Range in std::range - Rust
Description: A (half-open) range bounded inclusively below and exclusively above (`start..end` in a future edition).

## Range

# Struct Range

Source

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

🔬This is a nightly-only experimental API. (`new_range_api` #125687)
Expand description

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

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

## §Examples

    #![feature(new_range_api)]
    use core::range::Range;

    assert_eq!(Range::from(3..5), Range { start: 3, end: 5 });
    assert_eq!(3 + 4 + 5, Range::from(3..6).into_iter().sum());

## Fields§

§`start: Idx`
🔬This is a nightly-only experimental API. (`new_range_api` #125687)

The lower bound of the range (inclusive).

§`end: Idx`
🔬This is a nightly-only experimental API. (`new_range_api` #125687)

The upper bound of the range (exclusive).

## Implementations§

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### impl<Idx> Range<Idx>
where Idx: Step,

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#### pub fn iter(&self) -> RangeIter<Idx> ⓘ

🔬This is a nightly-only experimental API. (`new_range_api` #125687)

Creates an iterator over the elements within this range.

Shorthand for `.clone().into_iter()`

##### §Examples

    #![feature(new_range_api)]
    use core::range::Range;

    let mut i = Range::from(3..9).iter().map(|n| n*n);
    assert_eq!(i.next(), Some(9));
    assert_eq!(i.next(), Some(16));
    assert_eq!(i.next(), Some(25));

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

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

🔬This is a nightly-only experimental API. (`new_range_api` #125687)

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

##### §Examples

    #![feature(new_range_api)]
    use core::range::Range;

    assert!(!Range::from(3..5).contains(&2));
    assert!( Range::from(3..5).contains(&3));
    assert!( Range::from(3..5).contains(&4));
    assert!(!Range::from(3..5).contains(&5));

    assert!(!Range::from(3..3).contains(&3));
    assert!(!Range::from(3..2).contains(&3));

    assert!( Range::from(0.0..1.0).contains(&0.5));
    assert!(!Range::from(0.0..1.0).contains(&f32::NAN));
    assert!(!Range::from(0.0..f32::NAN).contains(&0.5));
    assert!(!Range::from(f32::NAN..1.0).contains(&0.5));

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#### pub const fn is_empty(&self) -> bool
where Idx: PartialOrd,

🔬This is a nightly-only experimental API. (`new_range_api` #125687)

Returns `true` if the range contains no items.

##### §Examples

    #![feature(new_range_api)]
    use core::range::Range;

    assert!(!Range::from(3..5).is_empty());
    assert!( Range::from(3..3).is_empty());
    assert!( Range::from(3..2).is_empty());

The range is empty if either side is incomparable:

    #![feature(new_range_api)]
    use core::range::Range;

    assert!(!Range::from(3.0..5.0).is_empty());
    assert!( Range::from(3.0..f32::NAN).is_empty());
    assert!( Range::from(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 duplicate of the value. Read more
1.0.0 · Source§

#### 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<T> From<Range<T>> for Range<T>

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#### fn from(value: Range<T>) -> Range<T> ⓘ

Converts to this type from the input type.
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### impl<T> From<Range<T>> for Range<T>

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#### fn from(value: Range<T>) -> Range<T>

Converts to this type from the input type.
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### impl GetDisjointMutIndex for Range<usize>

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#### fn is_in_bounds(&self, len: usize) -> bool

🔬This is a nightly-only experimental API. (`get_disjoint_mut_helpers`)
Returns `true` if `self` is in bounds for `len` slice elements.
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#### fn is_overlapping(&self, other: &Range<usize>) -> bool

🔬This is a nightly-only experimental API. (`get_disjoint_mut_helpers`)
Returns `true` if `self` overlaps with `other`. 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
1.3.0 · Source§

#### 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<T> IntoBounds<T> for Range<T>

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#### fn into_bounds(self) -> (Bound<T>, Bound<T>)

🔬This is a nightly-only experimental API. (`range_into_bounds` #136903)
Convert this range into the start and end bounds. Returns `(start_bound, end_bound)`. Read more
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#### fn intersect<R>(self, other: R) -> (Bound<T>, Bound<T>)
where Self: Sized, T: Ord, R: IntoBounds<T>,

🔬This is a nightly-only experimental API. (`range_into_bounds` #136903)
Compute the intersection of `self` and `other`. Read more
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### impl<A> IntoIterator for Range<A>
where A: Step,

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#### type Item = A

The type of the elements being iterated over.
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#### type IntoIter = RangeIter<A>

Which kind of iterator are we turning this into?
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#### fn into_iter(self) -> <Range<A> as IntoIterator>::IntoIter

Creates an iterator from a value. 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

Tests for `self` and `other` values to be equal, and is used by `==`.
1.0.0 · Source§

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

Tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl<T> RangeBounds<T> for Range<&T>

If you need to use this implementation where `T` is unsized, consider using the `RangeBounds` impl for a 2-tuple of `Bound<&T>`, i.e. replace `start..end` with `(Bound::Included(start), Bound::Excluded(end))`.

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

Start index bound. Read more
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#### fn end_bound(&self) -> Bound<&T>

End index bound. Read more
1.35.0 · Source§

#### 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
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#### fn is_empty(&self) -> bool
where T: PartialOrd,

🔬This is a nightly-only experimental API. (`range_bounds_is_empty` #137300)
Returns `true` if the range contains no items. One-sided ranges (`RangeFrom`, etc) always return `false`. Read more
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### impl<T> RangeBounds<T> for Range<T>

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

Start index bound. Read more
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#### fn end_bound(&self) -> Bound<&T>

End index bound. Read more
1.35.0 · Source§

#### 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
Source§

#### fn is_empty(&self) -> bool
where T: PartialOrd,

🔬This is a nightly-only experimental API. (`range_bounds_is_empty` #137300)
Returns `true` if the range contains no items. One-sided ranges (`RangeFrom`, etc) always return `false`. Read more
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### impl<T> SliceIndex<[T]> for Range<usize>

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#### type Output = [T]

The output type returned by methods.
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#### 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.
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#### 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.
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#### 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. Read more
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#### 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. Read more
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#### 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.
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#### 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.
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### impl SliceIndex<ByteStr> for Range<usize>

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#### type Output = ByteStr

The output type returned by methods.
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#### fn get( self, slice: &ByteStr, ) -> Option<&<Range<usize> as SliceIndex<ByteStr>>::Output>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, if in bounds.
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#### fn get_mut( self, slice: &mut ByteStr, ) -> Option<&mut <Range<usize> as SliceIndex<ByteStr>>::Output>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, if in bounds.
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#### unsafe fn get_unchecked( self, slice: *const ByteStr, ) -> *const <Range<usize> as SliceIndex<ByteStr>>::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. Read more
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#### unsafe fn get_unchecked_mut( self, slice: *mut ByteStr, ) -> *mut <Range<usize> as SliceIndex<ByteStr>>::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. Read more
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#### fn index( self, slice: &ByteStr, ) -> &<Range<usize> as SliceIndex<ByteStr>>::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.
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#### fn index_mut( self, slice: &mut ByteStr, ) -> &mut <Range<usize> as SliceIndex<ByteStr>>::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.
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### impl SliceIndex<str> for Range<usize>

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#### type Output = str

The output type returned by methods.
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#### 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.
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#### 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.
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#### 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 pointer to the output at this location, without performing any bounds checking. Read more
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#### 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 pointer to the output at this location, without performing any bounds checking. Read more
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#### 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.
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#### 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.
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### impl<T> CloneFromCell for Range<T>
where T: CloneFromCell,

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### impl<Idx> Copy for Range<Idx>
where Idx: Copy,

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

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### impl<Idx> StructuralPartialEq for Range<Idx>

## Auto Trait Implementations§

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### impl<Idx> Freeze for Range<Idx>
where Idx: Freeze,

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

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

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

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

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

## Blanket Implementations§

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### impl<T> Any for T
where 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 T
where 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 T
where 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> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit` #126799)
Performs copy-assignment from `self` to `dest`. 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 T
where 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<T> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for T
where 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 T
where 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.