1.0.0[][src]Struct core::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 x >= start and x < end. It is empty unless start < end.


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    ]);  // Range
assert_eq!(arr[1..=3], [  1,2,3  ]);Run


start: Idx

The lower bound of the range (inclusive).

end: Idx

The upper bound of the range (exclusive).


impl<Idx: PartialOrd<Idx>> Range<Idx>[src]

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

Returns true if item is contained in the range.


use std::f32;

assert!( (3..5).contains(&3));
assert!( (3..5).contains(&4));


assert!( (0.0..1.0).contains(&0.5));

pub fn is_empty(&self) -> bool[src]

🔬 This is a nightly-only experimental API. (range_is_empty #48111)

recently added

Returns true if the range contains no items.



assert!( (3..3).is_empty());
assert!( (3..2).is_empty());Run

The range is empty if either side is incomparable:


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

Trait Implementations

impl<T> RangeBounds<T> for Range<T>1.28.0[src]

impl<'_, T> RangeBounds<T> for Range<&'_ T>1.28.0[src]

impl<Idx: PartialEq> PartialEq<Range<Idx>> for Range<Idx>[src]

impl<Idx: Eq> Eq for Range<Idx>[src]

impl<Idx: Clone> Clone for Range<Idx>[src]

impl<A: Step> Iterator for Range<A>[src]

type Item = A

The type of the elements being iterated over.

impl<A: Step> DoubleEndedIterator for Range<A>[src]

impl ExactSizeIterator for Range<usize>[src]

impl ExactSizeIterator for Range<u8>[src]

impl ExactSizeIterator for Range<u16>[src]

impl ExactSizeIterator for Range<u32>[src]

impl ExactSizeIterator for Range<isize>[src]

impl ExactSizeIterator for Range<i8>[src]

impl ExactSizeIterator for Range<i16>[src]

impl ExactSizeIterator for Range<i32>[src]

impl<A: Step> FusedIterator for Range<A>1.26.0[src]

impl TrustedLen for Range<usize>[src]

impl TrustedLen for Range<isize>[src]

impl TrustedLen for Range<u8>[src]

impl TrustedLen for Range<i8>[src]

impl TrustedLen for Range<u16>[src]

impl TrustedLen for Range<i16>[src]

impl TrustedLen for Range<u32>[src]

impl TrustedLen for Range<i32>[src]

impl TrustedLen for Range<u64>[src]

impl TrustedLen for Range<i64>[src]

impl TrustedLen for Range<u128>[src]

impl TrustedLen for Range<i128>[src]

impl<T> SliceIndex<[T]> for Range<usize>1.15.0[src]

type Output = [T]

The output type returned by methods.

impl SliceIndex<str> for Range<usize>1.20.0[src]

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 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.


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

type Output = str

The output type returned by methods.

impl<Idx: Hash> Hash for Range<Idx>[src]

impl<Idx: Debug> Debug for Range<Idx>[src]

Auto Trait Implementations

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

Blanket Implementations

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

impl<T> From<T> for T[src]

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.

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

type Error = Infallible

The type returned in the event of a conversion error.

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

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

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