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<!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/tinyvec-1.6.0/src/arrayvec_drain.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>arrayvec_drain.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="../../tinyvec/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="../../tinyvec/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 super</span>::<span class="kw-2">*</span>;
<span class="kw">use </span>core::{
ops::{Bound, RangeBounds},
slice,
};
<span class="doccomment">/// Draining iterator for [`ArrayVec`]
///
/// See [`ArrayVec::drain`](ArrayVec::drain)
</span><span class="kw">pub struct </span>ArrayVecDrain&lt;<span class="lifetime">&#39;a</span>, T: <span class="lifetime">&#39;a </span>+ Default&gt; {
iter: slice::IterMut&lt;<span class="lifetime">&#39;a</span>, T&gt;,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T: <span class="lifetime">&#39;a </span>+ Default&gt; ArrayVecDrain&lt;<span class="lifetime">&#39;a</span>, T&gt; {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new&lt;A, R&gt;(arr: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>ArrayVec&lt;A&gt;, range: R) -&gt; <span class="self">Self
</span><span class="kw">where
</span>A: Array&lt;Item = T&gt;,
R: RangeBounds&lt;usize&gt;,
{
<span class="kw">let </span>start = <span class="kw">match </span>range.start_bound() {
Bound::Unbounded =&gt; <span class="number">0</span>,
Bound::Included(<span class="kw-2">&amp;</span>n) =&gt; n,
Bound::Excluded(<span class="kw-2">&amp;</span>n) =&gt; n.saturating_add(<span class="number">1</span>),
};
<span class="kw">let </span>end = <span class="kw">match </span>range.end_bound() {
Bound::Unbounded =&gt; arr.len(),
Bound::Included(<span class="kw-2">&amp;</span>n) =&gt; n.saturating_add(<span class="number">1</span>),
Bound::Excluded(<span class="kw-2">&amp;</span>n) =&gt; n,
};
<span class="macro">assert!</span>(
start &lt;= end,
<span class="string">&quot;ArrayVec::drain&gt; Illegal range, {} to {}&quot;</span>,
start,
end
);
<span class="macro">assert!</span>(
end &lt;= arr.len(),
<span class="string">&quot;ArrayVec::drain&gt; Range ends at {}, but length is only {}&quot;</span>,
end,
arr.len()
);
<span class="kw">let </span>len = end - start;
<span class="kw">let </span>to_rotate = <span class="kw-2">&amp;mut </span>arr[start..];
to_rotate.rotate_left(len);
<span class="kw">let </span>oldlen = arr.len();
<span class="kw">let </span>newlen = oldlen - len;
arr.set_len(newlen);
<span class="kw">let </span>slice = <span class="kw-2">&amp;mut </span>arr.data.as_slice_mut()[newlen..oldlen];
<span class="kw">let </span>iter = slice.iter_mut();
<span class="self">Self </span>{ iter }
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T: <span class="lifetime">&#39;a </span>+ Default&gt; DoubleEndedIterator <span class="kw">for </span>ArrayVecDrain&lt;<span class="lifetime">&#39;a</span>, T&gt; {
<span class="kw">fn </span>next_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
<span class="self">self</span>.iter.next_back().map(take)
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;rustc_1_40&quot;</span>)]
</span><span class="kw">fn </span>nth_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>, n: usize) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
<span class="self">self</span>.iter.nth_back(n).map(take)
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T: <span class="lifetime">&#39;a </span>+ Default&gt; Iterator <span class="kw">for </span>ArrayVecDrain&lt;<span class="lifetime">&#39;a</span>, T&gt; {
<span class="kw">type </span>Item = T;
<span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
<span class="self">self</span>.iter.next().map(take)
}
<span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
<span class="self">self</span>.iter.size_hint()
}
<span class="kw">fn </span>nth(<span class="kw-2">&amp;mut </span><span class="self">self</span>, n: usize) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
<span class="self">self</span>.iter.nth(n).map(take)
}
<span class="kw">fn </span>last(<span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
<span class="self">self</span>.iter.last().map(take)
}
<span class="kw">fn </span>for_each&lt;F&gt;(<span class="self">self</span>, f: F)
<span class="kw">where
</span>F: FnMut(<span class="self">Self</span>::Item),
{
<span class="self">self</span>.iter.map(take).for_each(f)
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T: <span class="lifetime">&#39;a </span>+ Default&gt; FusedIterator <span class="kw">for </span>ArrayVecDrain&lt;<span class="lifetime">&#39;a</span>, T&gt; {}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T: <span class="lifetime">&#39;a </span>+ Default&gt; ExactSizeIterator <span class="kw">for </span>ArrayVecDrain&lt;<span class="lifetime">&#39;a</span>, T&gt; {}
<span class="comment">/* No need to impl Drop! */
</span></code></pre></div>
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