pub struct Drain<'a, T: 'a> { /* fields omitted */ }
A draining iterator for Vec<T>
.
This struct
is created by the drain
method on Vec
.
impl<'a, T: Sync> Sync for Drain<'a, T>
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impl<'a, T: Send> Send for Drain<'a, T>
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impl<'a, T> Iterator for Drain<'a, T>
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type Item = T
The type of the elements being iterated over.
fn next(&mut self) -> Option<T>
Advances the iterator and returns the next value. Read more
fn size_hint(&self) -> (usize, Option<usize>)
Returns the bounds on the remaining length of the iterator. Read more
fn count(self) -> usize
Consumes the iterator, counting the number of iterations and returning it. Read more
fn last(self) -> Option<Self::Item>
Consumes the iterator, returning the last element. Read more
fn nth(&mut self, n: usize) -> Option<Self::Item>
Returns the n
th element of the iterator. Read more
fn chain<U>(self, other: U) -> Chain<Self, U::IntoIter> where U: IntoIterator<Item=Self::Item>
Takes two iterators and creates a new iterator over both in sequence. Read more
fn zip<U>(self, other: U) -> Zip<Self, U::IntoIter> where U: IntoIterator
'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
Takes a closure and creates an iterator which calls that closure on each element. Read more
fn filter<P>(self, predicate: P) -> Filter<Self, P> where P: FnMut(&Self::Item) -> bool
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>
Creates an iterator that both filters and maps. Read more
fn enumerate(self) -> Enumerate<Self>
Creates an iterator which gives the current iteration count as well as the next value. Read more
fn peekable(self) -> Peekable<Self>
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
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
Creates an iterator that yields elements based on a predicate. Read more
fn skip(self, n: usize) -> Skip<Self>
Creates an iterator that skips the first n
elements. Read more
fn take(self, n: usize) -> Take<Self>
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>
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
Creates an iterator that works like map, but flattens nested structure. Read more
fn fuse(self) -> Fuse<Self>
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) -> ()
Do something with each element of an iterator, passing the value on. Read more
fn by_ref(&mut self) -> &mut Self
Borrows an iterator, rather than consuming it. Read more
fn collect<B>(self) -> B where B: FromIterator<Self::Item>
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
Consumes an iterator, creating two collections from it. Read more
fn fold<B, F>(self, init: B, f: F) -> B where F: FnMut(B, Self::Item) -> B
An iterator adaptor 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
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
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
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
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
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
Returns the maximum element of an iterator. Read more
fn min(self) -> Option<Self::Item> where Self::Item: Ord
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
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)>
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
Creates an iterator which [clone()
]s all of its elements. Read more
fn cycle(self) -> Cycle<Self> where Self: Clone
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::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::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::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::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::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::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::Item>
Determines if the elements of this Iterator
are lexicographically greater than or equal to those of another. Read more
impl<'a, T> DoubleEndedIterator for Drain<'a, T>
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fn next_back(&mut self) -> Option<T>
Removes and returns an element from the end of the iterator. Read more
impl<'a, T> Drop for Drain<'a, T>
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fn drop(&mut self)
A method called when the value goes out of scope. Read more
impl<'a, T> ExactSizeIterator for Drain<'a, T>
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fn is_empty(&self) -> bool
Returns whether the iterator is empty. Read more
fn len(&self) -> usize
Returns the exact number of times the iterator will iterate. Read more
impl<'a, T> FusedIterator for Drain<'a, T>
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© 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/collections/vec/struct.Drain.html