pub struct RangeTo<Idx> {
pub end: Idx,
}mtls only.Expand description
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 });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 ]); // This is a `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 ]);Fields§
§end: IdxThe upper bound of the range (exclusive).
Implementations§
Source§impl<Idx> RangeTo<Idx>where
Idx: PartialOrd,
impl<Idx> RangeTo<Idx>where
Idx: PartialOrd,
1.35.0 · Sourcepub fn contains<U>(&self, item: &U) -> bool
pub fn contains<U>(&self, item: &U) -> bool
Returns true if item is contained in the range.
§Examples
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));Trait Implementations§
Source§impl<C1, C2> ContainsToken<C1> for RangeTo<C2>
impl<C1, C2> ContainsToken<C1> for RangeTo<C2>
Source§fn contains_token(&self, token: C1) -> bool
fn contains_token(&self, token: C1) -> bool
Source§impl<'de, Idx> Deserialize<'de> for RangeTo<Idx>where
Idx: Deserialize<'de>,
impl<'de, Idx> Deserialize<'de> for RangeTo<Idx>where
Idx: Deserialize<'de>,
Source§fn deserialize<D>(
deserializer: D,
) -> Result<RangeTo<Idx>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
fn deserialize<D>(
deserializer: D,
) -> Result<RangeTo<Idx>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
Source§impl<'v, T: Send> FromForm<'v> for RangeTo<T>where
RangeTo<T>: FromForm<'v>,
impl<'v, T: Send> FromForm<'v> for RangeTo<T>where
RangeTo<T>: FromForm<'v>,
Source§fn push_value(ctxt: &mut Self::Context, field: ValueField<'v>)
fn push_value(ctxt: &mut Self::Context, field: ValueField<'v>)
field.Source§fn push_data<'life0, 'life1, 'async_trait>(
ctxt: &'life0 mut Self::Context,
field: DataField<'v, 'life1>,
) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_trait>>where
Self: 'async_trait,
'v: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
fn push_data<'life0, 'life1, 'async_trait>(
ctxt: &'life0 mut Self::Context,
field: DataField<'v, 'life1>,
) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_trait>>where
Self: 'async_trait,
'v: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
field.Source§fn finalize(this: Self::Context) -> Result<'v, Self>
fn finalize(this: Self::Context) -> Result<'v, Self>
Errors otherwise.Source§impl<T> IntoBounds<T> for RangeTo<T>
impl<T> IntoBounds<T> for RangeTo<T>
Source§impl<T> OneSidedRange<T> for RangeTo<T>where
RangeTo<T>: RangeBounds<T>,
impl<T> OneSidedRange<T> for RangeTo<T>where
RangeTo<T>: RangeBounds<T>,
Source§fn bound(self) -> (OneSidedRangeBound, T)
fn bound(self) -> (OneSidedRangeBound, T)
one_sided_range)split_off and
split_off_mut that returns the bound of the one-sided range.1.28.0 · Source§impl<T> RangeBounds<T> for RangeTo<&T>
If you need to use this implementation where T is unsized,
consider using the RangeBounds impl for a 2-tuple of Bound<&T>,
i.e. replace ..end with (Bound::Unbounded, Bound::Excluded(end)).
impl<T> RangeBounds<T> for RangeTo<&T>
If you need to use this implementation where T is unsized,
consider using the RangeBounds impl for a 2-tuple of Bound<&T>,
i.e. replace ..end with (Bound::Unbounded, Bound::Excluded(end)).
1.28.0 · Source§impl<T> RangeBounds<T> for RangeTo<T>
impl<T> RangeBounds<T> for RangeTo<T>
Source§impl<Idx> Serialize for RangeTo<Idx>where
Idx: Serialize,
impl<Idx> Serialize for RangeTo<Idx>where
Idx: Serialize,
Source§fn serialize<S>(
&self,
serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
S: Serializer,
fn serialize<S>(
&self,
serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
S: Serializer,
1.15.0 (const: unstable) · Source§impl<T> SliceIndex<[T]> for RangeTo<usize>
The methods index and index_mut panic if the end of the range is out of bounds.
impl<T> SliceIndex<[T]> for RangeTo<usize>
The methods index and index_mut panic if the end of the range is out of bounds.
Source§fn get(self, slice: &[T]) -> Option<&[T]>
fn get(self, slice: &[T]) -> Option<&[T]>
slice_index_methods)Source§fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
slice_index_methods)Source§unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
slice_index_methods)Source§unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
slice_index_methods)Source§impl SliceIndex<ByteStr> for RangeTo<usize>
impl SliceIndex<ByteStr> for RangeTo<usize>
Source§fn get(
self,
slice: &ByteStr,
) -> Option<&<RangeTo<usize> as SliceIndex<ByteStr>>::Output>
fn get( self, slice: &ByteStr, ) -> Option<&<RangeTo<usize> as SliceIndex<ByteStr>>::Output>
slice_index_methods)Source§fn get_mut(
self,
slice: &mut ByteStr,
) -> Option<&mut <RangeTo<usize> as SliceIndex<ByteStr>>::Output>
fn get_mut( self, slice: &mut ByteStr, ) -> Option<&mut <RangeTo<usize> as SliceIndex<ByteStr>>::Output>
slice_index_methods)Source§unsafe fn get_unchecked(
self,
slice: *const ByteStr,
) -> *const <RangeTo<usize> as SliceIndex<ByteStr>>::Output
unsafe fn get_unchecked( self, slice: *const ByteStr, ) -> *const <RangeTo<usize> as SliceIndex<ByteStr>>::Output
slice_index_methods)Source§unsafe fn get_unchecked_mut(
self,
slice: *mut ByteStr,
) -> *mut <RangeTo<usize> as SliceIndex<ByteStr>>::Output
unsafe fn get_unchecked_mut( self, slice: *mut ByteStr, ) -> *mut <RangeTo<usize> as SliceIndex<ByteStr>>::Output
slice_index_methods)1.20.0 (const: unstable) · Source§impl SliceIndex<str> for RangeTo<usize>
Implements substring slicing with syntax &self[.. end] or &mut self[.. end].
impl SliceIndex<str> for RangeTo<usize>
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.
Source§fn get(
self,
slice: &str,
) -> Option<&<RangeTo<usize> as SliceIndex<str>>::Output>
fn get( self, slice: &str, ) -> Option<&<RangeTo<usize> as SliceIndex<str>>::Output>
slice_index_methods)Source§fn get_mut(
self,
slice: &mut str,
) -> Option<&mut <RangeTo<usize> as SliceIndex<str>>::Output>
fn get_mut( self, slice: &mut str, ) -> Option<&mut <RangeTo<usize> as SliceIndex<str>>::Output>
slice_index_methods)Source§unsafe fn get_unchecked(
self,
slice: *const str,
) -> *const <RangeTo<usize> as SliceIndex<str>>::Output
unsafe fn get_unchecked( self, slice: *const str, ) -> *const <RangeTo<usize> as SliceIndex<str>>::Output
slice_index_methods)Source§unsafe fn get_unchecked_mut(
self,
slice: *mut str,
) -> *mut <RangeTo<usize> as SliceIndex<str>>::Output
unsafe fn get_unchecked_mut( self, slice: *mut str, ) -> *mut <RangeTo<usize> as SliceIndex<str>>::Output
slice_index_methods)impl<Idx> Copy for RangeTo<Idx>where
Idx: Copy,
impl<Idx> Eq for RangeTo<Idx>where
Idx: Eq,
impl<Idx> StructuralPartialEq for RangeTo<Idx>
Auto Trait Implementations§
impl<Idx> Freeze for RangeTo<Idx>where
Idx: Freeze,
impl<Idx> RefUnwindSafe for RangeTo<Idx>where
Idx: RefUnwindSafe,
impl<Idx> Send for RangeTo<Idx>where
Idx: Send,
impl<Idx> Sync for RangeTo<Idx>where
Idx: Sync,
impl<Idx> Unpin for RangeTo<Idx>where
Idx: Unpin,
impl<Idx> UnwindSafe for RangeTo<Idx>where
Idx: UnwindSafe,
Blanket Implementations§
Source§impl<T> AsAny for Twhere
T: Any,
impl<T> AsAny for Twhere
T: Any,
fn as_any_ref(&self) -> &(dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Source§impl<'a, T, E> AsTaggedExplicit<'a, E> for Twhere
T: 'a,
impl<'a, T, E> AsTaggedExplicit<'a, E> for Twhere
T: 'a,
Source§impl<'a, T, E> AsTaggedImplicit<'a, E> for Twhere
T: 'a,
impl<'a, T, E> AsTaggedImplicit<'a, E> for Twhere
T: 'a,
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
Source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
Source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key and return true if they are equal.Source§impl<T> Instrument for T
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fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
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fn in_current_span(self) -> Instrumented<Self> ⓘ
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