pub struct RangeFrom<Idx> {
pub start: Idx,
}Expand description
A range only bounded inclusively below (start..).
The RangeFrom start.. contains all values with x >= start.
Note: Overflow in the Iterator implementation (when the contained
data type reaches its numerical limit) is allowed to panic, wrap, or
saturate. This behavior is defined by the implementation of the Step
trait. For primitive integers, this follows the normal rules, and respects
the overflow checks profile (panic in debug, wrap in release). Note also
that overflow happens earlier than you might assume: the overflow happens
in the call to next that yields the maximum value, as the range must be
set to a state to yield the next value.
Examples
The start.. syntax is a RangeFrom:
assert_eq!((2..), std::ops::RangeFrom { start: 2 });
assert_eq!(2 + 3 + 4, (2..).take(3).sum());Runlet 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]); // This is a `RangeFrom`
assert_eq!(arr[1.. 3], [ 1, 2 ]);
assert_eq!(arr[1..=3], [ 1, 2, 3 ]);RunFields§
§start: IdxThe lower bound of the range (inclusive).
Implementations§
source§impl<Idx: PartialOrd<Idx>> RangeFrom<Idx>
impl<Idx: PartialOrd<Idx>> RangeFrom<Idx>
1.35.0 · sourcepub fn contains<U>(&self, item: &U) -> boolwhere
Idx: PartialOrd<U>,
U: ?Sized + PartialOrd<Idx>,
pub fn contains<U>(&self, item: &U) -> boolwhere
Idx: PartialOrd<U>,
U: ?Sized + PartialOrd<Idx>,
Trait Implementations§
source§impl<A: Step> Iterator for RangeFrom<A>
impl<A: Step> Iterator for RangeFrom<A>
source§fn size_hint(&self) -> (usize, Option<usize>)
fn size_hint(&self) -> (usize, Option<usize>)
source§fn next_chunk<const N: usize>(
&mut self
) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where
Self: Sized,
fn next_chunk<const N: usize>(
&mut self
) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where
Self: Sized,
iter_next_chunk #98326)N values. Read moresource§fn count(self) -> usizewhere
Self: Sized,
fn count(self) -> usizewhere
Self: Sized,
source§fn last(self) -> Option<Self::Item>where
Self: Sized,
fn last(self) -> Option<Self::Item>where
Self: Sized,
source§fn advance_by(&mut self, n: usize) -> Result<(), usize>
fn advance_by(&mut self, n: usize) -> Result<(), usize>
iter_advance_by #77404)n elements. Read more1.28.0 · source§fn step_by(self, step: usize) -> StepBy<Self> ⓘwhere
Self: Sized,
fn step_by(self, step: usize) -> StepBy<Self> ⓘwhere
Self: Sized,
source§fn chain<U>(self, other: U) -> Chain<Self, U::IntoIter> ⓘwhere
Self: Sized,
U: IntoIterator<Item = Self::Item>,
fn chain<U>(self, other: U) -> Chain<Self, U::IntoIter> ⓘwhere
Self: Sized,
U: IntoIterator<Item = Self::Item>,
source§fn zip<U>(self, other: U) -> Zip<Self, U::IntoIter> ⓘwhere
Self: Sized,
U: IntoIterator,
fn zip<U>(self, other: U) -> Zip<Self, U::IntoIter> ⓘwhere
Self: Sized,
U: IntoIterator,
source§fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G> ⓘwhere
Self: Sized,
G: FnMut() -> Self::Item,
fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G> ⓘwhere
Self: Sized,
G: FnMut() -> Self::Item,
iter_intersperse #79524)separator
between adjacent items of the original iterator. Read moresource§fn map<B, F>(self, f: F) -> Map<Self, F> ⓘwhere
Self: Sized,
F: FnMut(Self::Item) -> B,
fn map<B, F>(self, f: F) -> Map<Self, F> ⓘwhere
Self: Sized,
F: FnMut(Self::Item) -> B,
1.21.0 · source§fn for_each<F>(self, f: F)where
Self: Sized,
F: FnMut(Self::Item),
fn for_each<F>(self, f: F)where
Self: Sized,
F: FnMut(Self::Item),
source§fn filter<P>(self, predicate: P) -> Filter<Self, P> ⓘwhere
Self: Sized,
P: FnMut(&Self::Item) -> bool,
fn filter<P>(self, predicate: P) -> Filter<Self, P> ⓘwhere
Self: Sized,
P: FnMut(&Self::Item) -> bool,
source§fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> ⓘwhere
Self: Sized,
F: FnMut(Self::Item) -> Option<B>,
fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> ⓘwhere
Self: Sized,
F: FnMut(Self::Item) -> Option<B>,
source§fn enumerate(self) -> Enumerate<Self> ⓘwhere
Self: Sized,
fn enumerate(self) -> Enumerate<Self> ⓘwhere
Self: Sized,
source§fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> ⓘwhere
Self: Sized,
P: FnMut(&Self::Item) -> bool,
fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> ⓘwhere
Self: Sized,
P: FnMut(&Self::Item) -> bool,
source§fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> ⓘwhere
Self: Sized,
P: FnMut(&Self::Item) -> bool,
fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> ⓘwhere
Self: Sized,
P: FnMut(&Self::Item) -> bool,
1.57.0 · source§fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P> ⓘwhere
Self: Sized,
P: FnMut(Self::Item) -> Option<B>,
fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P> ⓘwhere
Self: Sized,
P: FnMut(Self::Item) -> Option<B>,
source§fn skip(self, n: usize) -> Skip<Self> ⓘwhere
Self: Sized,
fn skip(self, n: usize) -> Skip<Self> ⓘwhere
Self: Sized,
n elements. Read moresource§fn take(self, n: usize) -> Take<Self> ⓘwhere
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fn take(self, n: usize) -> Take<Self> ⓘwhere
Self: Sized,
n elements, or fewer
if the underlying iterator ends sooner. Read moresource§fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> ⓘwhere
Self: Sized,
F: FnMut(&mut St, Self::Item) -> Option<B>,
fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> ⓘwhere
Self: Sized,
F: FnMut(&mut St, Self::Item) -> Option<B>,
source§fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> ⓘwhere
Self: Sized,
U: IntoIterator,
F: FnMut(Self::Item) -> U,
fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> ⓘwhere
Self: Sized,
U: IntoIterator,
F: FnMut(Self::Item) -> U,
source§fn inspect<F>(self, f: F) -> Inspect<Self, F> ⓘwhere
Self: Sized,
F: FnMut(&Self::Item),
fn inspect<F>(self, f: F) -> Inspect<Self, F> ⓘwhere
Self: Sized,
F: FnMut(&Self::Item),
source§fn by_ref(&mut self) -> &mut Selfwhere
Self: Sized,
fn by_ref(&mut self) -> &mut Selfwhere
Self: Sized,
source§fn collect<B: FromIterator<Self::Item>>(self) -> Bwhere
Self: Sized,
fn collect<B: FromIterator<Self::Item>>(self) -> Bwhere
Self: Sized,
source§fn collect_into<E: Extend<Self::Item>>(self, collection: &mut E) -> &mut Ewhere
Self: Sized,
fn collect_into<E: Extend<Self::Item>>(self, collection: &mut E) -> &mut Ewhere
Self: Sized,
iter_collect_into #94780)source§fn partition<B, F>(self, f: F) -> (B, B)where
Self: Sized,
B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
fn partition<B, F>(self, f: F) -> (B, B)where
Self: Sized,
B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
source§fn is_partitioned<P>(self, predicate: P) -> boolwhere
Self: Sized,
P: FnMut(Self::Item) -> bool,
fn is_partitioned<P>(self, predicate: P) -> boolwhere
Self: Sized,
P: FnMut(Self::Item) -> bool,
iter_is_partitioned #62544)true precede all those that return false. Read more1.27.0 · source§fn try_fold<B, F, R>(&mut self, init: B, f: F) -> Rwhere
Self: Sized,
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
fn try_fold<B, F, R>(&mut self, init: B, f: F) -> Rwhere
Self: Sized,
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
1.27.0 · source§fn try_for_each<F, R>(&mut self, f: F) -> Rwhere
Self: Sized,
F: FnMut(Self::Item) -> R,
R: Try<Output = ()>,
fn try_for_each<F, R>(&mut self, f: F) -> Rwhere
Self: Sized,
F: FnMut(Self::Item) -> R,
R: Try<Output = ()>,
source§fn fold<B, F>(self, init: B, f: F) -> Bwhere
Self: Sized,
F: FnMut(B, Self::Item) -> B,
fn fold<B, F>(self, init: B, f: F) -> Bwhere
Self: Sized,
F: FnMut(B, Self::Item) -> B,
1.51.0 · source§fn reduce<F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> Self::Item,
fn reduce<F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> Self::Item,
source§fn try_reduce<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<R::Output>>>::TryTypewhere
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> R,
R: Try<Output = Self::Item>,
R::Residual: Residual<Option<Self::Item>>,
fn try_reduce<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<R::Output>>>::TryTypewhere
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> R,
R: Try<Output = Self::Item>,
R::Residual: Residual<Option<Self::Item>>,
iterator_try_reduce #87053)source§fn all<F>(&mut self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> bool,
fn all<F>(&mut self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> bool,
source§fn any<F>(&mut self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> bool,
fn any<F>(&mut self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> bool,
source§fn find<P>(&mut self, predicate: P) -> Option<Self::Item>where
Self: Sized,
P: FnMut(&Self::Item) -> bool,
fn find<P>(&mut self, predicate: P) -> Option<Self::Item>where
Self: Sized,
P: FnMut(&Self::Item) -> bool,
1.30.0 · source§fn find_map<B, F>(&mut self, f: F) -> Option<B>where
Self: Sized,
F: FnMut(Self::Item) -> Option<B>,
fn find_map<B, F>(&mut self, f: F) -> Option<B>where
Self: Sized,
F: FnMut(Self::Item) -> Option<B>,
source§fn try_find<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryTypewhere
Self: Sized,
F: FnMut(&Self::Item) -> R,
R: Try<Output = bool>,
R::Residual: Residual<Option<Self::Item>>,
fn try_find<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryTypewhere
Self: Sized,
F: FnMut(&Self::Item) -> R,
R: Try<Output = bool>,
R::Residual: Residual<Option<Self::Item>>,
try_find #63178)source§fn position<P>(&mut self, predicate: P) -> Option<usize>where
Self: Sized,
P: FnMut(Self::Item) -> bool,
fn position<P>(&mut self, predicate: P) -> Option<usize>where
Self: Sized,
P: FnMut(Self::Item) -> bool,
1.6.0 · source§fn max_by_key<B: Ord, F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item) -> B,
fn max_by_key<B: Ord, F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item) -> B,
1.15.0 · source§fn max_by<F>(self, compare: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
fn max_by<F>(self, compare: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
1.6.0 · source§fn min_by_key<B: Ord, F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item) -> B,
fn min_by_key<B: Ord, F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item) -> B,
1.15.0 · source§fn min_by<F>(self, compare: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
fn min_by<F>(self, compare: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
source§fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Sized + Iterator<Item = (A, B)>,
fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Sized + Iterator<Item = (A, B)>,
1.36.0 · source§fn copied<'a, T>(self) -> Copied<Self> ⓘwhere
Self: Sized + Iterator<Item = &'a T>,
T: Copy + 'a,
fn copied<'a, T>(self) -> Copied<Self> ⓘwhere
Self: Sized + Iterator<Item = &'a T>,
T: Copy + 'a,
source§fn cloned<'a, T>(self) -> Cloned<Self> ⓘwhere
Self: Sized + Iterator<Item = &'a T>,
T: Clone + 'a,
fn cloned<'a, T>(self) -> Cloned<Self> ⓘwhere
Self: Sized + Iterator<Item = &'a T>,
T: Clone + 'a,
source§fn cycle(self) -> Cycle<Self> ⓘwhere
Self: Sized + Clone,
fn cycle(self) -> Cycle<Self> ⓘwhere
Self: Sized + Clone,
source§fn array_chunks<const N: usize>(self) -> ArrayChunks<Self, N> ⓘwhere
Self: Sized,
fn array_chunks<const N: usize>(self) -> ArrayChunks<Self, N> ⓘwhere
Self: Sized,
iter_array_chunks #100450)N elements of the iterator at a time. Read more1.11.0 · source§fn sum<S>(self) -> Swhere
Self: Sized,
S: Sum<Self::Item>,
fn sum<S>(self) -> Swhere
Self: Sized,
S: Sum<Self::Item>,
1.11.0 · source§fn product<P>(self) -> Pwhere
Self: Sized,
P: Product<Self::Item>,
fn product<P>(self) -> Pwhere
Self: Sized,
P: Product<Self::Item>,
source§fn cmp_by<I, F>(self, other: I, cmp: F) -> Orderingwhere
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, I::Item) -> Ordering,
fn cmp_by<I, F>(self, other: I, cmp: F) -> Orderingwhere
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, I::Item) -> Ordering,
iter_order_by #64295)Iterator with those
of another with respect to the specified comparison function. Read more1.5.0 · source§fn partial_cmp<I>(self, other: I) -> Option<Ordering>where
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
fn partial_cmp<I>(self, other: I) -> Option<Ordering>where
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
source§fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, I::Item) -> Option<Ordering>,
fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, I::Item) -> Option<Ordering>,
iter_order_by #64295)Iterator with those
of another with respect to the specified comparison function. Read more1.5.0 · source§fn eq<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialEq<I::Item>,
Self: Sized,
fn eq<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialEq<I::Item>,
Self: Sized,
source§fn eq_by<I, F>(self, other: I, eq: F) -> boolwhere
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, I::Item) -> bool,
fn eq_by<I, F>(self, other: I, eq: F) -> boolwhere
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, I::Item) -> bool,
iter_order_by #64295)1.5.0 · source§fn ne<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialEq<I::Item>,
Self: Sized,
fn ne<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialEq<I::Item>,
Self: Sized,
1.5.0 · source§fn lt<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
fn lt<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
Iterator are lexicographically
less than those of another. Read more1.5.0 · source§fn le<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
fn le<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
Iterator are lexicographically
less or equal to those of another. Read more1.5.0 · source§fn gt<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
fn gt<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
Iterator are lexicographically
greater than those of another. Read more1.5.0 · source§fn ge<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
fn ge<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
Iterator are lexicographically
greater than or equal to those of another. Read moresource§fn is_sorted_by<F>(self, compare: F) -> boolwhere
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,
fn is_sorted_by<F>(self, compare: F) -> boolwhere
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,
is_sorted #53485)source§fn is_sorted_by_key<F, K>(self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> K,
K: PartialOrd,
fn is_sorted_by_key<F, K>(self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> K,
K: PartialOrd,
is_sorted #53485)source§impl<Idx: PartialEq> PartialEq<RangeFrom<Idx>> for RangeFrom<Idx>
impl<Idx: PartialEq> PartialEq<RangeFrom<Idx>> for RangeFrom<Idx>
1.28.0 · source§impl<T> RangeBounds<T> for RangeFrom<&T>
impl<T> RangeBounds<T> for RangeFrom<&T>
1.28.0 · source§impl<T> RangeBounds<T> for RangeFrom<T>
impl<T> RangeBounds<T> for RangeFrom<T>
1.15.0 (const: unstable) · source§impl<T> SliceIndex<[T]> for RangeFrom<usize>
impl<T> SliceIndex<[T]> for RangeFrom<usize>
const: unstable · source§fn get(self, slice: &[T]) -> Option<&[T]>
fn get(self, slice: &[T]) -> Option<&[T]>
slice_index_methods)const: unstable · source§fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
slice_index_methods)const: unstable · source§unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
slice_index_methods)slice pointer
is undefined behavior even if the resulting reference is not used. Read moreconst: unstable · 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)slice pointer
is undefined behavior even if the resulting reference is not used. Read more1.20.0 (const: unstable) · source§impl SliceIndex<str> for RangeFrom<usize>
impl SliceIndex<str> for RangeFrom<usize>
Implements substring slicing with syntax &self[begin ..] or &mut self[begin ..].
Returns a slice of the given string from the byte range [begin, len).
Equivalent to &self[begin .. len] or &mut self[begin .. len].
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 begin does not point to the starting byte offset of
a character (as defined by is_char_boundary), or if begin > len.
const: unstable · source§fn get(self, slice: &str) -> Option<&Self::Output>
fn get(self, slice: &str) -> Option<&Self::Output>
slice_index_methods)const: unstable · source§fn get_mut(self, slice: &mut str) -> Option<&mut Self::Output>
fn get_mut(self, slice: &mut str) -> Option<&mut Self::Output>
slice_index_methods)const: unstable · source§unsafe fn get_unchecked(self, slice: *const str) -> *const Self::Output
unsafe fn get_unchecked(self, slice: *const str) -> *const Self::Output
slice_index_methods)slice pointer
is undefined behavior even if the resulting reference is not used. Read moreconst: unstable · source§unsafe fn get_unchecked_mut(self, slice: *mut str) -> *mut Self::Output
unsafe fn get_unchecked_mut(self, slice: *mut str) -> *mut Self::Output
slice_index_methods)slice pointer
is undefined behavior even if the resulting reference is not used. Read more