# Struct core::ops::Range

1.0.0 · source ·
``````pub struct Range<Idx> {
pub start: Idx,
pub end: Idx,
}``````
Expand description

A (half-open) range bounded inclusively below and exclusively above (`start..end`).

The range `start..end` contains all values with `start <= x < end`. It is empty if `start >= end`.

## §Examples

The `start..end` syntax is a `Range`:

``````assert_eq!((3..5), std::ops::Range { start: 3, end: 5 });
assert_eq!(3 + 4 + 5, (3..6).sum());``````
Run
``````let arr = [0, 1, 2, 3, 4];
assert_eq!(arr[ ..  ], [0, 1, 2, 3, 4]);
assert_eq!(arr[ .. 3], [0, 1, 2      ]);
assert_eq!(arr[ ..=3], [0, 1, 2, 3   ]);
assert_eq!(arr[1..  ], [   1, 2, 3, 4]);
assert_eq!(arr[1.. 3], [   1, 2      ]); // This is a `Range`
assert_eq!(arr[1..=3], [   1, 2, 3   ]);``````
Run

## Fields§

§`start: Idx`

The lower bound of the range (inclusive).

§`end: Idx`

The upper bound of the range (exclusive).

## Implementations§

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### impl<Idx: PartialOrd<Idx>> Range<Idx>

1.35.0 · source

#### pub fn contains<U>(&self, item: &U) -> boolwhere Idx: PartialOrd<U>, U: ?Sized + PartialOrd<Idx>,

Returns `true` if `item` is contained in the range.

##### §Examples
``````assert!(!(3..5).contains(&2));
assert!( (3..5).contains(&3));
assert!( (3..5).contains(&4));
assert!(!(3..5).contains(&5));

assert!(!(3..3).contains(&3));
assert!(!(3..2).contains(&3));

assert!( (0.0..1.0).contains(&0.5));
assert!(!(0.0..1.0).contains(&f32::NAN));
assert!(!(0.0..f32::NAN).contains(&0.5));
assert!(!(f32::NAN..1.0).contains(&0.5));``````
Run
1.47.0 · source

#### pub fn is_empty(&self) -> bool

Returns `true` if the range contains no items.

##### §Examples
``````assert!(!(3..5).is_empty());
assert!( (3..3).is_empty());
assert!( (3..2).is_empty());``````
Run

The range is empty if either side is incomparable:

``````assert!(!(3.0..5.0).is_empty());
assert!( (3.0..f32::NAN).is_empty());
assert!( (f32::NAN..5.0).is_empty());``````
Run

## Trait Implementations§

1.0.0 · source§

### impl<Idx: Clone> Clone for Range<Idx>

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#### fn clone(&self) -> Range<Idx> ⓘ

Returns a copy of the value. Read more
1.0.0 · source§

#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
1.0.0 · source§

### impl<Idx: Debug> Debug for Range<Idx>

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#### fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
1.0.0 · source§

### impl<Idx: Default> Default for Range<Idx>

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#### fn default() -> Range<Idx> ⓘ

Returns the “default value” for a type. Read more
1.0.0 · source§

### impl<A: Step> DoubleEndedIterator for Range<A>

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#### fn next_back(&mut self) -> Option<A>

Removes and returns an element from the end of the iterator. Read more
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#### fn nth_back(&mut self, n: usize) -> Option<A>

Returns the `n`th element from the end of the iterator. Read more
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#### fn advance_back_by(&mut self, n: usize) -> Result<(), NonZero<usize>>

🔬This is a nightly-only experimental API. (`iter_advance_by` #77404)
Advances the iterator from the back by `n` elements. Read more
1.27.0 · source§

#### fn try_rfold<B, F, R>(&mut self, init: B, f: F) -> Rwhere Self: Sized, F: FnMut(B, Self::Item) -> R, R: Try<Output = B>,

This is the reverse version of `Iterator::try_fold()`: it takes elements starting from the back of the iterator. Read more
1.27.0 · source§

#### fn rfold<B, F>(self, init: B, f: F) -> Bwhere Self: Sized, F: FnMut(B, Self::Item) -> B,

An iterator method that reduces the iterator’s elements to a single, final value, starting from the back. Read more
1.27.0 · source§

#### fn rfind<P>(&mut self, predicate: P) -> Option<Self::Item>where Self: Sized, P: FnMut(&Self::Item) -> bool,

Searches for an element of an iterator from the back that satisfies a predicate. Read more
1.0.0 · source§

### impl ExactSizeIterator for Range<i16>

1.0.0 · source§

#### fn len(&self) -> usize

Returns the exact remaining length of the iterator. Read more
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#### fn is_empty(&self) -> bool

🔬This is a nightly-only experimental API. (`exact_size_is_empty` #35428)
Returns `true` if the iterator is empty. Read more
1.0.0 · source§

### impl ExactSizeIterator for Range<i32>

1.0.0 · source§

#### fn len(&self) -> usize

Returns the exact remaining length of the iterator. Read more
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#### fn is_empty(&self) -> bool

🔬This is a nightly-only experimental API. (`exact_size_is_empty` #35428)
Returns `true` if the iterator is empty. Read more
1.0.0 · source§

### impl ExactSizeIterator for Range<i8>

1.0.0 · source§

#### fn len(&self) -> usize

Returns the exact remaining length of the iterator. Read more
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#### fn is_empty(&self) -> bool

🔬This is a nightly-only experimental API. (`exact_size_is_empty` #35428)
Returns `true` if the iterator is empty. Read more
1.0.0 · source§

### impl ExactSizeIterator for Range<isize>

1.0.0 · source§

#### fn len(&self) -> usize

Returns the exact remaining length of the iterator. Read more
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#### fn is_empty(&self) -> bool

🔬This is a nightly-only experimental API. (`exact_size_is_empty` #35428)
Returns `true` if the iterator is empty. Read more
1.0.0 · source§

### impl ExactSizeIterator for Range<u16>

1.0.0 · source§

#### fn len(&self) -> usize

Returns the exact remaining length of the iterator. Read more
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#### fn is_empty(&self) -> bool

🔬This is a nightly-only experimental API. (`exact_size_is_empty` #35428)
Returns `true` if the iterator is empty. Read more
1.0.0 · source§

### impl ExactSizeIterator for Range<u32>

1.0.0 · source§

#### fn len(&self) -> usize

Returns the exact remaining length of the iterator. Read more
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#### fn is_empty(&self) -> bool

🔬This is a nightly-only experimental API. (`exact_size_is_empty` #35428)
Returns `true` if the iterator is empty. Read more
1.0.0 · source§

### impl ExactSizeIterator for Range<u8>

1.0.0 · source§

#### fn len(&self) -> usize

Returns the exact remaining length of the iterator. Read more
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#### fn is_empty(&self) -> bool

🔬This is a nightly-only experimental API. (`exact_size_is_empty` #35428)
Returns `true` if the iterator is empty. Read more
1.0.0 · source§

### impl ExactSizeIterator for Range<usize>

1.0.0 · source§

#### fn len(&self) -> usize

Returns the exact remaining length of the iterator. Read more
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#### fn is_empty(&self) -> bool

🔬This is a nightly-only experimental API. (`exact_size_is_empty` #35428)
Returns `true` if the iterator is empty. Read more
1.0.0 · source§

### impl<Idx: Hash> Hash for Range<Idx>

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#### fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given `Hasher`. Read more
1.3.0 · source§

#### fn hash_slice<H: Hasher>(data: &[Self], state: &mut H)where Self: Sized,

Feeds a slice of this type into the given `Hasher`. Read more
1.0.0 · source§

### impl<A: Step> Iterator for Range<A>

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#### type Item = A

The type of the elements being iterated over.
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#### fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the iterator. Read more
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#### fn count(self) -> usize

Consumes the iterator, counting the number of iterations and returning it. Read more
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#### fn nth(&mut self, n: usize) -> Option<A>

Returns the `n`th element of the iterator. Read more
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#### fn last(self) -> Option<A>

Consumes the iterator, returning the last element. Read more
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#### fn min(self) -> Option<A>where A: Ord,

Returns the minimum element of an iterator. Read more
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#### fn max(self) -> Option<A>where A: Ord,

Returns the maximum element of an iterator. Read more
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#### fn is_sorted(self) -> bool

🔬This is a nightly-only experimental API. (`is_sorted` #53485)
Checks if the elements of this iterator are sorted. Read more
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#### fn advance_by(&mut self, n: usize) -> Result<(), NonZero<usize>>

🔬This is a nightly-only experimental API. (`iter_advance_by` #77404)
Advances the iterator by `n` elements. Read more
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#### fn next_chunk<const N: usize>( &mut self ) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where Self: Sized,

🔬This is a nightly-only experimental API. (`iter_next_chunk` #98326)
Advances the iterator and returns an array containing the next `N` values. Read more
1.28.0 · source§

#### fn step_by(self, step: usize) -> StepBy<Self> ⓘwhere Self: Sized,

Creates an iterator starting at the same point, but stepping by the given amount at each iteration. Read more
1.0.0 · source§

#### fn chain<U>(self, other: U) -> Chain<Self, U::IntoIter> ⓘwhere Self: Sized, U: IntoIterator<Item = Self::Item>,

Takes two iterators and creates a new iterator over both in sequence. Read more
1.0.0 · source§

#### fn zip<U>(self, other: U) -> Zip<Self, U::IntoIter> ⓘwhere Self: Sized, U: IntoIterator,

‘Zips up’ two iterators into a single iterator of pairs. Read more
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#### fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G> ⓘwhere Self: Sized, G: FnMut() -> Self::Item,

🔬This is a nightly-only experimental API. (`iter_intersperse` #79524)
Creates a new iterator which places an item generated by `separator` between adjacent items of the original iterator. Read more
1.0.0 · source§

#### fn map<B, F>(self, f: F) -> Map<Self, F> ⓘwhere Self: Sized, F: FnMut(Self::Item) -> B,

Takes a closure and creates an iterator which calls that closure on each element. Read more
1.21.0 · source§

#### fn for_each<F>(self, f: F)where Self: Sized, F: FnMut(Self::Item),

Calls a closure on each element of an iterator. Read more
1.0.0 · source§

#### fn filter<P>(self, predicate: P) -> Filter<Self, P> ⓘwhere Self: Sized, P: FnMut(&Self::Item) -> bool,

Creates an iterator which uses a closure to determine if an element should be yielded. Read more
1.0.0 · source§

#### fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> ⓘwhere Self: Sized, F: FnMut(Self::Item) -> Option<B>,

Creates an iterator that both filters and maps. Read more
1.0.0 · source§

#### fn enumerate(self) -> Enumerate<Self> ⓘwhere Self: Sized,

Creates an iterator which gives the current iteration count as well as the next value. Read more
1.0.0 · source§

#### fn peekable(self) -> Peekable<Self> ⓘwhere Self: Sized,

Creates an iterator which can use the `peek` and `peek_mut` methods to look at the next element of the iterator without consuming it. See their documentation for more information. Read more
1.0.0 · source§

#### fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> ⓘwhere Self: Sized, P: FnMut(&Self::Item) -> bool,

Creates an iterator that `skip`s elements based on a predicate. Read more
1.0.0 · source§

#### fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> ⓘwhere Self: Sized, P: FnMut(&Self::Item) -> bool,

Creates an iterator that yields elements based on a predicate. Read more
1.57.0 · source§

#### fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P> ⓘwhere Self: Sized, P: FnMut(Self::Item) -> Option<B>,

Creates an iterator that both yields elements based on a predicate and maps. Read more
1.0.0 · source§

#### fn skip(self, n: usize) -> Skip<Self> ⓘwhere Self: Sized,

Creates an iterator that skips the first `n` elements. Read more
1.0.0 · source§

#### fn take(self, n: usize) -> Take<Self> ⓘwhere Self: Sized,

Creates an iterator that yields the first `n` elements, or fewer if the underlying iterator ends sooner. Read more
1.0.0 · source§

#### fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> ⓘwhere Self: Sized, F: FnMut(&mut St, Self::Item) -> Option<B>,

An iterator adapter which, like `fold`, holds internal state, but unlike `fold`, produces a new iterator. Read more
1.0.0 · source§

#### fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> ⓘwhere Self: Sized, U: IntoIterator, F: FnMut(Self::Item) -> U,

Creates an iterator that works like map, but flattens nested structure. Read more
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#### fn map_windows<F, R, const N: usize>(self, f: F) -> MapWindows<Self, F, N> ⓘwhere Self: Sized, F: FnMut(&[Self::Item; N]) -> R,

🔬This is a nightly-only experimental API. (`iter_map_windows` #87155)
Calls the given function `f` for each contiguous window of size `N` over `self` and returns an iterator over the outputs of `f`. Like `slice::windows()`, the windows during mapping overlap as well. Read more
1.0.0 · source§

#### fn fuse(self) -> Fuse<Self> ⓘwhere Self: Sized,

Creates an iterator which ends after the first `None`. Read more
1.0.0 · source§

#### fn inspect<F>(self, f: F) -> Inspect<Self, F> ⓘwhere Self: Sized, F: FnMut(&Self::Item),

Does something with each element of an iterator, passing the value on. Read more
1.0.0 · source§

#### fn by_ref(&mut self) -> &mut Selfwhere Self: Sized,

Borrows an iterator, rather than consuming it. Read more
1.0.0 · source§

#### fn collect<B: FromIterator<Self::Item>>(self) -> Bwhere Self: Sized,

Transforms an iterator into a collection. Read more
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#### fn collect_into<E: Extend<Self::Item>>(self, collection: &mut E) -> &mut Ewhere Self: Sized,

🔬This is a nightly-only experimental API. (`iter_collect_into` #94780)
Collects all the items from an iterator into a collection. Read more
1.0.0 · source§

#### fn partition<B, F>(self, f: F) -> (B, B)where Self: Sized, B: Default + Extend<Self::Item>, F: FnMut(&Self::Item) -> bool,

Consumes an iterator, creating two collections from it. Read more
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#### fn partition_in_place<'a, T: 'a, P>(self, predicate: P) -> usizewhere Self: Sized + DoubleEndedIterator<Item = &'a mut T>, P: FnMut(&T) -> bool,

🔬This is a nightly-only experimental API. (`iter_partition_in_place` #62543)
Reorders the elements of this iterator in-place according to the given predicate, such that all those that return `true` precede all those that return `false`. Returns the number of `true` elements found. Read more
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#### fn is_partitioned<P>(self, predicate: P) -> boolwhere Self: Sized, P: FnMut(Self::Item) -> bool,

🔬This is a nightly-only experimental API. (`iter_is_partitioned` #62544)
Checks if the elements of this iterator are partitioned according to the given predicate, such that all those that return `true` precede all those that return `false`. Read more
1.27.0 · source§

#### fn try_fold<B, F, R>(&mut self, init: B, f: F) -> Rwhere Self: Sized, F: FnMut(B, Self::Item) -> R, R: Try<Output = B>,

An iterator method that applies a function as long as it returns successfully, producing a single, final value. Read more
1.27.0 · source§

#### fn try_for_each<F, R>(&mut self, f: F) -> Rwhere Self: Sized, F: FnMut(Self::Item) -> R, R: Try<Output = ()>,

An iterator method that applies a fallible function to each item in the iterator, stopping at the first error and returning that error. Read more
1.0.0 · source§

#### fn fold<B, F>(self, init: B, f: F) -> Bwhere Self: Sized, F: FnMut(B, Self::Item) -> B,

Folds every element into an accumulator by applying an operation, returning the final result. Read more
1.51.0 · source§

#### fn reduce<F>(self, f: F) -> Option<Self::Item>where Self: Sized, F: FnMut(Self::Item, Self::Item) -> Self::Item,

Reduces the elements to a single one, by repeatedly applying a reducing operation. Read more
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#### fn try_reduce<F, R>( &mut self, f: F ) -> <<R as Try>::Residual as Residual<Option<R::Output>>>::TryTypewhere Self: Sized, F: FnMut(Self::Item, Self::Item) -> R, R: Try<Output = Self::Item>, R::Residual: Residual<Option<Self::Item>>,

🔬This is a nightly-only experimental API. (`iterator_try_reduce` #87053)
Reduces the elements to a single one by repeatedly applying a reducing operation. If the closure returns a failure, the failure is propagated back to the caller immediately. Read more
1.0.0 · source§

#### fn all<F>(&mut self, f: F) -> boolwhere Self: Sized, F: FnMut(Self::Item) -> bool,

Tests if every element of the iterator matches a predicate. Read more
1.0.0 · source§

#### fn any<F>(&mut self, f: F) -> boolwhere Self: Sized, F: FnMut(Self::Item) -> bool,

Tests if any element of the iterator matches a predicate. Read more
1.0.0 · source§

#### fn find<P>(&mut self, predicate: P) -> Option<Self::Item>where Self: Sized, P: FnMut(&Self::Item) -> bool,

Searches for an element of an iterator that satisfies a predicate. Read more
1.30.0 · source§

#### fn find_map<B, F>(&mut self, f: F) -> Option<B>where Self: Sized, F: FnMut(Self::Item) -> Option<B>,

Applies function to the elements of iterator and returns the first non-none result. Read more
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#### fn try_find<F, R>( &mut self, f: F ) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryTypewhere Self: Sized, F: FnMut(&Self::Item) -> R, R: Try<Output = bool>, R::Residual: Residual<Option<Self::Item>>,

🔬This is a nightly-only experimental API. (`try_find` #63178)
Applies function to the elements of iterator and returns the first true result or the first error. Read more
1.0.0 · source§

#### fn position<P>(&mut self, predicate: P) -> Option<usize>where Self: Sized, P: FnMut(Self::Item) -> bool,

Searches for an element in an iterator, returning its index. Read more
1.6.0 · source§

#### fn max_by_key<B: Ord, F>(self, f: F) -> Option<Self::Item>where Self: Sized, F: FnMut(&Self::Item) -> B,

Returns the element that gives the maximum value from the specified function. Read more
1.15.0 · source§

#### fn max_by<F>(self, compare: F) -> Option<Self::Item>where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Ordering,

Returns the element that gives the maximum value with respect to the specified comparison function. Read more
1.6.0 · source§

#### fn min_by_key<B: Ord, F>(self, f: F) -> Option<Self::Item>where Self: Sized, F: FnMut(&Self::Item) -> B,

Returns the element that gives the minimum value from the specified function. Read more
1.15.0 · source§

#### fn min_by<F>(self, compare: F) -> Option<Self::Item>where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Ordering,

Returns the element that gives the minimum value with respect to the specified comparison function. Read more
1.0.0 · source§

#### fn rev(self) -> Rev<Self> ⓘwhere Self: Sized + DoubleEndedIterator,

Reverses an iterator’s direction. Read more
1.0.0 · source§

#### fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)where FromA: Default + Extend<A>, FromB: Default + Extend<B>, Self: Sized + Iterator<Item = (A, B)>,

Converts an iterator of pairs into a pair of containers. Read more
1.36.0 · source§

#### fn copied<'a, T>(self) -> Copied<Self> ⓘwhere Self: Sized + Iterator<Item = &'a T>, T: Copy + 'a,

Creates an iterator which copies all of its elements. Read more
1.0.0 · source§

#### fn cloned<'a, T>(self) -> Cloned<Self> ⓘwhere Self: Sized + Iterator<Item = &'a T>, T: Clone + 'a,

Creates an iterator which `clone`s all of its elements. Read more
1.0.0 · source§

#### fn cycle(self) -> Cycle<Self> ⓘwhere Self: Sized + Clone,

Repeats an iterator endlessly. Read more
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#### fn array_chunks<const N: usize>(self) -> ArrayChunks<Self, N> ⓘwhere Self: Sized,

🔬This is a nightly-only experimental API. (`iter_array_chunks` #100450)
Returns an iterator over `N` elements of the iterator at a time. Read more
1.11.0 · source§

#### fn sum<S>(self) -> Swhere Self: Sized, S: Sum<Self::Item>,

Sums the elements of an iterator. Read more
1.11.0 · source§

#### fn product<P>(self) -> Pwhere Self: Sized, P: Product<Self::Item>,

Iterates over the entire iterator, multiplying all the elements Read more
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#### fn cmp_by<I, F>(self, other: I, cmp: F) -> Orderingwhere Self: Sized, I: IntoIterator, F: FnMut(Self::Item, I::Item) -> Ordering,

🔬This is a nightly-only experimental API. (`iter_order_by` #64295)
Lexicographically compares the elements of this `Iterator` with those of another with respect to the specified comparison function. Read more
1.5.0 · source§

#### fn partial_cmp<I>(self, other: I) -> Option<Ordering>where I: IntoIterator, Self::Item: PartialOrd<I::Item>, Self: Sized,

Lexicographically compares the `PartialOrd` elements of this `Iterator` with those of another. The comparison works like short-circuit evaluation, returning a result without comparing the remaining elements. As soon as an order can be determined, the evaluation stops and a result is returned. Read more
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#### fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where Self: Sized, I: IntoIterator, F: FnMut(Self::Item, I::Item) -> Option<Ordering>,

🔬This is a nightly-only experimental API. (`iter_order_by` #64295)
Lexicographically compares the elements of this `Iterator` with those of another with respect to the specified comparison function. Read more
1.5.0 · source§

#### fn eq<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialEq<I::Item>, Self: Sized,

Determines if the elements of this `Iterator` are equal to those of another. Read more
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#### fn eq_by<I, F>(self, other: I, eq: F) -> boolwhere Self: Sized, I: IntoIterator, F: FnMut(Self::Item, I::Item) -> bool,

🔬This is a nightly-only experimental API. (`iter_order_by` #64295)
Determines if the elements of this `Iterator` are equal to those of another with respect to the specified equality function. Read more
1.5.0 · source§

#### fn ne<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialEq<I::Item>, Self: Sized,

Determines if the elements of this `Iterator` are not equal to those of another. Read more
1.5.0 · source§

#### fn lt<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialOrd<I::Item>, Self: Sized,

Determines if the elements of this `Iterator` are lexicographically less than those of another. Read more
1.5.0 · source§

#### fn le<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialOrd<I::Item>, Self: Sized,

Determines if the elements of this `Iterator` are lexicographically less or equal to those of another. Read more
1.5.0 · source§

#### fn gt<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialOrd<I::Item>, Self: Sized,

Determines if the elements of this `Iterator` are lexicographically greater than those of another. Read more
1.5.0 · source§

#### fn ge<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialOrd<I::Item>, Self: Sized,

Determines if the elements of this `Iterator` are lexicographically greater than or equal to those of another. Read more
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#### fn is_sorted_by<F>(self, compare: F) -> boolwhere Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> bool,

🔬This is a nightly-only experimental API. (`is_sorted` #53485)
Checks if the elements of this iterator are sorted using the given comparator function. Read more
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#### fn is_sorted_by_key<F, K>(self, f: F) -> boolwhere Self: Sized, F: FnMut(Self::Item) -> K, K: PartialOrd,

🔬This is a nightly-only experimental API. (`is_sorted` #53485)
Checks if the elements of this iterator are sorted using the given key extraction function. Read more
1.0.0 · source§

### impl<Idx: PartialEq> PartialEq for Range<Idx>

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#### fn eq(&self, other: &Range<Idx>) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
1.0.0 · source§

#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.28.0 · source§

### impl<T> RangeBounds<T> for Range<&T>

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1.35.0 · source§

#### fn contains<U>(&self, item: &U) -> boolwhere T: PartialOrd<U>, U: ?Sized + PartialOrd<T>,

Returns `true` if `item` is contained in the range. Read more
1.28.0 · source§

### impl<T> RangeBounds<T> for Range<T>

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1.35.0 · source§

#### fn contains<U>(&self, item: &U) -> boolwhere T: PartialOrd<U>, U: ?Sized + PartialOrd<T>,

Returns `true` if `item` is contained in the range. Read more
1.15.0 (const: unstable) · source§

### impl<T> SliceIndex<[T]> for Range<usize>

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.
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#### type Output = [T]

The output type returned by methods.
const: unstable · source§

#### fn get(self, slice: &[T]) -> Option<&[T]>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, if in bounds.
const: unstable · source§

#### fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, if in bounds.
const: unstable · source§

#### unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a pointer to the output at this location, without performing any bounds checking. Calling this method with an out-of-bounds index or a dangling `slice` pointer is undefined behavior even if the resulting pointer is not used.
const: unstable · source§

#### unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable pointer to the output at this location, without performing any bounds checking. Calling this method with an out-of-bounds index or a dangling `slice` pointer is undefined behavior even if the resulting pointer is not used.
const: unstable · source§

#### fn index(self, slice: &[T]) -> &[T]

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, panicking if out of bounds.
const: unstable · source§

#### fn index_mut(self, slice: &mut [T]) -> &mut [T]

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, panicking if out of bounds.
1.20.0 (const: unstable) · source§

### impl SliceIndex<str> for Range<usize>

Implements substring slicing with syntax `&self[begin .. end]` or `&mut self[begin .. end]`.

Returns a slice of the given string from the byte range [`begin`, `end`).

This operation is O(1).

Prior to 1.20.0, these indexing operations were still supported by direct implementation of `Index` and `IndexMut`.

#### §Panics

Panics if `begin` or `end` does not point to the starting byte offset of a character (as defined by `is_char_boundary`), if `begin > end`, or if `end > len`.

#### §Examples

``````let s = "Löwe 老虎 Léopard";
assert_eq!(&s[0 .. 1], "L");

assert_eq!(&s[1 .. 9], "öwe 老");

// these will panic:
// byte 2 lies within `ö`:
// &s[2 ..3];

// byte 8 lies within `老`
// &s[1 .. 8];

// byte 100 is outside the string
// &s[3 .. 100];``````
Run
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#### type Output = str

The output type returned by methods.
const: unstable · source§

#### fn get(self, slice: &str) -> Option<&Self::Output>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, if in bounds.
const: unstable · source§

#### fn get_mut(self, slice: &mut str) -> Option<&mut Self::Output>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, if in bounds.
const: unstable · source§

#### unsafe fn get_unchecked(self, slice: *const str) -> *const Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a pointer to the output at this location, without performing any bounds checking. Calling this method with an out-of-bounds index or a dangling `slice` pointer is undefined behavior even if the resulting pointer is not used.
const: unstable · source§

#### unsafe fn get_unchecked_mut(self, slice: *mut str) -> *mut Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable pointer to the output at this location, without performing any bounds checking. Calling this method with an out-of-bounds index or a dangling `slice` pointer is undefined behavior even if the resulting pointer is not used.
const: unstable · source§

#### fn index(self, slice: &str) -> &Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, panicking if out of bounds.
const: unstable · source§

#### fn index_mut(self, slice: &mut str) -> &mut Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, panicking if out of bounds.
1.0.0 · source§

1.26.0 · source§

1.0.0 · source§

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## Blanket Implementations§

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### impl<T> Any for Twhere T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for Twhere T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for Twhere T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for Twhere U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<I> IntoIterator for Iwhere I: Iterator,

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#### type Item = <I as Iterator>::Item

The type of the elements being iterated over.
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#### type IntoIter = I

Which kind of iterator are we turning this into?
const: unstable · source§

#### fn into_iter(self) -> I

Creates an iterator from a value. Read more
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### impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.