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</pre><pre class="rust">
<span class="kw">use</span> <span class="kw">super</span><span class="ident">::noop::NoopConsumer</span>;
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">FromParallelIterator</span>, <span class="ident">IntoParallelIterator</span>, <span class="ident">ParallelExtend</span>, <span class="ident">ParallelIterator</span>};
<span class="kw">use</span> <span class="ident">std::borrow::Cow</span>;
<span class="kw">use</span> <span class="ident">std::collections::LinkedList</span>;
<span class="kw">use</span> <span class="ident">std::collections</span>::{<span class="ident">BTreeMap</span>, <span class="ident">BTreeSet</span>, <span class="ident">HashMap</span>, <span class="ident">HashSet</span>};
<span class="kw">use</span> <span class="ident">std::collections</span>::{<span class="ident">BinaryHeap</span>, <span class="ident">VecDeque</span>};
<span class="kw">use</span> <span class="ident">std::hash</span>::{<span class="ident">BuildHasher</span>, <span class="ident">Hash</span>};
<span class="doccomment">/// Creates an empty default collection and extends it.</span>
<span class="kw">fn</span> <span class="ident">collect_extended</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="ident">C</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span>,
<span class="ident">C</span>: <span class="ident">ParallelExtend</span><span class="op"><</span><span class="ident">I::Item</span><span class="op">></span> <span class="op">+</span> <span class="ident">Default</span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">collection</span> <span class="op">=</span> <span class="ident">C::default</span>();
<span class="ident">collection</span>.<span class="ident">par_extend</span>(<span class="ident">par_iter</span>);
<span class="ident">collection</span>
}
<span class="doccomment">/// Collects items from a parallel iterator into a vector.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</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">Send</span>,
{
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects items from a parallel iterator into a vecdeque.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">VecDeque</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">Send</span>,
{
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>,
{
<span class="ident">Vec::from_par_iter</span>(<span class="ident">par_iter</span>).<span class="ident">into</span>()
}
}
<span class="doccomment">/// Collects items from a parallel iterator into a binaryheap.</span>
<span class="doccomment">/// The heap-ordering is calculated serially after all items are collected.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">T</span><span class="op">></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">where</span>
<span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Send</span>,
{
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>,
{
<span class="ident">Vec::from_par_iter</span>(<span class="ident">par_iter</span>).<span class="ident">into</span>()
}
}
<span class="doccomment">/// Collects items from a parallel iterator into a freshly allocated</span>
<span class="doccomment">/// linked list.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">LinkedList</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">Send</span>,
{
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects (key, value) pairs from a parallel iterator into a</span>
<span class="doccomment">/// hashmap. If multiple pairs correspond to the same key, then the</span>
<span class="doccomment">/// ones produced earlier in the parallel iterator will be</span>
<span class="doccomment">/// overwritten, just as with a sequential iterator.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span>(<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">></span> <span class="kw">for</span> <span class="ident">HashMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">K</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">V</span>: <span class="ident">Send</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span> <span class="op">+</span> <span class="ident">Default</span> <span class="op">+</span> <span class="ident">Send</span>,
{
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> (<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects (key, value) pairs from a parallel iterator into a</span>
<span class="doccomment">/// btreemap. If multiple pairs correspond to the same key, then the</span>
<span class="doccomment">/// ones produced earlier in the parallel iterator will be</span>
<span class="doccomment">/// overwritten, just as with a sequential iterator.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span>(<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">></span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">K</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">V</span>: <span class="ident">Send</span>,
{
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> (<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects values from a parallel iterator into a hashset.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">V</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">V</span><span class="op">></span> <span class="kw">for</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">V</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">V</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span> <span class="op">+</span> <span class="ident">Default</span> <span class="op">+</span> <span class="ident">Send</span>,
{
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">V</span><span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects values from a parallel iterator into a btreeset.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">V</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">V</span><span class="op">></span> <span class="kw">for</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">V</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">V</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Ord</span>,
{
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">V</span><span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects characters from a parallel iterator into a string.</span>
<span class="kw">impl</span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">String</span> {
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span><span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects characters from a parallel iterator into a string.</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">String</span> {
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">char</span><span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects string slices from a parallel iterator into a string.</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> <span class="kw">for</span> <span class="ident">String</span> {
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects strings from a parallel iterator into one large string.</span>
<span class="kw">impl</span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> <span class="kw">for</span> <span class="ident">String</span> {
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">String</span><span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects string slices from a parallel iterator into a string.</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">str</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">String</span> {
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">str</span><span class="op">></span><span class="op">></span>,
{
<span class="ident">collect_extended</span>(<span class="ident">par_iter</span>)
}
}
<span class="doccomment">/// Collects an arbitrary `Cow` collection.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note, the standard library only has `FromIterator` for `Cow<'a, str>` and</span>
<span class="doccomment">/// `Cow<'a, [T]>`, because no one thought to add a blanket implementation</span>
<span class="doccomment">/// before it was stabilized.</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">C</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">C</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">C</span>: <span class="ident">ToOwned</span>,
<span class="ident">C::Owned</span>: <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
<span class="ident">T</span>: <span class="ident">Send</span>,
{
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>,
{
<span class="ident">Cow::Owned</span>(<span class="ident">C::Owned::from_par_iter</span>(<span class="ident">par_iter</span>))
}
}
<span class="doccomment">/// Collapses all unit items from a parallel iterator into one.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is more useful when combined with higher-level abstractions, like</span>
<span class="doccomment">/// collecting to a `Result<(), E>` where you only care about errors:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::*;</span>
<span class="doccomment">/// use rayon::prelude::*;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = vec![1, 2, 3, 4, 5];</span>
<span class="doccomment">/// let res: Result<()> = data.par_iter()</span>
<span class="doccomment">/// .map(|x| writeln!(stdout(), "{}", x))</span>
<span class="doccomment">/// .collect();</span>
<span class="doccomment">/// assert!(res.is_ok());</span>
<span class="doccomment">/// ```</span>
<span class="kw">impl</span> <span class="ident">FromParallelIterator</span><span class="op"><</span>()<span class="op">></span> <span class="kw">for</span> () {
<span class="kw">fn</span> <span class="ident">from_par_iter</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="ident">par_iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IntoParallelIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> ()<span class="op">></span>,
{
<span class="ident">par_iter</span>.<span class="ident">into_par_iter</span>().<span class="ident">drive_unindexed</span>(<span class="ident">NoopConsumer</span>)
}
}
</pre></div>
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