Struct core::range::Range

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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());
Run

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: Step> Range<Idx>

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pub fn iter(&self) -> IterRange<Idx>

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

Create 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));
Run
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impl<Idx: PartialOrd<Idx>> Range<Idx>

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

🔬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));
Run
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pub fn is_empty(&self) -> bool

🔬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());
Run

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());
Run

Trait Implementations§

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

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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> Debug for Range<Idx>

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

Formats the value using the given formatter. Read more
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impl<Idx: Default> Default for Range<Idx>

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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>) -> Self

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>) -> Self

Converts to this type from the input type.
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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
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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
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impl<A: Step> IntoIterator for Range<A>

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type Item = A

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

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more
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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 ==.
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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.
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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: ?Sized + PartialOrd<T>,

Returns true if item is contained in the range. 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: ?Sized + PartialOrd<T>,

Returns true if item is contained in the range. 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. 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.
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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. 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.
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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<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<&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.
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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.
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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.
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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.
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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.
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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.
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impl<Idx: Copy> Copy for Range<Idx>

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

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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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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dst. Read more
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impl<T> CloneToUninit for T
where T: Copy,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dst. 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, 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.