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< main > < div class = "width-limiter" > < nav class = "sub" > < form class = "search-form" > < span > < / span > < div id = "sidebar-button" tabindex = "-1" > < a href = "../itertools/all.html" title = "show sidebar" > < / a > < / div > < input class = "search-input" name = "search" aria-label = "Run search in the documentation" autocomplete = "off" spellcheck = "false" placeholder = "Click or press ‘ ’ ‘ ’ type = "search" > < div id = "help-button" tabindex = "-1" > < a href = "../help.html" title = "help" > ?< / a > < / div > < div id = "settings-menu" tabindex = "-1" > < a href = "../settings.html" title = "settings" > < img width = "22" height = "22" alt = "Change settings" src = "../static.files/wheel-7b819b6101059cd0.svg" > < / a > < / div > < / form > < / nav > < section id = "main-content" class = "content" > < div class = "main-heading" > < h1 > Trait < a href = "index.html" > itertools< / a > ::< wbr > < a class = "trait" href = "#" > PeekingNext< / a > < button id = "copy-path" title = "Copy item path to clipboard" > < img src = "../static.files/clipboard-7571035ce49a181d.svg" width = "19" height = "18" alt = "Copy item path" > < / button > < / h1 > < span class = "out-of-band" > < a class = "src" href = "../src/itertools/peeking_take_while.rs.html#15-23" > source< / a > · < button id = "toggle-all-docs" title = "collapse all docs" > [< span > − < / span > ]< / button > < / span > < / div > < pre class = "rust item-decl" > < code > pub trait PeekingNext: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html" title = "trait core::iter::traits::iterator::Iterator" > Iterator< / a > {
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// Required method
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fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > >
< span class = "where" > where Self: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/marker/trait.Sized.html" title = "trait core::marker::Sized" > Sized< / a > ,
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > < / span > ;
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}< / code > < / pre > < details class = "toggle top-doc" open > < summary class = "hideme" > < span > Expand description< / span > < / summary > < div class = "docblock" > < p > An iterator that allows peeking at an element before deciding to accept it.< / p >
< p > See < a href = "trait.Itertools.html#method.peeking_take_while" title = "method itertools::Itertools::peeking_take_while" > < code > .peeking_take_while()< / code > < / a >
for more information.< / p >
< p > This is implemented by peeking adaptors like peekable and put back,
but also by a few iterators that can be peeked natively, like the slice’
by reference iterator (< code > std::slice::Iter< / code > ).< / p >
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< / div > < / details > < h2 id = "required-methods" class = "section-header" > Required Methods< a href = "#required-methods" class = "anchor" > §< / a > < / h2 > < div class = "methods" > < details class = "toggle method-toggle" open > < summary > < section id = "tymethod.peeking_next" class = "method" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#19-22" > source< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
Self: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/marker/trait.Sized.html" title = "trait core::marker::Sized" > Sized< / a > ,
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > Pass a reference to the next iterator element to the closure < code > accept< / code > ;
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if < code > accept< / code > returns true, return it as the next element,
else None.< / p >
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< / div > < / details > < / div > < h2 id = "foreign-impls" class = "section-header" > Implementations on Foreign Types< a href = "#foreign-impls" class = "anchor" > §< / a > < / h2 > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-Bytes%3C'a%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#190" > source< / a > < a href = "#impl-PeekingNext-for-Bytes%3C'a%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/str/iter/struct.Bytes.html" title = "struct core::str::iter::Bytes" > Bytes< / a > < 'a> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#190" > source< / a > < a href = "#method.peeking_next" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-CharIndices%3C'a%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#189" > source< / a > < a href = "#impl-PeekingNext-for-CharIndices%3C'a%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/str/iter/struct.CharIndices.html" title = "struct core::str::iter::CharIndices" > CharIndices< / a > < 'a> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-1" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#189" > source< / a > < a href = "#method.peeking_next-1" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-Chars%3C'a%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#188" > source< / a > < a href = "#impl-PeekingNext-for-Chars%3C'a%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/str/iter/struct.Chars.html" title = "struct core::str::iter::Chars" > Chars< / a > < 'a> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-2" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#188" > source< / a > < a href = "#method.peeking_next-2" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-%26mut+I" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#25-35" > source< / a > < a href = "#impl-PeekingNext-for-%26mut+I" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a, I> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.reference.html" > & 'a mut I< / a > < div class = "where" > where
I: < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > ,< / div > < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-3" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#29-34" > source< / a > < a href = "#method.peeking_next-3" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-Iter%3C'a,+T%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#195" > source< / a > < a href = "#impl-PeekingNext-for-Iter%3C'a,+T%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a, T> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/alloc/collections/linked_list/struct.Iter.html" title = "struct alloc::collections::linked_list::Iter" > Iter< / a > < 'a, T> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-4" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#195" > source< / a > < a href = "#method.peeking_next-4" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-Iter%3C'a,+T%3E-1" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#197" > source< / a > < a href = "#impl-PeekingNext-for-Iter%3C'a,+T%3E-1" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a, T> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/alloc/collections/vec_deque/iter/struct.Iter.html" title = "struct alloc::collections::vec_deque::iter::Iter" > Iter< / a > < 'a, T> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-5" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#197" > source< / a > < a href = "#method.peeking_next-5" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-Iter%3C'a,+T%3E-2" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#191" > source< / a > < a href = "#impl-PeekingNext-for-Iter%3C'a,+T%3E-2" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a, T> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/option/struct.Iter.html" title = "struct core::option::Iter" > Iter< / a > < 'a, T> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-6" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#191" > source< / a > < a href = "#method.peeking_next-6" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-Iter%3C'a,+T%3E-3" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#192" > source< / a > < a href = "#impl-PeekingNext-for-Iter%3C'a,+T%3E-3" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a, T> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/result/struct.Iter.html" title = "struct core::result::Iter" > Iter< / a > < 'a, T> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-7" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#192" > source< / a > < a href = "#method.peeking_next-7" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-Iter%3C'a,+T%3E-4" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#187" > source< / a > < a href = "#impl-PeekingNext-for-Iter%3C'a,+T%3E-4" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a, T> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/slice/iter/struct.Iter.html" title = "struct core::slice::iter::Iter" > Iter< / a > < 'a, T> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-8" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#187" > source< / a > < a href = "#method.peeking_next-8" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-Peekable%3CI%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#37-52" > source< / a > < a href = "#impl-PeekingNext-for-Peekable%3CI%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< I> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/iter/adapters/peekable/struct.Peekable.html" title = "struct core::iter::adapters::peekable::Peekable" > Peekable< / a > < I> < div class = "where" > where
I: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html" title = "trait core::iter::traits::iterator::Iterator" > Iterator< / a > ,< / div > < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-9" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#41-51" > source< / a > < a href = "#method.peeking_next-9" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-Rev%3CI%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#200-201" > source< / a > < a href = "#impl-PeekingNext-for-Rev%3CI%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< I: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/clone/trait.Clone.html" title = "trait core::clone::Clone" > Clone< / a > + < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > + < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/double_ended/trait.DoubleEndedIterator.html" title = "trait core::iter::traits::double_ended::DoubleEndedIterator" > DoubleEndedIterator< / a > > < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/iter/adapters/rev/struct.Rev.html" title = "struct core::iter::adapters::rev::Rev" > Rev< / a > < I> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-10" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#200-201" > source< / a > < a href = "#method.peeking_next-10" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-PeekingNext-for-Empty%3CT%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#193" > source< / a > < a href = "#impl-PeekingNext-for-Empty%3CT%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< T> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/iter/sources/empty/struct.Empty.html" title = "struct core::iter::sources::empty::Empty" > Empty< / a > < T> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.peeking_next-11" class = "method trait-impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#193" > source< / a > < a href = "#method.peeking_next-11" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.peeking_next" class = "fn" > peeking_next< / a > < F> (& mut self, accept: F) -> < a class = "enum" href = "https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title = "enum core::option::Option" > Option< / a > < Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > > < div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title = "trait core::ops::function::FnOnce" > FnOnce< / a > (& Self::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h4 > < / section > < / div > < / details > < h2 id = "implementors" class = "section-header" > Implementors< a href = "#implementors" class = "anchor" > §< / a > < / h2 > < div id = "implementors-list" > < section id = "impl-PeekingNext-for-PeekingTakeWhile%3C'a,+I,+F%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#151-163" > source< / a > < a href = "#impl-PeekingNext-for-PeekingTakeWhile%3C'a,+I,+F%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a, I, F> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "structs/struct.PeekingTakeWhile.html" title = "struct itertools::structs::PeekingTakeWhile" > PeekingTakeWhile< / a > < 'a, I, F> < div class = "where" > where
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I: < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > ,
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F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnMut.html" title = "trait core::ops::function::FnMut" > FnMut< / a > (& I::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title = "type core::iter::traits::iterator::Iterator::Item" > Item< / a > ) -> < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ,< / div > < / h3 > < / section > < section id = "impl-PeekingNext-for-MultiPeek%3CI%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/multipeek_impl.rs.html#68-89" > source< / a > < a href = "#impl-PeekingNext-for-MultiPeek%3CI%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< I> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "structs/struct.MultiPeek.html" title = "struct itertools::structs::MultiPeek" > MultiPeek< / a > < I> < div class = "where" > where
I: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html" title = "trait core::iter::traits::iterator::Iterator" > Iterator< / a > ,< / div > < / h3 > < / section > < section id = "impl-PeekingNext-for-PeekNth%3CI%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peek_nth.rs.html#167-178" > source< / a > < a href = "#impl-PeekingNext-for-PeekNth%3CI%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< I> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "structs/struct.PeekNth.html" title = "struct itertools::structs::PeekNth" > PeekNth< / a > < I> < div class = "where" > where
I: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html" title = "trait core::iter::traits::iterator::Iterator" > Iterator< / a > ,< / div > < / h3 > < / section > < section id = "impl-PeekingNext-for-PutBack%3CI%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#54-72" > source< / a > < a href = "#impl-PeekingNext-for-PutBack%3CI%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< I> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "structs/struct.PutBack.html" title = "struct itertools::structs::PutBack" > PutBack< / a > < I> < div class = "where" > where
I: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html" title = "trait core::iter::traits::iterator::Iterator" > Iterator< / a > ,< / div > < / h3 > < / section > < section id = "impl-PeekingNext-for-PutBackN%3CI%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#75-93" > source< / a > < a href = "#impl-PeekingNext-for-PutBackN%3CI%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< I> < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "structs/struct.PutBackN.html" title = "struct itertools::structs::PutBackN" > PutBackN< / a > < I> < div class = "where" > where
I: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html" title = "trait core::iter::traits::iterator::Iterator" > Iterator< / a > ,< / div > < / h3 > < / section > < section id = "impl-PeekingNext-for-RepeatN%3CT%3E" class = "impl" > < a class = "src rightside" href = "../src/itertools/peeking_take_while.rs.html#95-106" > source< / a > < a href = "#impl-PeekingNext-for-RepeatN%3CT%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< T: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/clone/trait.Clone.html" title = "trait core::clone::Clone" > Clone< / a > > < a class = "trait" href = "trait.PeekingNext.html" title = "trait itertools::PeekingNext" > PeekingNext< / a > for < a class = "struct" href = "structs/struct.RepeatN.html" title = "struct itertools::structs::RepeatN" > RepeatN< / a > < T> < / h3 > < / section > < / div > < script src = "../trait.impl/itertools/peeking_take_while/trait.PeekingNext.js" data-ignore-extern-crates = "alloc,core" async > < / script > < / section > < / div > < / main > < / body > < / html >
