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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::sync::atomic::{AtomicBool, Ordering};
<span class="doccomment">/// `WhileSome` is an iterator that yields the `Some` elements of an iterator,
/// halting as soon as any `None` is produced.
///
/// This struct is created by the [`while_some()`] method on [`ParallelIterator`]
///
/// [`while_some()`]: trait.ParallelIterator.html#method.while_some
/// [`ParallelIterator`]: trait.ParallelIterator.html
</span><span class="attribute">#[must_use = <span class="string">&quot;iterator adaptors are lazy and do nothing unless consumed&quot;</span>]
#[derive(Debug, Clone)]
</span><span class="kw">pub struct </span>WhileSome&lt;I: ParallelIterator&gt; {
base: I,
}
<span class="kw">impl</span>&lt;I&gt; WhileSome&lt;I&gt;
<span class="kw">where
</span>I: ParallelIterator,
{
<span class="doccomment">/// Creates a new `WhileSome` iterator.
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(base: I) -&gt; <span class="self">Self </span>{
WhileSome { base }
}
}
<span class="kw">impl</span>&lt;I, T&gt; ParallelIterator <span class="kw">for </span>WhileSome&lt;I&gt;
<span class="kw">where
</span>I: ParallelIterator&lt;Item = <span class="prelude-ty">Option</span>&lt;T&gt;&gt;,
T: Send,
{
<span class="kw">type </span>Item = T;
<span class="kw">fn </span>drive_unindexed&lt;C&gt;(<span class="self">self</span>, consumer: C) -&gt; C::Result
<span class="kw">where
</span>C: UnindexedConsumer&lt;<span class="self">Self</span>::Item&gt;,
{
<span class="kw">let </span>full = AtomicBool::new(<span class="bool-val">false</span>);
<span class="kw">let </span>consumer1 = WhileSomeConsumer {
base: consumer,
full: <span class="kw-2">&amp;</span>full,
};
<span class="self">self</span>.base.drive_unindexed(consumer1)
}
}
<span class="doccomment">/// ////////////////////////////////////////////////////////////////////////
/// Consumer implementation
</span><span class="kw">struct </span>WhileSomeConsumer&lt;<span class="lifetime">&#39;f</span>, C&gt; {
base: C,
full: <span class="kw-2">&amp;</span><span class="lifetime">&#39;f </span>AtomicBool,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;f</span>, T, C&gt; Consumer&lt;<span class="prelude-ty">Option</span>&lt;T&gt;&gt; <span class="kw">for </span>WhileSomeConsumer&lt;<span class="lifetime">&#39;f</span>, C&gt;
<span class="kw">where
</span>C: Consumer&lt;T&gt;,
T: Send,
{
<span class="kw">type </span>Folder = WhileSomeFolder&lt;<span class="lifetime">&#39;f</span>, C::Folder&gt;;
<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) -&gt; (<span class="self">Self</span>, <span class="self">Self</span>, <span class="self">Self</span>::Reducer) {
<span class="kw">let </span>(left, right, reducer) = <span class="self">self</span>.base.split_at(index);
(
WhileSomeConsumer { base: left, ..<span class="self">self </span>},
WhileSomeConsumer {
base: right,
..<span class="self">self
</span>},
reducer,
)
}
<span class="kw">fn </span>into_folder(<span class="self">self</span>) -&gt; <span class="self">Self</span>::Folder {
WhileSomeFolder {
base: <span class="self">self</span>.base.into_folder(),
full: <span class="self">self</span>.full,
}
}
<span class="kw">fn </span>full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.full.load(Ordering::Relaxed) || <span class="self">self</span>.base.full()
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;f</span>, T, C&gt; UnindexedConsumer&lt;<span class="prelude-ty">Option</span>&lt;T&gt;&gt; <span class="kw">for </span>WhileSomeConsumer&lt;<span class="lifetime">&#39;f</span>, C&gt;
<span class="kw">where
</span>C: UnindexedConsumer&lt;T&gt;,
T: Send,
{
<span class="kw">fn </span>split_off_left(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
WhileSomeConsumer {
base: <span class="self">self</span>.base.split_off_left(),
..<span class="kw-2">*</span><span class="self">self
</span>}
}
<span class="kw">fn </span>to_reducer(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Reducer {
<span class="self">self</span>.base.to_reducer()
}
}
<span class="kw">struct </span>WhileSomeFolder&lt;<span class="lifetime">&#39;f</span>, C&gt; {
base: C,
full: <span class="kw-2">&amp;</span><span class="lifetime">&#39;f </span>AtomicBool,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;f</span>, T, C&gt; Folder&lt;<span class="prelude-ty">Option</span>&lt;T&gt;&gt; <span class="kw">for </span>WhileSomeFolder&lt;<span class="lifetime">&#39;f</span>, C&gt;
<span class="kw">where
</span>C: Folder&lt;T&gt;,
{
<span class="kw">type </span><span class="prelude-ty">Result </span>= C::Result;
<span class="kw">fn </span>consume(<span class="kw-2">mut </span><span class="self">self</span>, item: <span class="prelude-ty">Option</span>&lt;T&gt;) -&gt; <span class="self">Self </span>{
<span class="kw">match </span>item {
<span class="prelude-val">Some</span>(item) =&gt; <span class="self">self</span>.base = <span class="self">self</span>.base.consume(item),
<span class="prelude-val">None </span>=&gt; <span class="self">self</span>.full.store(<span class="bool-val">true</span>, Ordering::Relaxed),
}
<span class="self">self
</span>}
<span class="kw">fn </span>consume_iter&lt;I&gt;(<span class="kw-2">mut </span><span class="self">self</span>, iter: I) -&gt; <span class="self">Self
</span><span class="kw">where
</span>I: IntoIterator&lt;Item = <span class="prelude-ty">Option</span>&lt;T&gt;&gt;,
{
<span class="kw">fn </span>some&lt;T&gt;(full: <span class="kw-2">&amp;</span>AtomicBool) -&gt; <span class="kw">impl </span>Fn(<span class="kw-2">&amp;</span><span class="prelude-ty">Option</span>&lt;T&gt;) -&gt; bool + <span class="lifetime">&#39;_ </span>{
<span class="kw">move </span>|x| <span class="kw">match </span><span class="kw-2">*</span>x {
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; !full.load(Ordering::Relaxed),
<span class="prelude-val">None </span>=&gt; {
full.store(<span class="bool-val">true</span>, Ordering::Relaxed);
<span class="bool-val">false
</span>}
}
}
<span class="self">self</span>.base = <span class="self">self</span>.base.consume_iter(
iter.into_iter()
.take_while(some(<span class="self">self</span>.full))
.map(Option::unwrap),
);
<span class="self">self
</span>}
<span class="kw">fn </span>complete(<span class="self">self</span>) -&gt; C::Result {
<span class="self">self</span>.base.complete()
}
<span class="kw">fn </span>full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.full.load(Ordering::Relaxed) || <span class="self">self</span>.base.full()
}
}
</code></pre></div>
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