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id="230">230</span> <span id="231">231</span> <span id="232">232</span> <span id="233">233</span> <span id="234">234</span> <span id="235">235</span> <span id="236">236</span> <span id="237">237</span> <span id="238">238</span> <span id="239">239</span> <span id="240">240</span> <span id="241">241</span> </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">iter</span>; <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">usize</span>; <span class="doccomment">/// Iterator adaptor for [the `repeat()` function](fn.repeat.html).</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Repeat</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="op">></span> { <span class="ident">element</span>: <span class="ident">T</span>, } <span class="doccomment">/// Creates a parallel iterator that endlessly repeats `elt` (by</span> <span class="doccomment">/// cloning it). Note that this iterator has "infinite" length, so</span> <span class="doccomment">/// typically you would want to use `zip` or `take` or some other</span> <span class="doccomment">/// means to shorten it, or consider using</span> <span class="doccomment">/// [the `repeatn()` function](fn.repeatn.html) instead.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use rayon::prelude::*;</span> <span class="doccomment">/// use rayon::iter::repeat;</span> <span class="doccomment">/// let x: Vec<(i32, i32)> = repeat(22).zip(0..3).collect();</span> <span class="doccomment">/// assert_eq!(x, vec![(22, 0), (22, 1), (22, 2)]);</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">repeat</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="op">></span>(<span class="ident">elt</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Repeat</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">Repeat</span> { <span class="ident">element</span>: <span class="ident">elt</span> } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Repeat</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">Send</span>, { <span class="doccomment">/// Take only `n` repeats of the element, similar to the general</span> <span class="doccomment">/// [`take()`](trait.IndexedParallelIterator.html#method.take).</span> <span class="doccomment">///</span> <span class="doccomment">/// The resulting `RepeatN` is an `IndexedParallelIterator`, allowing</span> <span class="doccomment">/// more functionality than `Repeat` alone.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">take</span>(<span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RepeatN</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">repeatn</span>(<span class="self">self</span>.<span class="ident">element</span>, <span class="ident">n</span>) } <span class="doccomment">/// Iterate tuples repeating the element with items from another</span> <span class="doccomment">/// iterator, similar to the general</span> <span class="doccomment">/// [`zip()`](trait.IndexedParallelIterator.html#method.zip).</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">zip</span><span class="op"><</span><span class="ident">Z</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">zip_op</span>: <span class="ident">Z</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Zip</span><span class="op"><</span><span class="ident">RepeatN</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">Z</span>::<span class="ident">Iter</span><span class="op">></span> <span class="kw">where</span> <span class="ident">Z</span>: <span class="ident">IntoParallelIterator</span>, <span class="ident">Z</span>::<span class="ident">Iter</span>: <span class="ident">IndexedParallelIterator</span>, { <span class="kw">let</span> <span class="ident">z</span> <span class="op">=</span> <span class="ident">zip_op</span>.<span class="ident">into_par_iter</span>(); <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">z</span>.<span class="ident">len</span>(); <span class="self">self</span>.<span class="ident">take</span>(<span class="ident">n</span>).<span class="ident">zip</span>(<span class="ident">z</span>) } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">ParallelIterator</span> <span class="kw">for</span> <span class="ident">Repeat</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">where</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">Item</span> <span class="op">=</span> <span class="ident">T</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="self">Self</span>::<span class="ident">Item</span><span class="op">></span>, { <span class="kw">let</span> <span class="ident">producer</span> <span class="op">=</span> <span class="ident">RepeatProducer</span> { <span class="ident">element</span>: <span class="self">self</span>.<span class="ident">element</span>, }; <span class="ident">bridge_unindexed</span>(<span class="ident">producer</span>, <span class="ident">consumer</span>) } } <span class="doccomment">/// Unindexed producer for `Repeat`.</span> <span class="kw">struct</span> <span class="ident">RepeatProducer</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="op">></span> { <span class="ident">element</span>: <span class="ident">T</span>, } <span class="kw">impl</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="op">></span> <span class="ident">UnindexedProducer</span> <span class="kw">for</span> <span class="ident">RepeatProducer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>; <span class="kw">fn</span> <span class="ident">split</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="self">Self</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>) { ( <span class="ident">RepeatProducer</span> { <span class="ident">element</span>: <span class="self">self</span>.<span class="ident">element</span>.<span class="ident">clone</span>(), }, <span class="prelude-val">Some</span>(<span class="ident">RepeatProducer</span> { <span class="ident">element</span>: <span class="self">self</span>.<span class="ident">element</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="ident">T</span><span class="op">></span>, { <span class="ident">folder</span>.<span class="ident">consume_iter</span>(<span class="ident">iter</span>::<span class="ident">repeat</span>(<span class="self">self</span>.<span class="ident">element</span>)) } } <span class="doccomment">/// Iterator adaptor for [the `repeatn()` function](fn.repeatn.html).</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RepeatN</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="op">></span> { <span class="ident">element</span>: <span class="ident">T</span>, <span class="ident">count</span>: <span class="ident">usize</span>, } <span class="doccomment">/// Creates a parallel iterator that produces `n` repeats of `elt`</span> <span class="doccomment">/// (by cloning it).</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use rayon::prelude::*;</span> <span class="doccomment">/// use rayon::iter::repeatn;</span> <span class="doccomment">/// let x: Vec<(i32, i32)> = repeatn(22, 3).zip(0..3).collect();</span> <span class="doccomment">/// assert_eq!(x, vec![(22, 0), (22, 1), (22, 2)]);</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">repeatn</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="op">></span>(<span class="ident">elt</span>: <span class="ident">T</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RepeatN</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">RepeatN</span> { <span class="ident">element</span>: <span class="ident">elt</span>, <span class="ident">count</span>: <span class="ident">n</span>, } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">ParallelIterator</span> <span class="kw">for</span> <span class="ident">RepeatN</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">where</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">Item</span> <span class="op">=</span> <span class="ident">T</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="self">Self</span>::<span class="ident">Item</span><span class="op">></span>, { <span class="ident">bridge</span>(<span class="self">self</span>, <span class="ident">consumer</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="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">count</span>) } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IndexedParallelIterator</span> <span class="kw">for</span> <span class="ident">RepeatN</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">where</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">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="ident">bridge</span>(<span class="self">self</span>, <span class="ident">consumer</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="ident">callback</span>.<span class="ident">callback</span>(<span class="ident">RepeatNProducer</span> { <span class="ident">element</span>: <span class="self">self</span>.<span class="ident">element</span>, <span class="ident">count</span>: <span class="self">self</span>.<span class="ident">count</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="self">self</span>.<span class="ident">count</span> } } <span class="doccomment">/// Producer for `RepeatN`.</span> <span class="kw">struct</span> <span class="ident">RepeatNProducer</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="op">></span> { <span class="ident">element</span>: <span class="ident">T</span>, <span class="ident">count</span>: <span class="ident">usize</span>, } <span class="kw">impl</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="op">></span> <span class="ident">Producer</span> <span class="kw">for</span> <span class="ident">RepeatNProducer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>; <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</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">Iter</span> { <span class="ident">element</span>: <span class="self">self</span>.<span class="ident">element</span>, <span class="ident">count</span>: <span class="self">self</span>.<span class="ident">count</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="ident">RepeatNProducer</span> { <span class="ident">element</span>: <span class="self">self</span>.<span class="ident">element</span>.<span class="ident">clone</span>(), <span class="ident">count</span>: <span class="ident">index</span>, }, <span class="ident">RepeatNProducer</span> { <span class="ident">element</span>: <span class="self">self</span>.<span class="ident">element</span>, <span class="ident">count</span>: <span class="self">self</span>.<span class="ident">count</span> <span class="op">-</span> <span class="ident">index</span>, }, ) } } <span class="doccomment">/// Iterator for `RepeatN`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This is conceptually like `std::iter::Take<std::iter::Repeat<T>>`, but</span> <span class="doccomment">/// we need `DoubleEndedIterator` and unconditional `ExactSizeIterator`.</span> <span class="kw">struct</span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> { <span class="ident">element</span>: <span class="ident">T</span>, <span class="ident">count</span>: <span class="ident">usize</span>, } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</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">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">count</span> <span class="op">></span> <span class="number">0</span> { <span class="self">self</span>.<span class="ident">count</span> <span class="op">-</span><span class="op">=</span> <span class="number">1</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="attribute">#[<span class="ident">inline</span>]</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="self">self</span>.<span class="ident">count</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">count</span>)) } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</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="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">next</span>() } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</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="self">self</span>.<span class="ident">count</span> } } </pre></div> </section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../../";window.currentCrate = "rayon";</script><script src="../../../aliases.js"></script><script src="../../../main.js"></script><script src="../../../source-script.js"></script><script src="../../../source-files.js"></script><script defer src="../../../search-index.js"></script></body></html>