Struct std::ops::Range

pub struct Range<Idx> {
    pub start: Idx,
    pub end: Idx,
}

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());

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   ]);

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> Range<Idx>
where
    Idx: PartialOrd,

1.35.0source

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

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));

1.47.0source

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());

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());

Trait Implementations

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impl<Idx> Clone for Range<Idx>
where
    Idx: Clone,

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fn clone(&self) -> Range<Idx> ⓘ

Returns a copy of the value. Read more

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

Performs copy-assignment from source. Read more

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impl<Idx> Debug for Range<Idx>
where
    Idx: Debug,

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

Formats the value using the given formatter. Read more

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impl<Idx> Default for Range<Idx>
where
    Idx: Default,

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fn default() -> Range<Idx> ⓘ

Returns the “default value” for a type. Read more

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impl<A> DoubleEndedIterator for Range<A>
where
    A: Step,

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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 nth element from the end of the iterator. Read more

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fn advance_back_by(&mut self, n: usize) -> Result<(), NonZeroUsize>

🔬This is a nightly-only experimental API. (iter_advance_by #77404)

Advances the iterator from the back by n elements. Read more

1.27.0source

fn try_rfold<B, F, R>(&mut self, init: B, f: F) -> R
where
    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

1.27.0source

fn rfold<B, F>(self, init: B, f: F) -> B
where
    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

1.27.0source

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

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impl ExactSizeIterator for Range<i16>

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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

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impl ExactSizeIterator for Range<i32>

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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

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impl ExactSizeIterator for Range<i8>

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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

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impl ExactSizeIterator for Range<isize>

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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

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impl ExactSizeIterator for Range<u16>

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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

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impl ExactSizeIterator for Range<u32>

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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

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impl ExactSizeIterator for Range<u8>

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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

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impl ExactSizeIterator for Range<usize>

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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

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impl<Idx> Hash for Range<Idx>
where
    Idx: Hash,

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

Feeds this value into the given Hasher. Read more

1.3.0source

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

Feeds a slice of this type into the given Hasher. Read more

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impl Index<Range<usize>> for String

type Output = str

The returned type after indexing.

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fn index(&self, index: Range<usize>) -> &str

Performs the indexing (container[index]) operation. Read more

1.3.0source

impl IndexMut<Range<usize>> for String

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fn index_mut(&mut self, index: Range<usize>) -> &mut str

Performs the mutable indexing (container[index]) operation. Read more

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impl<A> Iterator for Range<A>
where
    A: Step,

type Item = A

The type of the elements being iterated over.

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fn next(&mut self) -> Option<A>

Advances the iterator and returns the next value. Read more

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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 nth 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<(), NonZeroUsize>

🔬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

1.28.0source

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

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

Takes two iterators and creates a new iterator over both in sequence. Read more

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fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::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

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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

1.21.0source

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

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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

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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

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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

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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

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

Creates an iterator that skips elements based on a predicate. Read more

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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

1.57.0source

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

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

Creates an iterator that skips the first n elements. Read more

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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

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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

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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

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

Creates an iterator which ends after the first None. Read more

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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

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

Borrows an iterator, rather than consuming it. Read more

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

Transforms an iterator into a collection. Read more

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fn collect_into<E>(self, collection: &mut E) -> &mut E
where
    E: Extend<Self::Item>,
    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

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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, P>(self, predicate: P) -> usize
where
    T: 'a,
    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) -> bool
where
    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

1.27.0source

fn try_fold<B, F, R>(&mut self, init: B, f: F) -> R
where
    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

1.27.0source

fn try_for_each<F, R>(&mut self, f: F) -> R
where
    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

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

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

1.51.0source

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 as Try>::Output>>>::TryType
where
    Self: Sized,
    F: FnMut(Self::Item, Self::Item) -> R,
    R: Try<Output = Self::Item>,
    <R as Try>::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

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

Tests if every element of the iterator matches a predicate. Read more

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

Tests if any element of the iterator matches a predicate. Read more

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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

1.30.0source

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>>>::TryType
where
    Self: Sized,
    F: FnMut(&Self::Item) -> R,
    R: Try<Output = bool>,
    <R as Try>::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

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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

1.6.0source

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

Returns the element that gives the maximum value from the specified function. Read more

1.15.0source

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

1.6.0source

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

Returns the element that gives the minimum value from the specified function. Read more

1.15.0source

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

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

Reverses an iterator’s direction. Read more

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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

1.36.0source

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

Creates an iterator which copies all of its elements. Read more

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

Creates an iterator which clones all of its elements. Read more

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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

1.11.0source

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

Sums the elements of an iterator. Read more

1.11.0source

fn product<P>(self) -> P
where
    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) -> Ordering
where
    Self: Sized,
    I: IntoIterator,
    F: FnMut(Self::Item, <I as IntoIterator>::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

1.5.0source

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

1.5.0source

fn eq<I>(self, other: I) -> bool
where
    I: IntoIterator,
    Self::Item: PartialEq<<I as IntoIterator>::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) -> bool
where
    Self: Sized,
    I: IntoIterator,
    F: FnMut(Self::Item, <I as IntoIterator>::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

1.5.0source

fn ne<I>(self, other: I) -> bool
where
    I: IntoIterator,
    Self::Item: PartialEq<<I as IntoIterator>::Item>,
    Self: Sized,

Determines if the elements of this Iterator are not equal to those of another. Read more

1.5.0source

fn lt<I>(self, other: I) -> bool
where
    I: IntoIterator,
    Self::Item: PartialOrd<<I as IntoIterator>::Item>,
    Self: Sized,

Determines if the elements of this Iterator are lexicographically less than those of another. Read more

1.5.0source

fn le<I>(self, other: I) -> bool
where
    I: IntoIterator,
    Self::Item: PartialOrd<<I as IntoIterator>::Item>,
    Self: Sized,

Determines if the elements of this Iterator are lexicographically less or equal to those of another. Read more

1.5.0source

fn gt<I>(self, other: I) -> bool
where
    I: IntoIterator,
    Self::Item: PartialOrd<<I as IntoIterator>::Item>,
    Self: Sized,

Determines if the elements of this Iterator are lexicographically greater than those of another. Read more

1.5.0source

fn ge<I>(self, other: I) -> bool
where
    I: IntoIterator,
    Self::Item: PartialOrd<<I as IntoIterator>::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) -> bool
where
    Self: Sized,
    F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,

🔬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) -> bool
where
    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

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impl<Idx> PartialEq for Range<Idx>
where
    Idx: PartialEq,

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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 ==.

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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.

1.28.0source

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

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fn start_bound(&self) -> Bound<&T>

Start index bound. Read more

source

fn end_bound(&self) -> Bound<&T>

End index bound. Read more

1.35.0source

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

Returns true if item is contained in the range. Read more

1.28.0source

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

source

fn start_bound(&self) -> Bound<&T>

Start index bound. Read more

source

fn end_bound(&self) -> Bound<&T>

End index bound. Read more

1.35.0source

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

Returns true if item is contained in the range. Read more

1.15.0 (const: unstable)source

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

type Output = [T]

The output type returned by methods.

const: unstablesource

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: unstablesource

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: unstablesource

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

🔬This is a nightly-only experimental API. (slice_index_methods)

Returns a shared reference 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 reference is not used.

const: unstablesource

unsafe fn get_unchecked_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, 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 reference is not used.

const: unstablesource

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: unstablesource

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];

type Output = str

The output type returned by methods.

const: unstablesource

fn get(self, slice: &str) -> Option<&<Range<usize> as SliceIndex<str>>::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: unstablesource

fn get_mut(
    self,
    slice: &mut str
) -> Option<&mut <Range<usize> as SliceIndex<str>>::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: unstablesource

unsafe fn get_unchecked(
    self,
    slice: *const str
) -> *const <Range<usize> as SliceIndex<str>>::Output

🔬This is a nightly-only experimental API. (slice_index_methods)

Returns a shared reference 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 reference is not used.

const: unstablesource

unsafe fn get_unchecked_mut(
    self,
    slice: *mut str
) -> *mut <Range<usize> as SliceIndex<str>>::Output

🔬This is a nightly-only experimental API. (slice_index_methods)

Returns a mutable reference 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 reference is not used.

const: unstablesource

fn index(self, slice: &str) -> &<Range<usize> as SliceIndex<str>>::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: unstablesource

fn index_mut(
    self,
    slice: &mut str
) -> &mut <Range<usize> as SliceIndex<str>>::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.

source

impl<Idx> Eq for Range<Idx>
where
    Idx: Eq,

1.26.0source

impl<A> FusedIterator for Range<A>
where
    A: Step,

source

impl<Idx> StructuralEq for Range<Idx>

source

impl<Idx> StructuralPartialEq for Range<Idx>

source

impl<A> TrustedLen for Range<A>
where
    A: TrustedStep,

Auto Trait Implementations

impl<Idx> RefUnwindSafe for Range<Idx>
where
    Idx: RefUnwindSafe,

impl<Idx> Send for Range<Idx>
where
    Idx: Send,

impl<Idx> Sync for Range<Idx>
where
    Idx: Sync,

impl<Idx> Unpin for Range<Idx>
where
    Idx: Unpin,

impl<Idx> UnwindSafe for Range<Idx>
where
    Idx: UnwindSafe,

Blanket Implementations

source

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

source

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

source

impl<T> Borrow<T> for T
where
    T: ?Sized,

source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

source

impl<T> BorrowMut<T> for T
where
    T: ?Sized,

source

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

Mutably borrows from an owned value. Read more

source

impl<T> From<T> for T

source

fn from(t: T) -> T

Returns the argument unchanged.

source

impl<T, U> Into<U> for T
where
    U: From<T>,

source

fn into(self) -> U

Calls U::from(self).

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

source

impl<I> IntoIterator for I
where
    I: Iterator,

type Item = <I as Iterator>::Item

The type of the elements being iterated over.

type IntoIter = I

Which kind of iterator are we turning this into?

const: unstablesource

fn into_iter(self) -> I

Creates an iterator from a value. Read more

source

impl<T> ToOwned for T
where
    T: Clone,

type Owned = T

The resulting type after obtaining ownership.

source

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

source

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

source

impl<T, U> TryFrom<U> for T
where
    U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

source

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

source

impl<T, U> TryInto<U> for T
where
    U: TryFrom<T>,

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

The type returned in the event of a conversion error.

source

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/ops/struct.Range.html

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