pub fn split_off_mut<'a, R: OneSidedRange<usize>>(
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self: &mut &'a mut Self,
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range: R,
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) -> Option<&'a mut Self> {
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@ -4435,14 +4436,14 @@ impl<T> [T] {
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/// #![feature(slice_take)]
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///
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/// let mut slice: &[_] = &['a', 'b', 'c'];
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/// let first = slice.take_first().unwrap();
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/// let first = slice.split_off_first().unwrap();
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///
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/// assert_eq!(slice, &['b', 'c']);
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/// assert_eq!(first, &'a');
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/// ```
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#[inline]
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#[unstable(feature = "slice_take", issue = "62280")]
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pub fn take_first<'a>(self: &mut &'a Self) -> Option<&'a T> {
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pub fn split_off_first<'a>(self: &mut &'a Self) -> Option<&'a T> {
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let (first, rem) = self.split_first()?;
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*self = rem;
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Some(first)
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@ -4459,7 +4460,7 @@ impl<T> [T] {
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/// #![feature(slice_take)]
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///
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/// let mut slice: &mut [_] = &mut ['a', 'b', 'c'];
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/// let first = slice.take_first_mut().unwrap();
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/// let first = slice.split_off_first_mut().unwrap();
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/// *first = 'd';
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///
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/// assert_eq!(slice, &['b', 'c']);
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@ -4467,7 +4468,7 @@ impl<T> [T] {
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/// ```
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#[inline]
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#[unstable(feature = "slice_take", issue = "62280")]
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pub fn take_first_mut<'a>(self: &mut &'a mut Self) -> Option<&'a mut T> {
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pub fn split_off_first_mut<'a>(self: &mut &'a mut Self) -> Option<&'a mut T> {
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let (first, rem) = mem::take(self).split_first_mut()?;
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*self = rem;
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Some(first)
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@ -4484,14 +4485,14 @@ impl<T> [T] {
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/// #![feature(slice_take)]
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///
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/// let mut slice: &[_] = &['a', 'b', 'c'];
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/// let last = slice.take_last().unwrap();
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/// let last = slice.split_off_last().unwrap();
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///
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/// assert_eq!(slice, &['a', 'b']);
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/// assert_eq!(last, &'c');
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/// ```
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#[inline]
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#[unstable(feature = "slice_take", issue = "62280")]
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pub fn take_last<'a>(self: &mut &'a Self) -> Option<&'a T> {
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pub fn split_off_last<'a>(self: &mut &'a Self) -> Option<&'a T> {
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let (last, rem) = self.split_last()?;
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*self = rem;
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Some(last)
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@ -4508,7 +4509,7 @@ impl<T> [T] {
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/// #![feature(slice_take)]
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///
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/// let mut slice: &mut [_] = &mut ['a', 'b', 'c'];
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/// let last = slice.take_last_mut().unwrap();
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/// let last = slice.split_off_last_mut().unwrap();
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/// *last = 'd';
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///
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/// assert_eq!(slice, &['a', 'b']);
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@ -4516,7 +4517,7 @@ impl<T> [T] {
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/// ```
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#[inline]
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#[unstable(feature = "slice_take", issue = "62280")]
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pub fn take_last_mut<'a>(self: &mut &'a mut Self) -> Option<&'a mut T> {
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pub fn split_off_last_mut<'a>(self: &mut &'a mut Self) -> Option<&'a mut T> {
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let (last, rem) = mem::take(self).split_last_mut()?;
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*self = rem;
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Some(last)
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@ -2399,18 +2399,18 @@ fn slice_rsplit_once() {
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assert_eq!(v.rsplit_once(|&x| x == 0), None);
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}
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macro_rules! take_tests {
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macro_rules! split_off_tests {
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(slice: &[], $($tts:tt)*) => {
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take_tests!(ty: &[()], slice: &[], $($tts)*);
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split_off_tests!(ty: &[()], slice: &[], $($tts)*);
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};
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(slice: &mut [], $($tts:tt)*) => {
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take_tests!(ty: &mut [()], slice: &mut [], $($tts)*);
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split_off_tests!(ty: &mut [()], slice: &mut [], $($tts)*);
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};
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(slice: &$slice:expr, $($tts:tt)*) => {
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take_tests!(ty: &[_], slice: &$slice, $($tts)*);
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split_off_tests!(ty: &[_], slice: &$slice, $($tts)*);
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};
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(slice: &mut $slice:expr, $($tts:tt)*) => {
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take_tests!(ty: &mut [_], slice: &mut $slice, $($tts)*);
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split_off_tests!(ty: &mut [_], slice: &mut $slice, $($tts)*);
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};
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(ty: $ty:ty, slice: $slice:expr, method: $method:ident, $(($test_name:ident, ($($args:expr),*), $output:expr, $remaining:expr),)*) => {
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$(
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@ -2425,64 +2425,64 @@ macro_rules! take_tests {
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};
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}
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take_tests! {
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slice: &[0, 1, 2, 3], method: take,
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(take_in_bounds_range_to, (..1), Some(&[0] as _), &[1, 2, 3]),
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(take_in_bounds_range_to_inclusive, (..=0), Some(&[0] as _), &[1, 2, 3]),
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(take_in_bounds_range_from, (2..), Some(&[2, 3] as _), &[0, 1]),
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(take_oob_range_to, (..5), None, &[0, 1, 2, 3]),
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(take_oob_range_to_inclusive, (..=4), None, &[0, 1, 2, 3]),
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(take_oob_range_from, (5..), None, &[0, 1, 2, 3]),
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split_off_tests! {
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slice: &[0, 1, 2, 3], method: split_off,
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(split_off_in_bounds_range_to, (..1), Some(&[0] as _), &[1, 2, 3]),
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(split_off_in_bounds_range_to_inclusive, (..=0), Some(&[0] as _), &[1, 2, 3]),
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(split_off_in_bounds_range_from, (2..), Some(&[2, 3] as _), &[0, 1]),
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(split_off_oob_range_to, (..5), None, &[0, 1, 2, 3]),
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(split_off_oob_range_to_inclusive, (..=4), None, &[0, 1, 2, 3]),
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(split_off_oob_range_from, (5..), None, &[0, 1, 2, 3]),
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}
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take_tests! {
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slice: &mut [0, 1, 2, 3], method: take_mut,
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(take_mut_in_bounds_range_to, (..1), Some(&mut [0] as _), &mut [1, 2, 3]),
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(take_mut_in_bounds_range_to_inclusive, (..=0), Some(&mut [0] as _), &mut [1, 2, 3]),
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(take_mut_in_bounds_range_from, (2..), Some(&mut [2, 3] as _), &mut [0, 1]),
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(take_mut_oob_range_to, (..5), None, &mut [0, 1, 2, 3]),
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(take_mut_oob_range_to_inclusive, (..=4), None, &mut [0, 1, 2, 3]),
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(take_mut_oob_range_from, (5..), None, &mut [0, 1, 2, 3]),
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split_off_tests! {
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slice: &mut [0, 1, 2, 3], method: split_off_mut,
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(split_off_mut_in_bounds_range_to, (..1), Some(&mut [0] as _), &mut [1, 2, 3]),
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(split_off_mut_in_bounds_range_to_inclusive, (..=0), Some(&mut [0] as _), &mut [1, 2, 3]),
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(split_off_mut_in_bounds_range_from, (2..), Some(&mut [2, 3] as _), &mut [0, 1]),
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(split_off_mut_oob_range_to, (..5), None, &mut [0, 1, 2, 3]),
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(split_off_mut_oob_range_to_inclusive, (..=4), None, &mut [0, 1, 2, 3]),
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(split_off_mut_oob_range_from, (5..), None, &mut [0, 1, 2, 3]),
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}
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take_tests! {
|
||||
slice: &[1, 2], method: take_first,
|
||||
(take_first_nonempty, (), Some(&1), &[2]),
|
||||
split_off_tests! {
|
||||
slice: &[1, 2], method: split_off_first,
|
||||
(split_off_first_nonempty, (), Some(&1), &[2]),
|
||||
}
|
||||
|
||||
take_tests! {
|
||||
slice: &mut [1, 2], method: take_first_mut,
|
||||
(take_first_mut_nonempty, (), Some(&mut 1), &mut [2]),
|
||||
split_off_tests! {
|
||||
slice: &mut [1, 2], method: split_off_first_mut,
|
||||
(split_off_first_mut_nonempty, (), Some(&mut 1), &mut [2]),
|
||||
}
|
||||
|
||||
take_tests! {
|
||||
slice: &[1, 2], method: take_last,
|
||||
(take_last_nonempty, (), Some(&2), &[1]),
|
||||
split_off_tests! {
|
||||
slice: &[1, 2], method: split_off_last,
|
||||
(split_off_last_nonempty, (), Some(&2), &[1]),
|
||||
}
|
||||
|
||||
take_tests! {
|
||||
slice: &mut [1, 2], method: take_last_mut,
|
||||
(take_last_mut_nonempty, (), Some(&mut 2), &mut [1]),
|
||||
split_off_tests! {
|
||||
slice: &mut [1, 2], method: split_off_last_mut,
|
||||
(split_off_last_mut_nonempty, (), Some(&mut 2), &mut [1]),
|
||||
}
|
||||
|
||||
take_tests! {
|
||||
slice: &[], method: take_first,
|
||||
(take_first_empty, (), None, &[]),
|
||||
split_off_tests! {
|
||||
slice: &[], method: split_off_first,
|
||||
(split_off_first_empty, (), None, &[]),
|
||||
}
|
||||
|
||||
take_tests! {
|
||||
slice: &mut [], method: take_first_mut,
|
||||
(take_first_mut_empty, (), None, &mut []),
|
||||
split_off_tests! {
|
||||
slice: &mut [], method: split_off_first_mut,
|
||||
(split_off_first_mut_empty, (), None, &mut []),
|
||||
}
|
||||
|
||||
take_tests! {
|
||||
slice: &[], method: take_last,
|
||||
(take_last_empty, (), None, &[]),
|
||||
split_off_tests! {
|
||||
slice: &[], method: split_off_last,
|
||||
(split_off_last_empty, (), None, &[]),
|
||||
}
|
||||
|
||||
take_tests! {
|
||||
slice: &mut [], method: take_last_mut,
|
||||
(take_last_mut_empty, (), None, &mut []),
|
||||
split_off_tests! {
|
||||
slice: &mut [], method: split_off_last_mut,
|
||||
(split_off_last_mut_empty, (), None, &mut []),
|
||||
}
|
||||
|
||||
#[cfg(not(miri))] // unused in Miri
|
||||
|
|
@ -2497,19 +2497,19 @@ macro_rules! empty_max_mut {
|
|||
}
|
||||
|
||||
#[cfg(not(miri))] // Comparing usize::MAX many elements takes forever in Miri (and in rustc without optimizations)
|
||||
take_tests! {
|
||||
slice: &[(); usize::MAX], method: take,
|
||||
(take_in_bounds_max_range_to, (..usize::MAX), Some(EMPTY_MAX), &[(); 0]),
|
||||
(take_oob_max_range_to_inclusive, (..=usize::MAX), None, EMPTY_MAX),
|
||||
(take_in_bounds_max_range_from, (usize::MAX..), Some(&[] as _), EMPTY_MAX),
|
||||
split_off_tests! {
|
||||
slice: &[(); usize::MAX], method: split_off,
|
||||
(split_off_in_bounds_max_range_to, (..usize::MAX), Some(EMPTY_MAX), &[(); 0]),
|
||||
(split_off_oob_max_range_to_inclusive, (..=usize::MAX), None, EMPTY_MAX),
|
||||
(split_off_in_bounds_max_range_from, (usize::MAX..), Some(&[] as _), EMPTY_MAX),
|
||||
}
|
||||
|
||||
#[cfg(not(miri))] // Comparing usize::MAX many elements takes forever in Miri (and in rustc without optimizations)
|
||||
take_tests! {
|
||||
slice: &mut [(); usize::MAX], method: take_mut,
|
||||
(take_mut_in_bounds_max_range_to, (..usize::MAX), Some(empty_max_mut!()), &mut [(); 0]),
|
||||
(take_mut_oob_max_range_to_inclusive, (..=usize::MAX), None, empty_max_mut!()),
|
||||
(take_mut_in_bounds_max_range_from, (usize::MAX..), Some(&mut [] as _), empty_max_mut!()),
|
||||
split_off_tests! {
|
||||
slice: &mut [(); usize::MAX], method: split_off_mut,
|
||||
(split_off_mut_in_bounds_max_range_to, (..usize::MAX), Some(empty_max_mut!()), &mut [(); 0]),
|
||||
(split_off_mut_oob_max_range_to_inclusive, (..=usize::MAX), None, empty_max_mut!()),
|
||||
(split_off_mut_in_bounds_max_range_from, (usize::MAX..), Some(&mut [] as _), empty_max_mut!()),
|
||||
}
|
||||
|
||||
#[test]
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue