<!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/zip_eq_impl.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>zip_eq_impl.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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<span class="kw">use</span> <span class="kw">super</span><span class="ident">::size_hint</span>;
<span class="doccomment">/// An iterator which iterates two other iterators simultaneously</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See [`.zip_eq()`](../trait.Itertools.html#method.zip_eq) for more information.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</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="kw">pub</span> <span class="kw">struct</span> <span class="ident">ZipEq</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">J</span><span class="op">></span> {
<span class="ident">a</span>: <span class="ident">I</span>,
<span class="ident">b</span>: <span class="ident">J</span>,
}
<span class="doccomment">/// Iterate `i` and `j` in lock step.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if the iterators are not of the same length.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `IntoIterator` enabled version of `i.zip_eq(j)`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use itertools::zip_eq;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = [1, 2, 3, 4, 5];</span>
<span class="doccomment">/// for (a, b) in zip_eq(&data[..data.len() - 1], &data[1..]) {</span>
<span class="doccomment">/// /* loop body */</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">zip_eq</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">J</span><span class="op">></span>(<span class="ident">i</span>: <span class="ident">I</span>, <span class="ident">j</span>: <span class="ident">J</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ZipEq</span><span class="op"><</span><span class="ident">I::IntoIter</span>, <span class="ident">J::IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">IntoIterator</span>,
<span class="ident">J</span>: <span class="ident">IntoIterator</span>
{
<span class="ident">ZipEq</span> {
<span class="ident">a</span>: <span class="ident">i</span>.<span class="ident">into_iter</span>(),
<span class="ident">b</span>: <span class="ident">j</span>.<span class="ident">into_iter</span>(),
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">J</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">ZipEq</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">J</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">Iterator</span>,
<span class="ident">J</span>: <span class="ident">Iterator</span>
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="ident">I::Item</span>, <span class="ident">J::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">match</span> (<span class="self">self</span>.<span class="ident">a</span>.<span class="ident">next</span>(), <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">next</span>()) {
(<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
(<span class="prelude-val">Some</span>(<span class="ident">a</span>), <span class="prelude-val">Some</span>(<span class="ident">b</span>)) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>((<span class="ident">a</span>, <span class="ident">b</span>)),
(<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="kw">_</span>)) <span class="op">|</span> (<span class="prelude-val">Some</span>(<span class="kw">_</span>), <span class="prelude-val">None</span>) <span class="op">=</span><span class="op">></span>
<span class="macro">panic!</span>(<span class="string">"itertools: .zip_eq() reached end of one iterator before the other"</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="ident">size_hint::min</span>(<span class="self">self</span>.<span class="ident">a</span>.<span class="ident">size_hint</span>(), <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">size_hint</span>())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">J</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">ZipEq</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">J</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">ExactSizeIterator</span>,
<span class="ident">J</span>: <span class="ident">ExactSizeIterator</span>
{}
</pre></div>
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