| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/itertools-0.10.5/src/ziptuple.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ziptuple.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../itertools/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../itertools/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::size_hint; |
| |
| <span class="doccomment">/// See [`multizip`] for more information. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| #[must_use = <span class="string">"iterator adaptors are lazy and do nothing unless consumed"</span>] |
| </span><span class="kw">pub struct </span>Zip<T> { |
| t: T, |
| } |
| |
| <span class="doccomment">/// An iterator that generalizes *.zip()* and allows running multiple iterators in lockstep. |
| /// |
| /// The iterator `Zip<(I, J, ..., M)>` is formed from a tuple of iterators (or values that |
| /// implement [`IntoIterator`]) and yields elements |
| /// until any of the subiterators yields `None`. |
| /// |
| /// The iterator element type is a tuple like like `(A, B, ..., E)` where `A` to `E` are the |
| /// element types of the subiterator. |
| /// |
| /// **Note:** The result of this macro is a value of a named type (`Zip<(I, J, |
| /// ..)>` of each component iterator `I, J, ...`) if each component iterator is |
| /// nameable. |
| /// |
| /// Prefer [`izip!()`] over `multizip` for the performance benefits of using the |
| /// standard library `.zip()`. Prefer `multizip` if a nameable type is needed. |
| /// |
| /// ``` |
| /// use itertools::multizip; |
| /// |
| /// // iterate over three sequences side-by-side |
| /// let mut results = [0, 0, 0, 0]; |
| /// let inputs = [3, 7, 9, 6]; |
| /// |
| /// for (r, index, input) in multizip((&mut results, 0..10, &inputs)) { |
| /// *r = index * 10 + input; |
| /// } |
| /// |
| /// assert_eq!(results, [0 + 3, 10 + 7, 29, 36]); |
| /// ``` |
| /// [`izip!()`]: crate::izip |
| </span><span class="kw">pub fn </span>multizip<T, U>(t: U) -> Zip<T> |
| <span class="kw">where </span>Zip<T>: From<U>, |
| Zip<T>: Iterator, |
| { |
| Zip::from(t) |
| } |
| |
| <span class="macro">macro_rules! </span>impl_zip_iter { |
| ($(<span class="macro-nonterminal">$B</span>:ident),<span class="kw-2">*</span>) => ( |
| <span class="attribute">#[allow(non_snake_case)] |
| </span><span class="kw">impl</span><$(<span class="macro-nonterminal">$B</span>: IntoIterator),<span class="kw-2">*</span>> From<($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>)> <span class="kw">for </span>Zip<($(<span class="macro-nonterminal">$B::IntoIter</span>,)<span class="kw-2">*</span>)> { |
| <span class="kw">fn </span>from(t: ($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>)) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>) = t; |
| Zip { t: ($(<span class="macro-nonterminal">$B</span>.into_iter(),)<span class="kw-2">*</span>) } |
| } |
| } |
| |
| <span class="attribute">#[allow(non_snake_case)] |
| #[allow(unused_assignments)] |
| </span><span class="kw">impl</span><$(<span class="macro-nonterminal">$B</span>),<span class="kw-2">*</span>> Iterator <span class="kw">for </span>Zip<($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>)> |
| <span class="kw">where |
| </span>$( |
| <span class="macro-nonterminal">$B</span>: Iterator, |
| )* |
| { |
| <span class="kw">type </span>Item = ($(<span class="macro-nonterminal">$B::Item</span>,)<span class="kw-2">*</span>); |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> |
| { |
| <span class="kw">let </span>($(<span class="kw-2">ref mut </span><span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>) = <span class="self">self</span>.t; |
| |
| <span class="comment">// NOTE: Just like iter::Zip, we check the iterators |
| // for None in order. We may finish unevenly (some |
| // iterators gave n + 1 elements, some only n). |
| </span>$( |
| <span class="kw">let </span><span class="macro-nonterminal">$B </span>= <span class="kw">match </span><span class="macro-nonterminal">$B</span>.next() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(elt) => elt |
| }; |
| )* |
| <span class="prelude-val">Some</span>(($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>)) |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) |
| { |
| <span class="kw">let </span>sh = (::std::usize::MAX, <span class="prelude-val">None</span>); |
| <span class="kw">let </span>($(<span class="kw-2">ref </span><span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>) = <span class="self">self</span>.t; |
| $( |
| <span class="kw">let </span>sh = size_hint::min(<span class="macro-nonterminal">$B</span>.size_hint(), sh); |
| )* |
| sh |
| } |
| } |
| |
| <span class="attribute">#[allow(non_snake_case)] |
| </span><span class="kw">impl</span><$(<span class="macro-nonterminal">$B</span>),<span class="kw-2">*</span>> ExactSizeIterator <span class="kw">for </span>Zip<($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>)> <span class="kw">where |
| </span>$( |
| <span class="macro-nonterminal">$B</span>: ExactSizeIterator, |
| )* |
| { } |
| |
| <span class="attribute">#[allow(non_snake_case)] |
| </span><span class="kw">impl</span><$(<span class="macro-nonterminal">$B</span>),<span class="kw-2">*</span>> DoubleEndedIterator <span class="kw">for </span>Zip<($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>)> <span class="kw">where |
| </span>$( |
| <span class="macro-nonterminal">$B</span>: DoubleEndedIterator + ExactSizeIterator, |
| )* |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">let </span>($(<span class="kw-2">ref mut </span><span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>) = <span class="self">self</span>.t; |
| <span class="kw">let </span>size = <span class="kw-2">*</span>[$( <span class="macro-nonterminal">$B</span>.len(), )<span class="kw-2">*</span>].iter().min().unwrap(); |
| |
| $( |
| <span class="kw">if </span><span class="macro-nonterminal">$B</span>.len() != size { |
| <span class="kw">for _ in </span><span class="number">0</span>..<span class="macro-nonterminal">$B</span>.len() - size { <span class="macro-nonterminal">$B</span>.next_back(); } |
| } |
| )* |
| |
| <span class="kw">match </span>($(<span class="macro-nonterminal">$B</span>.next_back(),)<span class="kw-2">*</span>) { |
| ($(<span class="prelude-val">Some</span>(<span class="macro-nonterminal">$B</span>),)<span class="kw-2">*</span>) => <span class="prelude-val">Some</span>(($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>)), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| } |
| ); |
| } |
| |
| <span class="macro">impl_zip_iter!</span>(A); |
| <span class="macro">impl_zip_iter!</span>(A, B); |
| <span class="macro">impl_zip_iter!</span>(A, B, C); |
| <span class="macro">impl_zip_iter!</span>(A, B, C, D); |
| <span class="macro">impl_zip_iter!</span>(A, B, C, D, E); |
| <span class="macro">impl_zip_iter!</span>(A, B, C, D, E, F); |
| <span class="macro">impl_zip_iter!</span>(A, B, C, D, E, F, G); |
| <span class="macro">impl_zip_iter!</span>(A, B, C, D, E, F, G, H); |
| <span class="macro">impl_zip_iter!</span>(A, B, C, D, E, F, G, H, I); |
| <span class="macro">impl_zip_iter!</span>(A, B, C, D, E, F, G, H, I, J); |
| <span class="macro">impl_zip_iter!</span>(A, B, C, D, E, F, G, H, I, J, K); |
| <span class="macro">impl_zip_iter!</span>(A, B, C, D, E, F, G, H, I, J, K, L); |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="itertools" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
