Struct Inspect 

pub struct Inspect<I, F> { /* private fields */ }

A lending iterator that calls a function with a reference to each element before yielding it.

This struct is created by the inspect method on LendingIterator. See its documentation for more.

Trait Implementations

impl<I: Clone, F: Clone> Clone for Inspect<I, F>

fn clone(&self) -> Inspect<I, F>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<I: Debug, F> Debug for Inspect<I, F>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<I, F> LendingIterator for Inspect<I, F>

where I: LendingIterator, F: for<'a> FnMut(&I::Item<'a>),

type Item<'a> = <I as LendingIterator>::Item<'a> where Self: 'a

The type of the elements being iterated over.

fn next(&mut self) -> Option<Self::Item<'_>>

Advances the lending iterator and returns the next value.

fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the iterator.

fn count(self) -> usize

where Self: Sized,

Returns the number of items in the lending iterator.

fn advance_by(&mut self, n: usize) -> Result<(), NonZeroUsize>

Advances the lending iterator by n elements.

fn nth(&mut self, n: usize) -> Option<Self::Item<'_>>

Returns the nth element of the lending iterator.

fn step_by(self, step: usize) -> StepBy<Self>

where Self: Sized,

Creates a lending iterator starting at the same point, but stepping by the given amount at each iteration.

fn take(self, n: usize) -> Take<Self>

where Self: Sized,

Creates a lending iterator that lends the first n elements, or fewer if the underlying iterator ends sooner.

fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>

where Self: Sized, P: for<'a> FnMut(&Self::Item<'a>) -> bool,

Creates a lending iterator that lends items matching a predicate.

fn chain<I>(self, other: I) -> Chain<Self, I>

where Self: Sized, for<'a> I: LendingIterator<Item<'a> = Self::Item<'a>> + 'a,

Takes two lending iterators and creates a new lending iterator over both in sequence.

fn zip<I>(self, other: I) -> Zip<Self, I>

where Self: Sized, I: LendingIterator,

‘Zips up’ two lending iterators into a single lending iterator of pairs.

fn map<F>(self, f: F) -> Map<Self, F>

where Self: Sized, F: for<'a> SingleArgFnMut<Self::Item<'a>>,

Takes a closure and creates a lending iterator which calls that closure on each element.

fn for_each<F>(self, f: F)

where Self: Sized, F: FnMut(Self::Item<'_>),

Calls a closure on each element of the lending iterator.

fn filter<P>(self, predicate: P) -> Filter<Self, P>

where Self: Sized, P: for<'a> FnMut(&Self::Item<'a>) -> bool,

Creates a lending iterator which uses a closure to determine if an element should be yielded.

fn filter_map<F>(self, f: F) -> FilterMap<Self, F>

where Self: Sized, F: for<'a> SingleArgFnMut<Self::Item<'a>>, for<'a> <F as SingleArgFnOnce<Self::Item<'a>>>::Output: OptionTrait,

Creates a lending iterator that both filters and maps.

fn fold<B, F>(self, init: B, f: F) -> B

where Self: Sized, F: FnMut(B, Self::Item<'_>) -> B,

Folds every element into an accumulator by applying an operation, returning the final result.

fn cloned<T>(self) -> Cloned<Self>

where Self: Sized, for<'a> Self::Item<'a>: Deref<Target = T>, T: Clone,

Creates a lending iterator which clones all of its elements.

fn copied<T>(self) -> Copied<Self>

where Self: Sized, for<'a> Self::Item<'a>: Deref<Target = T>, T: Copy,

Creates a lending iterator which copies all of its elements.

fn enumerate(self) -> Enumerate<Self>

where Self: Sized,

Creates a lending iterator which gives the current iteration count as well as the next value.

fn skip(self, n: usize) -> Skip<Self>

where Self: Sized,

Creates a lending iterator that skips over the first n elements of self.

fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>

where Self: Sized, P: for<'a> FnMut(&Self::Item<'a>) -> bool,

Creates a lending iterator that rejects elements while predicate returns true.

fn inspect<F>(self, f: F) -> Inspect<Self, F>

where Self: Sized, F: for<'a> FnMut(&Self::Item<'a>),

Creates a lending iterator that yields the current element unchanged, while calling a provided function with a reference to that element.

fn scan<St, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>

where Self: Sized,

Creates a lending iterator that yields elements transformed by a stateful closure.

fn map_while<F>(self, f: F) -> MapWhile<Self, F>

where Self: Sized, F: for<'a> SingleArgFnMut<Self::Item<'a>>, for<'a> <F as SingleArgFnOnce<Self::Item<'a>>>::Output: OptionTrait,

Creates a lending iterator that yields elements while the predicate returns Some.

fn fuse(self) -> Fuse<Self>

where Self: Sized,

Creates a lending iterator that yields None forever after the underlying iterator yields None once.

fn cycle(self) -> Cycle<Self>

where Self: Sized + Clone,

Creates a lending iterator that repeats elements endlessly by cloning the iterator.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Borrows the lending iterator.

fn all<P>(&mut self, predicate: P) -> bool

where P: FnMut(Self::Item<'_>) -> bool,

Tests if every element of the iterator matches a predicate.

fn any<P>(&mut self, predicate: P) -> bool

where P: FnMut(Self::Item<'_>) -> bool,

Tests if any element of the iterator matches a predicate.

fn is_partitioned<P>(self, predicate: P) -> bool

where Self: Sized, P: FnMut(Self::Item<'_>) -> bool,

Checks if the elements of this iterator are partitioned according to the given predicate, such that all those that return true precede all those that return false.

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.

fn find_map<B, F>(&mut self, f: F) -> Option<B>

where F: FnMut(Self::Item<'_>) -> Option<B>,

Applies function to the elements of iterator and returns the first non-none result.

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.

fn cmp<I>(self, other: I) -> Ordering

where I: for<'a> LendingIterator<Item<'a> = Self::Item<'a>>, for<'a> Self::Item<'a>: Ord, Self: Sized,

Lexicographically compares the elements of this Iterator with those of another.

fn cmp_by<I, F>(self, other: I, cmp: F) -> Ordering

where Self: Sized, I: LendingIterator, F: FnMut(Self::Item<'_>, I::Item<'_>) -> Ordering,

Lexicographically compares the elements of this Iterator with those of another with respect to the specified comparison function.

fn partial_cmp<I>(self, other: I) -> Option<Ordering>

where I: LendingIterator, for<'a> Self::Item<'a>: PartialOrd<I::Item<'a>>, Self: Sized,

Lexicographically compares the PartialOrd elements of this Iterator with those of another. The comparison works like short-circuit evaluation, returning a result without comparing the remaining elements. As soon as an order can be determined, the evaluation stops and a result is returned.

fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>

where Self: Sized, I: LendingIterator, F: FnMut(Self::Item<'_>, I::Item<'_>) -> Option<Ordering>,

Lexicographically compares the elements of this Iterator with those of another with respect to the specified comparison function.

fn eq<I>(self, other: I) -> bool

where I: LendingIterator, for<'a> Self::Item<'a>: PartialEq<I::Item<'a>>, Self: Sized,

Determines if the elements of this Iterator are equal to those of another.

fn eq_by<I, F>(self, other: I, eq: F) -> bool

where Self: Sized, I: LendingIterator, F: FnMut(Self::Item<'_>, I::Item<'_>) -> bool,

Determines if the elements of this Iterator are equal to those of another with respect to the specified equality function.

fn ne<I>(self, other: I) -> bool

where I: LendingIterator, for<'a> Self::Item<'a>: PartialEq<I::Item<'a>>, Self: Sized,

Determines if the elements of this Iterator are not equal to those of another.

fn lt<I>(self, other: I) -> bool

where I: LendingIterator, for<'a> Self::Item<'a>: PartialOrd<I::Item<'a>>, Self: Sized,

Determines if the elements of this Iterator are lexicographically less than those of another.

fn le<I>(self, other: I) -> bool

where I: LendingIterator, for<'a> Self::Item<'a>: PartialOrd<I::Item<'a>>, Self: Sized,

Determines if the elements of this Iterator are lexicographically less or equal to those of another.

fn gt<I>(self, other: I) -> bool

where I: LendingIterator, for<'a> Self::Item<'a>: PartialOrd<I::Item<'a>>, Self: Sized,

Determines if the elements of this Iterator are lexicographically greater than those of another.

fn ge<I>(self, other: I) -> bool

where I: LendingIterator, for<'a> Self::Item<'a>: PartialOrd<I::Item<'a>>, Self: Sized,

Determines if the elements of this Iterator are lexicographically greater or equal to those of another.

fn reduce<B, F>(self, f: F) -> Option<B>

where Self: Sized, F: FnMut(B, Self::Item<'_>) -> B, B: for<'a> From<Self::Item<'a>>,

Reduces the elements to a single one, by repeatedly applying a reducing operation.

fn try_fold<B, F, E>(&mut self, init: B, f: F) -> Result<B, E>

where Self: Sized, F: FnMut(B, Self::Item<'_>) -> Result<B, E>,

An iterator method that applies a fallible function to each item in the iterator, stopping at the first error and returning that error.

fn try_for_each<F, E>(&mut self, f: F) -> Result<(), E>

where Self: Sized, F: FnMut(Self::Item<'_>) -> Result<(), E>,

An iterator method that applies a fallible function to each item in the iterator, stopping at the first error and returning that error.

fn try_find<F, R>(&mut self, f: F) -> Result<Option<Self::Item<'_>>, R>

where Self: Sized, F: FnMut(&Self::Item<'_>) -> Result<bool, R>,

Applies function to the elements of iterator and returns the first true result or the first error.

fn try_reduce<B, F, E>(self, f: F) -> Result<Option<B>, E>

where Self: Sized, F: FnMut(B, Self::Item<'_>) -> Result<B, E>, B: for<'a> From<Self::Item<'a>>,

Reduces the elements to a single one by repeatedly applying a reducing operation. If the closure returns a failure, the failure is propagated back to the caller immediately.

fn max<T>(self) -> Option<T>

where Self: Sized, for<'a> T: for<'a> From<Self::Item<'a>> + PartialOrd<Self::Item<'a>>,

Returns the maximum element of an iterator.

fn min<T>(self) -> Option<T>

where Self: Sized, for<'a> T: for<'a> From<Self::Item<'a>> + PartialOrd<Self::Item<'a>>,

Returns the minimum element of an iterator.

fn max_by<T, F>(self, compare: F) -> Option<T>

where Self: Sized, F: for<'a> FnMut(&T, &Self::Item<'a>) -> Ordering, T: for<'a> From<Self::Item<'a>>,

Returns the element that gives the maximum value from the specified function.

fn min_by<T, F>(self, compare: F) -> Option<T>

where Self: Sized, F: for<'a> FnMut(&T, &Self::Item<'a>) -> Ordering, T: for<'a> From<Self::Item<'a>>,

Returns the element that gives the minimum value from the specified function.

fn max_by_key<T, B, F>(self, f: F) -> Option<T>

where Self: Sized, B: Ord, F: for<'a> FnMut(&Self::Item<'a>) -> B, T: for<'a> From<Self::Item<'a>>,

Returns the element that gives the maximum value with respect to the specified key function.

fn min_by_key<T, B, F>(self, f: F) -> Option<T>

where Self: Sized, B: Ord, F: for<'a> FnMut(&Self::Item<'a>) -> B, T: for<'a> From<Self::Item<'a>>,

Returns the element that gives the minimum value with respect to the specified key function.

fn sum<S>(self) -> S

where Self: Sized, for<'a> S: AddAssign<Self::Item<'a>> + Default,

Sums the elements of an iterator.

fn product<P>(self) -> P

where Self: Sized, for<'a> P: MulAssign<Self::Item<'a>> + From<u8>,

Iterates over the entire iterator, multiplying all the elements