| <!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/diff.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>diff.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="doccomment">//! "Diff"ing iterators for caching elements to sequential collections without requiring the new |
| //! elements' iterator to be `Clone`. |
| //! |
| //! - [**Diff**](./enum.Diff.html) (produced by the [**diff_with**](./fn.diff_with.html) function) |
| //! describes the difference between two non-`Clone` iterators `I` and `J` after breaking ASAP from |
| //! a lock-step comparison. |
| |
| </span><span class="kw">use </span>free::put_back; |
| <span class="kw">use </span>structs::PutBack; |
| |
| <span class="doccomment">/// A type returned by the [`diff_with`](./fn.diff_with.html) function. |
| /// |
| /// `Diff` represents the way in which the elements yielded by the iterator `I` differ to some |
| /// iterator `J`. |
| </span><span class="kw">pub enum </span>Diff<I, J> |
| <span class="kw">where </span>I: Iterator, |
| J: Iterator |
| { |
| <span class="doccomment">/// The index of the first non-matching element along with both iterator's remaining elements |
| /// starting with the first mis-match. |
| </span>FirstMismatch(usize, PutBack<I>, PutBack<J>), |
| <span class="doccomment">/// The total number of elements that were in `J` along with the remaining elements of `I`. |
| </span>Shorter(usize, PutBack<I>), |
| <span class="doccomment">/// The total number of elements that were in `I` along with the remaining elements of `J`. |
| </span>Longer(usize, PutBack<J>), |
| } |
| |
| <span class="doccomment">/// Compares every element yielded by both `i` and `j` with the given function in lock-step and |
| /// returns a `Diff` which describes how `j` differs from `i`. |
| /// |
| /// If the number of elements yielded by `j` is less than the number of elements yielded by `i`, |
| /// the number of `j` elements yielded will be returned along with `i`'s remaining elements as |
| /// `Diff::Shorter`. |
| /// |
| /// If the two elements of a step differ, the index of those elements along with the remaining |
| /// elements of both `i` and `j` are returned as `Diff::FirstMismatch`. |
| /// |
| /// If `i` becomes exhausted before `j` becomes exhausted, the number of elements in `i` along with |
| /// the remaining `j` elements will be returned as `Diff::Longer`. |
| </span><span class="kw">pub fn </span>diff_with<I, J, F>(i: I, j: J, is_equal: F) |
| -> <span class="prelude-ty">Option</span><Diff<I::IntoIter, J::IntoIter>> |
| <span class="kw">where </span>I: IntoIterator, |
| J: IntoIterator, |
| F: Fn(<span class="kw-2">&</span>I::Item, <span class="kw-2">&</span>J::Item) -> bool |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>i = i.into_iter(); |
| <span class="kw">let </span><span class="kw-2">mut </span>j = j.into_iter(); |
| <span class="kw">let </span><span class="kw-2">mut </span>idx = <span class="number">0</span>; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(i_elem) = i.next() { |
| <span class="kw">match </span>j.next() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Some</span>(Diff::Shorter(idx, put_back(i).with_value(i_elem))), |
| <span class="prelude-val">Some</span>(j_elem) => <span class="kw">if </span>!is_equal(<span class="kw-2">&</span>i_elem, <span class="kw-2">&</span>j_elem) { |
| <span class="kw">let </span>remaining_i = put_back(i).with_value(i_elem); |
| <span class="kw">let </span>remaining_j = put_back(j).with_value(j_elem); |
| <span class="kw">return </span><span class="prelude-val">Some</span>(Diff::FirstMismatch(idx, remaining_i, remaining_j)); |
| }, |
| } |
| idx += <span class="number">1</span>; |
| } |
| j.next().map(|j_elem| Diff::Longer(idx, put_back(j).with_value(j_elem))) |
| } |
| </code></pre></div> |
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