<!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 to the Rust file `/home/mrh/.cargo/registry/src/github.com-1ecc6299db9ec823/rayon-1.1.0/src/iter/intersperse.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>intersperse.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="shortcut icon" href="../../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../rayon/index.html'><div class='logo-container'><img src='../../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">plumbing</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">Cell</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>::{<span class="self">self</span>, <span class="ident">Fuse</span>};
<span class="doccomment">/// `Intersperse` is an iterator that inserts a particular item between each</span>
<span class="doccomment">/// item of the adapted iterator. This struct is created by the</span>
<span class="doccomment">/// [`intersperse()`] method on [`ParallelIterator`]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`intersperse()`]: trait.ParallelIterator.html#method.intersperse</span>
<span class="doccomment">/// [`ParallelIterator`]: trait.ParallelIterator.html</span>
<span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"iterator adaptors are lazy and do nothing unless consumed"</span>]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Intersperse</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">ParallelIterator</span>,
<span class="ident">I</span>::<span class="ident">Item</span>: <span class="ident">Clone</span>,
{
<span class="ident">base</span>: <span class="ident">I</span>,
<span class="ident">item</span>: <span class="ident">I</span>::<span class="ident">Item</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="ident">Intersperse</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">ParallelIterator</span>,
<span class="ident">I</span>::<span class="ident">Item</span>: <span class="ident">Clone</span>,
{
<span class="doccomment">/// Create a new `Intersperse` iterator</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">base</span>: <span class="ident">I</span>, <span class="ident">item</span>: <span class="ident">I</span>::<span class="ident">Item</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">Intersperse</span> { <span class="ident">base</span>, <span class="ident">item</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="ident">ParallelIterator</span> <span class="kw">for</span> <span class="ident">Intersperse</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">ParallelIterator</span>,
<span class="ident">I</span>::<span class="ident">Item</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">Send</span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">I</span>::<span class="ident">Item</span>;
<span class="kw">fn</span> <span class="ident">drive_unindexed</span><span class="op"><</span><span class="ident">C</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">consumer</span>: <span class="ident">C</span>) <span class="op">-</span><span class="op">></span> <span class="ident">C</span>::<span class="prelude-ty">Result</span>
<span class="kw">where</span>
<span class="ident">C</span>: <span class="ident">UnindexedConsumer</span><span class="op"><</span><span class="ident">I</span>::<span class="ident">Item</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="ident">consumer1</span> <span class="op">=</span> <span class="ident">IntersperseConsumer</span>::<span class="ident">new</span>(<span class="ident">consumer</span>, <span class="self">self</span>.<span class="ident">item</span>);
<span class="self">self</span>.<span class="ident">base</span>.<span class="ident">drive_unindexed</span>(<span class="ident">consumer1</span>)
}
<span class="kw">fn</span> <span class="ident">opt_len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">opt_len</span>()<span class="question-mark">?</span> {
<span class="number">0</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="number">0</span>),
<span class="ident">len</span> <span class="op">=</span><span class="op">></span> <span class="ident">len</span>.<span class="ident">checked_add</span>(<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>),
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="ident">IndexedParallelIterator</span> <span class="kw">for</span> <span class="ident">Intersperse</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IndexedParallelIterator</span>,
<span class="ident">I</span>::<span class="ident">Item</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">Send</span>,
{
<span class="kw">fn</span> <span class="ident">drive</span><span class="op"><</span><span class="ident">C</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">consumer</span>: <span class="ident">C</span>) <span class="op">-</span><span class="op">></span> <span class="ident">C</span>::<span class="prelude-ty">Result</span>
<span class="kw">where</span>
<span class="ident">C</span>: <span class="ident">Consumer</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="ident">consumer1</span> <span class="op">=</span> <span class="ident">IntersperseConsumer</span>::<span class="ident">new</span>(<span class="ident">consumer</span>, <span class="self">self</span>.<span class="ident">item</span>);
<span class="self">self</span>.<span class="ident">base</span>.<span class="ident">drive</span>(<span class="ident">consumer1</span>)
}
<span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">len</span>();
<span class="kw">if</span> <span class="ident">len</span> <span class="op">></span> <span class="number">0</span> {
<span class="ident">len</span>.<span class="ident">checked_add</span>(<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>).<span class="ident">expect</span>(<span class="string">"overflow"</span>)
} <span class="kw">else</span> {
<span class="number">0</span>
}
}
<span class="kw">fn</span> <span class="ident">with_producer</span><span class="op"><</span><span class="ident">CB</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">callback</span>: <span class="ident">CB</span>) <span class="op">-</span><span class="op">></span> <span class="ident">CB</span>::<span class="ident">Output</span>
<span class="kw">where</span>
<span class="ident">CB</span>: <span class="ident">ProducerCallback</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="kw">return</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">with_producer</span>(<span class="ident">Callback</span> {
<span class="ident">callback</span>,
<span class="ident">item</span>: <span class="self">self</span>.<span class="ident">item</span>,
<span class="ident">len</span>,
});
<span class="kw">struct</span> <span class="ident">Callback</span><span class="op"><</span><span class="ident">CB</span>, <span class="ident">T</span><span class="op">></span> {
<span class="ident">callback</span>: <span class="ident">CB</span>,
<span class="ident">item</span>: <span class="ident">T</span>,
<span class="ident">len</span>: <span class="ident">usize</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">CB</span><span class="op">></span> <span class="ident">ProducerCallback</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Callback</span><span class="op"><</span><span class="ident">CB</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">CB</span>: <span class="ident">ProducerCallback</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
<span class="ident">T</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">Send</span>,
{
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">CB</span>::<span class="ident">Output</span>;
<span class="kw">fn</span> <span class="ident">callback</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">base</span>: <span class="ident">P</span>) <span class="op">-</span><span class="op">></span> <span class="ident">CB</span>::<span class="ident">Output</span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">Producer</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="ident">producer</span> <span class="op">=</span> <span class="ident">IntersperseProducer</span>::<span class="ident">new</span>(<span class="ident">base</span>, <span class="self">self</span>.<span class="ident">item</span>, <span class="self">self</span>.<span class="ident">len</span>);
<span class="self">self</span>.<span class="ident">callback</span>.<span class="ident">callback</span>(<span class="ident">producer</span>)
}
}
}
}
<span class="kw">struct</span> <span class="ident">IntersperseProducer</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">Producer</span>,
{
<span class="ident">base</span>: <span class="ident">P</span>,
<span class="ident">item</span>: <span class="ident">P</span>::<span class="ident">Item</span>,
<span class="ident">len</span>: <span class="ident">usize</span>,
<span class="ident">clone_first</span>: <span class="ident">bool</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">P</span><span class="op">></span> <span class="ident">IntersperseProducer</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">Producer</span>,
{
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">base</span>: <span class="ident">P</span>, <span class="ident">item</span>: <span class="ident">P</span>::<span class="ident">Item</span>, <span class="ident">len</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">IntersperseProducer</span> {
<span class="ident">base</span>,
<span class="ident">item</span>,
<span class="ident">len</span>,
<span class="ident">clone_first</span>: <span class="bool-val">false</span>,
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">P</span><span class="op">></span> <span class="ident">Producer</span> <span class="kw">for</span> <span class="ident">IntersperseProducer</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">Producer</span>,
<span class="ident">P</span>::<span class="ident">Item</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">Send</span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">P</span>::<span class="ident">Item</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IntersperseIter</span><span class="op"><</span><span class="ident">P</span>::<span class="ident">IntoIter</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>::<span class="ident">IntoIter</span> {
<span class="ident">IntersperseIter</span> {
<span class="ident">base</span>: <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">into_iter</span>().<span class="ident">fuse</span>(),
<span class="ident">item</span>: <span class="self">self</span>.<span class="ident">item</span>,
<span class="ident">clone_first</span>: <span class="self">self</span>.<span class="ident">len</span> <span class="op">></span> <span class="number">0</span> <span class="kw-2">&</span><span class="op">&</span> <span class="self">self</span>.<span class="ident">clone_first</span>,
<span class="comment">// If there's more than one item, then even lengths end the opposite</span>
<span class="comment">// of how they started with respect to interspersed clones.</span>
<span class="ident">clone_last</span>: <span class="self">self</span>.<span class="ident">len</span> <span class="op">></span> <span class="number">1</span> <span class="kw-2">&</span><span class="op">&</span> ((<span class="self">self</span>.<span class="ident">len</span> <span class="op">&</span> <span class="number">1</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span>) <span class="op">^</span> <span class="self">self</span>.<span class="ident">clone_first</span>),
}
}
<span class="kw">fn</span> <span class="ident">min_len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">base</span>.<span class="ident">min_len</span>()
}
<span class="kw">fn</span> <span class="ident">max_len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">base</span>.<span class="ident">max_len</span>()
}
<span class="kw">fn</span> <span class="ident">split_at</span>(<span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> (<span class="self">Self</span>, <span class="self">Self</span>) {
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">index</span> <span class="op"><</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>);
<span class="comment">// The left needs half of the items from the base producer, and the</span>
<span class="comment">// other half will be our interspersed item. If we're not leading with</span>
<span class="comment">// a cloned item, then we need to round up the base number of items,</span>
<span class="comment">// otherwise round down.</span>
<span class="kw">let</span> <span class="ident">base_index</span> <span class="op">=</span> (<span class="ident">index</span> <span class="op">+</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">clone_first</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">/</span> <span class="number">2</span>;
<span class="kw">let</span> (<span class="ident">left_base</span>, <span class="ident">right_base</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">split_at</span>(<span class="ident">base_index</span>);
<span class="kw">let</span> <span class="ident">left</span> <span class="op">=</span> <span class="ident">IntersperseProducer</span> {
<span class="ident">base</span>: <span class="ident">left_base</span>,
<span class="ident">item</span>: <span class="self">self</span>.<span class="ident">item</span>.<span class="ident">clone</span>(),
<span class="ident">len</span>: <span class="ident">index</span>,
<span class="ident">clone_first</span>: <span class="self">self</span>.<span class="ident">clone_first</span>,
};
<span class="kw">let</span> <span class="ident">right</span> <span class="op">=</span> <span class="ident">IntersperseProducer</span> {
<span class="ident">base</span>: <span class="ident">right_base</span>,
<span class="ident">item</span>: <span class="self">self</span>.<span class="ident">item</span>,
<span class="ident">len</span>: <span class="self">self</span>.<span class="ident">len</span> <span class="op">-</span> <span class="ident">index</span>,
<span class="comment">// If the index is odd, the right side toggles `clone_first`.</span>
<span class="ident">clone_first</span>: (<span class="ident">index</span> <span class="op">&</span> <span class="number">1</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span>) <span class="op">^</span> <span class="self">self</span>.<span class="ident">clone_first</span>,
};
(<span class="ident">left</span>, <span class="ident">right</span>)
}
<span class="kw">fn</span> <span class="ident">fold_with</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">folder</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">F</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">Folder</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="ident">folder1</span> <span class="op">=</span> <span class="ident">IntersperseFolder</span> {
<span class="ident">base</span>: <span class="ident">folder</span>,
<span class="ident">item</span>: <span class="self">self</span>.<span class="ident">item</span>,
<span class="ident">clone_first</span>: <span class="self">self</span>.<span class="ident">clone_first</span>,
};
<span class="self">self</span>.<span class="ident">base</span>.<span class="ident">fold_with</span>(<span class="ident">folder1</span>).<span class="ident">base</span>
}
}
<span class="kw">struct</span> <span class="ident">IntersperseIter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">Iterator</span>,
{
<span class="ident">base</span>: <span class="ident">Fuse</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>,
<span class="ident">item</span>: <span class="ident">I</span>::<span class="ident">Item</span>,
<span class="ident">clone_first</span>: <span class="ident">bool</span>,
<span class="ident">clone_last</span>: <span class="ident">bool</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntersperseIter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">DoubleEndedIterator</span> <span class="op">+</span> <span class="ident">ExactSizeIterator</span>,
<span class="ident">I</span>::<span class="ident">Item</span>: <span class="ident">Clone</span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">I</span>::<span class="ident">Item</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">clone_first</span> {
<span class="self">self</span>.<span class="ident">clone_first</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">item</span>.<span class="ident">clone</span>())
} <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="ident">next</span> @ <span class="prelude-val">Some</span>(<span class="kw">_</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">next</span>() {
<span class="comment">// If there are any items left, we'll need another clone in front.</span>
<span class="self">self</span>.<span class="ident">clone_first</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">len</span>() <span class="op">!</span><span class="op">=</span> <span class="number">0</span>;
<span class="ident">next</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">clone_last</span> {
<span class="self">self</span>.<span class="ident">clone_last</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">item</span>.<span class="ident">clone</span>())
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
(<span class="ident">len</span>, <span class="prelude-val">Some</span>(<span class="ident">len</span>))
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IntersperseIter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">DoubleEndedIterator</span> <span class="op">+</span> <span class="ident">ExactSizeIterator</span>,
<span class="ident">I</span>::<span class="ident">Item</span>: <span class="ident">Clone</span>,
{
<span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">clone_last</span> {
<span class="self">self</span>.<span class="ident">clone_last</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">item</span>.<span class="ident">clone</span>())
} <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="ident">next_back</span> @ <span class="prelude-val">Some</span>(<span class="kw">_</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">next_back</span>() {
<span class="comment">// If there are any items left, we'll need another clone in back.</span>
<span class="self">self</span>.<span class="ident">clone_last</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">len</span>() <span class="op">!</span><span class="op">=</span> <span class="number">0</span>;
<span class="ident">next_back</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">clone_first</span> {
<span class="self">self</span>.<span class="ident">clone_first</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">item</span>.<span class="ident">clone</span>())
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IntersperseIter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">DoubleEndedIterator</span> <span class="op">+</span> <span class="ident">ExactSizeIterator</span>,
<span class="ident">I</span>::<span class="ident">Item</span>: <span class="ident">Clone</span>,
{
<span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">len</span>();
<span class="ident">len</span> <span class="op">+</span> <span class="ident">len</span>.<span class="ident">saturating_sub</span>(<span class="number">1</span>) <span class="op">+</span> <span class="self">self</span>.<span class="ident">clone_first</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">clone_last</span> <span class="kw">as</span> <span class="ident">usize</span>
}
}
<span class="kw">struct</span> <span class="ident">IntersperseConsumer</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span><span class="op">></span> {
<span class="ident">base</span>: <span class="ident">C</span>,
<span class="ident">item</span>: <span class="ident">T</span>,
<span class="ident">clone_first</span>: <span class="ident">Cell</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntersperseConsumer</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">C</span>: <span class="ident">Consumer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
{
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">base</span>: <span class="ident">C</span>, <span class="ident">item</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">IntersperseConsumer</span> {
<span class="ident">base</span>,
<span class="ident">item</span>,
<span class="ident">clone_first</span>: <span class="bool-val">false</span>.<span class="ident">into</span>(),
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Consumer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">IntersperseConsumer</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">C</span>: <span class="ident">Consumer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
<span class="ident">T</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">Send</span>,
{
<span class="kw">type</span> <span class="ident">Folder</span> <span class="op">=</span> <span class="ident">IntersperseFolder</span><span class="op"><</span><span class="ident">C</span>::<span class="ident">Folder</span>, <span class="ident">T</span><span class="op">></span>;
<span class="kw">type</span> <span class="ident">Reducer</span> <span class="op">=</span> <span class="ident">C</span>::<span class="ident">Reducer</span>;
<span class="kw">type</span> <span class="prelude-ty">Result</span> <span class="op">=</span> <span class="ident">C</span>::<span class="prelude-ty">Result</span>;
<span class="kw">fn</span> <span class="ident">split_at</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> (<span class="self">Self</span>, <span class="self">Self</span>, <span class="self">Self</span>::<span class="ident">Reducer</span>) {
<span class="comment">// We'll feed twice as many items to the base consumer, except if we're</span>
<span class="comment">// not currently leading with a cloned item, then it's one less.</span>
<span class="kw">let</span> <span class="ident">base_index</span> <span class="op">=</span> <span class="ident">index</span> <span class="op">+</span> <span class="ident">index</span>.<span class="ident">saturating_sub</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">clone_first</span>.<span class="ident">get</span>() <span class="kw">as</span> <span class="ident">usize</span>);
<span class="kw">let</span> (<span class="ident">left</span>, <span class="ident">right</span>, <span class="ident">reducer</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">split_at</span>(<span class="ident">base_index</span>);
<span class="kw">let</span> <span class="ident">right</span> <span class="op">=</span> <span class="ident">IntersperseConsumer</span> {
<span class="ident">base</span>: <span class="ident">right</span>,
<span class="ident">item</span>: <span class="self">self</span>.<span class="ident">item</span>.<span class="ident">clone</span>(),
<span class="ident">clone_first</span>: <span class="bool-val">true</span>.<span class="ident">into</span>(),
};
<span class="self">self</span>.<span class="ident">base</span> <span class="op">=</span> <span class="ident">left</span>;
(<span class="self">self</span>, <span class="ident">right</span>, <span class="ident">reducer</span>)
}
<span class="kw">fn</span> <span class="ident">into_folder</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>::<span class="ident">Folder</span> {
<span class="ident">IntersperseFolder</span> {
<span class="ident">base</span>: <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">into_folder</span>(),
<span class="ident">item</span>: <span class="self">self</span>.<span class="ident">item</span>,
<span class="ident">clone_first</span>: <span class="self">self</span>.<span class="ident">clone_first</span>.<span class="ident">get</span>(),
}
}
<span class="kw">fn</span> <span class="ident">full</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">base</span>.<span class="ident">full</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">UnindexedConsumer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">IntersperseConsumer</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">C</span>: <span class="ident">UnindexedConsumer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
<span class="ident">T</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">Send</span>,
{
<span class="kw">fn</span> <span class="ident">split_off_left</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">left</span> <span class="op">=</span> <span class="ident">IntersperseConsumer</span> {
<span class="ident">base</span>: <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">split_off_left</span>(),
<span class="ident">item</span>: <span class="self">self</span>.<span class="ident">item</span>.<span class="ident">clone</span>(),
<span class="ident">clone_first</span>: <span class="self">self</span>.<span class="ident">clone_first</span>.<span class="ident">clone</span>(),
};
<span class="self">self</span>.<span class="ident">clone_first</span>.<span class="ident">set</span>(<span class="bool-val">true</span>);
<span class="ident">left</span>
}
<span class="kw">fn</span> <span class="ident">to_reducer</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>::<span class="ident">Reducer</span> {
<span class="self">self</span>.<span class="ident">base</span>.<span class="ident">to_reducer</span>()
}
}
<span class="kw">struct</span> <span class="ident">IntersperseFolder</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span><span class="op">></span> {
<span class="ident">base</span>: <span class="ident">C</span>,
<span class="ident">item</span>: <span class="ident">T</span>,
<span class="ident">clone_first</span>: <span class="ident">bool</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Folder</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">IntersperseFolder</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">C</span>: <span class="ident">Folder</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
<span class="ident">T</span>: <span class="ident">Clone</span>,
{
<span class="kw">type</span> <span class="prelude-ty">Result</span> <span class="op">=</span> <span class="ident">C</span>::<span class="prelude-ty">Result</span>;
<span class="kw">fn</span> <span class="ident">consume</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">item</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">clone_first</span> {
<span class="self">self</span>.<span class="ident">base</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">consume</span>(<span class="self">self</span>.<span class="ident">item</span>.<span class="ident">clone</span>());
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">full</span>() {
<span class="kw">return</span> <span class="self">self</span>;
}
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">clone_first</span> <span class="op">=</span> <span class="bool-val">true</span>;
}
<span class="self">self</span>.<span class="ident">base</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">consume</span>(<span class="ident">item</span>);
<span class="self">self</span>
}
<span class="kw">fn</span> <span class="ident">consume_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">clone_first</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">clone_first</span>;
<span class="kw">let</span> <span class="ident">between_item</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">item</span>;
<span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">consume_iter</span>(<span class="ident">iter</span>.<span class="ident">into_iter</span>().<span class="ident">flat_map</span>(<span class="op">|</span><span class="ident">item</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">first</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">clone_first</span> {
<span class="prelude-val">Some</span>(<span class="ident">between_item</span>.<span class="ident">clone</span>())
} <span class="kw">else</span> {
<span class="ident">clone_first</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="prelude-val">None</span>
};
<span class="ident">first</span>.<span class="ident">into_iter</span>().<span class="ident">chain</span>(<span class="ident">iter</span>::<span class="ident">once</span>(<span class="ident">item</span>))
}));
<span class="ident">IntersperseFolder</span> {
<span class="ident">base</span>,
<span class="ident">item</span>: <span class="ident">between_item</span>,
<span class="ident">clone_first</span>,
}
}
<span class="kw">fn</span> <span class="ident">complete</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">C</span>::<span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="ident">base</span>.<span class="ident">complete</span>()
}
<span class="kw">fn</span> <span class="ident">full</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">base</span>.<span class="ident">full</span>()
}
}
</pre></div>
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