1.0.0[−][src]Struct std::ops::RangeTo
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.
Examples
The ..end
syntax is a RangeTo
:
assert_eq!((..5), std::ops::RangeTo { end: 5 });Run
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 { // ... }Run
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 ]);Run
Fields
end: Idx
The upper bound of the range (exclusive).
Methods
impl<Idx> RangeTo<Idx> where
Idx: PartialOrd<Idx>,
[src]
Idx: PartialOrd<Idx>,
pub fn contains<U>(&self, item: &U) -> bool where
Idx: PartialOrd<U>,
U: PartialOrd<Idx> + ?Sized,
1.35.0[src]
Idx: PartialOrd<U>,
U: PartialOrd<Idx> + ?Sized,
Trait Implementations
impl<Idx> Debug for RangeTo<Idx> where
Idx: Debug,
[src]
Idx: Debug,
impl SliceIndex<str> for RangeTo<usize>
1.20.0[src]
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
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 = str
The output type returned by methods.
fn get(
self,
slice: &str
) -> Option<&<RangeTo<usize> as SliceIndex<str>>::Output>
[src]
self,
slice: &str
) -> Option<&<RangeTo<usize> as SliceIndex<str>>::Output>
fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeTo<usize> as SliceIndex<str>>::Output>
[src]
self,
slice: &mut str
) -> Option<&mut <RangeTo<usize> as SliceIndex<str>>::Output>
unsafe fn get_unchecked(
self,
slice: &str
) -> &<RangeTo<usize> as SliceIndex<str>>::Output
[src]
self,
slice: &str
) -> &<RangeTo<usize> as SliceIndex<str>>::Output
unsafe fn get_unchecked_mut(
self,
slice: &mut str
) -> &mut <RangeTo<usize> as SliceIndex<str>>::Output
[src]
self,
slice: &mut str
) -> &mut <RangeTo<usize> as SliceIndex<str>>::Output
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]
self,
slice: &mut str
) -> &mut <RangeTo<usize> as SliceIndex<str>>::Output
impl<T> SliceIndex<[T]> for RangeTo<usize>
1.15.0[src]
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<Idx> Hash for RangeTo<Idx> where
Idx: Hash,
[src]
Idx: Hash,
fn hash<__H>(&self, state: &mut __H) where
__H: Hasher,
[src]
__H: Hasher,
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]
H: Hasher,
impl<Idx> Eq for RangeTo<Idx> where
Idx: Eq,
[src]
Idx: Eq,
impl<Idx> Clone for RangeTo<Idx> where
Idx: Clone,
[src]
Idx: Clone,
impl<Idx> PartialEq<RangeTo<Idx>> for RangeTo<Idx> where
Idx: PartialEq<Idx>,
[src]
Idx: PartialEq<Idx>,
impl<T> RangeBounds<T> for RangeTo<T>
1.28.0[src]
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,
1.35.0[src]
T: PartialOrd<U>,
U: PartialOrd<T> + ?Sized,
impl<'_, T> RangeBounds<T> for RangeTo<&'_ T>
1.28.0[src]
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,
1.35.0[src]
T: PartialOrd<U>,
U: PartialOrd<T> + ?Sized,
impl<Idx> Copy for RangeTo<Idx> where
Idx: Copy,
[src]
Idx: Copy,
impl IndexMut<RangeTo<usize>> for String
1.3.0[src]
impl Index<RangeTo<usize>> for String
[src]
Auto Trait Implementations
impl<Idx> UnwindSafe for RangeTo<Idx> where
Idx: UnwindSafe,
Idx: UnwindSafe,
impl<Idx> RefUnwindSafe for RangeTo<Idx> where
Idx: RefUnwindSafe,
Idx: RefUnwindSafe,
impl<Idx> Unpin for RangeTo<Idx> where
Idx: Unpin,
Idx: Unpin,
impl<Idx> Send for RangeTo<Idx> where
Idx: Send,
Idx: Send,
impl<Idx> Sync for RangeTo<Idx> where
Idx: Sync,
Idx: Sync,
Blanket Implementations
impl<T> From<T> for T
[src]
impl<T, U> TryFrom<U> for T where
U: Into<T>,
[src]
U: Into<T>,
type Error = Infallible
The 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]
U: From<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
[src]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The 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]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]
T: ?Sized,
ⓘImportant traits for &'_ mut Ffn borrow_mut(&mut self) -> &mut T
[src]
impl<T> Any for T where
T: 'static + ?Sized,
[src]
T: 'static + ?Sized,
impl<T> ToOwned for T where
T: Clone,
[src]
T: Clone,