Struct core::range::Range

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

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

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

impl<Idx: Step> Range<Idx>

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));

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

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));

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());

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

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

fn clone(&self) -> Range<Idx>

Returns a copy of the value.

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

Performs copy-assignment from source.

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

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

Formats the value using the given formatter.

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

fn default() -> Range<Idx>

Returns the “default value” for a type.

impl<T> From<Range<T>> for Range<T>

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

Converts to this type from the input type.

impl<T> From<Range<T>> for Range<T>

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

Converts to this type from the input type.

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

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

Feeds this value into the given Hasher.

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

where Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<A: Step> IntoIterator for Range<A>

type Item = A

The type of the elements being iterated over.

type IntoIter = IterRange<A>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

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

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

This method tests for self and other values to be equal, and is used by ==.

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.

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

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

Start index bound.

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

End index bound.

fn contains<U>(&self, item: &U) -> bool

where T: PartialOrd<U>, U: ?Sized + PartialOrd<T>,

Returns true if item is contained in the range.

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

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

Start index bound.

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

End index bound.

fn contains<U>(&self, item: &U) -> bool

where T: PartialOrd<U>, U: ?Sized + PartialOrd<T>,

Returns true if item is contained in the range.

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

type Output = [T]

The output type returned by methods.

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.

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.

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.

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.

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.

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.

impl SliceIndex<str> for Range<usize>

type Output = str

The output type returned by methods.

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.

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.

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.

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.

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.

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.

impl<Idx: Copy> Copy for Range<Idx>

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

impl<Idx> StructuralPartialEq for Range<Idx>