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