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</pre><pre class="rust">
<span class="attribute">#![<span class="ident">warn</span>(<span class="ident">missing_docs</span>)]</span>
<span class="attribute">#![<span class="ident">crate_name</span><span class="op">=</span><span class="string">"itertools"</span>]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>), <span class="ident">no_std</span>)]</span>
<span class="doccomment">//! Itertools — extra iterator adaptors, functions and macros.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! To use the iterator methods in this crate, import the [`Itertools` trait](./trait.Itertools.html):</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use itertools::Itertools;</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Crate Features</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - `use_std`</span>
<span class="doccomment">//! - Enabled by default.</span>
<span class="doccomment">//! - Disable to compile itertools using `#![no_std]`. This disables</span>
<span class="doccomment">//! any items that depend on collections (like `group_by`, `unique`,</span>
<span class="doccomment">//! `kmerge`, `join` and many more).</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Rust Version</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This version of itertools requires Rust 1.12 or later.</span>
<span class="doccomment">//!</span>
<span class="attribute">#![<span class="ident">doc</span>(<span class="ident">html_root_url</span><span class="op">=</span><span class="string">"https://docs.rs/itertools/0.7/"</span>)]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">either</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>))]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">core</span> <span class="kw">as</span> <span class="ident">std</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">either::Either</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">use</span> <span class="ident">std::collections::HashMap</span>;
<span class="kw">use</span> <span class="ident">std::iter</span>::{<span class="ident">IntoIterator</span>};
<span class="kw">use</span> <span class="ident">std::cmp::Ordering</span>;
<span class="kw">use</span> <span class="ident">std::fmt</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">use</span> <span class="ident">std::hash::Hash</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">use</span> <span class="ident">std::fmt::Write</span>;
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">impl_macros</span>;
<span class="comment">// for compatibility with no std and macros</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std::iter</span> <span class="kw">as</span> <span class="ident">__std_iter</span>;
<span class="doccomment">/// The concrete iterator types.</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">structs</span> {
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">adaptors</span>::{
<span class="ident">Dedup</span>,
<span class="ident">Interleave</span>,
<span class="ident">InterleaveShortest</span>,
<span class="ident">Product</span>,
<span class="ident">PutBack</span>,
<span class="ident">Batching</span>,
<span class="ident">Step</span>,
<span class="ident">MapResults</span>,
<span class="ident">Merge</span>,
<span class="ident">MergeBy</span>,
<span class="ident">TakeWhileRef</span>,
<span class="ident">WhileSome</span>,
<span class="ident">Coalesce</span>,
<span class="ident">TupleCombinations</span>,
<span class="ident">Flatten</span>,
<span class="ident">Positions</span>,
<span class="ident">Update</span>,
};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">adaptors::MultiProduct</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">combinations::Combinations</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">cons_tuples_impl::ConsTuples</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">format</span>::{<span class="ident">Format</span>, <span class="ident">FormatWith</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">groupbylazy</span>::{<span class="ident">IntoChunks</span>, <span class="ident">Chunk</span>, <span class="ident">Chunks</span>, <span class="ident">GroupBy</span>, <span class="ident">Group</span>, <span class="ident">Groups</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">intersperse::Intersperse</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">kmerge_impl</span>::{<span class="ident">KMerge</span>, <span class="ident">KMergeBy</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">merge_join::MergeJoinBy</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">multipeek_impl::MultiPeek</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">pad_tail::PadUsing</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">peeking_take_while::PeekingTakeWhile</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">process_results_impl::ProcessResults</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">put_back_n_impl::PutBackN</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">rciter_impl::RcIter</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">repeatn::RepeatN</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">sources</span>::{<span class="ident">RepeatCall</span>, <span class="ident">Unfold</span>, <span class="ident">Iterate</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">tee::Tee</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">tuple_impl</span>::{<span class="ident">TupleBuffer</span>, <span class="ident">TupleWindows</span>, <span class="ident">Tuples</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">unique_impl</span>::{<span class="ident">Unique</span>, <span class="ident">UniqueBy</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">with_position::WithPosition</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">zip_eq_impl::ZipEq</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">zip_longest::ZipLongest</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">ziptuple::Zip</span>;
}
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">structs</span>::<span class="kw-2">*</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">adaptors::flatten</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">concat_impl::concat</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">cons_tuples_impl::cons_tuples</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">diff::diff_with</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">diff::Diff</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">kmerge_impl</span>::{<span class="ident">kmerge_by</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">minmax::MinMaxResult</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">peeking_take_while::PeekingNext</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">process_results_impl::process_results</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">repeatn::repeat_n</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">sources</span>::{<span class="ident">repeat_call</span>, <span class="ident">unfold</span>, <span class="ident">iterate</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">with_position::Position</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">ziptuple::multizip</span>;
<span class="kw">mod</span> <span class="ident">adaptors</span>;
<span class="kw">mod</span> <span class="ident">either_or_both</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">either_or_both::EitherOrBoth</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">free</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">inline</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">free</span>::<span class="kw-2">*</span>;
<span class="kw">mod</span> <span class="ident">concat_impl</span>;
<span class="kw">mod</span> <span class="ident">cons_tuples_impl</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">combinations</span>;
<span class="kw">mod</span> <span class="ident">diff</span>;
<span class="kw">mod</span> <span class="ident">format</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">group_map</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">groupbylazy</span>;
<span class="kw">mod</span> <span class="ident">intersperse</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">kmerge_impl</span>;
<span class="kw">mod</span> <span class="ident">merge_join</span>;
<span class="kw">mod</span> <span class="ident">minmax</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">multipeek_impl</span>;
<span class="kw">mod</span> <span class="ident">pad_tail</span>;
<span class="kw">mod</span> <span class="ident">peeking_take_while</span>;
<span class="kw">mod</span> <span class="ident">process_results_impl</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">put_back_n_impl</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">rciter_impl</span>;
<span class="kw">mod</span> <span class="ident">repeatn</span>;
<span class="kw">mod</span> <span class="ident">size_hint</span>;
<span class="kw">mod</span> <span class="ident">sources</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">tee</span>;
<span class="kw">mod</span> <span class="ident">tuple_impl</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">unique_impl</span>;
<span class="kw">mod</span> <span class="ident">with_position</span>;
<span class="kw">mod</span> <span class="ident">zip_eq_impl</span>;
<span class="kw">mod</span> <span class="ident">zip_longest</span>;
<span class="kw">mod</span> <span class="ident">ziptuple</span>;
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="doccomment">/// Create an iterator over the “cartesian product” of iterators.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is like `(A, B, ..., E)` if formed</span>
<span class="doccomment">/// from iterators `(I, J, ..., M)` with element types `I::Item = A`, `J::Item = B`, etc.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use] extern crate itertools;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// // Iterate over the coordinates of a 4 x 4 x 4 grid</span>
<span class="doccomment">/// // from (0, 0, 0), (0, 0, 1), .., (0, 1, 0), (0, 1, 1), .. etc until (3, 3, 3)</span>
<span class="doccomment">/// for (i, j, k) in iproduct!(0..4, 0..4, 0..4) {</span>
<span class="doccomment">/// // ..</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Note:** To enable the macros in this crate, use the `#[macro_use]`</span>
<span class="doccomment">/// attribute when importing the crate:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use] extern crate itertools;</span>
<span class="doccomment">/// # fn main() { }</span>
<span class="doccomment">/// ```</span>
<span class="macro">macro_rules!</span> <span class="ident">iproduct</span> {
(@<span class="ident">flatten</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">I</span>:<span class="ident">expr</span>,) <span class="op">=</span><span class="op">></span> (
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">I</span>
);
(@<span class="ident">flatten</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">I</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">J</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">K</span>:<span class="ident">expr</span>,)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> (
<span class="macro">iproduct!</span>(@<span class="ident">flatten</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::cons_tuples</span>(<span class="macro">iproduct!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">I</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">J</span>)), $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">K</span>,)<span class="kw-2">*</span>)
);
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">I</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (
<span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::__std_iter::IntoIterator::into_iter</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">I</span>)
);
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">I</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">J</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (
<span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::Itertools::cartesian_product</span>(<span class="macro">iproduct!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">I</span>), <span class="macro">iproduct!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">J</span>))
);
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">I</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">J</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">K</span>:<span class="ident">expr</span>),<span class="op">+</span>) <span class="op">=</span><span class="op">></span> (
<span class="macro">iproduct!</span>(@<span class="ident">flatten</span> <span class="macro">iproduct!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">I</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">J</span>), $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">K</span>,)<span class="op">+</span>)
);
}
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="doccomment">/// Create an iterator running multiple iterators in lockstep.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `izip!` iterator yields elements until any subiterator</span>
<span class="doccomment">/// returns `None`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is a version of the standard ``.zip()`` that's supporting more than</span>
<span class="doccomment">/// two iterators. The iterator elment type is a tuple with one element</span>
<span class="doccomment">/// from each of the input iterators. Just like ``.zip()``, the iteration stops</span>
<span class="doccomment">/// when the shortest of the inputs reaches its end.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Note:** The result of this macro is an iterator composed of</span>
<span class="doccomment">/// repeated `.zip()` and a `.map()`; it has an anonymous type.</span>
<span class="doccomment">/// Prefer this macro `izip!()` over [`multizip`] for the performance benefits</span>
<span class="doccomment">/// of using the standard library `.zip()`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`multizip`]: fn.multizip.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use] extern crate itertools;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // iterate over three sequences side-by-side</span>
<span class="doccomment">/// let mut results = [0, 0, 0, 0];</span>
<span class="doccomment">/// let inputs = [3, 7, 9, 6];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for (r, index, input) in izip!(&mut results, 0..10, &inputs) {</span>
<span class="doccomment">/// *r = index * 10 + input;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(results, [0 + 3, 10 + 7, 29, 36]);</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Note:** To enable the macros in this crate, use the `#[macro_use]`</span>
<span class="doccomment">/// attribute when importing the crate:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use] extern crate itertools;</span>
<span class="doccomment">/// # fn main() { }</span>
<span class="doccomment">/// ```</span>
<span class="macro">macro_rules!</span> <span class="ident">izip</span> {
<span class="comment">// @closure creates a tuple-flattening closure for .map() call. usage:</span>
<span class="comment">// @closure partial_pattern => partial_tuple , rest , of , iterators</span>
<span class="comment">// eg. izip!( @closure ((a, b), c) => (a, b, c) , dd , ee )</span>
( @<span class="ident">closure</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">p</span>:<span class="ident">pat</span> <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tup</span>:<span class="ident">expr</span> ) <span class="op">=</span><span class="op">></span> {
<span class="op">|</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">p</span><span class="op">|</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tup</span>
};
<span class="comment">// The "b" identifier is a different identifier on each recursion level thanks to hygiene.</span>
( @<span class="ident">closure</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">p</span>:<span class="ident">pat</span> <span class="op">=</span><span class="op">></span> ( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tup</span>:<span class="ident">tt</span>)<span class="op">*</span> ) , <span class="macro-nonterminal">$</span><span class="macro-nonterminal">_iter</span>:<span class="ident">expr</span> $( , <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tail</span>:<span class="ident">expr</span> )<span class="op">*</span> ) <span class="op">=</span><span class="op">></span> {
<span class="macro">izip!</span>(@<span class="ident">closure</span> (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">p</span>, <span class="ident">b</span>) <span class="op">=</span><span class="op">></span> ( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tup</span>)<span class="kw-2">*</span>, <span class="ident">b</span> ) $( , <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tail</span> )<span class="kw-2">*</span>)
};
( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">first</span>:<span class="ident">expr</span> $( , <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">expr</span> )<span class="op">*</span> $(,)<span class="op">*</span> ) <span class="op">=</span><span class="op">></span> {
<span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::__std_iter::IntoIterator::into_iter</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">first</span>)
$(
.<span class="ident">zip</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)
)<span class="op">*</span>
.<span class="ident">map</span>(
<span class="macro">izip!</span>(@<span class="ident">closure</span> <span class="ident">a</span> <span class="op">=</span><span class="op">></span> (<span class="ident">a</span>) $( , <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span> )<span class="kw-2">*</span>)
)
};
}
<span class="doccomment">/// The trait `Itertools`: extra iterator adaptors and methods for iterators.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This trait defines a number of methods. They are divided into two groups:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * *Adaptors* take an iterator and parameter as input, and return</span>
<span class="doccomment">/// a new iterator value. These are listed first in the trait. An example</span>
<span class="doccomment">/// of an adaptor is [`.interleave()`](#method.interleave)</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * *Regular methods* are those that don't return iterators and instead</span>
<span class="doccomment">/// return a regular value of some other kind.</span>
<span class="doccomment">/// [`.next_tuple()`](#method.next_tuple) is an example and the first regular</span>
<span class="doccomment">/// method in the list.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Itertools</span> : <span class="ident">Iterator</span> {
<span class="comment">// adaptors</span>
<span class="doccomment">/// Alternate elements from two iterators until both have run out.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator is *fused*.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it = (1..7).interleave(vec![-1, -2]);</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![1, -1, 2, -2, 3, 4, 5, 6]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">interleave</span><span class="op"><</span><span class="ident">J</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">J</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Interleave</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">J::IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">J</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>,
<span class="self">Self</span>: <span class="ident">Sized</span>
{
<span class="ident">interleave</span>(<span class="self">self</span>, <span class="ident">other</span>)
}
<span class="doccomment">/// Alternate elements from two iterators until at least one of them has run</span>
<span class="doccomment">/// out.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it = (1..7).interleave_shortest(vec![-1, -2]);</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![1, -1, 2, -2, 3]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">interleave_shortest</span><span class="op"><</span><span class="ident">J</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">J</span>) <span class="op">-</span><span class="op">></span> <span class="ident">InterleaveShortest</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">J::IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">J</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>,
<span class="self">Self</span>: <span class="ident">Sized</span>
{
<span class="ident">adaptors::interleave_shortest</span>(<span class="self">self</span>, <span class="ident">other</span>.<span class="ident">into_iter</span>())
}
<span class="doccomment">/// An iterator adaptor to insert a particular value</span>
<span class="doccomment">/// between each element of the adapted iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator is *fused*.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// itertools::assert_equal((0..3).intersperse(8), vec![0, 8, 1, 8, 2]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">intersperse</span>(<span class="self">self</span>, <span class="ident">element</span>: <span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Intersperse</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">Clone</span>
{
<span class="ident">intersperse::intersperse</span>(<span class="self">self</span>, <span class="ident">element</span>)
}
<span class="doccomment">/// Create an iterator which iterates over both this and the specified</span>
<span class="doccomment">/// iterator simultaneously, yielding pairs of two optional elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator is *fused*.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// As long as neither input iterator is exhausted yet, it yields two values</span>
<span class="doccomment">/// via `EitherOrBoth::Both`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When the parameter iterator is exhausted, it only yields a value from the</span>
<span class="doccomment">/// `self` iterator via `EitherOrBoth::Left`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When the `self` iterator is exhausted, it only yields a value from the</span>
<span class="doccomment">/// parameter iterator via `EitherOrBoth::Right`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When both iterators return `None`, all further invocations of `.next()`</span>
<span class="doccomment">/// will return `None`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is</span>
<span class="doccomment">/// [`EitherOrBoth<Self::Item, J::Item>`](enum.EitherOrBoth.html).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use itertools::EitherOrBoth::{Both, Right};</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">/// let it = (0..1).zip_longest(1..3);</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![Both(0, 1), Right(2)]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">zip_longest</span><span class="op"><</span><span class="ident">J</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">J</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ZipLongest</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">J::IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">J</span>: <span class="ident">IntoIterator</span>,
<span class="self">Self</span>: <span class="ident">Sized</span>
{
<span class="ident">zip_longest::zip_longest</span>(<span class="self">self</span>, <span class="ident">other</span>.<span class="ident">into_iter</span>())
}
<span class="doccomment">/// Create an iterator which iterates over both this and the specified</span>
<span class="doccomment">/// iterator simultaneously, yielding pairs of elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if the iterators reach an end and they are not of equal</span>
<span class="doccomment">/// lengths.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">zip_eq</span><span class="op"><</span><span class="ident">J</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">J</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ZipEq</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">J::IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">J</span>: <span class="ident">IntoIterator</span>,
<span class="self">Self</span>: <span class="ident">Sized</span>
{
<span class="ident">zip_eq</span>(<span class="self">self</span>, <span class="ident">other</span>)
}
<span class="doccomment">/// A “meta iterator adaptor”. Its closure receives a reference to the</span>
<span class="doccomment">/// iterator and may pick off as many elements as it likes, to produce the</span>
<span class="doccomment">/// next iterator element.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `B`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // An adaptor that gathers elements in pairs</span>
<span class="doccomment">/// let pit = (0..4).batching(|it| {</span>
<span class="doccomment">/// match it.next() {</span>
<span class="doccomment">/// None => None,</span>
<span class="doccomment">/// Some(x) => match it.next() {</span>
<span class="doccomment">/// None => None,</span>
<span class="doccomment">/// Some(y) => Some((x, y)),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// itertools::assert_equal(pit, vec![(0, 1), (2, 3)]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="kw">fn</span> <span class="ident">batching</span><span class="op"><</span><span class="ident">B</span>, <span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Batching</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>,
<span class="self">Self</span>: <span class="ident">Sized</span>
{
<span class="ident">adaptors::batching</span>(<span class="self">self</span>, <span class="ident">f</span>)
}
<span class="doccomment">/// Return an *iterable* that can group iterator elements.</span>
<span class="doccomment">/// Consecutive elements that map to the same key (“runs”), are assigned</span>
<span class="doccomment">/// to the same group.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `GroupBy` is the storage for the lazy grouping operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the groups are consumed in order, or if each group's iterator is</span>
<span class="doccomment">/// dropped without keeping it around, then `GroupBy` uses no</span>
<span class="doccomment">/// allocations. It needs allocations only if several group iterators</span>
<span class="doccomment">/// are alive at the same time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type implements `IntoIterator` (it is **not** an iterator</span>
<span class="doccomment">/// itself), because the group iterators need to borrow from this</span>
<span class="doccomment">/// value. It should be stored in a local variable or temporary and</span>
<span class="doccomment">/// iterated.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `(K, Group)`: the group's key and the</span>
<span class="doccomment">/// group iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // group data into runs of larger than zero or not.</span>
<span class="doccomment">/// let data = vec![1, 3, -2, -2, 1, 0, 1, 2];</span>
<span class="doccomment">/// // groups: |---->|------>|--------->|</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Note: The `&` is significant here, `GroupBy` is iterable</span>
<span class="doccomment">/// // only by reference. You can also call `.into_iter()` explicitly.</span>
<span class="doccomment">/// for (key, group) in &data.into_iter().group_by(|elt| *elt >= 0) {</span>
<span class="doccomment">/// // Check that the sum of each group is +/- 4.</span>
<span class="doccomment">/// assert_eq!(4, group.sum::<i32>().abs());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">group_by</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">key</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">GroupBy</span><span class="op"><</span><span class="ident">K</span>, <span class="self">Self</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">K</span>,
<span class="ident">K</span>: <span class="ident">PartialEq</span>,
{
<span class="ident">groupbylazy::new</span>(<span class="self">self</span>, <span class="ident">key</span>)
}
<span class="doccomment">/// Return an *iterable* that can chunk the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Yield subiterators (chunks) that each yield a fixed number elements,</span>
<span class="doccomment">/// determined by `size`. The last chunk will be shorter if there aren't</span>
<span class="doccomment">/// enough elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `IntoChunks` is based on `GroupBy`: it is iterable (implements</span>
<span class="doccomment">/// `IntoIterator`, **not** `Iterator`), and it only buffers if several</span>
<span class="doccomment">/// chunk iterators are alive at the same time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Chunk`, each chunk's iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if `size` is 0.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = vec![1, 1, 2, -2, 6, 0, 3, 1];</span>
<span class="doccomment">/// //chunk size=3 |------->|-------->|--->|</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Note: The `&` is significant here, `IntoChunks` is iterable</span>
<span class="doccomment">/// // only by reference. You can also call `.into_iter()` explicitly.</span>
<span class="doccomment">/// for chunk in &data.into_iter().chunks(3) {</span>
<span class="doccomment">/// // Check that the sum of each chunk is 4.</span>
<span class="doccomment">/// assert_eq!(4, chunk.sum());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">chunks</span>(<span class="self">self</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">IntoChunks</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
{
<span class="macro">assert!</span>(<span class="ident">size</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span>);
<span class="ident">groupbylazy::new_chunks</span>(<span class="self">self</span>, <span class="ident">size</span>)
}
<span class="doccomment">/// Return an iterator over all contiguous windows producing tuples of</span>
<span class="doccomment">/// a specific size (up to 4).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `tuple_windows` clones the iterator elements so that they can be</span>
<span class="doccomment">/// part of successive windows, this makes it most suited for iterators</span>
<span class="doccomment">/// of references and other values that are cheap to copy.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">/// let mut v = Vec::new();</span>
<span class="doccomment">/// for (a, b) in (1..5).tuple_windows() {</span>
<span class="doccomment">/// v.push((a, b));</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(v, vec![(1, 2), (2, 3), (3, 4)]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut it = (1..5).tuple_windows();</span>
<span class="doccomment">/// assert_eq!(Some((1, 2, 3)), it.next());</span>
<span class="doccomment">/// assert_eq!(Some((2, 3, 4)), it.next());</span>
<span class="doccomment">/// assert_eq!(None, it.next());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // this requires a type hint</span>
<span class="doccomment">/// let it = (1..5).tuple_windows::<(_, _, _)>();</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![(1, 2, 3), (2, 3, 4)]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // you can also specify the complete type</span>
<span class="doccomment">/// use itertools::TupleWindows;</span>
<span class="doccomment">/// use std::ops::Range;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it: TupleWindows<Range<u32>, (u32, u32, u32)> = (1..5).tuple_windows();</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![(1, 2, 3), (2, 3, 4)]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">tuple_windows</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TupleWindows</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T::Item</span><span class="op">></span>,
<span class="ident">T</span>: <span class="ident">tuple_impl::TupleCollect</span>,
<span class="ident">T::Item</span>: <span class="ident">Clone</span>
{
<span class="ident">tuple_impl::tuple_windows</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return an iterator that groups the items in tuples of a specific size</span>
<span class="doccomment">/// (up to 4).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See also the method [`.next_tuple()`](#method.next_tuple).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">/// let mut v = Vec::new();</span>
<span class="doccomment">/// for (a, b) in (1..5).tuples() {</span>
<span class="doccomment">/// v.push((a, b));</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(v, vec![(1, 2), (3, 4)]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut it = (1..7).tuples();</span>
<span class="doccomment">/// assert_eq!(Some((1, 2, 3)), it.next());</span>
<span class="doccomment">/// assert_eq!(Some((4, 5, 6)), it.next());</span>
<span class="doccomment">/// assert_eq!(None, it.next());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // this requires a type hint</span>
<span class="doccomment">/// let it = (1..7).tuples::<(_, _, _)>();</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![(1, 2, 3), (4, 5, 6)]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // you can also specify the complete type</span>
<span class="doccomment">/// use itertools::Tuples;</span>
<span class="doccomment">/// use std::ops::Range;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it: Tuples<Range<u32>, (u32, u32, u32)> = (1..7).tuples();</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![(1, 2, 3), (4, 5, 6)]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See also [`Tuples::into_buffer`](structs/struct.Tuples.html#method.into_buffer).</span>
<span class="kw">fn</span> <span class="ident">tuples</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Tuples</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T::Item</span><span class="op">></span>,
<span class="ident">T</span>: <span class="ident">tuple_impl::TupleCollect</span>
{
<span class="ident">tuple_impl::tuples</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Split into an iterator pair that both yield all elements from</span>
<span class="doccomment">/// the original iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Note:** If the iterator is clonable, prefer using that instead</span>
<span class="doccomment">/// of using this method. It is likely to be more efficient.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">/// let xs = vec![0, 1, 2, 3];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (mut t1, t2) = xs.into_iter().tee();</span>
<span class="doccomment">/// itertools::assert_equal(t1.next(), Some(0));</span>
<span class="doccomment">/// itertools::assert_equal(t2, 0..4);</span>
<span class="doccomment">/// itertools::assert_equal(t1, 1..4);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">tee</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">Tee</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>, <span class="ident">Tee</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>)
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">Clone</span>
{
<span class="ident">tee::new</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return an iterator adaptor that steps `n` elements in the base iterator</span>
<span class="doccomment">/// for each iteration.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The iterator steps by yielding the next element from the base iterator,</span>
<span class="doccomment">/// then skipping forward `n - 1` elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if the step is 0.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it = (0..8).step(3);</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![0, 3, 6]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">step</span>(<span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Step</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>
{
<span class="ident">adaptors::step</span>(<span class="self">self</span>, <span class="ident">n</span>)
}
<span class="doccomment">/// Return an iterator adaptor that applies the provided closure</span>
<span class="doccomment">/// to every `Result::Ok` value. `Result::Err` values are</span>
<span class="doccomment">/// unchanged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let input = vec![Ok(41), Err(false), Ok(11)];</span>
<span class="doccomment">/// let it = input.into_iter().map_results(|i| i + 1);</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![Ok(42), Err(false), Ok(12)]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">map_results</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">T</span>, <span class="ident">U</span>, <span class="ident">E</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">MapResults</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">></span><span class="op">></span> <span class="op">+</span> <span class="ident">Sized</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">U</span>,
{
<span class="ident">adaptors::map_results</span>(<span class="self">self</span>, <span class="ident">f</span>)
}
<span class="doccomment">/// Return an iterator adaptor that merges the two base iterators in</span>
<span class="doccomment">/// ascending order. If both base iterators are sorted (ascending), the</span>
<span class="doccomment">/// result is sorted.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = (0..11).step(3);</span>
<span class="doccomment">/// let b = (0..11).step(5);</span>
<span class="doccomment">/// let it = a.merge(b);</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![0, 0, 3, 5, 6, 9, 10]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">merge</span><span class="op"><</span><span class="ident">J</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">J</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Merge</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">J::IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">PartialOrd</span>,
<span class="ident">J</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>
{
<span class="ident">merge</span>(<span class="self">self</span>, <span class="ident">other</span>)
}
<span class="doccomment">/// Return an iterator adaptor that merges the two base iterators in order.</span>
<span class="doccomment">/// This is much like `.merge()` but allows for a custom ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This can be especially useful for sequences of tuples.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = (0..).zip("bc".chars());</span>
<span class="doccomment">/// let b = (0..).zip("ad".chars());</span>
<span class="doccomment">/// let it = a.merge_by(b, |x, y| x.1 <= y.1);</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![(0, 'a'), (0, 'b'), (1, 'c'), (1, 'd')]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">merge_by</span><span class="op"><</span><span class="ident">J</span>, <span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">J</span>, <span class="ident">is_first</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">MergeBy</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">J::IntoIter</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">J</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>, <span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span>
{
<span class="ident">adaptors::merge_by_new</span>(<span class="self">self</span>, <span class="ident">other</span>.<span class="ident">into_iter</span>(), <span class="ident">is_first</span>)
}
<span class="doccomment">/// Create an iterator that merges items from both this and the specified</span>
<span class="doccomment">/// iterator in ascending order.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It chooses whether to pair elements based on the `Ordering` returned by the</span>
<span class="doccomment">/// specified compare function. At any point, inspecting the tip of the</span>
<span class="doccomment">/// iterators `I` and `J` as items `i` of type `I::Item` and `j` of type</span>
<span class="doccomment">/// `J::Item` respectively, the resulting iterator will:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - Emit `EitherOrBoth::Left(i)` when `i < j`,</span>
<span class="doccomment">/// and remove `i` from its source iterator</span>
<span class="doccomment">/// - Emit `EitherOrBoth::Right(j)` when `i > j`,</span>
<span class="doccomment">/// and remove `j` from its source iterator</span>
<span class="doccomment">/// - Emit `EitherOrBoth::Both(i, j)` when `i == j`,</span>
<span class="doccomment">/// and remove both `i` and `j` from their respective source iterators</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">/// use itertools::EitherOrBoth::{Left, Right, Both};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let ki = (0..10).step(3);</span>
<span class="doccomment">/// let ku = (0..10).step(5);</span>
<span class="doccomment">/// let ki_ku = ki.merge_join_by(ku, |i, j| i.cmp(j)).map(|either| {</span>
<span class="doccomment">/// match either {</span>
<span class="doccomment">/// Left(_) => "Ki",</span>
<span class="doccomment">/// Right(_) => "Ku",</span>
<span class="doccomment">/// Both(_, _) => "KiKu"</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// itertools::assert_equal(ki_ku, vec!["KiKu", "Ki", "Ku", "Ki", "Ki"]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">merge_join_by</span><span class="op"><</span><span class="ident">J</span>, <span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">J</span>, <span class="ident">cmp_fn</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">MergeJoinBy</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">J::IntoIter</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">J</span>: <span class="ident">IntoIterator</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>, <span class="kw-2">&</span><span class="ident">J::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">std::cmp::Ordering</span>,
<span class="self">Self</span>: <span class="ident">Sized</span>
{
<span class="ident">merge_join_by</span>(<span class="self">self</span>, <span class="ident">other</span>, <span class="ident">cmp_fn</span>)
}
<span class="doccomment">/// Return an iterator adaptor that flattens an iterator of iterators by</span>
<span class="doccomment">/// merging them in ascending order.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If all base iterators are sorted (ascending), the result is sorted.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = (0..6).step(3);</span>
<span class="doccomment">/// let b = (1..6).step(3);</span>
<span class="doccomment">/// let c = (2..6).step(3);</span>
<span class="doccomment">/// let it = vec![a, b, c].into_iter().kmerge();</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![0, 1, 2, 3, 4, 5]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">kmerge</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">KMerge</span><span class="op"><</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">></span><span class="ident">::IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">IntoIterator</span>,
<span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">></span><span class="ident">::Item</span>: <span class="ident">PartialOrd</span>,
{
<span class="ident">kmerge</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return an iterator adaptor that flattens an iterator of iterators by</span>
<span class="doccomment">/// merging them according to the given closure.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The closure `first` is called with two elements *a*, *b* and should</span>
<span class="doccomment">/// return `true` if *a* is ordered before *b*.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If all base iterators are sorted according to `first`, the result is</span>
<span class="doccomment">/// sorted.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = vec![-1f64, 2., 3., -5., 6., -7.];</span>
<span class="doccomment">/// let b = vec![0., 2., -4.];</span>
<span class="doccomment">/// let mut it = vec![a, b].into_iter().kmerge_by(|a, b| a.abs() < b.abs());</span>
<span class="doccomment">/// assert_eq!(it.next(), Some(0.));</span>
<span class="doccomment">/// assert_eq!(it.last(), Some(-7.));</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">kmerge_by</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">first</span>: <span class="ident">F</span>)
<span class="op">-</span><span class="op">></span> <span class="ident">KMergeBy</span><span class="op"><</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">></span><span class="ident">::IntoIter</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">IntoIterator</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">></span><span class="ident">::Item</span>,
<span class="kw-2">&</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">></span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span>
{
<span class="ident">kmerge_by</span>(<span class="self">self</span>, <span class="ident">first</span>)
}
<span class="doccomment">/// Return an iterator adaptor that iterates over the cartesian product of</span>
<span class="doccomment">/// the element sets of two iterators `self` and `J`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `(Self::Item, J::Item)`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it = (0..2).cartesian_product("αβ".chars());</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![(0, 'α'), (0, 'β'), (1, 'α'), (1, 'β')]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">cartesian_product</span><span class="op"><</span><span class="ident">J</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">J</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Product</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">J::IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">Clone</span>,
<span class="ident">J</span>: <span class="ident">IntoIterator</span>,
<span class="ident">J::IntoIter</span>: <span class="ident">Clone</span>
{
<span class="ident">adaptors::cartesian_product</span>(<span class="self">self</span>, <span class="ident">other</span>.<span class="ident">into_iter</span>())
}
<span class="doccomment">/// Return an iterator adaptor that iterates over the cartesian product of</span>
<span class="doccomment">/// all subiterators returned by meta-iterator `self`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// All provided iterators must yield the same `Item` type. To generate</span>
<span class="doccomment">/// the product of iterators yielding multiple types, use the</span>
<span class="doccomment">/// [`iproduct`](macro.iproduct.html) macro instead.</span>
<span class="doccomment">///</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The iterator element type is `Vec<T>`, where `T` is the iterator element</span>
<span class="doccomment">/// of the subiterators.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">/// let mut multi_prod = (0..3).map(|i| (i * 2)..(i * 2 + 2))</span>
<span class="doccomment">/// .multi_cartesian_product();</span>
<span class="doccomment">/// assert_eq!(multi_prod.next(), Some(vec![0, 2, 4]));</span>
<span class="doccomment">/// assert_eq!(multi_prod.next(), Some(vec![0, 2, 5]));</span>
<span class="doccomment">/// assert_eq!(multi_prod.next(), Some(vec![0, 3, 4]));</span>
<span class="doccomment">/// assert_eq!(multi_prod.next(), Some(vec![0, 3, 5]));</span>
<span class="doccomment">/// assert_eq!(multi_prod.next(), Some(vec![1, 2, 4]));</span>
<span class="doccomment">/// assert_eq!(multi_prod.next(), Some(vec![1, 2, 5]));</span>
<span class="doccomment">/// assert_eq!(multi_prod.next(), Some(vec![1, 3, 4]));</span>
<span class="doccomment">/// assert_eq!(multi_prod.next(), Some(vec![1, 3, 5]));</span>
<span class="doccomment">/// assert_eq!(multi_prod.next(), None);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">multi_cartesian_product</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">MultiProduct</span><span class="op"><</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">></span><span class="ident">::IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Iterator</span> <span class="op">+</span> <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">IntoIterator</span>,
<span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">></span><span class="ident">::IntoIter</span>: <span class="ident">Clone</span>,
<span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">></span><span class="ident">::Item</span>: <span class="ident">Clone</span>
{
<span class="ident">adaptors::multi_cartesian_product</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return an iterator adaptor that uses the passed-in closure to</span>
<span class="doccomment">/// optionally merge together consecutive elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The closure `f` is passed two elements, `previous` and `current` and may</span>
<span class="doccomment">/// return either (1) `Ok(combined)` to merge the two values or</span>
<span class="doccomment">/// (2) `Err((previous', current'))` to indicate they can't be merged.</span>
<span class="doccomment">/// In (2), the value `previous'` is emitted by the iterator.</span>
<span class="doccomment">/// Either (1) `combined` or (2) `current'` becomes the previous value</span>
<span class="doccomment">/// when coalesce continues with the next pair of elements to merge. The</span>
<span class="doccomment">/// value that remains at the end is also emitted by the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator is *fused*.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // sum same-sign runs together</span>
<span class="doccomment">/// let data = vec![-1., -2., -3., 3., 1., 0., -1.];</span>
<span class="doccomment">/// itertools::assert_equal(data.into_iter().coalesce(|x, y|</span>
<span class="doccomment">/// if (x >= 0.) == (y >= 0.) {</span>
<span class="doccomment">/// Ok(x + y)</span>
<span class="doccomment">/// } else {</span>
<span class="doccomment">/// Err((x, y))</span>
<span class="doccomment">/// }),</span>
<span class="doccomment">/// vec![-6., 4., -1.]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">coalesce</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Coalesce</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="self">Self</span><span class="ident">::Item</span>, <span class="self">Self</span><span class="ident">::Item</span>)
<span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span>, (<span class="self">Self</span><span class="ident">::Item</span>, <span class="self">Self</span><span class="ident">::Item</span>)<span class="op">></span>
{
<span class="ident">adaptors::coalesce</span>(<span class="self">self</span>, <span class="ident">f</span>)
}
<span class="doccomment">/// Remove duplicates from sections of consecutive identical elements.</span>
<span class="doccomment">/// If the iterator is sorted, all elements will be unique.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator is *fused*.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = vec![1., 1., 2., 3., 3., 2., 2.];</span>
<span class="doccomment">/// itertools::assert_equal(data.into_iter().dedup(),</span>
<span class="doccomment">/// vec![1., 2., 3., 2.]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">dedup</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Dedup</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">PartialEq</span>,
{
<span class="ident">adaptors::dedup</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return an iterator adaptor that filters out elements that have</span>
<span class="doccomment">/// already been produced once during the iteration. Duplicates</span>
<span class="doccomment">/// are detected using hash and equality.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Clones of visited elements are stored in a hash set in the</span>
<span class="doccomment">/// iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = vec![10, 20, 30, 20, 40, 10, 50];</span>
<span class="doccomment">/// itertools::assert_equal(data.into_iter().unique(),</span>
<span class="doccomment">/// vec![10, 20, 30, 40, 50]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">unique</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Unique</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>
{
<span class="ident">unique_impl::unique</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return an iterator adaptor that filters out elements that have</span>
<span class="doccomment">/// already been produced once during the iteration.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Duplicates are detected by comparing the key they map to</span>
<span class="doccomment">/// with the keying function `f` by hash and equality.</span>
<span class="doccomment">/// The keys are stored in a hash set in the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = vec!["a", "bb", "aa", "c", "ccc"];</span>
<span class="doccomment">/// itertools::assert_equal(data.into_iter().unique_by(|s| s.len()),</span>
<span class="doccomment">/// vec!["a", "bb", "ccc"]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">unique_by</span><span class="op"><</span><span class="ident">V</span>, <span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">UniqueBy</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">V</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">V</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">V</span>
{
<span class="ident">unique_impl::unique_by</span>(<span class="self">self</span>, <span class="ident">f</span>)
}
<span class="doccomment">/// Return an iterator adaptor that borrows from this iterator and</span>
<span class="doccomment">/// takes items while the closure `accept` returns `true`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This adaptor can only be used on iterators that implement `PeekingNext`</span>
<span class="doccomment">/// like `.peekable()`, `put_back` and a few other collection iterators.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The last and rejected element (first `false`) is still available when</span>
<span class="doccomment">/// `peeking_take_while` is done.</span>
<span class="doccomment">///</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See also [`.take_while_ref()`](#method.take_while_ref)</span>
<span class="doccomment">/// which is a similar adaptor.</span>
<span class="kw">fn</span> <span class="ident">peeking_take_while</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">accept</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">PeekingTakeWhile</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">PeekingNext</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span>,
{
<span class="ident">peeking_take_while::peeking_take_while</span>(<span class="self">self</span>, <span class="ident">accept</span>)
}
<span class="doccomment">/// Return an iterator adaptor that borrows from a `Clone`-able iterator</span>
<span class="doccomment">/// to only pick off elements while the predicate `accept` returns `true`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It uses the `Clone` trait to restore the original iterator so that the</span>
<span class="doccomment">/// last and rejected element (first `false`) is still available when</span>
<span class="doccomment">/// `take_while_ref` is done.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut hexadecimals = "0123456789abcdef".chars();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let decimals = hexadecimals.take_while_ref(|c| c.is_numeric())</span>
<span class="doccomment">/// .collect::<String>();</span>
<span class="doccomment">/// assert_eq!(decimals, "0123456789");</span>
<span class="doccomment">/// assert_eq!(hexadecimals.next(), Some('a'));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">take_while_ref</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">accept</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TakeWhileRef</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Clone</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span>
{
<span class="ident">adaptors::take_while_ref</span>(<span class="self">self</span>, <span class="ident">accept</span>)
}
<span class="doccomment">/// Return an iterator adaptor that filters `Option<A>` iterator elements</span>
<span class="doccomment">/// and produces `A`. Stops on the first `None` encountered.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `A`, the unwrapped element.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // List all hexadecimal digits</span>
<span class="doccomment">/// itertools::assert_equal(</span>
<span class="doccomment">/// (0..).map(|i| std::char::from_digit(i, 16)).while_some(),</span>
<span class="doccomment">/// "0123456789abcdef".chars());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">while_some</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">WhileSome</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></span>
{
<span class="ident">adaptors::while_some</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return an iterator adaptor that iterates over the combinations of the</span>
<span class="doccomment">/// elements from an iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element can be any homogeneous tuple of type `Self::Item` with</span>
<span class="doccomment">/// size up to 4.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut v = Vec::new();</span>
<span class="doccomment">/// for (a, b) in (1..5).tuple_combinations() {</span>
<span class="doccomment">/// v.push((a, b));</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(v, vec![(1, 2), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut it = (1..5).tuple_combinations();</span>
<span class="doccomment">/// assert_eq!(Some((1, 2, 3)), it.next());</span>
<span class="doccomment">/// assert_eq!(Some((1, 2, 4)), it.next());</span>
<span class="doccomment">/// assert_eq!(Some((1, 3, 4)), it.next());</span>
<span class="doccomment">/// assert_eq!(Some((2, 3, 4)), it.next());</span>
<span class="doccomment">/// assert_eq!(None, it.next());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // this requires a type hint</span>
<span class="doccomment">/// let it = (1..5).tuple_combinations::<(_, _, _)>();</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![(1, 2, 3), (1, 2, 4), (1, 3, 4), (2, 3, 4)]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // you can also specify the complete type</span>
<span class="doccomment">/// use itertools::TupleCombinations;</span>
<span class="doccomment">/// use std::ops::Range;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it: TupleCombinations<Range<u32>, (u32, u32, u32)> = (1..5).tuple_combinations();</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![(1, 2, 3), (1, 2, 4), (1, 3, 4), (2, 3, 4)]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">tuple_combinations</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TupleCombinations</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Clone</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">Clone</span>,
<span class="ident">T</span>: <span class="ident">adaptors::HasCombination</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>,
{
<span class="ident">adaptors::tuple_combinations</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return an iterator adaptor that iterates over the `n`-length combinations of</span>
<span class="doccomment">/// the elements from an iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Vec<Self::Item>`. The iterator produces a new Vec per iteration,</span>
<span class="doccomment">/// and clones the iterator elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it = (1..5).combinations(3);</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![</span>
<span class="doccomment">/// vec![1, 2, 3],</span>
<span class="doccomment">/// vec![1, 2, 4],</span>
<span class="doccomment">/// vec![1, 3, 4],</span>
<span class="doccomment">/// vec![2, 3, 4],</span>
<span class="doccomment">/// ]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">combinations</span>(<span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Combinations</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">Clone</span>
{
<span class="ident">combinations::combinations</span>(<span class="self">self</span>, <span class="ident">n</span>)
}
<span class="doccomment">/// Return an iterator adaptor that pads the sequence to a minimum length of</span>
<span class="doccomment">/// `min` by filling missing elements using a closure `f`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `Self::Item`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it = (0..5).pad_using(10, |i| 2*i);</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![0, 1, 2, 3, 4, 10, 12, 14, 16, 18]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it = (0..10).pad_using(5, |i| 2*i);</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it = (0..5).pad_using(10, |i| 2*i).rev();</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![18, 16, 14, 12, 10, 4, 3, 2, 1, 0]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">pad_using</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">min</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">PadUsing</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span><span class="ident">::Item</span>
{
<span class="ident">pad_tail::pad_using</span>(<span class="self">self</span>, <span class="ident">min</span>, <span class="ident">f</span>)
}
<span class="doccomment">/// Flatten an iterator of iterables into a single combined sequence of all</span>
<span class="doccomment">/// the elements in the iterables.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is more or less equivalent to `.flat_map` with an identity</span>
<span class="doccomment">/// function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See also the [`flatten`](fn.flatten.html) function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```ignore</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = vec![vec![1, 2, 3], vec![4, 5, 6]];</span>
<span class="doccomment">/// let flattened = data.iter().flatten();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// itertools::assert_equal(flattened, &[1, 2, 3, 4, 5, 6]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">flatten</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Flatten</span><span class="op"><</span><span class="self">Self</span>, <span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">></span><span class="ident">::IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">IntoIterator</span>
{
<span class="ident">adaptors::flatten</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return an iterator adaptor that wraps each element in a `Position` to</span>
<span class="doccomment">/// ease special-case handling of the first or last elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is</span>
<span class="doccomment">/// [`Position<Self::Item>`](enum.Position.html)</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::{Itertools, Position};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it = (0..4).with_position();</span>
<span class="doccomment">/// itertools::assert_equal(it,</span>
<span class="doccomment">/// vec![Position::First(0),</span>
<span class="doccomment">/// Position::Middle(1),</span>
<span class="doccomment">/// Position::Middle(2),</span>
<span class="doccomment">/// Position::Last(3)]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let it = (0..1).with_position();</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![Position::Only(0)]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">with_position</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">WithPosition</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
{
<span class="ident">with_position::with_position</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return an iterator adaptor that yields the indices of all elements</span>
<span class="doccomment">/// satisfying a predicate, counted from the start of the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Equivalent to `iter.enumerate().filter(|(_, v)| predicate(v)).map(|(i, _)| i)`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = vec![1, 2, 3, 3, 4, 6, 7, 9];</span>
<span class="doccomment">/// itertools::assert_equal(data.iter().positions(|v| v % 2 == 0), vec![1, 4, 5]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// itertools::assert_equal(data.iter().positions(|v| v % 2 == 1).rev(), vec![7, 6, 3, 2, 0]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">positions</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">predicate</span>: <span class="ident">P</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Positions</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">P</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span>,
{
<span class="ident">adaptors::positions</span>(<span class="self">self</span>, <span class="ident">predicate</span>)
}
<span class="doccomment">/// Return an iterator adaptor that applies a mutating function</span>
<span class="doccomment">/// to each element before yielding it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let input = vec![vec![1], vec![3, 2, 1]];</span>
<span class="doccomment">/// let it = input.into_iter().update(|mut v| v.push(0));</span>
<span class="doccomment">/// itertools::assert_equal(it, vec![vec![1, 0], vec![3, 2, 1, 0]]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">update</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">updater</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Update</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span><span class="ident">::Item</span>),
{
<span class="ident">adaptors::update</span>(<span class="self">self</span>, <span class="ident">updater</span>)
}
<span class="comment">// non-adaptor methods</span>
<span class="doccomment">/// Advances the iterator and returns the next items grouped in a tuple of</span>
<span class="doccomment">/// a specific size (up to 4).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If there are enough elements to be grouped in a tuple, then the tuple is</span>
<span class="doccomment">/// returned inside `Some`, otherwise `None` is returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut iter = 1..5;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Some((1, 2)), iter.next_tuple());</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">next_tuple</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T::Item</span><span class="op">></span>,
<span class="ident">T</span>: <span class="ident">tuple_impl::TupleCollect</span>
{
<span class="ident">T::collect_from_iter_no_buf</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Collects all items from the iterator into a tuple of a specific size</span>
<span class="doccomment">/// (up to 4).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the number of elements inside the iterator is **exactly** equal to</span>
<span class="doccomment">/// the tuple size, then the tuple is returned inside `Some`, otherwise</span>
<span class="doccomment">/// `None` is returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let iter = 1..3;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// if let Some((x, y)) = iter.collect_tuple() {</span>
<span class="doccomment">/// assert_eq!((x, y), (1, 2))</span>
<span class="doccomment">/// } else {</span>
<span class="doccomment">/// panic!("Expected two elements")</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">collect_tuple</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T::Item</span><span class="op">></span>,
<span class="ident">T</span>: <span class="ident">tuple_impl::TupleCollect</span>
{
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">next_tuple</span>() {
<span class="ident">elt</span> @ <span class="prelude-val">Some</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">next</span>() {
<span class="prelude-val">Some</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="ident">elt</span>,
},
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>
}
}
<span class="doccomment">/// Find the position and value of the first element satisfying a predicate.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The iterator is not advanced past the first element found.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let text = "Hα";</span>
<span class="doccomment">/// assert_eq!(text.chars().find_position(|ch| ch.is_lowercase()), Some((1, 'α')));</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">find_position</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="self">Self</span><span class="ident">::Item</span>)<span class="op">></span>
<span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">index</span> <span class="op">=</span> <span class="number">0usize</span>;
<span class="kw">for</span> <span class="ident">elt</span> <span class="kw">in</span> <span class="self">self</span> {
<span class="kw">if</span> <span class="ident">pred</span>(<span class="kw-2">&</span><span class="ident">elt</span>) {
<span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">index</span>, <span class="ident">elt</span>));
}
<span class="ident">index</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="prelude-val">None</span>
}
<span class="doccomment">/// Check whether all elements compare equal.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Empty iterators are considered to have equal elements:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = vec![1, 1, 1, 2, 2, 3, 3, 3, 4, 5, 5];</span>
<span class="doccomment">/// assert!(!data.iter().all_equal());</span>
<span class="doccomment">/// assert!(data[0..3].iter().all_equal());</span>
<span class="doccomment">/// assert!(data[3..5].iter().all_equal());</span>
<span class="doccomment">/// assert!(data[5..8].iter().all_equal());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data : Option<usize> = None;</span>
<span class="doccomment">/// assert!(data.into_iter().all_equal());</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">all_equal</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span>
<span class="kw">where</span> <span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">PartialEq</span>,
{
<span class="self">self</span>.<span class="ident">dedup</span>().<span class="ident">nth</span>(<span class="number">1</span>).<span class="ident">is_none</span>()
}
<span class="doccomment">/// Consume the first `n` elements from the iterator eagerly,</span>
<span class="doccomment">/// and return the same iterator again.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It works similarly to *.skip(* `n` *)* except it is eager and</span>
<span class="doccomment">/// preserves the iterator type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut iter = "αβγ".chars().dropping(2);</span>
<span class="doccomment">/// itertools::assert_equal(iter, "γ".chars());</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// *Fusing notes: if the iterator is exhausted by dropping,</span>
<span class="doccomment">/// the result of calling `.next()` again depends on the iterator implementation.*</span>
<span class="kw">fn</span> <span class="ident">dropping</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>
{
<span class="kw">if</span> <span class="ident">n</span> <span class="op">></span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">nth</span>(<span class="ident">n</span> <span class="op">-</span> <span class="number">1</span>);
}
<span class="self">self</span>
}
<span class="doccomment">/// Consume the last `n` elements from the iterator eagerly,</span>
<span class="doccomment">/// and return the same iterator again.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is only possible on double ended iterators. `n` may be</span>
<span class="doccomment">/// larger than the number of elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note: This method is eager, dropping the back elements immediately and</span>
<span class="doccomment">/// preserves the iterator type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let init = vec![0, 3, 6, 9].into_iter().dropping_back(1);</span>
<span class="doccomment">/// itertools::assert_equal(init, vec![0, 3, 6]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">dropping_back</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span>: <span class="ident">DoubleEndedIterator</span>
{
<span class="kw">if</span> <span class="ident">n</span> <span class="op">></span> <span class="number">0</span> {
(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>).<span class="ident">rev</span>().<span class="ident">nth</span>(<span class="ident">n</span> <span class="op">-</span> <span class="number">1</span>);
}
<span class="self">self</span>
}
<span class="doccomment">/// Run the closure `f` eagerly on each element of the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Consumes the iterator until its end.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (tx, rx) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // use .foreach() to apply a function to each value -- sending it</span>
<span class="doccomment">/// (0..5).map(|x| x * 2 + 1).foreach(|x| { tx.send(x).unwrap(); } );</span>
<span class="doccomment">///</span>
<span class="doccomment">/// drop(tx);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// itertools::assert_equal(rx.iter(), vec![1, 3, 5, 7, 9]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">foreach</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>)
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="self">Self</span><span class="ident">::Item</span>),
<span class="self">Self</span>: <span class="ident">Sized</span>,
{
<span class="self">self</span>.<span class="ident">fold</span>((), <span class="kw">move</span> <span class="op">|</span>(), <span class="ident">element</span><span class="op">|</span> <span class="ident">f</span>(<span class="ident">element</span>))
}
<span class="doccomment">/// Combine all an iterator's elements into one element by using `Extend`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This combinator will extend the first item with each of the rest of the</span>
<span class="doccomment">/// items of the iterator. If the iterator is empty, the default value of</span>
<span class="doccomment">/// `I::Item` is returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let input = vec![vec![1], vec![2, 3], vec![4, 5, 6]];</span>
<span class="doccomment">/// assert_eq!(input.into_iter().concat(),</span>
<span class="doccomment">/// vec![1, 2, 3, 4, 5, 6]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">concat</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span><span class="ident">::Item</span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">Extend</span><span class="op"><</span><span class="op"><</span><span class="op"><</span><span class="self">Self</span> <span class="kw">as</span> <span class="ident">Iterator</span><span class="op">></span><span class="ident">::Item</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">></span><span class="ident">::Item</span><span class="op">></span> <span class="op">+</span> <span class="ident">IntoIterator</span> <span class="op">+</span> <span class="ident">Default</span>
{
<span class="ident">concat</span>(<span class="self">self</span>)
}
<span class="doccomment">/// `.collect_vec()` is simply a type specialization of `.collect()`,</span>
<span class="doccomment">/// for convenience.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">collect_vec</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>
{
<span class="self">self</span>.<span class="ident">collect</span>()
}
<span class="doccomment">/// Assign to each reference in `self` from the `from` iterator,</span>
<span class="doccomment">/// stopping at the shortest of the two iterators.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `from` iterator is queried for its next element before the `self`</span>
<span class="doccomment">/// iterator, and if either is exhausted the method is done.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Return the number of elements written.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut xs = [0; 4];</span>
<span class="doccomment">/// xs.iter_mut().set_from(1..);</span>
<span class="doccomment">/// assert_eq!(xs, [1, 2, 3, 4]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">set_from</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span>: <span class="lifetime">'a</span>, <span class="ident">J</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">from</span>: <span class="ident">J</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">A</span><span class="op">></span>,
<span class="ident">J</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">A</span><span class="op">></span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">count</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> <span class="ident">elt</span> <span class="kw">in</span> <span class="ident">from</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">next</span>() {
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">break</span>,
<span class="prelude-val">Some</span>(<span class="ident">ptr</span>) <span class="op">=</span><span class="op">></span> <span class="kw-2">*</span><span class="ident">ptr</span> <span class="op">=</span> <span class="ident">elt</span>,
}
<span class="ident">count</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="ident">count</span>
}
<span class="doccomment">/// Combine all iterator elements into one String, seperated by `sep`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Use the `Display` implementation of each element.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(["a", "b", "c"].iter().join(", "), "a, b, c");</span>
<span class="doccomment">/// assert_eq!([1, 2, 3].iter().join(", "), "1, 2, 3");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">join</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">sep</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span>
<span class="kw">where</span> <span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">std::fmt::Display</span>
{
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">next</span>() {
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="ident">String::new</span>(),
<span class="prelude-val">Some</span>(<span class="ident">first_elt</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// estimate lower bound of capacity needed</span>
<span class="kw">let</span> (<span class="ident">lower</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">size_hint</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">String::with_capacity</span>(<span class="ident">sep</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="ident">lower</span>);
<span class="macro">write!</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">result</span>, <span class="string">"{}"</span>, <span class="ident">first_elt</span>).<span class="ident">unwrap</span>();
<span class="kw">for</span> <span class="ident">elt</span> <span class="kw">in</span> <span class="self">self</span> {
<span class="ident">result</span>.<span class="ident">push_str</span>(<span class="ident">sep</span>);
<span class="macro">write!</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">result</span>, <span class="string">"{}"</span>, <span class="ident">elt</span>).<span class="ident">unwrap</span>();
}
<span class="ident">result</span>
}
}
}
<span class="doccomment">/// Format all iterator elements, separated by `sep`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// All elements are formatted (any formatting trait)</span>
<span class="doccomment">/// with `sep` inserted between each element.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if the formatter helper is formatted more than once.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = [1.1, 2.71828, -3.];</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// format!("{:.2}", data.iter().format(", ")),</span>
<span class="doccomment">/// "1.10, 2.72, -3.00");</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">format</span>(<span class="self">self</span>, <span class="ident">sep</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Format</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
{
<span class="ident">format::new_format_default</span>(<span class="self">self</span>, <span class="ident">sep</span>)
}
<span class="doccomment">/// Format all iterator elements, separated by `sep`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is a customizable version of `.format()`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The supplied closure `format` is called once per iterator element,</span>
<span class="doccomment">/// with two arguments: the element and a callback that takes a</span>
<span class="doccomment">/// `&Display` value, i.e. any reference to type that implements `Display`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `&format_args!(...)` is the most versatile way to apply custom</span>
<span class="doccomment">/// element formatting. The callback can be called multiple times if needed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if the formatter helper is formatted more than once.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = [1.1, 2.71828, -3.];</span>
<span class="doccomment">/// let data_formatter = data.iter().format_with(", ", |elt, f| f(&format_args!("{:.2}", elt)));</span>
<span class="doccomment">/// assert_eq!(format!("{}", data_formatter),</span>
<span class="doccomment">/// "1.10, 2.72, -3.00");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // .format_with() is recursively composable</span>
<span class="doccomment">/// let matrix = [[1., 2., 3.],</span>
<span class="doccomment">/// [4., 5., 6.]];</span>
<span class="doccomment">/// let matrix_formatter = matrix.iter().format_with("\n", |row, f| {</span>
<span class="doccomment">/// f(&row.iter().format_with(", ", |elt, g| g(&elt)))</span>
<span class="doccomment">/// });</span>
<span class="doccomment">/// assert_eq!(format!("{}", matrix_formatter),</span>
<span class="doccomment">/// "1, 2, 3\n4, 5, 6");</span>
<span class="doccomment">///</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">format_with</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">sep</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">format</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">FormatWith</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="self">Self</span><span class="ident">::Item</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">fmt::Display</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span>,
{
<span class="ident">format::new_format</span>(<span class="self">self</span>, <span class="ident">sep</span>, <span class="ident">format</span>)
}
<span class="doccomment">/// Fold `Result` values from an iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Only `Ok` values are folded. If no error is encountered, the folded</span>
<span class="doccomment">/// value is returned inside `Ok`. Otherwise, the operation terminates</span>
<span class="doccomment">/// and returns the first `Err` value it encounters. No iterator elements are</span>
<span class="doccomment">/// consumed after the first error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The first accumulator value is the `start` parameter.</span>
<span class="doccomment">/// Each iteration passes the accumulator value and the next value inside `Ok`</span>
<span class="doccomment">/// to the fold function `f` and its return value becomes the new accumulator value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For example the sequence *Ok(1), Ok(2), Ok(3)* will result in a</span>
<span class="doccomment">/// computation like this:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```ignore</span>
<span class="doccomment">/// let mut accum = start;</span>
<span class="doccomment">/// accum = f(accum, 1);</span>
<span class="doccomment">/// accum = f(accum, 2);</span>
<span class="doccomment">/// accum = f(accum, 3);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// With a `start` value of 0 and an addition as folding function,</span>
<span class="doccomment">/// this effetively results in *((0 + 1) + 2) + 3*</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ops::Add;</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let values = [1, 2, -2, -1, 2, 1];</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// values.iter()</span>
<span class="doccomment">/// .map(Ok::<_, ()>)</span>
<span class="doccomment">/// .fold_results(0, Add::add),</span>
<span class="doccomment">/// Ok(3)</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// assert!(</span>
<span class="doccomment">/// values.iter()</span>
<span class="doccomment">/// .map(|&x| if x >= 0 { Ok(x) } else { Err("Negative number") })</span>
<span class="doccomment">/// .fold_results(0, Add::add)</span>
<span class="doccomment">/// .is_err()</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">fold_results</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">E</span>, <span class="ident">B</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">start</span>: <span class="ident">B</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">B</span>, <span class="ident">E</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">E</span><span class="op">></span><span class="op">></span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">B</span>, <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> <span class="ident">B</span>
{
<span class="kw">for</span> <span class="ident">elt</span> <span class="kw">in</span> <span class="self">self</span> {
<span class="kw">match</span> <span class="ident">elt</span> {
<span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">start</span>, <span class="ident">v</span>),
<span class="prelude-val">Err</span>(<span class="ident">u</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">u</span>),
}
}
<span class="prelude-val">Ok</span>(<span class="ident">start</span>)
}
<span class="doccomment">/// Fold `Option` values from an iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Only `Some` values are folded. If no `None` is encountered, the folded</span>
<span class="doccomment">/// value is returned inside `Some`. Otherwise, the operation terminates</span>
<span class="doccomment">/// and returns `None`. No iterator elements are consumed after the `None`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is the `Option` equivalent to `fold_results`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ops::Add;</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut values = vec![Some(1), Some(2), Some(-2)].into_iter();</span>
<span class="doccomment">/// assert_eq!(values.fold_options(5, Add::add), Some(5 + 1 + 2 - 2));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut more_values = vec![Some(2), None, Some(0)].into_iter();</span>
<span class="doccomment">/// assert!(more_values.fold_options(0, Add::add).is_none());</span>
<span class="doccomment">/// assert_eq!(more_values.next().unwrap(), Some(0));</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">fold_options</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">start</span>: <span class="ident">B</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">B</span>, <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> <span class="ident">B</span>
{
<span class="kw">for</span> <span class="ident">elt</span> <span class="kw">in</span> <span class="self">self</span> {
<span class="kw">match</span> <span class="ident">elt</span> {
<span class="prelude-val">Some</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">start</span>, <span class="ident">v</span>),
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">None</span>,
}
}
<span class="prelude-val">Some</span>(<span class="ident">start</span>)
}
<span class="doccomment">/// Accumulator of the elements in the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Like `.fold()`, without a base case. If the iterator is</span>
<span class="doccomment">/// empty, return `None`. With just one element, return it.</span>
<span class="doccomment">/// Otherwise elements are accumulated in sequence using the closure `f`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!((0..10).fold1(|x, y| x + y).unwrap_or(0), 45);</span>
<span class="doccomment">/// assert_eq!((0..0).fold1(|x, y| x * y), None);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">fold1</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="self">Self</span><span class="ident">::Item</span>, <span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span><span class="ident">::Item</span>,
<span class="self">Self</span>: <span class="ident">Sized</span>,
{
<span class="self">self</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="kw">move</span> <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">fold</span>(<span class="ident">x</span>, <span class="ident">f</span>))
}
<span class="doccomment">/// Accumulate the elements in the iterator in a tree-like manner.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// You can think of it as, while there's more than one item, repeatedly</span>
<span class="doccomment">/// combining adjacent items. It does so in bottom-up-merge-sort order,</span>
<span class="doccomment">/// however, so that it needs only logarithmic stack space.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This produces a call tree like the following (where the calls under</span>
<span class="doccomment">/// an item are done after reading that item):</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```text</span>
<span class="doccomment">/// 1 2 3 4 5 6 7</span>
<span class="doccomment">/// │ │ │ │ │ │ │</span>
<span class="doccomment">/// └─f └─f └─f │</span>
<span class="doccomment">/// │ │ │ │</span>
<span class="doccomment">/// └───f └─f</span>
<span class="doccomment">/// │ │</span>
<span class="doccomment">/// └─────f</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Which, for non-associative functions, will typically produce a different</span>
<span class="doccomment">/// result than the linear call tree used by `fold1`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```text</span>
<span class="doccomment">/// 1 2 3 4 5 6 7</span>
<span class="doccomment">/// │ │ │ │ │ │ │</span>
<span class="doccomment">/// └─f─f─f─f─f─f</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If `f` is associative, prefer the normal `fold1` instead.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // The same tree as above</span>
<span class="doccomment">/// let num_strings = (1..8).map(|x| x.to_string());</span>
<span class="doccomment">/// assert_eq!(num_strings.tree_fold1(|x, y| format!("f({}, {})", x, y)),</span>
<span class="doccomment">/// Some(String::from("f(f(f(1, 2), f(3, 4)), f(f(5, 6), 7))")));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Like fold1, an empty iterator produces None</span>
<span class="doccomment">/// assert_eq!((0..0).tree_fold1(|x, y| x * y), None);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // tree_fold1 matches fold1 for associative operations...</span>
<span class="doccomment">/// assert_eq!((0..10).tree_fold1(|x, y| x + y),</span>
<span class="doccomment">/// (0..10).fold1(|x, y| x + y));</span>
<span class="doccomment">/// // ...but not for non-associative ones</span>
<span class="doccomment">/// assert!((0..10).tree_fold1(|x, y| x - y)</span>
<span class="doccomment">/// != (0..10).fold1(|x, y| x - y));</span>
<span class="doccomment">/// ```</span>
<span class="comment">// FIXME: If minver changes to >= 1.13, use `assert_ne!` in the doctest.</span>
<span class="kw">fn</span> <span class="ident">tree_fold1</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="self">Self</span><span class="ident">::Item</span>, <span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span><span class="ident">::Item</span>,
<span class="self">Self</span>: <span class="ident">Sized</span>,
{
<span class="kw">type</span> <span class="ident">State</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">inner0</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">II</span>, <span class="ident">FF</span><span class="op">></span>(<span class="ident">it</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">II</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">FF</span>) <span class="op">-</span><span class="op">></span> <span class="ident">State</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">II</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>,
<span class="ident">FF</span>: <span class="ident">FnMut</span>(<span class="ident">T</span>, <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">T</span>
{
<span class="comment">// This function could be replaced with `it.next().ok_or(None)`,</span>
<span class="comment">// but half the useful tree_fold1 work is combining adjacent items,</span>
<span class="comment">// so put that in a form that LLVM is more likely to optimize well.</span>
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">v</span>) <span class="op">=</span> <span class="ident">it</span>.<span class="ident">next</span>() { <span class="ident">v</span> }
<span class="kw">else</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="prelude-val">None</span>) };
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">v</span>) <span class="op">=</span> <span class="ident">it</span>.<span class="ident">next</span>() { <span class="ident">v</span> }
<span class="kw">else</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="prelude-val">Some</span>(<span class="ident">a</span>)) };
<span class="prelude-val">Ok</span>(<span class="ident">f</span>(<span class="ident">a</span>, <span class="ident">b</span>))
}
<span class="kw">fn</span> <span class="ident">inner</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">II</span>, <span class="ident">FF</span><span class="op">></span>(<span class="ident">stop</span>: <span class="ident">usize</span>, <span class="ident">it</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">II</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">FF</span>) <span class="op">-</span><span class="op">></span> <span class="ident">State</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">II</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>,
<span class="ident">FF</span>: <span class="ident">FnMut</span>(<span class="ident">T</span>, <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">T</span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x</span> <span class="op">=</span> <span class="macro">try!</span>(<span class="ident">inner0</span>(<span class="ident">it</span>, <span class="ident">f</span>));
<span class="kw">for</span> <span class="ident">height</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stop</span> {
<span class="comment">// Try to get another tree the same size with which to combine it,</span>
<span class="comment">// creating a new tree that's twice as big for next time around.</span>
<span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span>
<span class="kw">if</span> <span class="ident">height</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="ident">inner0</span>(<span class="ident">it</span>, <span class="ident">f</span>)
} <span class="kw">else</span> {
<span class="ident">inner</span>(<span class="ident">height</span>, <span class="ident">it</span>, <span class="ident">f</span>)
};
<span class="kw">match</span> <span class="ident">next</span> {
<span class="prelude-val">Ok</span>(<span class="ident">y</span>) <span class="op">=</span><span class="op">></span> <span class="ident">x</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">x</span>, <span class="ident">y</span>),
<span class="comment">// If we ran out of items, combine whatever we did manage</span>
<span class="comment">// to get. It's better combined with the current value</span>
<span class="comment">// than something in a parent frame, because the tree in</span>
<span class="comment">// the parent is always as least as big as this one.</span>
<span class="prelude-val">Err</span>(<span class="prelude-val">None</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="prelude-val">Some</span>(<span class="ident">x</span>)),
<span class="prelude-val">Err</span>(<span class="prelude-val">Some</span>(<span class="ident">y</span>)) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="prelude-val">Some</span>(<span class="ident">f</span>(<span class="ident">x</span>, <span class="ident">y</span>))),
}
}
<span class="prelude-val">Ok</span>(<span class="ident">x</span>)
}
<span class="kw">match</span> <span class="ident">inner</span>(<span class="ident">usize::max_value</span>(), <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">f</span>) {
<span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=</span><span class="op">></span> <span class="ident">x</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">unreachable!</span>(),
}
}
<span class="doccomment">/// An iterator method that applies a function, producing a single, final value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `fold_while()` is basically equivalent to `fold()` but with additional support for</span>
<span class="doccomment">/// early exit via short-circuiting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">/// use itertools::FoldWhile::{Continue, Done};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut result = 0;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // for loop:</span>
<span class="doccomment">/// for i in &numbers {</span>
<span class="doccomment">/// if *i > 5 {</span>
<span class="doccomment">/// break;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// result = result + i;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // fold:</span>
<span class="doccomment">/// let result2 = numbers.iter().fold(0, |acc, x| {</span>
<span class="doccomment">/// if *x > 5 { acc } else { acc + x }</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // fold_while:</span>
<span class="doccomment">/// let result3 = numbers.iter().fold_while(0, |acc, x| {</span>
<span class="doccomment">/// if *x > 5 { Done(acc) } else { Continue(acc + x) }</span>
<span class="doccomment">/// }).into_inner();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // they're the same</span>
<span class="doccomment">/// assert_eq!(result, result2);</span>
<span class="doccomment">/// assert_eq!(result2, result3);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The big difference between the computations of `result2` and `result3` is that while</span>
<span class="doccomment">/// `fold()` called the provided closure for every item of the callee iterator,</span>
<span class="doccomment">/// `fold_while()` actually stopped iterating as soon as it encountered `Fold::Done(_)`.</span>
<span class="kw">fn</span> <span class="ident">fold_while</span><span class="op"><</span><span class="ident">B</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">init</span>: <span class="ident">B</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">FoldWhile</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">B</span>, <span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">FoldWhile</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">acc</span> <span class="op">=</span> <span class="ident">init</span>;
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">item</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">next</span>() {
<span class="kw">match</span> <span class="ident">f</span>(<span class="ident">acc</span>, <span class="ident">item</span>) {
<span class="ident">FoldWhile::Continue</span>(<span class="ident">res</span>) <span class="op">=</span><span class="op">></span> <span class="ident">acc</span> <span class="op">=</span> <span class="ident">res</span>,
<span class="ident">res</span> @ <span class="ident">FoldWhile::Done</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="ident">res</span>,
}
}
<span class="ident">FoldWhile::Continue</span>(<span class="ident">acc</span>)
}
<span class="doccomment">/// Collect all iterator elements into a sorted vector in ascending order.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Note:** This consumes the entire iterator, uses the</span>
<span class="doccomment">/// `slice::sort_by()` method and returns the sorted vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // sort the letters of the text in ascending order</span>
<span class="doccomment">/// let text = "bdacfe";</span>
<span class="doccomment">/// itertools::assert_equal(text.chars().sorted(),</span>
<span class="doccomment">/// "abcdef".chars());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">sorted</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">Ord</span>
{
<span class="self">self</span>.<span class="ident">sorted_by</span>(<span class="ident">Ord::cmp</span>)
}
<span class="doccomment">/// Collect all iterator elements into a sorted vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Note:** This consumes the entire iterator, uses the</span>
<span class="doccomment">/// `slice::sort_by()` method and returns the sorted vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // sort people in descending order by age</span>
<span class="doccomment">/// let people = vec![("Jane", 20), ("John", 18), ("Jill", 30), ("Jack", 27)];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let oldest_people_first = people</span>
<span class="doccomment">/// .into_iter()</span>
<span class="doccomment">/// .sorted_by(|a, b| Ord::cmp(&b.1, &a.1))</span>
<span class="doccomment">/// .into_iter()</span>
<span class="doccomment">/// .map(|(person, _age)| person);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// itertools::assert_equal(oldest_people_first,</span>
<span class="doccomment">/// vec!["Jill", "Jack", "Jane", "John"]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">sorted_by</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">cmp</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>, <span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">collect</span>();
<span class="ident">v</span>.<span class="ident">sort_by</span>(<span class="ident">cmp</span>);
<span class="ident">v</span>
}
<span class="doccomment">/// Collect all iterator elements into a sorted vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Note:** This consumes the entire iterator, uses the</span>
<span class="doccomment">/// `slice::sort_by_key()` method and returns the sorted vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // sort people in descending order by age</span>
<span class="doccomment">/// let people = vec![("Jane", 20), ("John", 18), ("Jill", 30), ("Jack", 27)];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let oldest_people_first = people</span>
<span class="doccomment">/// .into_iter()</span>
<span class="doccomment">/// .sorted_by_key(|x| -x.1)</span>
<span class="doccomment">/// .into_iter()</span>
<span class="doccomment">/// .map(|(person, _age)| person);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// itertools::assert_equal(oldest_people_first,</span>
<span class="doccomment">/// vec!["Jill", "Jack", "Jane", "John"]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">sorted_by_key</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">K</span>: <span class="ident">Ord</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">K</span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">collect</span>();
<span class="ident">v</span>.<span class="ident">sort_by_key</span>(<span class="ident">f</span>);
<span class="ident">v</span>
}
<span class="doccomment">/// Collect all iterator elements into one of two</span>
<span class="doccomment">/// partitions. Unlike `Iterator::partition`, each partition may</span>
<span class="doccomment">/// have a distinct type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::{Itertools, Either};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let successes_and_failures = vec![Ok(1), Err(false), Err(true), Ok(2)];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (successes, failures): (Vec<_>, Vec<_>) = successes_and_failures</span>
<span class="doccomment">/// .into_iter()</span>
<span class="doccomment">/// .partition_map(|r| {</span>
<span class="doccomment">/// match r {</span>
<span class="doccomment">/// Ok(v) => Either::Left(v),</span>
<span class="doccomment">/// Err(v) => Either::Right(v),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(successes, [1, 2]);</span>
<span class="doccomment">/// assert_eq!(failures, [false, true]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">partition_map</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">F</span>, <span class="ident">L</span>, <span class="ident">R</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">predicate</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">A</span>, <span class="ident">B</span>)
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>,
<span class="ident">F</span>: <span class="ident">Fn</span>(<span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Either</span><span class="op"><</span><span class="ident">L</span>, <span class="ident">R</span><span class="op">></span>,
<span class="ident">A</span>: <span class="ident">Default</span> <span class="op">+</span> <span class="ident">Extend</span><span class="op"><</span><span class="ident">L</span><span class="op">></span>,
<span class="ident">B</span>: <span class="ident">Default</span> <span class="op">+</span> <span class="ident">Extend</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">left</span> <span class="op">=</span> <span class="ident">A::default</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">right</span> <span class="op">=</span> <span class="ident">B::default</span>();
<span class="kw">for</span> <span class="ident">val</span> <span class="kw">in</span> <span class="self">self</span> {
<span class="kw">match</span> <span class="ident">predicate</span>(<span class="ident">val</span>) {
<span class="ident">Either::Left</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">left</span>.<span class="ident">extend</span>(<span class="prelude-val">Some</span>(<span class="ident">v</span>)),
<span class="ident">Either::Right</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">right</span>.<span class="ident">extend</span>(<span class="prelude-val">Some</span>(<span class="ident">v</span>)),
}
}
(<span class="ident">left</span>, <span class="ident">right</span>)
}
<span class="doccomment">/// Return a `HashMap` of keys mapped to `Vec`s of values. Keys and values</span>
<span class="doccomment">/// are taken from `(Key, Value)` tuple pairs yielded by the input iterator.</span>
<span class="doccomment">/// </span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">/// </span>
<span class="doccomment">/// let data = vec![(0, 10), (2, 12), (3, 13), (0, 20), (3, 33), (2, 42)];</span>
<span class="doccomment">/// let lookup = data.into_iter().into_group_map();</span>
<span class="doccomment">/// </span>
<span class="doccomment">/// assert_eq!(lookup[&0], vec![10, 20]);</span>
<span class="doccomment">/// assert_eq!(lookup.get(&1), None);</span>
<span class="doccomment">/// assert_eq!(lookup[&2], vec![12, 42]);</span>
<span class="doccomment">/// assert_eq!(lookup[&3], vec![13, 33]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">into_group_map</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">HashMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">V</span><span class="op">></span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span>(<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">></span> <span class="op">+</span> <span class="ident">Sized</span>,
<span class="ident">K</span>: <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Eq</span>,
{
<span class="ident">group_map::into_group_map</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return the minimum and maximum elements in the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return type `MinMaxResult` is an enum of three variants:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - `NoElements` if the iterator is empty.</span>
<span class="doccomment">/// - `OneElement(x)` if the iterator has exactly one element.</span>
<span class="doccomment">/// - `MinMax(x, y)` is returned otherwise, where `x <= y`. Two</span>
<span class="doccomment">/// values are equal if and only if there is more than one</span>
<span class="doccomment">/// element in the iterator and all elements are equal.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// On an iterator of length `n`, `minmax` does `1.5 * n` comparisons,</span>
<span class="doccomment">/// and so is faster than calling `min` and `max` separately which does</span>
<span class="doccomment">/// `2 * n` comparisons.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::Itertools;</span>
<span class="doccomment">/// use itertools::MinMaxResult::{NoElements, OneElement, MinMax};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a: [i32; 0] = [];</span>
<span class="doccomment">/// assert_eq!(a.iter().minmax(), NoElements);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = [1];</span>
<span class="doccomment">/// assert_eq!(a.iter().minmax(), OneElement(&1));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = [1, 2, 3, 4, 5];</span>
<span class="doccomment">/// assert_eq!(a.iter().minmax(), MinMax(&1, &5));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = [1, 1, 1, 1];</span>
<span class="doccomment">/// assert_eq!(a.iter().minmax(), MinMax(&1, &1));</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The elements can be floats but no particular result is guaranteed</span>
<span class="doccomment">/// if an element is NaN.</span>
<span class="kw">fn</span> <span class="ident">minmax</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">MinMaxResult</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>, <span class="self">Self</span><span class="ident">::Item</span>: <span class="ident">PartialOrd</span>
{
<span class="ident">minmax::minmax_impl</span>(<span class="self">self</span>, <span class="op">|</span><span class="kw">_</span><span class="op">|</span> (), <span class="op">|</span><span class="ident">x</span>, <span class="ident">y</span>, <span class="kw">_</span>, <span class="kw">_</span><span class="op">|</span> <span class="ident">x</span> <span class="op"><</span> <span class="ident">y</span>)
}
<span class="doccomment">/// Return the minimum and maximum element of an iterator, as determined by</span>
<span class="doccomment">/// the specified function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return value is a variant of `MinMaxResult` like for `minmax()`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For the minimum, the first minimal element is returned. For the maximum,</span>
<span class="doccomment">/// the last maximal element wins. This matches the behavior of the standard</span>
<span class="doccomment">/// `Iterator::min()` and `Iterator::max()` methods.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The keys can be floats but no particular result is guaranteed</span>
<span class="doccomment">/// if a key is NaN.</span>
<span class="kw">fn</span> <span class="ident">minmax_by_key</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">key</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">MinMaxResult</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>, <span class="ident">K</span>: <span class="ident">PartialOrd</span>, <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">K</span>
{
<span class="ident">minmax::minmax_impl</span>(<span class="self">self</span>, <span class="ident">key</span>, <span class="op">|</span><span class="kw">_</span>, <span class="kw">_</span>, <span class="ident">xk</span>, <span class="ident">yk</span><span class="op">|</span> <span class="ident">xk</span> <span class="op"><</span> <span class="ident">yk</span>)
}
<span class="doccomment">/// Return the minimum and maximum element of an iterator, as determined by</span>
<span class="doccomment">/// the specified comparison function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return value is a variant of `MinMaxResult` like for `minmax()`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For the minimum, the first minimal element is returned. For the maximum,</span>
<span class="doccomment">/// the last maximal element wins. This matches the behavior of the standard</span>
<span class="doccomment">/// `Iterator::min()` and `Iterator::max()` methods.</span>
<span class="kw">fn</span> <span class="ident">minmax_by</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">compare</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">MinMaxResult</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>
<span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>, <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>, <span class="kw-2">&</span><span class="self">Self</span><span class="ident">::Item</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span>
{
<span class="ident">minmax::minmax_impl</span>(
<span class="self">self</span>,
<span class="op">|</span><span class="kw">_</span><span class="op">|</span> (),
<span class="op">|</span><span class="ident">x</span>, <span class="ident">y</span>, <span class="kw">_</span>, <span class="kw">_</span><span class="op">|</span> <span class="ident">Ordering::Less</span> <span class="op">=</span><span class="op">=</span> <span class="ident">compare</span>(<span class="ident">x</span>, <span class="ident">y</span>)
)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Itertools</span> <span class="kw">for</span> <span class="ident">T</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Iterator</span> { }
<span class="doccomment">/// Return `true` if both iterables produce equal sequences</span>
<span class="doccomment">/// (elements pairwise equal and sequences of the same length),</span>
<span class="doccomment">/// `false` otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is an `IntoIterator` enabled function that is similar to the standard</span>
<span class="doccomment">/// library method `Iterator::eq`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert!(itertools::equal(vec![1, 2, 3], 1..4));</span>
<span class="doccomment">/// assert!(!itertools::equal(&[0, 0], &[0, 0, 0]));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">equal</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">J</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">I</span>, <span class="ident">b</span>: <span class="ident">J</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span>
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">IntoIterator</span>,
<span class="ident">J</span>: <span class="ident">IntoIterator</span>,
<span class="ident">I::Item</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">J::Item</span><span class="op">></span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ia</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">into_iter</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ib</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">into_iter</span>();
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="ident">ia</span>.<span class="ident">next</span>() {
<span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span><span class="op">></span> <span class="kw">match</span> <span class="ident">ib</span>.<span class="ident">next</span>() {
<span class="prelude-val">Some</span>(<span class="ident">y</span>) <span class="op">=</span><span class="op">></span> <span class="kw">if</span> <span class="ident">x</span> <span class="op">!</span><span class="op">=</span> <span class="ident">y</span> { <span class="kw">return</span> <span class="bool-val">false</span>; },
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="bool-val">false</span>,
},
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="ident">ib</span>.<span class="ident">next</span>().<span class="ident">is_none</span>()
}
}
}
<span class="doccomment">/// Assert that two iterables produce equal sequences, with the same</span>
<span class="doccomment">/// semantics as *equal(a, b)*.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** on assertion failure with a message that shows the</span>
<span class="doccomment">/// two iteration elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```ignore</span>
<span class="doccomment">/// assert_equal("exceed".split('c'), "excess".split('c'));</span>
<span class="doccomment">/// // ^PANIC: panicked at 'Failed assertion Some("eed") == Some("ess") for iteration 1',</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">assert_equal</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">J</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">I</span>, <span class="ident">b</span>: <span class="ident">J</span>)
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">IntoIterator</span>,
<span class="ident">J</span>: <span class="ident">IntoIterator</span>,
<span class="ident">I::Item</span>: <span class="ident">fmt::Debug</span> <span class="op">+</span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">J::Item</span><span class="op">></span>,
<span class="ident">J::Item</span>: <span class="ident">fmt::Debug</span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ia</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">into_iter</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ib</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">into_iter</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">loop</span> {
<span class="kw">match</span> (<span class="ident">ia</span>.<span class="ident">next</span>(), <span class="ident">ib</span>.<span class="ident">next</span>()) {
(<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span>,
(<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">equal</span> <span class="op">=</span> <span class="kw">match</span> (<span class="kw-2">&</span><span class="ident">a</span>, <span class="kw-2">&</span><span class="ident">b</span>) {
(<span class="kw-2">&</span><span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">a</span>), <span class="kw-2">&</span><span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">b</span>)) <span class="op">=</span><span class="op">></span> <span class="ident">a</span> <span class="op">=</span><span class="op">=</span> <span class="ident">b</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="bool-val">false</span>,
};
<span class="macro">assert!</span>(<span class="ident">equal</span>, <span class="string">"Failed assertion {a:?} == {b:?} for iteration {i}"</span>,
<span class="ident">i</span><span class="op">=</span><span class="ident">i</span>, <span class="ident">a</span><span class="op">=</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">=</span><span class="ident">b</span>);
<span class="ident">i</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
}
}
}
<span class="doccomment">/// Partition a sequence using predicate `pred` so that elements</span>
<span class="doccomment">/// that map to `true` are placed before elements which map to `false`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The order within the partitions is arbitrary.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Return the index of the split point.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::partition;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # // use repeated numbers to not promise any ordering</span>
<span class="doccomment">/// let mut data = [7, 1, 1, 7, 1, 1, 7];</span>
<span class="doccomment">/// let split_index = partition(&mut data, |elt| *elt >= 3);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(data, [7, 7, 7, 1, 1, 1, 1]);</span>
<span class="doccomment">/// assert_eq!(split_index, 3);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">partition</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span>: <span class="lifetime">'a</span>, <span class="ident">I</span>, <span class="ident">F</span><span class="op">></span>(<span class="ident">iter</span>: <span class="ident">I</span>, <span class="kw-2">mut</span> <span class="ident">pred</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span>
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">A</span><span class="op">></span>,
<span class="ident">I::IntoIter</span>: <span class="ident">DoubleEndedIterator</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">A</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">split_index</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">iter</span>.<span class="ident">into_iter</span>();
<span class="lifetime">'main</span>: <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">front</span>) <span class="op">=</span> <span class="ident">iter</span>.<span class="ident">next</span>() {
<span class="kw">if</span> <span class="op">!</span><span class="ident">pred</span>(<span class="ident">front</span>) {
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="ident">iter</span>.<span class="ident">next_back</span>() {
<span class="prelude-val">Some</span>(<span class="ident">back</span>) <span class="op">=</span><span class="op">></span> <span class="kw">if</span> <span class="ident">pred</span>(<span class="ident">back</span>) {
<span class="ident">std::mem::swap</span>(<span class="ident">front</span>, <span class="ident">back</span>);
<span class="kw">break</span>;
},
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">break</span> <span class="lifetime">'main</span>,
}
}
}
<span class="ident">split_index</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="ident">split_index</span>
}
<span class="doccomment">/// An enum used for controlling the execution of `.fold_while()`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See [`.fold_while()`](trait.Itertools.html#method.fold_while) for more information.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">FoldWhile</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Continue folding with this value</span>
<span class="ident">Continue</span>(<span class="ident">T</span>),
<span class="doccomment">/// Fold is complete and will return this value</span>
<span class="ident">Done</span>(<span class="ident">T</span>),
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">FoldWhile</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Return the value in the continue or done.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">T</span> {
<span class="kw">match</span> <span class="self">self</span> {
<span class="ident">FoldWhile::Continue</span>(<span class="ident">x</span>) <span class="op">|</span> <span class="ident">FoldWhile::Done</span>(<span class="ident">x</span>) <span class="op">=</span><span class="op">></span> <span class="ident">x</span>,
}
}
<span class="doccomment">/// Return true if `self` is `Done`, false if it is `Continue`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_done</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">FoldWhile::Continue</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="bool-val">false</span>,
<span class="ident">FoldWhile::Done</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="bool-val">true</span>,
}
}
}
</pre></div>
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