| <!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/rciter_impl.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>rciter_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="kw">use </span>std::iter::{FusedIterator, IntoIterator}; |
| <span class="kw">use </span>alloc::rc::Rc; |
| <span class="kw">use </span>std::cell::RefCell; |
| |
| <span class="doccomment">/// A wrapper for `Rc<RefCell<I>>`, that implements the `Iterator` trait. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>RcIter<I> { |
| <span class="doccomment">/// The boxed iterator. |
| </span><span class="kw">pub </span>rciter: Rc<RefCell<I>>, |
| } |
| |
| <span class="doccomment">/// Return an iterator inside a `Rc<RefCell<_>>` wrapper. |
| /// |
| /// The returned `RcIter` can be cloned, and each clone will refer back to the |
| /// same original iterator. |
| /// |
| /// `RcIter` allows doing interesting things like using `.zip()` on an iterator with |
| /// itself, at the cost of runtime borrow checking which may have a performance |
| /// penalty. |
| /// |
| /// Iterator element type is `Self::Item`. |
| /// |
| /// ``` |
| /// use itertools::rciter; |
| /// use itertools::zip; |
| /// |
| /// // In this example a range iterator is created and we iterate it using |
| /// // three separate handles (two of them given to zip). |
| /// // We also use the IntoIterator implementation for `&RcIter`. |
| /// |
| /// let mut iter = rciter(0..9); |
| /// let mut z = zip(&iter, &iter); |
| /// |
| /// assert_eq!(z.next(), Some((0, 1))); |
| /// assert_eq!(z.next(), Some((2, 3))); |
| /// assert_eq!(z.next(), Some((4, 5))); |
| /// assert_eq!(iter.next(), Some(6)); |
| /// assert_eq!(z.next(), Some((7, 8))); |
| /// assert_eq!(z.next(), None); |
| /// ``` |
| /// |
| /// **Panics** in iterator methods if a borrow error is encountered in the |
| /// iterator methods. It can only happen if the `RcIter` is reentered in |
| /// `.next()`, i.e. if it somehow participates in an “iterator knot” |
| /// where it is an adaptor of itself. |
| </span><span class="kw">pub fn </span>rciter<I>(iterable: I) -> RcIter<I::IntoIter> |
| <span class="kw">where </span>I: IntoIterator |
| { |
| RcIter { rciter: Rc::new(RefCell::new(iterable.into_iter())) } |
| } |
| |
| <span class="kw">impl</span><I> Clone <span class="kw">for </span>RcIter<I> { |
| <span class="macro">clone_fields!</span>(rciter); |
| } |
| |
| <span class="kw">impl</span><A, I> Iterator <span class="kw">for </span>RcIter<I> |
| <span class="kw">where </span>I: Iterator<Item = A> |
| { |
| <span class="kw">type </span>Item = A; |
| <span class="attribute">#[inline] |
| </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="self">self</span>.rciter.borrow_mut().next() |
| } |
| |
| <span class="attribute">#[inline] |
| </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="comment">// To work sanely with other API that assume they own an iterator, |
| // so it can't change in other places, we can't guarantee as much |
| // in our size_hint. Other clones may drain values under our feet. |
| </span>(<span class="number">0</span>, <span class="self">self</span>.rciter.borrow().size_hint().<span class="number">1</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><I> DoubleEndedIterator <span class="kw">for </span>RcIter<I> |
| <span class="kw">where </span>I: DoubleEndedIterator |
| { |
| <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="self">self</span>.rciter.borrow_mut().next_back() |
| } |
| } |
| |
| <span class="doccomment">/// Return an iterator from `&RcIter<I>` (by simply cloning it). |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>, I> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>RcIter<I> |
| <span class="kw">where </span>I: Iterator |
| { |
| <span class="kw">type </span>Item = I::Item; |
| <span class="kw">type </span>IntoIter = RcIter<I>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> RcIter<I> { |
| <span class="self">self</span>.clone() |
| } |
| } |
| |
| |
| <span class="kw">impl</span><A, I> FusedIterator <span class="kw">for </span>RcIter<I> |
| <span class="kw">where </span>I: FusedIterator<Item = A> |
| {} |
| </code></pre></div> |
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