Trait fallible_iterator::FallibleIterator

source · 
pub trait FallibleIterator {
    type Item;
    type Error;


Show 43 methods    fn next(&mut self) -> Result<Option<Self::Item>, Self::Error>;

    fn size_hint(&self) -> (usize, Option<usize>) { ... }
    fn count(self) -> Result<usize, Self::Error>
    where
        Self: Sized,
    { ... }
    fn last(self) -> Result<Option<Self::Item>, Self::Error>
    where
        Self: Sized,
    { ... }
    fn nth(&mut self, n: usize) -> Result<Option<Self::Item>, Self::Error> { ... }
    fn step_by(self, step: usize) -> StepBy<Self>
    where
        Self: Sized,
    { ... }
    fn chain<I>(self, it: I) -> Chain<Self, I>
    where
        I: IntoFallibleIterator<Item = Self::Item, Error = Self::Error>,
        Self: Sized,
    { ... }
    fn zip<I>(self, o: I) -> Zip<Self, I::IntoIter>
    where
        Self: Sized,
        I: IntoFallibleIterator<Error = Self::Error>,
    { ... }
    fn map<F, B>(self, f: F) -> Map<Self, F>
    where
        Self: Sized,
        F: FnMut(Self::Item) -> Result<B, Self::Error>,
    { ... }
    fn for_each<F>(self, f: F) -> Result<(), Self::Error>
    where
        Self: Sized,
        F: FnMut(Self::Item) -> Result<(), Self::Error>,
    { ... }
    fn filter<F>(self, f: F) -> Filter<Self, F>
    where
        Self: Sized,
        F: FnMut(&Self::Item) -> Result<bool, Self::Error>,
    { ... }
    fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F>
    where
        Self: Sized,
        F: FnMut(Self::Item) -> Result<Option<B>, Self::Error>,
    { ... }
    fn enumerate(self) -> Enumerate<Self>
    where
        Self: Sized,
    { ... }
    fn peekable(self) -> Peekable<Self>
    where
        Self: Sized,
    { ... }
    fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>
    where
        Self: Sized,
        P: FnMut(&Self::Item) -> Result<bool, Self::Error>,
    { ... }
    fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>
    where
        Self: Sized,
        P: FnMut(&Self::Item) -> Result<bool, Self::Error>,
    { ... }
    fn skip(self, n: usize) -> Skip<Self>
    where
        Self: Sized,
    { ... }
    fn take(self, n: usize) -> Take<Self>
    where
        Self: Sized,
    { ... }
    fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>
    where
        Self: Sized,
        F: FnMut(&mut St, Self::Item) -> Result<Option<B>, Self::Error>,
    { ... }
    fn fuse(self) -> Fuse<Self>
    where
        Self: Sized,
    { ... }
    fn by_ref(&mut self) -> &mut Self
    where
        Self: Sized,
    { ... }
    fn collect<T>(self) -> Result<T, Self::Error>
    where
        T: FromFallibleIterator<Self::Item>,
        Self: Sized,
    { ... }
    fn fold<B, F>(self, init: B, f: F) -> Result<B, Self::Error>
    where
        Self: Sized,
        F: FnMut(B, Self::Item) -> Result<B, Self::Error>,
    { ... }
    fn all<F>(&mut self, f: F) -> Result<bool, Self::Error>
    where
        Self: Sized,
        F: FnMut(Self::Item) -> Result<bool, Self::Error>,
    { ... }
    fn any<F>(&mut self, f: F) -> Result<bool, Self::Error>
    where
        Self: Sized,
        F: FnMut(Self::Item) -> Result<bool, Self::Error>,
    { ... }
    fn find<F>(&mut self, f: F) -> Result<Option<Self::Item>, Self::Error>
    where
        Self: Sized,
        F: FnMut(&Self::Item) -> Result<bool, Self::Error>,
    { ... }
    fn position<F>(&mut self, f: F) -> Result<Option<usize>, Self::Error>
    where
        Self: Sized,
        F: FnMut(Self::Item) -> Result<bool, Self::Error>,
    { ... }
    fn max(self) -> Result<Option<Self::Item>, Self::Error>
    where
        Self: Sized,
        Self::Item: Ord,
    { ... }
    fn min(self) -> Result<Option<Self::Item>, Self::Error>
    where
        Self: Sized,
        Self::Item: Ord,
    { ... }
    fn max_by_key<B, F>(self, f: F) -> Result<Option<Self::Item>, Self::Error>
    where
        Self: Sized,
        B: Ord,
        F: FnMut(&Self::Item) -> Result<B, Self::Error>,
    { ... }
    fn min_by_key<B, F>(self, f: F) -> Result<Option<Self::Item>, Self::Error>
    where
        Self: Sized,
        B: Ord,
        F: FnMut(&Self::Item) -> Result<B, Self::Error>,
    { ... }
    fn rev(self) -> Rev<Self>
    where
        Self: Sized + DoubleEndedFallibleIterator,
    { ... }
    fn cloned<'a, T>(self) -> Cloned<Self>
    where
        Self: Sized + FallibleIterator<Item = &'a T>,
        T: 'a + Clone,
    { ... }
    fn cmp<I>(self, other: I) -> Result<Ordering, Self::Error>
    where
        Self: Sized,
        I: IntoFallibleIterator<Item = Self::Item, Error = Self::Error>,
        Self::Item: Ord,
    { ... }
    fn partial_cmp<I>(self, other: I) -> Result<Option<Ordering>, Self::Error>
    where
        Self: Sized,
        I: IntoFallibleIterator<Error = Self::Error>,
        Self::Item: PartialOrd<I::Item>,
    { ... }
    fn eq<I>(self, other: I) -> Result<bool, Self::Error>
    where
        Self: Sized,
        I: IntoFallibleIterator<Error = Self::Error>,
        Self::Item: PartialEq<I::Item>,
    { ... }
    fn ne<I>(self, other: I) -> Result<bool, Self::Error>
    where
        Self: Sized,
        I: IntoFallibleIterator<Error = Self::Error>,
        Self::Item: PartialEq<I::Item>,
    { ... }
    fn lt<I>(self, other: I) -> Result<bool, Self::Error>
    where
        Self: Sized,
        I: IntoFallibleIterator<Error = Self::Error>,
        Self::Item: PartialOrd<I::Item>,
    { ... }
    fn le<I>(self, other: I) -> Result<bool, Self::Error>
    where
        Self: Sized,
        I: IntoFallibleIterator<Error = Self::Error>,
        Self::Item: PartialOrd<I::Item>,
    { ... }
    fn gt<I>(self, other: I) -> Result<bool, Self::Error>
    where
        Self: Sized,
        I: IntoFallibleIterator<Error = Self::Error>,
        Self::Item: PartialOrd<I::Item>,
    { ... }
    fn ge<I>(self, other: I) -> Result<bool, Self::Error>
    where
        Self: Sized,
        I: IntoFallibleIterator<Error = Self::Error>,
        Self::Item: PartialOrd<I::Item>,
    { ... }
    fn iterator(self) -> Iterator<Self> ⓘ
    where
        Self: Sized,
    { ... }
    fn map_err<B, F>(self, f: F) -> MapErr<Self, F>
    where
        F: FnMut(Self::Error) -> B,
        Self: Sized,
    { ... }

}
Expand description

An Iterator-like trait that allows for calculation of items to fail.

Required Associated Types§

The type being iterated over.

The error type.

Required Methods§

Advances the iterator and returns the next value.

Returns Ok(None) when iteration is finished.

The behavior of calling this method after a previous call has returned Ok(None) or Err is implemenetation defined.

Provided Methods§

Returns bounds on the remaining length of the iterator.

Specifically, the first half of the returned tuple is a lower bound and the second half is an upper bound.

For the upper bound, None indicates that the upper bound is either unknown or larger than can be represented as a usize.

Both bounds assume that all remaining calls to next succeed. That is, next could return an Err in fewer calls than specified by the lower bound.

The default implementation returns (0, None), which is correct for any iterator.

Consumes the iterator, returning the number of remaining items.

Returns the last element of the iterator.

Returns the nth element of the iterator.

Returns an iterator starting at the same point, but stepping by the given amount at each iteration.

Panics

Panics if step is 0.

Returns an iterator which yields the elements of this iterator followed by another.

Returns an iterator that yields pairs of this iterator’s and another iterator’s values.

Returns an iterator which applies a fallible transform to the elements of the underlying iterator.

Calls a fallible closure on each element of an iterator.

Returns an iterator which uses a predicate to determine which values should be yielded. The predicate may fail; such failures are passed to the caller.

Returns an iterator which both filters and maps. The closure may fail; such failures are passed along to the consumer.

Returns an iterator which yields the current iteration count as well as the value.

Returns an iterator that can peek at the next element without consuming it.

Returns an iterator that skips elements based on a predicate.

Returns an iterator that yields elements based on a predicate.

Returns an iterator which skips the first n values of this iterator.

Returns an iterator that yields only the first n values of this iterator.

Returns an iterator which applies a stateful map to values of this iterator.

Returns an iterator which yields this iterator’s elements and ends after the first Ok(None).

The behavior of calling next after it has previously returned Ok(None) is normally unspecified. The iterator returned by this method guarantees that Ok(None) will always be returned.

Borrow an iterator rather than consuming it.

This is useful to allow the use of iterator adaptors that would otherwise consume the value.

Transforms the iterator into a collection.

An Err will be returned if any invocation of next returns Err.

Applies a function over the elements of the iterator, producing a single final value. The function may fail; such failures are returned to the caller.

Determines if all elements of this iterator match a predicate. The predicate may fail; such failures are passed to the caller.

Determines if any element of this iterator matches a predicate. The predicate may fail; such failures are passed to the caller.

Returns the first element of the iterator that matches a predicate. The predicate may fail; such failures are passed along to the caller.

Returns the position of the first element of this iterator that matches a predicate. The predicate may fail; such failures are returned to the caller.

Returns the maximal element of the iterator.

Returns the minimal element of the iterator.

Returns the element of the iterator which gives the maximum value from the function. The function may fail; such failures are returned to the caller.

Returns the element of the iterator which gives the minimum value from the function. The function may fail; such failures are returned to the caller.

Returns an iterator that yields this iterator’s items in the opposite order.

Returns an iterator which clones all of its elements.

Lexicographically compares the elements of this iterator to that of another.

Lexicographically compares the elements of this iterator to that of another.

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

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

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

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

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

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

Returns a normal (non-fallible) iterator over Result<Item, Error>.

Returns an iterator which applies a transform to the errors of the underlying iterator.

Implementations on Foreign Types§

Implementors§