| <!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-0.8.2/src/cons_tuples_impl.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>cons_tuples_impl.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="macro">macro_rules! </span>impl_cons_iter( |
| (<span class="macro-nonterminal">$_A</span>:ident, <span class="macro-nonterminal">$_B</span>:ident, ) => (); <span class="comment">// stop |
| |
| </span>(<span class="macro-nonterminal">$A</span>:ident, $(<span class="macro-nonterminal">$B</span>:ident,)<span class="kw-2">*</span>) => ( |
| <span class="macro">impl_cons_iter!</span>($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>); |
| <span class="attribute">#[allow(non_snake_case)] |
| </span><span class="kw">impl</span><X, Iter, $(<span class="macro-nonterminal">$B</span>),<span class="kw-2">*</span>> Iterator <span class="kw">for </span>ConsTuples<Iter, (($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>), X)> |
| <span class="kw">where </span>Iter: Iterator<Item = (($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>), X)>, |
| { |
| <span class="kw">type </span>Item = ($(<span class="macro-nonterminal">$B</span>,)* X, ); |
| <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="self">self</span>.iter.next().map(|(($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>), x)| ($(<span class="macro-nonterminal">$B</span>,)* x, )) |
| } |
| |
| <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="self">self</span>.iter.size_hint() |
| } |
| <span class="kw">fn </span>fold<Acc, Fold>(<span class="self">self</span>, accum: Acc, <span class="kw-2">mut </span>f: Fold) -> Acc |
| <span class="kw">where </span>Fold: FnMut(Acc, <span class="self">Self</span>::Item) -> Acc, |
| { |
| <span class="self">self</span>.iter.fold(accum, <span class="kw">move </span>|acc, (($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>), x)| f(acc, ($(<span class="macro-nonterminal">$B</span>,)* x, ))) |
| } |
| } |
| |
| <span class="attribute">#[allow(non_snake_case)] |
| </span><span class="kw">impl</span><X, Iter, $(<span class="macro-nonterminal">$B</span>),<span class="kw-2">*</span>> DoubleEndedIterator <span class="kw">for </span>ConsTuples<Iter, (($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>), X)> |
| <span class="kw">where </span>Iter: DoubleEndedIterator<Item = (($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>), X)>, |
| { |
| <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="self">self</span>.iter.next().map(|(($(<span class="macro-nonterminal">$B</span>,)<span class="kw-2">*</span>), x)| ($(<span class="macro-nonterminal">$B</span>,)* x, )) |
| } |
| } |
| |
| ); |
| ); |
| |
| <span class="macro">impl_cons_iter!</span>(A, B, C, D, E, F, G, H,); |
| |
| <span class="doccomment">/// An iterator that maps an iterator of tuples like |
| /// `((A, B), C)` to an iterator of `(A, B, C)`. |
| /// |
| /// Used by the `iproduct!()` macro. |
| </span><span class="attribute">#[must_use = <span class="string">"iterator adaptors are lazy and do nothing unless consumed"</span>] |
| #[derive(Debug)] |
| </span><span class="kw">pub struct </span>ConsTuples<I, J> |
| <span class="kw">where </span>I: Iterator<Item=J>, |
| { |
| iter: I, |
| } |
| |
| <span class="kw">impl</span><I, J> Clone <span class="kw">for </span>ConsTuples<I, J> |
| <span class="kw">where </span>I: Clone + Iterator<Item=J>, |
| { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| ConsTuples { |
| iter: <span class="self">self</span>.iter.clone(), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Create an iterator that maps for example iterators of |
| /// `((A, B), C)` to `(A, B, C)`. |
| </span><span class="kw">pub fn </span>cons_tuples<I, J>(iterable: I) -> ConsTuples<I, J> |
| <span class="kw">where </span>I: Iterator<Item=J> |
| { |
| ConsTuples { iter: iterable.into_iter() } |
| } |
| </code></pre></div> |
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