pub struct RangeFrom<Idx> {
pub start: Idx,
}
A range only bounded inclusively below (start..).
The RangeFrom start.. contains all values with x >= start.
Note: Currently, no overflow checking is done for the Iterator implementation; if you use an integer range and the integer overflows, it might panic in debug mode or create an endless loop in release mode. This overflow behavior might change in the future.
assert_eq!((2..), std::ops::RangeFrom { start: 2 });
assert_eq!(2 + 3 + 4, (2..).take(3).sum());
let arr = [0, 1, 2, 3];
assert_eq!(arr[ .. ], [0,1,2,3]);
assert_eq!(arr[ ..3], [0,1,2 ]);
assert_eq!(arr[1.. ], [ 1,2,3]); // RangeFrom
assert_eq!(arr[1..3], [ 1,2 ]); start: Idx The lower bound of the range (inclusive).
impl<Idx> RangeFrom<Idx> where
Idx: PartialOrd<Idx>,
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fn contains(&self, item: Idx) -> bool
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Returns true if item is contained in the range.
#![feature(range_contains)] assert!(!(3..).contains(2)); assert!( (3..).contains(3)); assert!( (3..).contains(1_000_000_000));
impl Index<RangeFrom<usize>> for String
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type Output = strThe returned type after indexing.
fn index(&self, index: RangeFrom<usize>) -> &str
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Performs the indexing (container[index]) operation.
impl<T> Index<RangeFrom<usize>> for Vec<T>
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type Output = [T]The returned type after indexing.
fn index(&self, index: RangeFrom<usize>) -> &[T]
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Performs the indexing (container[index]) operation.
impl<T> RangeArgument<T> for RangeFrom<T>
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fn start(&self) -> Bound<&T>
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Start index bound. Read more
fn end(&self) -> Bound<&T>
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End index bound. Read more
impl IndexMut<RangeFrom<usize>> for String
fn index_mut(&mut self, index: RangeFrom<usize>) -> &mut str
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Performs the mutable indexing (container[index]) operation.
impl<T> IndexMut<RangeFrom<usize>> for Vec<T>
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fn index_mut(&mut self, index: RangeFrom<usize>) -> &mut [T]
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Performs the mutable indexing (container[index]) operation.
impl<Idx> Clone for RangeFrom<Idx> where
Idx: Clone,
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fn clone(&self) -> RangeFrom<Idx>
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source. Read more
impl<Idx> Eq for RangeFrom<Idx> where
Idx: Eq,
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impl<Idx> Hash for RangeFrom<Idx> where
Idx: Hash,
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fn hash<__HIdx>(&self, __arg_0: &mut __HIdx) where
__HIdx: Hasher,
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Feeds this value into the given [Hasher]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
Feeds a slice of this type into the given [Hasher]. Read more
impl IndexMut<RangeFrom<usize>> for str
Implements mutable substring slicing with syntax &mut self[begin ..].
Returns a mutable slice of the string from byte offset begin to the end of the string.
Equivalent to &mut self[begin .. len].
fn index_mut(&mut self, index: RangeFrom<usize>) -> &mut str
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Performs the mutable indexing (container[index]) operation.
impl<A> FusedIterator for RangeFrom<A> where
A: Step,
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impl<Idx> PartialEq<RangeFrom<Idx>> for RangeFrom<Idx> where
Idx: PartialEq<Idx>,
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fn eq(&self, __arg_0: &RangeFrom<Idx>) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, __arg_0: &RangeFrom<Idx>) -> bool
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This method tests for !=.
impl<A> Iterator for RangeFrom<A> where
A: Step,
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type Item = AThe type of the elements being iterated over.
fn next(&mut self) -> Option<A>
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Advances the iterator and returns the next value. Read more
fn size_hint(&self) -> (usize, Option<usize>)
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Returns the bounds on the remaining length of the iterator. Read more
fn nth(&mut self, n: usize) -> Option<A>
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Returns the nth element of the iterator. Read more
fn count(self) -> usize
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Consumes the iterator, counting the number of iterations and returning it. Read more
fn last(self) -> Option<Self::Item>
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Consumes the iterator, returning the last element. Read more
fn step_by(self, step: usize) -> StepBy<Self>
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Creates an iterator starting at the same point, but stepping by the given amount at each iteration. Read more
fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter> where
U: IntoIterator<Item = Self::Item>,
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Takes two iterators and creates a new iterator over both in sequence. Read more
fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter> where
U: IntoIterator,
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'Zips up' two iterators into a single iterator of pairs. Read more
fn map<B, F>(self, f: F) -> Map<Self, F> where
F: FnMut(Self::Item) -> B,
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Takes a closure and creates an iterator which calls that closure on each element. Read more
fn for_each<F>(self, f: F) where
F: FnMut(Self::Item) -> (),
Calls a closure on each element of an iterator. Read more
fn filter<P>(self, predicate: P) -> Filter<Self, P> where
P: FnMut(&Self::Item) -> bool,
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Creates an iterator which uses a closure to determine if an element should be yielded. Read more
fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> where
F: FnMut(Self::Item) -> Option<B>,
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Creates an iterator that both filters and maps. Read more
fn enumerate(self) -> Enumerate<Self>
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Creates an iterator which gives the current iteration count as well as the next value. Read more
fn peekable(self) -> Peekable<Self>
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Creates an iterator which can use peek to look at the next element of the iterator without consuming it. Read more
fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> where
P: FnMut(&Self::Item) -> bool,
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Creates an iterator that [skip]s elements based on a predicate. Read more
fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> where
P: FnMut(&Self::Item) -> bool,
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Creates an iterator that yields elements based on a predicate. Read more
fn skip(self, n: usize) -> Skip<Self>
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Creates an iterator that skips the first n elements. Read more
fn take(self, n: usize) -> Take<Self>
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Creates an iterator that yields its first n elements. Read more
fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> where
F: FnMut(&mut St, Self::Item) -> Option<B>,
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An iterator adaptor similar to [fold] that holds internal state and produces a new iterator. Read more
fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> where
F: FnMut(Self::Item) -> U,
U: IntoIterator,
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Creates an iterator that works like map, but flattens nested structure. Read more
fn fuse(self) -> Fuse<Self>
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Creates an iterator which ends after the first [None]. Read more
fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnMut(&Self::Item) -> (),
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Do something with each element of an iterator, passing the value on. Read more
fn by_ref(&mut self) -> &mut Self
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Borrows an iterator, rather than consuming it. Read more
fn collect<B>(self) -> B where
B: FromIterator<Self::Item>,
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Transforms an iterator into a collection. Read more
fn partition<B, F>(self, f: F) -> (B, B) where
B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
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Consumes an iterator, creating two collections from it. Read more
fn try_fold<B, F, R>(&mut self, init: B, f: F) -> R where
F: FnMut(B, Self::Item) -> R,
R: Try<Ok = B>,
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An iterator method that applies a function as long as it returns successfully, producing a single, final value. Read more
fn fold<B, F>(self, init: B, f: F) -> B where
F: FnMut(B, Self::Item) -> B,
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An iterator method that applies a function, producing a single, final value. Read more
fn all<F>(&mut self, f: F) -> bool where
F: FnMut(Self::Item) -> bool,
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Tests if every element of the iterator matches a predicate. Read more
fn any<F>(&mut self, f: F) -> bool where
F: FnMut(Self::Item) -> bool,
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Tests if any element of the iterator matches a predicate. Read more
fn find<P>(&mut self, predicate: P) -> Option<Self::Item> where
P: FnMut(&Self::Item) -> bool,
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Searches for an element of an iterator that satisfies a predicate. Read more
fn position<P>(&mut self, predicate: P) -> Option<usize> where
P: FnMut(Self::Item) -> bool,
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Searches for an element in an iterator, returning its index. Read more
fn rposition<P>(&mut self, predicate: P) -> Option<usize> where
P: FnMut(Self::Item) -> bool,
Self: ExactSizeIterator + DoubleEndedIterator,
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Searches for an element in an iterator from the right, returning its index. Read more
fn max(self) -> Option<Self::Item> where
Self::Item: Ord,
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Returns the maximum element of an iterator. Read more
fn min(self) -> Option<Self::Item> where
Self::Item: Ord,
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Returns the minimum element of an iterator. Read more
fn max_by_key<B, F>(self, f: F) -> Option<Self::Item> where
B: Ord,
F: FnMut(&Self::Item) -> B,
Returns the element that gives the maximum value from the specified function. Read more
fn max_by<F>(self, compare: F) -> Option<Self::Item> where
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
Returns the element that gives the maximum value with respect to the specified comparison function. Read more
fn min_by_key<B, F>(self, f: F) -> Option<Self::Item> where
B: Ord,
F: FnMut(&Self::Item) -> B,
Returns the element that gives the minimum value from the specified function. Read more
fn min_by<F>(self, compare: F) -> Option<Self::Item> where
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
Returns the element that gives the minimum value with respect to the specified comparison function. Read more
fn rev(self) -> Rev<Self> where
Self: DoubleEndedIterator,
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Reverses an iterator's direction. Read more
fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB) where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Iterator<Item = (A, B)>,
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Converts an iterator of pairs into a pair of containers. Read more
fn cloned<'a, T>(self) -> Cloned<Self> where
Self: Iterator<Item = &'a T>,
T: 'a + Clone,
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Creates an iterator which [clone]s all of its elements. Read more
fn cycle(self) -> Cycle<Self> where
Self: Clone,
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Repeats an iterator endlessly. Read more
fn sum<S>(self) -> S where
S: Sum<Self::Item>,
Sums the elements of an iterator. Read more
fn product<P>(self) -> P where
P: Product<Self::Item>,
Iterates over the entire iterator, multiplying all the elements Read more
fn cmp<I>(self, other: I) -> Ordering where
I: IntoIterator<Item = Self::Item>,
Self::Item: Ord,
Lexicographically compares the elements of this Iterator with those of another. Read more
fn partial_cmp<I>(self, other: I) -> Option<Ordering> where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Lexicographically compares the elements of this Iterator with those of another. Read more
fn eq<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialEq<<I as IntoIterator>::Item>,
Determines if the elements of this Iterator are equal to those of another. Read more
fn ne<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialEq<<I as IntoIterator>::Item>,
Determines if the elements of this Iterator are unequal to those of another. Read more
fn lt<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Determines if the elements of this Iterator are lexicographically less than those of another. Read more
fn le<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Determines if the elements of this Iterator are lexicographically less or equal to those of another. Read more
fn gt<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Determines if the elements of this Iterator are lexicographically greater than those of another. Read more
fn ge<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Determines if the elements of this Iterator are lexicographically greater than or equal to those of another. Read more
impl Index<RangeFrom<usize>> for str
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Implements substring slicing with syntax &self[begin ..].
Returns a slice of the string from byte offset begin to the end of the string.
Equivalent to &self[begin .. len].
type Output = strThe returned type after indexing.
fn index(&self, index: RangeFrom<usize>) -> &str
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Performs the indexing (container[index]) operation.
impl SliceIndex<str> for RangeFrom<usize>
type Output = strThe output type returned by methods.
fn get(
self,
slice: &str
) -> Option<&<RangeFrom<usize> as SliceIndex<str>>::Output>
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Returns a shared reference to the output at this location, if in bounds. Read more
fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeFrom<usize> as SliceIndex<str>>::Output>
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Returns a mutable reference to the output at this location, if in bounds. Read more
unsafe fn get_unchecked(
self,
slice: &str
) -> &<RangeFrom<usize> as SliceIndex<str>>::Output
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Returns a shared reference to the output at this location, without performing any bounds checking. Read more
unsafe fn get_unchecked_mut(
self,
slice: &mut str
) -> &mut <RangeFrom<usize> as SliceIndex<str>>::Output
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Returns a mutable reference to the output at this location, without performing any bounds checking. Read more
fn index(self, slice: &str) -> &<RangeFrom<usize> as SliceIndex<str>>::Output
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Returns a shared reference to the output at this location, panicking if out of bounds. Read more
fn index_mut(
self,
slice: &mut str
) -> &mut <RangeFrom<usize> as SliceIndex<str>>::Output
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Returns a mutable reference to the output at this location, panicking if out of bounds. Read more
impl<T> SliceIndex<[T]> for RangeFrom<usize>
type Output = [T]The output type returned by methods.
fn get(self, slice: &[T]) -> Option<&[T]>
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Returns a shared reference to the output at this location, if in bounds. Read more
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
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Returns a mutable reference to the output at this location, if in bounds. Read more
unsafe fn get_unchecked(self, slice: &[T]) -> &[T]
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Returns a shared reference to the output at this location, without performing any bounds checking. Read more
unsafe fn get_unchecked_mut(self, slice: &mut [T]) -> &mut [T]
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Returns a mutable reference to the output at this location, without performing any bounds checking. Read more
fn index(self, slice: &[T]) -> &[T]
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Returns a shared reference to the output at this location, panicking if out of bounds. Read more
fn index_mut(self, slice: &mut [T]) -> &mut [T]
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Returns a mutable reference to the output at this location, panicking if out of bounds. Read more
impl<Idx> Debug for RangeFrom<Idx> where
Idx: Debug,
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fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error>
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Formats the value using the given formatter. Read more
© 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.RangeFrom.html