4 /// An unbounded range (`..`).
6 /// `RangeFull` is primarily used as a [slicing index], its shorthand is `..`.
7 /// It cannot serve as an [`Iterator`] because it doesn't have a starting point.
11 /// The `..` syntax is a `RangeFull`:
14 /// assert_eq!((..), std::ops::RangeFull);
17 /// It does not have an [`IntoIterator`] implementation, so you can't use it in
18 /// a `for` loop directly. This won't compile:
20 /// ```compile_fail,E0277
26 /// Used as a [slicing index], `RangeFull` produces the full array as a slice.
29 /// let arr = [0, 1, 2, 3, 4];
30 /// assert_eq!(arr[ .. ], [0,1,2,3,4]); // RangeFull
31 /// assert_eq!(arr[ .. 3], [0,1,2 ]);
32 /// assert_eq!(arr[ ..=3], [0,1,2,3 ]);
33 /// assert_eq!(arr[1.. ], [ 1,2,3,4]);
34 /// assert_eq!(arr[1.. 3], [ 1,2 ]);
35 /// assert_eq!(arr[1..=3], [ 1,2,3 ]);
38 /// [`IntoIterator`]: ../iter/trait.Iterator.html
39 /// [`Iterator`]: ../iter/trait.IntoIterator.html
40 /// [slicing index]: ../slice/trait.SliceIndex.html
42 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
43 #[stable(feature = "rust1", since = "1.0.0")]
46 #[stable(feature = "rust1", since = "1.0.0")]
47 impl fmt::Debug for RangeFull {
48 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
53 /// A (half-open) range bounded inclusively below and exclusively above
56 /// The `Range` `start..end` contains all values with `x >= start` and
57 /// `x < end`. It is empty unless `start < end`.
62 /// assert_eq!((3..5), std::ops::Range { start: 3, end: 5 });
63 /// assert_eq!(3 + 4 + 5, (3..6).sum());
65 /// let arr = [0, 1, 2, 3, 4];
66 /// assert_eq!(arr[ .. ], [0,1,2,3,4]);
67 /// assert_eq!(arr[ .. 3], [0,1,2 ]);
68 /// assert_eq!(arr[ ..=3], [0,1,2,3 ]);
69 /// assert_eq!(arr[1.. ], [ 1,2,3,4]);
70 /// assert_eq!(arr[1.. 3], [ 1,2 ]); // Range
71 /// assert_eq!(arr[1..=3], [ 1,2,3 ]);
74 #[derive(Clone, PartialEq, Eq, Hash)] // not Copy -- see #27186
75 #[stable(feature = "rust1", since = "1.0.0")]
76 pub struct Range<Idx> {
77 /// The lower bound of the range (inclusive).
78 #[stable(feature = "rust1", since = "1.0.0")]
80 /// The upper bound of the range (exclusive).
81 #[stable(feature = "rust1", since = "1.0.0")]
85 #[stable(feature = "rust1", since = "1.0.0")]
86 impl<Idx: fmt::Debug> fmt::Debug for Range<Idx> {
87 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
95 impl<Idx: PartialOrd<Idx>> Range<Idx> {
96 /// Returns `true` if `item` is contained in the range.
101 /// assert!(!(3..5).contains(&2));
102 /// assert!( (3..5).contains(&3));
103 /// assert!( (3..5).contains(&4));
104 /// assert!(!(3..5).contains(&5));
106 /// assert!(!(3..3).contains(&3));
107 /// assert!(!(3..2).contains(&3));
109 /// assert!( (0.0..1.0).contains(&0.5));
110 /// assert!(!(0.0..1.0).contains(&f32::NAN));
111 /// assert!(!(0.0..f32::NAN).contains(&0.5));
112 /// assert!(!(f32::NAN..1.0).contains(&0.5));
114 #[stable(feature = "range_contains", since = "1.35.0")]
115 pub fn contains<U>(&self, item: &U) -> bool
118 U: ?Sized + PartialOrd<Idx>,
120 <Self as RangeBounds<Idx>>::contains(self, item)
123 /// Returns `true` if the range contains no items.
128 /// #![feature(range_is_empty)]
130 /// assert!(!(3..5).is_empty());
131 /// assert!( (3..3).is_empty());
132 /// assert!( (3..2).is_empty());
135 /// The range is empty if either side is incomparable:
138 /// #![feature(range_is_empty)]
140 /// assert!(!(3.0..5.0).is_empty());
141 /// assert!( (3.0..f32::NAN).is_empty());
142 /// assert!( (f32::NAN..5.0).is_empty());
144 #[unstable(feature = "range_is_empty", reason = "recently added", issue = "48111")]
145 pub fn is_empty(&self) -> bool {
146 !(self.start < self.end)
150 /// A range only bounded inclusively below (`start..`).
152 /// The `RangeFrom` `start..` contains all values with `x >= start`.
154 /// *Note*: Overflow in the [`Iterator`] implementation (when the contained
155 /// data type reaches its numerical limit) is allowed to panic, wrap, or
156 /// saturate. This behavior is defined by the implementation of the [`Step`]
157 /// trait. For primitive integers, this follows the normal rules, and respects
158 /// the overflow checks profile (panic in debug, wrap in release). Note also
159 /// that overflow happens earlier than you might assume: the overflow happens
160 /// in the call to `next` that yields the maximum value, as the range must be
161 /// set to a state to yield the next value.
163 /// [`Step`]: crate::iter::Step
168 /// assert_eq!((2..), std::ops::RangeFrom { start: 2 });
169 /// assert_eq!(2 + 3 + 4, (2..).take(3).sum());
171 /// let arr = [0, 1, 2, 3, 4];
172 /// assert_eq!(arr[ .. ], [0,1,2,3,4]);
173 /// assert_eq!(arr[ .. 3], [0,1,2 ]);
174 /// assert_eq!(arr[ ..=3], [0,1,2,3 ]);
175 /// assert_eq!(arr[1.. ], [ 1,2,3,4]); // RangeFrom
176 /// assert_eq!(arr[1.. 3], [ 1,2 ]);
177 /// assert_eq!(arr[1..=3], [ 1,2,3 ]);
180 /// [`Iterator`]: ../iter/trait.IntoIterator.html
182 #[derive(Clone, PartialEq, Eq, Hash)] // not Copy -- see #27186
183 #[stable(feature = "rust1", since = "1.0.0")]
184 pub struct RangeFrom<Idx> {
185 /// The lower bound of the range (inclusive).
186 #[stable(feature = "rust1", since = "1.0.0")]
190 #[stable(feature = "rust1", since = "1.0.0")]
191 impl<Idx: fmt::Debug> fmt::Debug for RangeFrom<Idx> {
192 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
193 self.start.fmt(fmt)?;
199 impl<Idx: PartialOrd<Idx>> RangeFrom<Idx> {
200 /// Returns `true` if `item` is contained in the range.
205 /// assert!(!(3..).contains(&2));
206 /// assert!( (3..).contains(&3));
207 /// assert!( (3..).contains(&1_000_000_000));
209 /// assert!( (0.0..).contains(&0.5));
210 /// assert!(!(0.0..).contains(&f32::NAN));
211 /// assert!(!(f32::NAN..).contains(&0.5));
213 #[stable(feature = "range_contains", since = "1.35.0")]
214 pub fn contains<U>(&self, item: &U) -> bool
217 U: ?Sized + PartialOrd<Idx>,
219 <Self as RangeBounds<Idx>>::contains(self, item)
223 /// A range only bounded exclusively above (`..end`).
225 /// The `RangeTo` `..end` contains all values with `x < end`.
226 /// It cannot serve as an [`Iterator`] because it doesn't have a starting point.
230 /// The `..end` syntax is a `RangeTo`:
233 /// assert_eq!((..5), std::ops::RangeTo { end: 5 });
236 /// It does not have an [`IntoIterator`] implementation, so you can't use it in
237 /// a `for` loop directly. This won't compile:
239 /// ```compile_fail,E0277
240 /// // error[E0277]: the trait bound `std::ops::RangeTo<{integer}>:
241 /// // std::iter::Iterator` is not satisfied
247 /// When used as a [slicing index], `RangeTo` produces a slice of all array
248 /// elements before the index indicated by `end`.
251 /// let arr = [0, 1, 2, 3, 4];
252 /// assert_eq!(arr[ .. ], [0,1,2,3,4]);
253 /// assert_eq!(arr[ .. 3], [0,1,2 ]); // RangeTo
254 /// assert_eq!(arr[ ..=3], [0,1,2,3 ]);
255 /// assert_eq!(arr[1.. ], [ 1,2,3,4]);
256 /// assert_eq!(arr[1.. 3], [ 1,2 ]);
257 /// assert_eq!(arr[1..=3], [ 1,2,3 ]);
260 /// [`IntoIterator`]: ../iter/trait.Iterator.html
261 /// [`Iterator`]: ../iter/trait.IntoIterator.html
262 /// [slicing index]: ../slice/trait.SliceIndex.html
264 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
265 #[stable(feature = "rust1", since = "1.0.0")]
266 pub struct RangeTo<Idx> {
267 /// The upper bound of the range (exclusive).
268 #[stable(feature = "rust1", since = "1.0.0")]
272 #[stable(feature = "rust1", since = "1.0.0")]
273 impl<Idx: fmt::Debug> fmt::Debug for RangeTo<Idx> {
274 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
281 impl<Idx: PartialOrd<Idx>> RangeTo<Idx> {
282 /// Returns `true` if `item` is contained in the range.
287 /// assert!( (..5).contains(&-1_000_000_000));
288 /// assert!( (..5).contains(&4));
289 /// assert!(!(..5).contains(&5));
291 /// assert!( (..1.0).contains(&0.5));
292 /// assert!(!(..1.0).contains(&f32::NAN));
293 /// assert!(!(..f32::NAN).contains(&0.5));
295 #[stable(feature = "range_contains", since = "1.35.0")]
296 pub fn contains<U>(&self, item: &U) -> bool
299 U: ?Sized + PartialOrd<Idx>,
301 <Self as RangeBounds<Idx>>::contains(self, item)
305 /// A range bounded inclusively below and above (`start..=end`).
307 /// The `RangeInclusive` `start..=end` contains all values with `x >= start`
308 /// and `x <= end`. It is empty unless `start <= end`.
310 /// This iterator is [fused], but the specific values of `start` and `end` after
311 /// iteration has finished are **unspecified** other than that [`.is_empty()`]
312 /// will return `true` once no more values will be produced.
314 /// [fused]: ../iter/trait.FusedIterator.html
315 /// [`.is_empty()`]: #method.is_empty
320 /// assert_eq!((3..=5), std::ops::RangeInclusive::new(3, 5));
321 /// assert_eq!(3 + 4 + 5, (3..=5).sum());
323 /// let arr = [0, 1, 2, 3, 4];
324 /// assert_eq!(arr[ .. ], [0,1,2,3,4]);
325 /// assert_eq!(arr[ .. 3], [0,1,2 ]);
326 /// assert_eq!(arr[ ..=3], [0,1,2,3 ]);
327 /// assert_eq!(arr[1.. ], [ 1,2,3,4]);
328 /// assert_eq!(arr[1.. 3], [ 1,2 ]);
329 /// assert_eq!(arr[1..=3], [ 1,2,3 ]); // RangeInclusive
331 #[doc(alias = "..=")]
332 #[derive(Clone, PartialEq, Eq, Hash)] // not Copy -- see #27186
333 #[stable(feature = "inclusive_range", since = "1.26.0")]
334 pub struct RangeInclusive<Idx> {
335 // Note that the fields here are not public to allow changing the
336 // representation in the future; in particular, while we could plausibly
337 // expose start/end, modifying them without changing (future/current)
338 // private fields may lead to incorrect behavior, so we don't want to
339 // support that mode.
340 pub(crate) start: Idx,
344 // - `false` upon construction
345 // - `false` when iteration has yielded an element and the iterator is not exhausted
346 // - `true` when iteration has been used to exhaust the iterator
348 // This is required to support PartialEq and Hash without a PartialOrd bound or specialization.
349 pub(crate) exhausted: bool,
352 impl<Idx> RangeInclusive<Idx> {
353 /// Creates a new inclusive range. Equivalent to writing `start..=end`.
358 /// use std::ops::RangeInclusive;
360 /// assert_eq!(3..=5, RangeInclusive::new(3, 5));
362 #[stable(feature = "inclusive_range_methods", since = "1.27.0")]
365 #[rustc_const_stable(feature = "const_range_new", since = "1.32.0")]
366 pub const fn new(start: Idx, end: Idx) -> Self {
367 Self { start, end, exhausted: false }
370 /// Returns the lower bound of the range (inclusive).
372 /// When using an inclusive range for iteration, the values of `start()` and
373 /// [`end()`] are unspecified after the iteration ended. To determine
374 /// whether the inclusive range is empty, use the [`is_empty()`] method
375 /// instead of comparing `start() > end()`.
377 /// Note: the value returned by this method is unspecified after the range
378 /// has been iterated to exhaustion.
380 /// [`end()`]: #method.end
381 /// [`is_empty()`]: #method.is_empty
386 /// assert_eq!((3..=5).start(), &3);
388 #[stable(feature = "inclusive_range_methods", since = "1.27.0")]
389 #[rustc_const_stable(feature = "const_inclusive_range_methods", since = "1.32.0")]
391 pub const fn start(&self) -> &Idx {
395 /// Returns the upper bound of the range (inclusive).
397 /// When using an inclusive range for iteration, the values of [`start()`]
398 /// and `end()` are unspecified after the iteration ended. To determine
399 /// whether the inclusive range is empty, use the [`is_empty()`] method
400 /// instead of comparing `start() > end()`.
402 /// Note: the value returned by this method is unspecified after the range
403 /// has been iterated to exhaustion.
405 /// [`start()`]: #method.start
406 /// [`is_empty()`]: #method.is_empty
411 /// assert_eq!((3..=5).end(), &5);
413 #[stable(feature = "inclusive_range_methods", since = "1.27.0")]
414 #[rustc_const_stable(feature = "const_inclusive_range_methods", since = "1.32.0")]
416 pub const fn end(&self) -> &Idx {
420 /// Destructures the `RangeInclusive` into (lower bound, upper (inclusive) bound).
422 /// Note: the value returned by this method is unspecified after the range
423 /// has been iterated to exhaustion.
428 /// assert_eq!((3..=5).into_inner(), (3, 5));
430 #[stable(feature = "inclusive_range_methods", since = "1.27.0")]
432 pub fn into_inner(self) -> (Idx, Idx) {
433 (self.start, self.end)
437 #[stable(feature = "inclusive_range", since = "1.26.0")]
438 impl<Idx: fmt::Debug> fmt::Debug for RangeInclusive<Idx> {
439 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
440 self.start.fmt(fmt)?;
444 write!(fmt, " (exhausted)")?;
450 impl<Idx: PartialOrd<Idx>> RangeInclusive<Idx> {
451 /// Returns `true` if `item` is contained in the range.
456 /// assert!(!(3..=5).contains(&2));
457 /// assert!( (3..=5).contains(&3));
458 /// assert!( (3..=5).contains(&4));
459 /// assert!( (3..=5).contains(&5));
460 /// assert!(!(3..=5).contains(&6));
462 /// assert!( (3..=3).contains(&3));
463 /// assert!(!(3..=2).contains(&3));
465 /// assert!( (0.0..=1.0).contains(&1.0));
466 /// assert!(!(0.0..=1.0).contains(&f32::NAN));
467 /// assert!(!(0.0..=f32::NAN).contains(&0.0));
468 /// assert!(!(f32::NAN..=1.0).contains(&1.0));
470 #[stable(feature = "range_contains", since = "1.35.0")]
471 pub fn contains<U>(&self, item: &U) -> bool
474 U: ?Sized + PartialOrd<Idx>,
476 <Self as RangeBounds<Idx>>::contains(self, item)
479 /// Returns `true` if the range contains no items.
484 /// #![feature(range_is_empty)]
486 /// assert!(!(3..=5).is_empty());
487 /// assert!(!(3..=3).is_empty());
488 /// assert!( (3..=2).is_empty());
491 /// The range is empty if either side is incomparable:
494 /// #![feature(range_is_empty)]
496 /// assert!(!(3.0..=5.0).is_empty());
497 /// assert!( (3.0..=f32::NAN).is_empty());
498 /// assert!( (f32::NAN..=5.0).is_empty());
501 /// This method returns `true` after iteration has finished:
504 /// #![feature(range_is_empty)]
506 /// let mut r = 3..=5;
507 /// for _ in r.by_ref() {}
508 /// // Precise field values are unspecified here
509 /// assert!(r.is_empty());
511 #[unstable(feature = "range_is_empty", reason = "recently added", issue = "48111")]
513 pub fn is_empty(&self) -> bool {
514 self.exhausted || !(self.start <= self.end)
518 /// A range only bounded inclusively above (`..=end`).
520 /// The `RangeToInclusive` `..=end` contains all values with `x <= end`.
521 /// It cannot serve as an [`Iterator`] because it doesn't have a starting point.
525 /// The `..=end` syntax is a `RangeToInclusive`:
528 /// assert_eq!((..=5), std::ops::RangeToInclusive{ end: 5 });
531 /// It does not have an [`IntoIterator`] implementation, so you can't use it in a
532 /// `for` loop directly. This won't compile:
534 /// ```compile_fail,E0277
535 /// // error[E0277]: the trait bound `std::ops::RangeToInclusive<{integer}>:
536 /// // std::iter::Iterator` is not satisfied
542 /// When used as a [slicing index], `RangeToInclusive` produces a slice of all
543 /// array elements up to and including the index indicated by `end`.
546 /// let arr = [0, 1, 2, 3, 4];
547 /// assert_eq!(arr[ .. ], [0,1,2,3,4]);
548 /// assert_eq!(arr[ .. 3], [0,1,2 ]);
549 /// assert_eq!(arr[ ..=3], [0,1,2,3 ]); // RangeToInclusive
550 /// assert_eq!(arr[1.. ], [ 1,2,3,4]);
551 /// assert_eq!(arr[1.. 3], [ 1,2 ]);
552 /// assert_eq!(arr[1..=3], [ 1,2,3 ]);
555 /// [`IntoIterator`]: ../iter/trait.Iterator.html
556 /// [`Iterator`]: ../iter/trait.IntoIterator.html
557 /// [slicing index]: ../slice/trait.SliceIndex.html
558 #[doc(alias = "..=")]
559 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
560 #[stable(feature = "inclusive_range", since = "1.26.0")]
561 pub struct RangeToInclusive<Idx> {
562 /// The upper bound of the range (inclusive)
563 #[stable(feature = "inclusive_range", since = "1.26.0")]
567 #[stable(feature = "inclusive_range", since = "1.26.0")]
568 impl<Idx: fmt::Debug> fmt::Debug for RangeToInclusive<Idx> {
569 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
576 impl<Idx: PartialOrd<Idx>> RangeToInclusive<Idx> {
577 /// Returns `true` if `item` is contained in the range.
582 /// assert!( (..=5).contains(&-1_000_000_000));
583 /// assert!( (..=5).contains(&5));
584 /// assert!(!(..=5).contains(&6));
586 /// assert!( (..=1.0).contains(&1.0));
587 /// assert!(!(..=1.0).contains(&f32::NAN));
588 /// assert!(!(..=f32::NAN).contains(&0.5));
590 #[stable(feature = "range_contains", since = "1.35.0")]
591 pub fn contains<U>(&self, item: &U) -> bool
594 U: ?Sized + PartialOrd<Idx>,
596 <Self as RangeBounds<Idx>>::contains(self, item)
600 // RangeToInclusive<Idx> cannot impl From<RangeTo<Idx>>
601 // because underflow would be possible with (..0).into()
603 /// An endpoint of a range of keys.
607 /// `Bound`s are range endpoints:
610 /// use std::ops::Bound::*;
611 /// use std::ops::RangeBounds;
613 /// assert_eq!((..100).start_bound(), Unbounded);
614 /// assert_eq!((1..12).start_bound(), Included(&1));
615 /// assert_eq!((1..12).end_bound(), Excluded(&12));
618 /// Using a tuple of `Bound`s as an argument to [`BTreeMap::range`].
619 /// Note that in most cases, it's better to use range syntax (`1..5`) instead.
622 /// use std::collections::BTreeMap;
623 /// use std::ops::Bound::{Excluded, Included, Unbounded};
625 /// let mut map = BTreeMap::new();
626 /// map.insert(3, "a");
627 /// map.insert(5, "b");
628 /// map.insert(8, "c");
630 /// for (key, value) in map.range((Excluded(3), Included(8))) {
631 /// println!("{}: {}", key, value);
634 /// assert_eq!(Some((&3, &"a")), map.range((Unbounded, Included(5))).next());
637 /// [`BTreeMap::range`]: ../../std/collections/btree_map/struct.BTreeMap.html#method.range
638 #[stable(feature = "collections_bound", since = "1.17.0")]
639 #[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
641 /// An inclusive bound.
642 #[stable(feature = "collections_bound", since = "1.17.0")]
643 Included(#[stable(feature = "collections_bound", since = "1.17.0")] T),
644 /// An exclusive bound.
645 #[stable(feature = "collections_bound", since = "1.17.0")]
646 Excluded(#[stable(feature = "collections_bound", since = "1.17.0")] T),
647 /// An infinite endpoint. Indicates that there is no bound in this direction.
648 #[stable(feature = "collections_bound", since = "1.17.0")]
652 impl<T: Clone> Bound<&T> {
653 /// Map a `Bound<&T>` to a `Bound<T>` by cloning the contents of the bound.
658 /// #![feature(bound_cloned)]
659 /// use std::ops::Bound::*;
660 /// use std::ops::RangeBounds;
662 /// assert_eq!((1..12).start_bound(), Included(&1));
663 /// assert_eq!((1..12).start_bound().cloned(), Included(1));
665 #[unstable(feature = "bound_cloned", issue = "61356")]
666 pub fn cloned(self) -> Bound<T> {
668 Bound::Unbounded => Bound::Unbounded,
669 Bound::Included(x) => Bound::Included(x.clone()),
670 Bound::Excluded(x) => Bound::Excluded(x.clone()),
675 #[stable(feature = "collections_range", since = "1.28.0")]
676 /// `RangeBounds` is implemented by Rust's built-in range types, produced
677 /// by range syntax like `..`, `a..`, `..b`, `..=c`, `d..e`, or `f..=g`.
678 pub trait RangeBounds<T: ?Sized> {
679 /// Start index bound.
681 /// Returns the start value as a `Bound`.
687 /// use std::ops::Bound::*;
688 /// use std::ops::RangeBounds;
690 /// assert_eq!((..10).start_bound(), Unbounded);
691 /// assert_eq!((3..10).start_bound(), Included(&3));
694 #[stable(feature = "collections_range", since = "1.28.0")]
695 fn start_bound(&self) -> Bound<&T>;
699 /// Returns the end value as a `Bound`.
705 /// use std::ops::Bound::*;
706 /// use std::ops::RangeBounds;
708 /// assert_eq!((3..).end_bound(), Unbounded);
709 /// assert_eq!((3..10).end_bound(), Excluded(&10));
712 #[stable(feature = "collections_range", since = "1.28.0")]
713 fn end_bound(&self) -> Bound<&T>;
715 /// Returns `true` if `item` is contained in the range.
720 /// assert!( (3..5).contains(&4));
721 /// assert!(!(3..5).contains(&2));
723 /// assert!( (0.0..1.0).contains(&0.5));
724 /// assert!(!(0.0..1.0).contains(&f32::NAN));
725 /// assert!(!(0.0..f32::NAN).contains(&0.5));
726 /// assert!(!(f32::NAN..1.0).contains(&0.5));
727 #[stable(feature = "range_contains", since = "1.35.0")]
728 fn contains<U>(&self, item: &U) -> bool
731 U: ?Sized + PartialOrd<T>,
733 (match self.start_bound() {
734 Included(ref start) => *start <= item,
735 Excluded(ref start) => *start < item,
737 }) && (match self.end_bound() {
738 Included(ref end) => item <= *end,
739 Excluded(ref end) => item < *end,
745 use self::Bound::{Excluded, Included, Unbounded};
747 #[stable(feature = "collections_range", since = "1.28.0")]
748 impl<T: ?Sized> RangeBounds<T> for RangeFull {
749 fn start_bound(&self) -> Bound<&T> {
752 fn end_bound(&self) -> Bound<&T> {
757 #[stable(feature = "collections_range", since = "1.28.0")]
758 impl<T> RangeBounds<T> for RangeFrom<T> {
759 fn start_bound(&self) -> Bound<&T> {
760 Included(&self.start)
762 fn end_bound(&self) -> Bound<&T> {
767 #[stable(feature = "collections_range", since = "1.28.0")]
768 impl<T> RangeBounds<T> for RangeTo<T> {
769 fn start_bound(&self) -> Bound<&T> {
772 fn end_bound(&self) -> Bound<&T> {
777 #[stable(feature = "collections_range", since = "1.28.0")]
778 impl<T> RangeBounds<T> for Range<T> {
779 fn start_bound(&self) -> Bound<&T> {
780 Included(&self.start)
782 fn end_bound(&self) -> Bound<&T> {
787 #[stable(feature = "collections_range", since = "1.28.0")]
788 impl<T> RangeBounds<T> for RangeInclusive<T> {
789 fn start_bound(&self) -> Bound<&T> {
790 Included(&self.start)
792 fn end_bound(&self) -> Bound<&T> {
797 #[stable(feature = "collections_range", since = "1.28.0")]
798 impl<T> RangeBounds<T> for RangeToInclusive<T> {
799 fn start_bound(&self) -> Bound<&T> {
802 fn end_bound(&self) -> Bound<&T> {
807 #[stable(feature = "collections_range", since = "1.28.0")]
808 impl<T> RangeBounds<T> for (Bound<T>, Bound<T>) {
809 fn start_bound(&self) -> Bound<&T> {
811 (Included(ref start), _) => Included(start),
812 (Excluded(ref start), _) => Excluded(start),
813 (Unbounded, _) => Unbounded,
817 fn end_bound(&self) -> Bound<&T> {
819 (_, Included(ref end)) => Included(end),
820 (_, Excluded(ref end)) => Excluded(end),
821 (_, Unbounded) => Unbounded,
826 #[stable(feature = "collections_range", since = "1.28.0")]
827 impl<'a, T: ?Sized + 'a> RangeBounds<T> for (Bound<&'a T>, Bound<&'a T>) {
828 fn start_bound(&self) -> Bound<&T> {
832 fn end_bound(&self) -> Bound<&T> {
837 #[stable(feature = "collections_range", since = "1.28.0")]
838 impl<T> RangeBounds<T> for RangeFrom<&T> {
839 fn start_bound(&self) -> Bound<&T> {
842 fn end_bound(&self) -> Bound<&T> {
847 #[stable(feature = "collections_range", since = "1.28.0")]
848 impl<T> RangeBounds<T> for RangeTo<&T> {
849 fn start_bound(&self) -> Bound<&T> {
852 fn end_bound(&self) -> Bound<&T> {
857 #[stable(feature = "collections_range", since = "1.28.0")]
858 impl<T> RangeBounds<T> for Range<&T> {
859 fn start_bound(&self) -> Bound<&T> {
862 fn end_bound(&self) -> Bound<&T> {
867 #[stable(feature = "collections_range", since = "1.28.0")]
868 impl<T> RangeBounds<T> for RangeInclusive<&T> {
869 fn start_bound(&self) -> Bound<&T> {
872 fn end_bound(&self) -> Bound<&T> {
877 #[stable(feature = "collections_range", since = "1.28.0")]
878 impl<T> RangeBounds<T> for RangeToInclusive<&T> {
879 fn start_bound(&self) -> Bound<&T> {
882 fn end_bound(&self) -> Bound<&T> {