Trait peeking_take_while::PeekableExt [−][src]
pub trait PeekableExt<I>: Iterator where
I: Iterator, {
fn peeking_take_while<P>(
&mut self,
predicate: P
) -> PeekingTakeWhile<'_, I, P>ⓘNotable traits for PeekingTakeWhile<'_, I, P>impl<I, P> Iterator for PeekingTakeWhile<'_, I, P> where
I: Iterator,
P: FnMut(&I::Item) -> bool, type Item = I::Item;
where
P: FnMut(&Self::Item) -> bool;
}Expand description
The Iterator extension trait that provides the peeking_take_while
method.
See the module documentation for details.
Required methods
fn peeking_take_while<P>(&mut self, predicate: P) -> PeekingTakeWhile<'_, I, P>ⓘNotable traits for PeekingTakeWhile<'_, I, P>impl<I, P> Iterator for PeekingTakeWhile<'_, I, P> where
I: Iterator,
P: FnMut(&I::Item) -> bool, type Item = I::Item; where
P: FnMut(&Self::Item) -> bool,
fn peeking_take_while<P>(&mut self, predicate: P) -> PeekingTakeWhile<'_, I, P>ⓘNotable traits for PeekingTakeWhile<'_, I, P>impl<I, P> Iterator for PeekingTakeWhile<'_, I, P> where
I: Iterator,
P: FnMut(&I::Item) -> bool, type Item = I::Item; where
P: FnMut(&Self::Item) -> bool,
impl<I, P> Iterator for PeekingTakeWhile<'_, I, P> where
I: Iterator,
P: FnMut(&I::Item) -> bool, type Item = I::Item;The peeking_take_while method is very similar to take_while, but behaves
differently when used with a borrowed iterator (perhaps returned by
Iterator::by_ref).
peeking_take_while peeks at the next item in the iterator and runs the
predicate on that peeked item. This avoids consuming the first item yielded
by the underlying iterator for which the predicate returns false. On the
other hand, take_while will consume that first item for which the
predicate returns false, and it will be lost.
In contrast to take_while, iterating the iterator might call the predicate again
after it first returned false (the returned iterator isn’t fused).
If that is not intended, calling fuse on the returned iterator
prevents that.
Implementations on Foreign Types
fn peeking_take_while<P>(&mut self, predicate: P) -> PeekingTakeWhile<'_, I, P>ⓘNotable traits for PeekingTakeWhile<'_, I, P>impl<I, P> Iterator for PeekingTakeWhile<'_, I, P> where
I: Iterator,
P: FnMut(&I::Item) -> bool, type Item = I::Item; where
P: FnMut(&Self::Item) -> bool,
impl<I, P> Iterator for PeekingTakeWhile<'_, I, P> where
I: Iterator,
P: FnMut(&I::Item) -> bool, type Item = I::Item;