<!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 `/home/sangenya/.cargo/registry/src/github.com-1ecc6299db9ec823/itertools-0.7.11/src/intersperse.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>intersperse.rs - 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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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</pre><pre class="rust">
<span class="kw">use</span> <span class="ident">std::iter::Fuse</span>;
<span class="kw">use</span> <span class="kw">super</span><span class="ident">::size_hint</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="doccomment">/// An iterator adaptor to insert a particular value</span>
<span class="doccomment">/// between each element of the adapted iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `I::Item`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator is *fused*.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See [`.intersperse()`](../trait.Itertools.html#method.intersperse) for more information.</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">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">Iterator</span>
{
<span class="ident">element</span>: <span class="ident">I::Item</span>,
<span class="ident">iter</span>: <span class="ident">Fuse</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>,
<span class="ident">peek</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">I::Item</span><span class="op">></span>,
}
<span class="doccomment">/// Create a new Intersperse iterator</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">intersperse</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">iter</span>: <span class="ident">I</span>, <span class="ident">elt</span>: <span class="ident">I::Item</span>) <span class="op">-</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">Iterator</span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">iter</span>.<span class="ident">fuse</span>();
<span class="ident">Intersperse</span> {
<span class="ident">peek</span>: <span class="ident">iter</span>.<span class="ident">next</span>(),
<span class="ident">iter</span>: <span class="ident">iter</span>,
<span class="ident">element</span>: <span class="ident">elt</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">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">Iterator</span>,
<span class="ident">I::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::Item</span>;
<span class="attribute">#[<span class="ident">inline</span>]</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="ident">I::Item</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">peek</span>.<span class="ident">is_some</span>() {
<span class="self">self</span>.<span class="ident">peek</span>.<span class="ident">take</span>()
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">peek</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>();
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">peek</span>.<span class="ident">is_some</span>() {
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">element</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="comment">// 2 * SH + { 1 or 0 }</span>
<span class="kw">let</span> <span class="ident">has_peek</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">peek</span>.<span class="ident">is_some</span>() <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">sh</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>();
<span class="ident">size_hint::add_scalar</span>(<span class="ident">size_hint::add</span>(<span class="ident">sh</span>, <span class="ident">sh</span>), <span class="ident">has_peek</span>)
}
}
</pre></div>
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