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</pre><pre class="rust">
<span class="doccomment">//! This module contains the parallel iterator types for heaps</span>
<span class="doccomment">//! (`BinaryHeap<T>`). You will rarely need to interact with it directly</span>
<span class="doccomment">//! unless you have need to name one of the iterator types.</span>
<span class="kw">use</span> <span class="ident">std::collections::BinaryHeap</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::iter::plumbing</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::iter</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::vec</span>;
<span class="doccomment">/// Parallel iterator over a binary heap</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">IntoIter</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">vec::IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span> <span class="ident">IntoParallelIterator</span> <span class="kw">for</span> <span class="ident">BinaryHeap</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">Iter</span> <span class="op">=</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">into_par_iter</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span><span class="ident">::Iter</span> {
<span class="ident">IntoIter</span> {
<span class="ident">inner</span>: <span class="ident">Vec::from</span>(<span class="self">self</span>).<span class="ident">into_par_iter</span>(),
}
}
}
<span class="macro">delegate_indexed_iterator!</span> {
<span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="op">=</span><span class="op">></span> <span class="ident">T</span>,
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span>
}
<span class="doccomment">/// Parallel iterator over an immutable reference to a binary heap</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">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">vec::IntoIter</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">Iter</span> {
<span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clone</span>(),
}
}
}
<span class="macro">into_par_vec!</span> {
<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">BinaryHeap</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="op">=</span><span class="op">></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>,
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">></span>
}
<span class="macro">delegate_indexed_iterator!</span> {
<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="op">=</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>,
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="lifetime">'a</span><span class="op">></span>
}
<span class="comment">// `BinaryHeap` doesn't have a mutable `Iterator`</span>
<span class="doccomment">/// Draining parallel iterator that moves out of a binary heap,</span>
<span class="doccomment">/// but keeps the total capacity.</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">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span> {
<span class="ident">heap</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">BinaryHeap</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span> <span class="ident">ParallelDrainFull</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">BinaryHeap</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Iter</span> <span class="op">=</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</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">par_drain</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span><span class="ident">::Iter</span> {
<span class="ident">Drain</span> { <span class="ident">heap</span>: <span class="self">self</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span> <span class="ident">ParallelIterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</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">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::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">len</span>())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span> <span class="ident">IndexedParallelIterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></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::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">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">heap</span>.<span class="ident">len</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::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="kw">super</span><span class="ident">::DrainGuard::new</span>(<span class="self">self</span>.<span class="ident">heap</span>)
.<span class="ident">par_drain</span>(..)
.<span class="ident">with_producer</span>(<span class="ident">callback</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">heap</span>.<span class="ident">is_empty</span>() {
<span class="comment">// We must not have produced, so just call a normal drain to remove the items.</span>
<span class="self">self</span>.<span class="ident">heap</span>.<span class="ident">drain</span>();
}
}
}
</pre></div>
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