Struct std::ops::RangeTo

pub struct RangeTo<Idx> {
    pub end: Idx,
}

A range which is only bounded above: { x | x < end }. Use ..end (two dots) for its shorthand.

See the contains() method for its characterization.

It cannot serve as an iterator because it doesn't have a starting point.

Examples

The ..{integer} syntax is a RangeTo:

assert_eq!((..5), std::ops::RangeTo{ end: 5 });

It does not have an IntoIterator implementation, so you can't use it in a for loop directly. This won't compile:

for i in ..5 {
    // ...
}

When used as a slicing index, RangeTo produces a slice of all array elements before the index indicated by end.

let arr = [0, 1, 2, 3];
assert_eq!(arr[ .. ], [0,1,2,3]);
assert_eq!(arr[ ..3], [0,1,2  ]);  // RangeTo
assert_eq!(arr[1.. ], [  1,2,3]);
assert_eq!(arr[1..3], [  1,2  ]);

Fields

The upper bound of the range (exclusive).

Methods

impl<Idx> RangeTo<Idx> where Idx: PartialOrd<Idx> [src]

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

#![feature(range_contains)]
fn main() {
    assert!(   (..5).contains(-1_000_000_000));
    assert!(   (..5).contains(4));
    assert!( ! (..5).contains(5));
}

Trait Implementations

impl<T> RangeArgument<T> for RangeTo<T> [src]

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

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

impl<Idx> PartialEq<RangeTo<Idx>> for RangeTo<Idx> where Idx: PartialEq<Idx> [src]

fn eq(&self, __arg_0: &RangeTo<Idx>) -> bool

fn ne(&self, __arg_0: &RangeTo<Idx>) -> bool

impl<Idx> Clone for RangeTo<Idx> where Idx: Clone [src]

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

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

impl<Idx> Eq for RangeTo<Idx> where Idx: Eq [src]

impl<Idx> Debug for RangeTo<Idx> where Idx: Debug [src]

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

impl<Idx> Copy for RangeTo<Idx> where Idx: Copy [src]

impl<T> SliceIndex<T> for RangeTo<usize>

1.13.0

[src]

type Output = [T]

fn get(self, slice: &[T]) -> Option<&[T]>

fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>

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

unsafe fn get_unchecked_mut(self, slice: &mut [T]) -> &mut [T]

fn index(self, slice: &[T]) -> &[T]

fn index_mut(self, slice: &mut [T]) -> &mut [T]

impl<Idx> Hash for RangeTo<Idx> where Idx: Hash [src]

fn hash<__HIdx>(&self, __arg_0: &mut __HIdx) where __HIdx: Hasher

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

1.3.0