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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::plumbing::<span class="kw-2">*</span>; |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span>std::fmt::{<span class="self">self</span>, Debug}; |
| |
| <span class="doccomment">/// `FlatMap` maps each element to a parallel iterator, then flattens these iterators together. |
| /// This struct is created by the [`flat_map()`] method on [`ParallelIterator`] |
| /// |
| /// [`flat_map()`]: trait.ParallelIterator.html#method.flat_map |
| /// [`ParallelIterator`]: trait.ParallelIterator.html |
| </span><span class="attribute">#[must_use = <span class="string">"iterator adaptors are lazy and do nothing unless consumed"</span>] |
| #[derive(Clone)] |
| </span><span class="kw">pub struct </span>FlatMap<I: ParallelIterator, F> { |
| base: I, |
| map_op: F, |
| } |
| |
| <span class="kw">impl</span><I: ParallelIterator + Debug, F> Debug <span class="kw">for </span>FlatMap<I, F> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.debug_struct(<span class="string">"FlatMap"</span>).field(<span class="string">"base"</span>, <span class="kw-2">&</span><span class="self">self</span>.base).finish() |
| } |
| } |
| |
| <span class="kw">impl</span><I: ParallelIterator, F> FlatMap<I, F> { |
| <span class="doccomment">/// Creates a new `FlatMap` iterator. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(base: I, map_op: F) -> <span class="self">Self </span>{ |
| FlatMap { base, map_op } |
| } |
| } |
| |
| <span class="kw">impl</span><I, F, PI> ParallelIterator <span class="kw">for </span>FlatMap<I, F> |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| F: Fn(I::Item) -> PI + Sync + Send, |
| PI: IntoParallelIterator, |
| { |
| <span class="kw">type </span>Item = PI::Item; |
| |
| <span class="kw">fn </span>drive_unindexed<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="self">Self</span>::Item>, |
| { |
| <span class="kw">let </span>consumer = FlatMapConsumer::new(consumer, <span class="kw-2">&</span><span class="self">self</span>.map_op); |
| <span class="self">self</span>.base.drive_unindexed(consumer) |
| } |
| } |
| |
| <span class="doccomment">/// //////////////////////////////////////////////////////////////////////// |
| /// Consumer implementation |
| |
| </span><span class="kw">struct </span>FlatMapConsumer<<span class="lifetime">'f</span>, C, F> { |
| base: C, |
| map_op: <span class="kw-2">&</span><span class="lifetime">'f </span>F, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'f</span>, C, F> FlatMapConsumer<<span class="lifetime">'f</span>, C, F> { |
| <span class="kw">fn </span>new(base: C, map_op: <span class="kw-2">&</span><span class="lifetime">'f </span>F) -> <span class="self">Self </span>{ |
| FlatMapConsumer { base, map_op } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'f</span>, T, U, C, F> Consumer<T> <span class="kw">for </span>FlatMapConsumer<<span class="lifetime">'f</span>, C, F> |
| <span class="kw">where |
| </span>C: UnindexedConsumer<U::Item>, |
| F: Fn(T) -> U + Sync, |
| U: IntoParallelIterator, |
| { |
| <span class="kw">type </span>Folder = FlatMapFolder<<span class="lifetime">'f</span>, C, F, C::Result>; |
| <span class="kw">type </span>Reducer = C::Reducer; |
| <span class="kw">type </span><span class="prelude-ty">Result </span>= C::Result; |
| |
| <span class="kw">fn </span>split_at(<span class="self">self</span>, index: usize) -> (<span class="self">Self</span>, <span class="self">Self</span>, C::Reducer) { |
| <span class="kw">let </span>(left, right, reducer) = <span class="self">self</span>.base.split_at(index); |
| ( |
| FlatMapConsumer::new(left, <span class="self">self</span>.map_op), |
| FlatMapConsumer::new(right, <span class="self">self</span>.map_op), |
| reducer, |
| ) |
| } |
| |
| <span class="kw">fn </span>into_folder(<span class="self">self</span>) -> <span class="self">Self</span>::Folder { |
| FlatMapFolder { |
| base: <span class="self">self</span>.base, |
| map_op: <span class="self">self</span>.map_op, |
| previous: <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>full(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.base.full() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'f</span>, T, U, C, F> UnindexedConsumer<T> <span class="kw">for </span>FlatMapConsumer<<span class="lifetime">'f</span>, C, F> |
| <span class="kw">where |
| </span>C: UnindexedConsumer<U::Item>, |
| F: Fn(T) -> U + Sync, |
| U: IntoParallelIterator, |
| { |
| <span class="kw">fn </span>split_off_left(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| FlatMapConsumer::new(<span class="self">self</span>.base.split_off_left(), <span class="self">self</span>.map_op) |
| } |
| |
| <span class="kw">fn </span>to_reducer(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Reducer { |
| <span class="self">self</span>.base.to_reducer() |
| } |
| } |
| |
| <span class="kw">struct </span>FlatMapFolder<<span class="lifetime">'f</span>, C, F, R> { |
| base: C, |
| map_op: <span class="kw-2">&</span><span class="lifetime">'f </span>F, |
| previous: <span class="prelude-ty">Option</span><R>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'f</span>, T, U, C, F> Folder<T> <span class="kw">for </span>FlatMapFolder<<span class="lifetime">'f</span>, C, F, C::Result> |
| <span class="kw">where |
| </span>C: UnindexedConsumer<U::Item>, |
| F: Fn(T) -> U + Sync, |
| U: IntoParallelIterator, |
| { |
| <span class="kw">type </span><span class="prelude-ty">Result </span>= C::Result; |
| |
| <span class="kw">fn </span>consume(<span class="self">self</span>, item: T) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>map_op = <span class="self">self</span>.map_op; |
| <span class="kw">let </span>par_iter = map_op(item).into_par_iter(); |
| <span class="kw">let </span>consumer = <span class="self">self</span>.base.split_off_left(); |
| <span class="kw">let </span>result = par_iter.drive_unindexed(consumer); |
| |
| <span class="kw">let </span>previous = <span class="kw">match </span><span class="self">self</span>.previous { |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Some</span>(result), |
| <span class="prelude-val">Some</span>(previous) => { |
| <span class="kw">let </span>reducer = <span class="self">self</span>.base.to_reducer(); |
| <span class="prelude-val">Some</span>(reducer.reduce(previous, result)) |
| } |
| }; |
| |
| FlatMapFolder { |
| base: <span class="self">self</span>.base, |
| map_op, |
| previous, |
| } |
| } |
| |
| <span class="kw">fn </span>complete(<span class="self">self</span>) -> <span class="self">Self</span>::Result { |
| <span class="kw">match </span><span class="self">self</span>.previous { |
| <span class="prelude-val">Some</span>(previous) => previous, |
| <span class="prelude-val">None </span>=> <span class="self">self</span>.base.into_folder().complete(), |
| } |
| } |
| |
| <span class="kw">fn </span>full(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.base.full() |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rayon" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |