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</pre><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::iter</span>;
<span class="kw">use</span> <span class="ident">std::ops::Range</span>;
<span class="kw">use</span> <span class="ident">std::usize</span>;
<span class="doccomment">/// `Enumerate` is an iterator that returns the current count along with the element.</span>
<span class="doccomment">/// This struct is created by the [`enumerate()`] method on [`IndexedParallelIterator`]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`enumerate()`]: trait.IndexedParallelIterator.html#method.enumerate</span>
<span class="doccomment">/// [`IndexedParallelIterator`]: trait.IndexedParallelIterator.html</span>
<span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"iterator adaptors are lazy and do nothing unless consumed"</span>]</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">Enumerate</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IndexedParallelIterator</span><span class="op">></span> {
<span class="ident">base</span>: <span class="ident">I</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="ident">Enumerate</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IndexedParallelIterator</span>,
{
<span class="doccomment">/// Creates a new `Enumerate` iterator.</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">base</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">Enumerate</span> { <span class="ident">base</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="ident">ParallelIterator</span> <span class="kw">for</span> <span class="ident">Enumerate</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IndexedParallelIterator</span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="ident">usize</span>, <span class="ident">I::Item</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="ident">I</span><span class="op">></span> <span class="ident">IndexedParallelIterator</span> <span class="kw">for</span> <span class="ident">Enumerate</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">IndexedParallelIterator</span>,
{
<span class="kw">fn</span> <span class="ident">drive</span><span class="op"><</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="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="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">base</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">return</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">with_producer</span>(<span class="ident">Callback</span> { <span class="ident">callback</span> });
<span class="kw">struct</span> <span class="ident">Callback</span><span class="op"><</span><span class="ident">CB</span><span class="op">></span> {
<span class="ident">callback</span>: <span class="ident">CB</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">CB</span><span class="op">></span> <span class="ident">ProducerCallback</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Callback</span><span class="op"><</span><span class="ident">CB</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">CB</span>: <span class="ident">ProducerCallback</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">I</span>)<span class="op">></span>,
{
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">CB::Output</span>;
<span class="kw">fn</span> <span class="ident">callback</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">base</span>: <span class="ident">P</span>) <span class="op">-</span><span class="op">></span> <span class="ident">CB::Output</span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">Producer</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">I</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="ident">producer</span> <span class="op">=</span> <span class="ident">EnumerateProducer</span> { <span class="ident">base</span>, <span class="ident">offset</span>: <span class="number">0</span> };
<span class="self">self</span>.<span class="ident">callback</span>.<span class="ident">callback</span>(<span class="ident">producer</span>)
}
}
}
}
<span class="doccomment">/// ////////////////////////////////////////////////////////////////////////</span>
<span class="doccomment">/// Producer implementation</span>
<span class="kw">struct</span> <span class="ident">EnumerateProducer</span><span class="op"><</span><span class="ident">P</span><span class="op">></span> {
<span class="ident">base</span>: <span class="ident">P</span>,
<span class="ident">offset</span>: <span class="ident">usize</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">P</span><span class="op">></span> <span class="ident">Producer</span> <span class="kw">for</span> <span class="ident">EnumerateProducer</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">Producer</span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="ident">usize</span>, <span class="ident">P::Item</span>);
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">iter::Zip</span><span class="op"><</span><span class="ident">Range</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>, <span class="ident">P::IntoIter</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="comment">// Enumerate only works for IndexedParallelIterators. Since those</span>
<span class="comment">// have a max length of usize::MAX, their max index is</span>
<span class="comment">// usize::MAX - 1, so the range 0..usize::MAX includes all</span>
<span class="comment">// possible indices.</span>
<span class="comment">//</span>
<span class="comment">// However, we should to use a precise end to the range, otherwise</span>
<span class="comment">// reversing the iterator may have to walk back a long ways before</span>
<span class="comment">// `Zip::next_back` can produce anything.</span>
<span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">into_iter</span>();
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">offset</span> <span class="op">+</span> <span class="ident">base</span>.<span class="ident">len</span>();
(<span class="self">self</span>.<span class="ident">offset</span>..<span class="ident">end</span>).<span class="ident">zip</span>(<span class="ident">base</span>)
}
<span class="kw">fn</span> <span class="ident">min_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">base</span>.<span class="ident">min_len</span>()
}
<span class="kw">fn</span> <span class="ident">max_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">base</span>.<span class="ident">max_len</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="kw">let</span> (<span class="ident">left</span>, <span class="ident">right</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">base</span>.<span class="ident">split_at</span>(<span class="ident">index</span>);
(
<span class="ident">EnumerateProducer</span> {
<span class="ident">base</span>: <span class="ident">left</span>,
<span class="ident">offset</span>: <span class="self">self</span>.<span class="ident">offset</span>,
},
<span class="ident">EnumerateProducer</span> {
<span class="ident">base</span>: <span class="ident">right</span>,
<span class="ident">offset</span>: <span class="self">self</span>.<span class="ident">offset</span> <span class="op">+</span> <span class="ident">index</span>,
},
)
}
}
</pre></div>
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