pub struct RangeTo<Idx> {
pub end: Idx,
}
A range only bounded exclusively above (..end).
The RangeTo ..end contains all values with x < end. It cannot serve as an Iterator because it doesn't have a starting point.
The ..end 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:
// error[E0277]: the trait bound `std::ops::RangeTo<{integer}>:
// std::iter::Iterator` is not satisfied
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, 4]; assert_eq!(arr[ .. ], [0,1,2,3,4]); assert_eq!(arr[ .. 3], [0,1,2 ]); // RangeTo assert_eq!(arr[ ..=3], [0,1,2,3 ]); assert_eq!(arr[1.. ], [ 1,2,3,4]); assert_eq!(arr[1.. 3], [ 1,2 ]); assert_eq!(arr[1..=3], [ 1,2,3 ]);
end: IdxThe upper bound of the range (exclusive).
impl<Idx> RangeTo<Idx> where
Idx: PartialOrd<Idx>, [src]
pub fn contains<U>(&self, item: &U) -> bool where
Idx: PartialOrd<U>,
U: PartialOrd<Idx> + ?Sized, [src]1.35.0
Returns true if item is contained in the range.
use std::f32; assert!( (..5).contains(&-1_000_000_000)); assert!( (..5).contains(&4)); assert!(!(..5).contains(&5)); assert!( (..1.0).contains(&0.5)); assert!(!(..1.0).contains(&f32::NAN)); assert!(!(..f32::NAN).contains(&0.5));
impl<Idx> Copy for RangeTo<Idx> where
Idx: Copy, [src]
impl<Idx> Hash for RangeTo<Idx> where
Idx: Hash, [src]
fn hash<__HIdx>(&self, state: &mut __HIdx) where
__HIdx: Hasher, [src]
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher, [src]1.3.0
Feeds a slice of this type into the given [Hasher]. Read more
impl<Idx> Clone for RangeTo<Idx> where
Idx: Clone, [src]
fn clone(&self) -> RangeTo<Idx>[src]
fn clone_from(&mut self, source: &Self)[src]
Performs copy-assignment from source. Read more
impl<Idx> Eq for RangeTo<Idx> where
Idx: Eq, [src]
impl<Idx> Debug for RangeTo<Idx> where
Idx: Debug, [src]
impl<Idx> PartialEq<RangeTo<Idx>> for RangeTo<Idx> where
Idx: PartialEq<Idx>, [src]
impl SliceIndex<str> for RangeTo<usize>[src]1.20.0
Implements substring slicing with syntax &self[.. end] or &mut self[.. end].
Returns a slice of the given string from the byte range [0, end). Equivalent to &self[0 .. end] or &mut self[0 .. 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 end does not point to the starting byte offset of a character (as defined by is_char_boundary), or if end > len.
type Output = strThe output type returned by methods.
fn get(
self,
slice: &str
) -> Option<&<RangeTo<usize> as SliceIndex<str>>::Output>[src]
fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeTo<usize> as SliceIndex<str>>::Output>[src]
unsafe fn get_unchecked(
self,
slice: &str
) -> &<RangeTo<usize> as SliceIndex<str>>::Output[src]
unsafe fn get_unchecked_mut(
self,
slice: &mut str
) -> &mut <RangeTo<usize> as SliceIndex<str>>::Output[src]
fn index(self, slice: &str) -> &<RangeTo<usize> as SliceIndex<str>>::Output[src]
fn index_mut(
self,
slice: &mut str
) -> &mut <RangeTo<usize> as SliceIndex<str>>::Output[src]
impl<T> SliceIndex<[T]> for RangeTo<usize>[src]1.15.0
type Output = [T]The output type returned by methods.
fn get(self, slice: &[T]) -> Option<&[T]>[src]
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>[src]
unsafe fn get_unchecked(self, slice: &[T]) -> &[T][src]
unsafe fn get_unchecked_mut(self, slice: &mut [T]) -> &mut [T][src]
fn index(self, slice: &[T]) -> &[T][src]
fn index_mut(self, slice: &mut [T]) -> &mut [T][src]
impl<'_, T> RangeBounds<T> for RangeTo<&'_ T>[src]1.28.0
fn start_bound(&self) -> Bound<&T>[src]
fn end_bound(&self) -> Bound<&T>[src]
fn contains<U>(&self, item: &U) -> bool where
T: PartialOrd<U>,
U: PartialOrd<T> + ?Sized, [src]1.35.0
Returns true if item is contained in the range. Read more
impl<T> RangeBounds<T> for RangeTo<T>[src]1.28.0
fn start_bound(&self) -> Bound<&T>[src]
fn end_bound(&self) -> Bound<&T>[src]
fn contains<U>(&self, item: &U) -> bool where
T: PartialOrd<U>,
U: PartialOrd<T> + ?Sized, [src]1.35.0
Returns true if item is contained in the range. Read more
impl Index<RangeTo<usize>> for String[src]
type Output = strThe returned type after indexing.
fn index(&self, index: RangeTo<usize>) -> &str[src]
impl IndexMut<RangeTo<usize>> for String[src]1.3.0
impl<Idx> UnwindSafe for RangeTo<Idx> where
Idx: UnwindSafe, impl<Idx> RefUnwindSafe for RangeTo<Idx> where
Idx: RefUnwindSafe, impl<Idx> Unpin for RangeTo<Idx> where
Idx: Unpin, impl<Idx> Send for RangeTo<Idx> where
Idx: Send, impl<Idx> Sync for RangeTo<Idx> where
Idx: Sync, impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
type Error = InfallibleThe type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T, U> Into<U> for T where
U: From<T>, [src]
impl<T> From<T> for T[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
type Error = <U as TryFrom<T>>::ErrorThe type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]
impl<T> Borrow<T> for T where
T: ?Sized, [src]
fn borrow(&self) -> &T[src]
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized,
type Item = <I as Iterator>::Item;
impl<'_, R: Read + ?Sized> Read for &'_ mut R
impl<'_, W: Write + ?Sized> Write for &'_ mut W
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
fn borrow_mut(&mut self) -> &mut T[src]
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized,
type Item = <I as Iterator>::Item;
impl<'_, R: Read + ?Sized> Read for &'_ mut R
impl<'_, W: Write + ?Sized> Write for &'_ mut W
impl<T> Any for T where
T: 'static + ?Sized, [src]
impl<T> ToOwned for T where
T: Clone, [src]
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/ops/struct.RangeTo.html