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<span class="doccomment">//! Parallel iterator types for [results][std::result]</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! You will rarely need to interact with this module directly unless you need</span>
<span class="doccomment">//! to name one of the iterator types.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [std::result]: https://doc.rust-lang.org/stable/std/result/</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="ident">std::sync::Mutex</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::option</span>;
<span class="doccomment">/// Parallel iterator over a result</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">Send</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">option::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">Send</span>, <span class="ident">E</span><span class="op">></span> <span class="ident">IntoParallelIterator</span> <span class="kw">for</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">E</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="self">self</span>.<span class="ident">ok</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">Send</span><span class="op">></span>
}
<span class="doccomment">/// Parallel iterator over an immutable reference to a result</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">Sync</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">option::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">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="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Sync</span>, <span class="ident">E</span><span class="op">></span> <span class="ident">IntoParallelIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">Iter</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">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">Iter</span> {
<span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">as_ref</span>().<span class="ident">ok</span>().<span class="ident">into_par_iter</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">Sync</span> <span class="op">+</span> <span class="lifetime">'a</span><span class="op">></span>
}
<span class="doccomment">/// Parallel iterator over a mutable reference to a result</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">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">option::IntoIter</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</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">Send</span>, <span class="ident">E</span><span class="op">></span> <span class="ident">IntoParallelIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">Iter</span> <span class="op">=</span> <span class="ident">IterMut</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">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">IterMut</span> {
<span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">as_mut</span>().<span class="ident">ok</span>().<span class="ident">into_par_iter</span>(),
}
}
}
<span class="macro">delegate_indexed_iterator!</span> {
<span class="ident">IterMut</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="kw-2">mut</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">Send</span> <span class="op">+</span> <span class="lifetime">'a</span><span class="op">></span>
}
<span class="doccomment">/// Collect an arbitrary `Result`-wrapped collection.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If any item is `Err`, then all previous `Ok` items collected are</span>
<span class="doccomment">/// discarded, and it returns that error. If there are multiple errors, the</span>
<span class="doccomment">/// one returned is not deterministic.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">T</span>, <span class="ident">E</span><span class="op">></span> <span class="ident">FromParallelIterator</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">C</span>, <span class="ident">E</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">C</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="ident">E</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="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">></span><span class="op">></span>,
{
<span class="kw">fn</span> <span class="ident">ok</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">></span>(<span class="ident">saved</span>: <span class="kw-2">&</span><span class="ident">Mutex</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">E</span><span class="op">></span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="kw">impl</span> <span class="ident">Fn</span>(<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="op">+</span> <span class="lifetime">'_</span> {
<span class="kw">move</span> <span class="op">|</span><span class="ident">item</span><span class="op">|</span> <span class="kw">match</span> <span class="ident">item</span> {
<span class="prelude-val">Ok</span>(<span class="ident">item</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">item</span>),
<span class="prelude-val">Err</span>(<span class="ident">error</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// We don't need a blocking `lock()`, as anybody</span>
<span class="comment">// else holding the lock will also be writing</span>
<span class="comment">// `Some(error)`, and then ours is irrelevant.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="kw-2">mut</span> <span class="ident">guard</span>) <span class="op">=</span> <span class="ident">saved</span>.<span class="ident">try_lock</span>() {
<span class="kw">if</span> <span class="ident">guard</span>.<span class="ident">is_none</span>() {
<span class="kw-2">*</span><span class="ident">guard</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">error</span>);
}
}
<span class="prelude-val">None</span>
}
}
}
<span class="kw">let</span> <span class="ident">saved_error</span> <span class="op">=</span> <span class="ident">Mutex::new</span>(<span class="prelude-val">None</span>);
<span class="kw">let</span> <span class="ident">collection</span> <span class="op">=</span> <span class="ident">par_iter</span>
.<span class="ident">into_par_iter</span>()
.<span class="ident">map</span>(<span class="ident">ok</span>(<span class="kw-2">&</span><span class="ident">saved_error</span>))
.<span class="ident">while_some</span>()
.<span class="ident">collect</span>();
<span class="kw">match</span> <span class="ident">saved_error</span>.<span class="ident">into_inner</span>().<span class="ident">unwrap</span>() {
<span class="prelude-val">Some</span>(<span class="ident">error</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">error</span>),
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">collection</span>),
}
}
}
</pre></div>
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