| <!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/adaptors/map.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>map.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::FromIterator; |
| <span class="kw">use </span>std::marker::PhantomData; |
| |
| <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>MapSpecialCase<I, F> { |
| iter: I, |
| f: F, |
| } |
| |
| <span class="kw">pub trait </span>MapSpecialCaseFn<T> { |
| <span class="kw">type </span>Out; |
| <span class="kw">fn </span>call(<span class="kw-2">&mut </span><span class="self">self</span>, t: T) -> <span class="self">Self</span>::Out; |
| } |
| |
| <span class="kw">impl</span><I, R> Iterator <span class="kw">for </span>MapSpecialCase<I, R> |
| <span class="kw">where |
| </span>I: Iterator, |
| R: MapSpecialCaseFn<I::Item>, |
| { |
| <span class="kw">type </span>Item = R::Out; |
| |
| <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(|i| <span class="self">self</span>.f.call(i)) |
| } |
| |
| <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>, init: Acc, <span class="kw-2">mut </span>fold_f: Fold) -> Acc |
| <span class="kw">where |
| </span>Fold: FnMut(Acc, <span class="self">Self</span>::Item) -> Acc, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>f = <span class="self">self</span>.f; |
| <span class="self">self</span>.iter.fold(init, <span class="kw">move </span>|acc, v| fold_f(acc, f.call(v))) |
| } |
| |
| <span class="kw">fn </span>collect<C>(<span class="self">self</span>) -> C |
| <span class="kw">where |
| </span>C: FromIterator<<span class="self">Self</span>::Item>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>f = <span class="self">self</span>.f; |
| <span class="self">self</span>.iter.map(<span class="kw">move </span>|v| f.call(v)).collect() |
| } |
| } |
| |
| <span class="kw">impl</span><I, R> DoubleEndedIterator <span class="kw">for </span>MapSpecialCase<I, R> |
| <span class="kw">where |
| </span>I: DoubleEndedIterator, |
| R: MapSpecialCaseFn<I::Item>, |
| { |
| <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_back().map(|i| <span class="self">self</span>.f.call(i)) |
| } |
| } |
| |
| <span class="kw">impl</span><I, R> ExactSizeIterator <span class="kw">for </span>MapSpecialCase<I, R> |
| <span class="kw">where |
| </span>I: ExactSizeIterator, |
| R: MapSpecialCaseFn<I::Item>, |
| { |
| } |
| |
| <span class="doccomment">/// An iterator adapter to apply a transformation within a nested `Result::Ok`. |
| /// |
| /// See [`.map_ok()`](crate::Itertools::map_ok) for more information. |
| </span><span class="kw">pub type </span>MapOk<I, F> = MapSpecialCase<I, MapSpecialCaseFnOk<F>>; |
| |
| <span class="doccomment">/// See [`MapOk`]. |
| </span><span class="attribute">#[deprecated(note = <span class="string">"Use MapOk instead"</span>, since = <span class="string">"0.10.0"</span>)] |
| </span><span class="kw">pub type </span>MapResults<I, F> = MapOk<I, F>; |
| |
| <span class="kw">impl</span><F, T, U, E> MapSpecialCaseFn<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>MapSpecialCaseFnOk<F> |
| <span class="kw">where |
| </span>F: FnMut(T) -> U, |
| { |
| <span class="kw">type </span>Out = <span class="prelude-ty">Result</span><U, E>; |
| <span class="kw">fn </span>call(<span class="kw-2">&mut </span><span class="self">self</span>, t: <span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Out { |
| t.map(|v| <span class="self">self</span>.<span class="number">0</span>(v)) |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>MapSpecialCaseFnOk<F>(F); |
| |
| <span class="kw">impl</span><F> std::fmt::Debug <span class="kw">for </span>MapSpecialCaseFnOk<F> { |
| <span class="macro">debug_fmt_fields!</span>(MapSpecialCaseFnOk,); |
| } |
| |
| <span class="doccomment">/// Create a new `MapOk` iterator. |
| </span><span class="kw">pub fn </span>map_ok<I, F, T, U, E>(iter: I, f: F) -> MapOk<I, F> |
| <span class="kw">where |
| </span>I: Iterator<Item = <span class="prelude-ty">Result</span><T, E>>, |
| F: FnMut(T) -> U, |
| { |
| MapSpecialCase { |
| iter, |
| f: MapSpecialCaseFnOk(f), |
| } |
| } |
| |
| <span class="doccomment">/// An iterator adapter to apply `Into` conversion to each element. |
| /// |
| /// See [`.map_into()`](crate::Itertools::map_into) for more information. |
| </span><span class="kw">pub type </span>MapInto<I, R> = MapSpecialCase<I, MapSpecialCaseFnInto<R>>; |
| |
| <span class="kw">impl</span><T: Into<U>, U> MapSpecialCaseFn<T> <span class="kw">for </span>MapSpecialCaseFnInto<U> { |
| <span class="kw">type </span>Out = U; |
| <span class="kw">fn </span>call(<span class="kw-2">&mut </span><span class="self">self</span>, t: T) -> <span class="self">Self</span>::Out { |
| t.into() |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>MapSpecialCaseFnInto<U>(PhantomData<U>); |
| |
| <span class="doccomment">/// Create a new [`MapInto`] iterator. |
| </span><span class="kw">pub fn </span>map_into<I, R>(iter: I) -> MapInto<I, R> { |
| MapSpecialCase { |
| iter, |
| f: MapSpecialCaseFnInto(PhantomData), |
| } |
| } |
| </code></pre></div> |
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