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</pre><pre class="rust">
<span class="doccomment">//! Parallel iterator types for [inclusive ranges][std::range],</span>
<span class="doccomment">//! the type for values created by `a..=b` expressions</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! You will rarely need to interact with this module directly unless you have</span>
<span class="doccomment">//! need to name one of the iterator types.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use rayon::prelude::*;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let r = (0..=100u64).into_par_iter()</span>
<span class="doccomment">//! .sum();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // compare result with sequential calculation</span>
<span class="doccomment">//! assert_eq!((0..=100).sum::<u64>(), r);</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [std::range]: https://doc.rust-lang.org/core/ops/struct.RangeInclusive.html</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::char</span>;
<span class="kw">use</span> <span class="ident">std::ops::RangeInclusive</span>;
<span class="doccomment">/// Parallel iterator over an inclusive range, implemented for all integer types and `char`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Note:** The `zip` operation requires `IndexedParallelIterator`</span>
<span class="doccomment">/// which is only implemented for `u8`, `i8`, `u16`, `i16`, and `char`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use rayon::prelude::*;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let p = (0..=25u16).into_par_iter()</span>
<span class="doccomment">/// .zip(0..=25u16)</span>
<span class="doccomment">/// .filter(|&(x, y)| x % 5 == 0 || y % 5 == 0)</span>
<span class="doccomment">/// .map(|(x, y)| x * y)</span>
<span class="doccomment">/// .sum::<u16>();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let s = (0..=25u16).zip(0..=25u16)</span>
<span class="doccomment">/// .filter(|&(x, y)| x % 5 == 0 || y % 5 == 0)</span>
<span class="doccomment">/// .map(|(x, y)| x * y)</span>
<span class="doccomment">/// .sum();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(p, s);</span>
<span class="doccomment">/// ```</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">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">range</span>: <span class="ident">RangeInclusive</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="op">></span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">RangeInclusive</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>: <span class="ident">Eq</span>,
<span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Copy</span>,
{
<span class="doccomment">/// Returns `Some((start, end))` for `start..=end`, or `None` if it is exhausted.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that `RangeInclusive` does not specify the bounds of an exhausted iterator,</span>
<span class="doccomment">/// so this is a way for us to figure out what we've got. Thankfully, all of the</span>
<span class="doccomment">/// integer types we care about can be trivially cloned.</span>
<span class="kw">fn</span> <span class="ident">bounds</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">T</span>, <span class="ident">T</span>)<span class="op">></span> {
<span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">range</span>.<span class="ident">start</span>();
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">range</span>.<span class="ident">end</span>();
<span class="kw">if</span> <span class="ident">start</span> <span class="op"><</span><span class="op">=</span> <span class="ident">end</span> <span class="op">&&</span> <span class="self">self</span>.<span class="ident">range</span> <span class="op">=</span><span class="op">=</span> (<span class="ident">start</span>..<span class="op">=</span><span class="ident">end</span>) {
<span class="comment">// If the range is still nonempty, this is obviously true</span>
<span class="comment">// If the range is exhausted, either start > end or</span>
<span class="comment">// the range does not equal start..=end.</span>
<span class="prelude-val">Some</span>((<span class="ident">start</span>, <span class="ident">end</span>))
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
}
<span class="doccomment">/// Implemented for ranges of all primitive integer types and `char`.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IntoParallelIterator</span> <span class="kw">for</span> <span class="ident">RangeInclusive</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>: <span class="ident">ParallelIterator</span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="op"><</span><span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">as</span> <span class="ident">ParallelIterator</span><span class="op">></span><span class="ident">::Item</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="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">range</span>: <span class="self">self</span> }
}
}
<span class="doccomment">/// These traits help drive integer type inference. Without them, an unknown `{integer}` type only</span>
<span class="doccomment">/// has constraints on `Iter<{integer}>`, which will probably give up and use `i32`. By adding</span>
<span class="doccomment">/// these traits on the item type, the compiler can see a more direct constraint to infer like</span>
<span class="doccomment">/// `{integer}: RangeInteger`, which works better. See `test_issue_833` for an example.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// They have to be `pub` since they're seen in the public `impl ParallelIterator` constraints, but</span>
<span class="doccomment">/// we put them in a private modules so they're not actually reachable in our public API.</span>
<span class="kw">mod</span> <span class="ident">private</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="doccomment">/// Implementation details of `ParallelIterator for Iter<Self>`</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">RangeInteger</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span> {
<span class="macro">private_decl!</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="ident">iter</span>: <span class="ident">Iter</span><span class="op"><</span><span class="self">Self</span><span class="op">></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="op">></span>;
<span class="kw">fn</span> <span class="ident">opt_len</span>(<span class="ident">iter</span>: <span class="kw-2">&</span><span class="ident">Iter</span><span class="op"><</span><span class="self">Self</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">usize</span><span class="op">></span>;
}
<span class="doccomment">/// Implementation details of `IndexedParallelIterator for Iter<Self>`</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">IndexedRangeInteger</span>: <span class="ident">RangeInteger</span> {
<span class="macro">private_decl!</span> {}
<span class="kw">fn</span> <span class="ident">drive</span><span class="op"><</span><span class="ident">C</span><span class="op">></span>(<span class="ident">iter</span>: <span class="ident">Iter</span><span class="op"><</span><span class="self">Self</span><span class="op">></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">Consumer</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">len</span>(<span class="ident">iter</span>: <span class="kw-2">&</span><span class="ident">Iter</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</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="ident">iter</span>: <span class="ident">Iter</span><span class="op"><</span><span class="self">Self</span><span class="op">></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="op">></span>;
}
}
<span class="kw">use</span> <span class="ident">private</span>::{<span class="ident">IndexedRangeInteger</span>, <span class="ident">RangeInteger</span>};
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">RangeInteger</span><span class="op">></span> <span class="ident">ParallelIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</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">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="ident">T</span><span class="op">></span>,
{
<span class="ident">T::drive_unindexed</span>(<span class="self">self</span>, <span class="ident">consumer</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</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="ident">T::opt_len</span>(<span class="self">self</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">IndexedRangeInteger</span><span class="op">></span> <span class="ident">IndexedParallelIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drive</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">Consumer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
{
<span class="ident">T::drive</span>(<span class="self">self</span>, <span class="ident">consumer</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</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="ident">T::len</span>(<span class="self">self</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="ident">T</span><span class="op">></span>,
{
<span class="ident">T::with_producer</span>(<span class="self">self</span>, <span class="ident">callback</span>)
}
}
<span class="macro">macro_rules!</span> <span class="ident">convert</span> {
( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">iter</span>:<span class="ident">ident</span> . <span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>:<span class="ident">ident</span> ( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">expr</span> ),<span class="op">*</span> ) ) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">start</span>, <span class="ident">end</span>)) <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">iter</span>.<span class="ident">bounds</span>() {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">end</span>) <span class="op">=</span> <span class="ident">end</span>.<span class="ident">checked_add</span>(<span class="number">1</span>) {
(<span class="ident">start</span>..<span class="ident">end</span>).<span class="ident">into_par_iter</span>().<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>($( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span> ),<span class="kw-2">*</span>)
} <span class="kw">else</span> {
(<span class="ident">start</span>..<span class="ident">end</span>).<span class="ident">into_par_iter</span>().<span class="ident">chain</span>(<span class="ident">once</span>(<span class="ident">end</span>)).<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>($( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span> ),<span class="kw-2">*</span>)
}
} <span class="kw">else</span> {
<span class="ident">empty</span>::<span class="op"><</span><span class="self">Self</span><span class="op">></span>().<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>($( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span> ),<span class="kw-2">*</span>)
}
};
}
<span class="macro">macro_rules!</span> <span class="ident">parallel_range_impl</span> {
( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span> ) <span class="op">=</span><span class="op">></span> {
<span class="kw">impl</span> <span class="ident">RangeInteger</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="macro">private_impl!</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="ident">iter</span>: <span class="ident">Iter</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>, <span class="ident">consumer</span>: <span class="ident">C</span>) <span class="op">-</span><span class="op">></span> <span class="ident">C::Result</span>
<span class="kw">where</span>
<span class="ident">C</span>: <span class="ident">UnindexedConsumer</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>,
{
<span class="macro">convert!</span>(<span class="ident">iter</span>.<span class="ident">drive_unindexed</span>(<span class="ident">consumer</span>))
}
<span class="kw">fn</span> <span class="ident">opt_len</span>(<span class="ident">iter</span>: <span class="kw-2">&</span><span class="ident">Iter</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="macro">convert!</span>(<span class="ident">iter</span>.<span class="ident">opt_len</span>())
}
}
};
}
<span class="macro">macro_rules!</span> <span class="ident">indexed_range_impl</span> {
( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span> ) <span class="op">=</span><span class="op">></span> {
<span class="macro">parallel_range_impl!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> }
<span class="kw">impl</span> <span class="ident">IndexedRangeInteger</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="macro">private_impl!</span> {}
<span class="kw">fn</span> <span class="ident">drive</span><span class="op"><</span><span class="ident">C</span><span class="op">></span>(<span class="ident">iter</span>: <span class="ident">Iter</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>, <span class="ident">consumer</span>: <span class="ident">C</span>) <span class="op">-</span><span class="op">></span> <span class="ident">C::Result</span>
<span class="kw">where</span>
<span class="ident">C</span>: <span class="ident">Consumer</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>,
{
<span class="macro">convert!</span>(<span class="ident">iter</span>.<span class="ident">drive</span>(<span class="ident">consumer</span>))
}
<span class="kw">fn</span> <span class="ident">len</span>(<span class="ident">iter</span>: <span class="kw-2">&</span><span class="ident">Iter</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="ident">iter</span>.<span class="ident">range</span>.<span class="ident">len</span>()
}
<span class="kw">fn</span> <span class="ident">with_producer</span><span class="op"><</span><span class="ident">CB</span><span class="op">></span>(<span class="ident">iter</span>: <span class="ident">Iter</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></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="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>,
{
<span class="macro">convert!</span>(<span class="ident">iter</span>.<span class="ident">with_producer</span>(<span class="ident">callback</span>))
}
}
};
}
<span class="comment">// all RangeInclusive<T> with ExactSizeIterator</span>
<span class="macro">indexed_range_impl!</span> {<span class="ident">u8</span>}
<span class="macro">indexed_range_impl!</span> {<span class="ident">u16</span>}
<span class="macro">indexed_range_impl!</span> {<span class="ident">i8</span>}
<span class="macro">indexed_range_impl!</span> {<span class="ident">i16</span>}
<span class="comment">// other RangeInclusive<T> with just Iterator</span>
<span class="macro">parallel_range_impl!</span> {<span class="ident">usize</span>}
<span class="macro">parallel_range_impl!</span> {<span class="ident">isize</span>}
<span class="macro">parallel_range_impl!</span> {<span class="ident">u32</span>}
<span class="macro">parallel_range_impl!</span> {<span class="ident">i32</span>}
<span class="macro">parallel_range_impl!</span> {<span class="ident">u64</span>}
<span class="macro">parallel_range_impl!</span> {<span class="ident">i64</span>}
<span class="macro">parallel_range_impl!</span> {<span class="ident">u128</span>}
<span class="macro">parallel_range_impl!</span> {<span class="ident">i128</span>}
<span class="comment">// char is special</span>
<span class="macro">macro_rules!</span> <span class="ident">convert_char</span> {
( <span class="macro-nonterminal">$</span><span class="self">self</span>:<span class="macro-nonterminal">ident</span> . <span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>:<span class="ident">ident</span> ( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">expr</span> ),<span class="op">*</span> ) ) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">start</span>, <span class="ident">end</span>)) <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="self">self</span>.<span class="macro-nonterminal">bounds</span>() {
<span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">start</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="ident">end</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="kw">if</span> <span class="ident">start</span> <span class="op"><</span> <span class="number">0xD800</span> <span class="op">&&</span> <span class="number">0xE000</span> <span class="op"><</span><span class="op">=</span> <span class="ident">end</span> {
<span class="comment">// chain the before and after surrogate range fragments</span>
(<span class="ident">start</span>..<span class="number">0xD800</span>)
.<span class="ident">into_par_iter</span>()
.<span class="ident">chain</span>(<span class="number">0xE000</span>..<span class="ident">end</span> <span class="op">+</span> <span class="number">1</span>) <span class="comment">// cannot use RangeInclusive, so add one to end</span>
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">codepoint</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">char::from_u32_unchecked</span>(<span class="ident">codepoint</span>) })
.<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>($( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span> ),<span class="kw-2">*</span>)
} <span class="kw">else</span> {
<span class="comment">// no surrogate range to worry about</span>
(<span class="ident">start</span>..<span class="ident">end</span> <span class="op">+</span> <span class="number">1</span>) <span class="comment">// cannot use RangeInclusive, so add one to end</span>
.<span class="ident">into_par_iter</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">codepoint</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">char::from_u32_unchecked</span>(<span class="ident">codepoint</span>) })
.<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>($( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span> ),<span class="kw-2">*</span>)
}
} <span class="kw">else</span> {
<span class="ident">empty</span>::<span class="op"><</span><span class="ident">char</span><span class="op">></span>().<span class="macro-nonterminal">$</span><span class="macro-nonterminal">method</span>($( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span> ),<span class="kw-2">*</span>)
}
};
}
<span class="kw">impl</span> <span class="ident">ParallelIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</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="macro">convert_char!</span>(<span class="self">self</span>.<span class="ident">drive</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="comment">// Range<u32> is broken on 16 bit platforms, may as well benefit from it</span>
<span class="kw">impl</span> <span class="ident">IndexedParallelIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> {
<span class="comment">// Split at the surrogate range first if we're allowed to</span>
<span class="kw">fn</span> <span class="ident">drive</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">Consumer</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>,
{
<span class="macro">convert_char!</span>(<span class="self">self</span>.<span class="ident">drive</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="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">start</span>, <span class="ident">end</span>)) <span class="op">=</span> <span class="self">self</span>.<span class="ident">bounds</span>() {
<span class="comment">// Taken from <char as Step>::steps_between</span>
<span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">start</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="ident">end</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">end</span> <span class="op">-</span> <span class="ident">start</span>;
<span class="kw">if</span> <span class="ident">start</span> <span class="op"><</span> <span class="number">0xD800</span> <span class="op">&&</span> <span class="number">0xE000</span> <span class="op"><</span><span class="op">=</span> <span class="ident">end</span> {
<span class="ident">count</span> <span class="op">-</span><span class="op">=</span> <span class="number">0x800</span>
}
(<span class="ident">count</span> <span class="op">+</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">usize</span> <span class="comment">// add one for inclusive</span>
} <span class="kw">else</span> {
<span class="number">0</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="macro">convert_char!</span>(<span class="self">self</span>.<span class="ident">with_producer</span>(<span class="ident">callback</span>))
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)]</span>
<span class="kw">fn</span> <span class="ident">test_u32_opt_len</span>() {
<span class="kw">use</span> <span class="ident">std::u32</span>;
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">101</span>), (<span class="number">0</span>..<span class="op">=</span><span class="number">100u32</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>());
<span class="macro">assert_eq!</span>(
<span class="prelude-val">Some</span>(<span class="ident">u32::MAX</span> <span class="kw">as</span> <span class="ident">usize</span>),
(<span class="number">0</span>..<span class="op">=</span><span class="ident">u32::MAX</span> <span class="op">-</span> <span class="number">1</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>()
);
<span class="macro">assert_eq!</span>(
<span class="prelude-val">Some</span>(<span class="ident">u32::MAX</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="number">1</span>),
(<span class="number">0</span>..<span class="op">=</span><span class="ident">u32::MAX</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>()
);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_u64_opt_len</span>() {
<span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">u64</span>, <span class="ident">usize</span>};
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">101</span>), (<span class="number">0</span>..<span class="op">=</span><span class="number">100u64</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>());
<span class="macro">assert_eq!</span>(
<span class="prelude-val">Some</span>(<span class="ident">usize::MAX</span>),
(<span class="number">0</span>..<span class="op">=</span><span class="ident">usize::MAX</span> <span class="kw">as</span> <span class="ident">u64</span> <span class="op">-</span> <span class="number">1</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>()
);
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..<span class="op">=</span><span class="ident">usize::MAX</span> <span class="kw">as</span> <span class="ident">u64</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..<span class="op">=</span><span class="ident">u64::MAX</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_u128_opt_len</span>() {
<span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">u128</span>, <span class="ident">usize</span>};
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">101</span>), (<span class="number">0</span>..<span class="op">=</span><span class="number">100u128</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>());
<span class="macro">assert_eq!</span>(
<span class="prelude-val">Some</span>(<span class="ident">usize::MAX</span>),
(<span class="number">0</span>..<span class="op">=</span><span class="ident">usize::MAX</span> <span class="kw">as</span> <span class="ident">u128</span> <span class="op">-</span> <span class="number">1</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>()
);
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..<span class="op">=</span><span class="ident">usize::MAX</span> <span class="kw">as</span> <span class="ident">u128</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..<span class="op">=</span><span class="ident">u128::MAX</span>).<span class="ident">into_par_iter</span>().<span class="ident">opt_len</span>());
}
<span class="comment">// `usize as i64` can overflow, so make sure to wrap it appropriately</span>
<span class="comment">// when using the `opt_len` "indexed" mode.</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)]</span>
<span class="kw">fn</span> <span class="ident">test_usize_i64_overflow</span>() {
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::ThreadPoolBuilder</span>;
<span class="kw">use</span> <span class="ident">std::i64</span>;
<span class="kw">let</span> <span class="ident">iter</span> <span class="op">=</span> (<span class="op">-</span><span class="number">2</span>..<span class="op">=</span><span class="ident">i64::MAX</span>).<span class="ident">into_par_iter</span>();
<span class="macro">assert_eq!</span>(<span class="ident">iter</span>.<span class="ident">opt_len</span>(), <span class="prelude-val">Some</span>(<span class="ident">i64::MAX</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="number">3</span>));
<span class="comment">// always run with multiple threads to split into, or this will take forever...</span>
<span class="kw">let</span> <span class="ident">pool</span> <span class="op">=</span> <span class="ident">ThreadPoolBuilder::new</span>().<span class="ident">num_threads</span>(<span class="number">8</span>).<span class="ident">build</span>().<span class="ident">unwrap</span>();
<span class="ident">pool</span>.<span class="ident">install</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">assert_eq!</span>(<span class="ident">iter</span>.<span class="ident">find_last</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="bool-val">true</span>), <span class="prelude-val">Some</span>(<span class="ident">i64::MAX</span>)));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_issue_833</span>() {
<span class="kw">fn</span> <span class="ident">is_even</span>(<span class="ident">n</span>: <span class="ident">i64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="ident">n</span> <span class="op">%</span> <span class="number">2</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span>
}
<span class="comment">// The integer type should be inferred from `is_even`</span>
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> (<span class="number">1</span>..<span class="op">=</span><span class="number">100</span>).<span class="ident">into_par_iter</span>().<span class="ident">filter</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">x</span><span class="op">|</span> <span class="ident">is_even</span>(<span class="ident">x</span>)).<span class="ident">collect</span>();
<span class="macro">assert!</span>(<span class="ident">v</span>.<span class="ident">into_iter</span>().<span class="ident">eq</span>((<span class="number">2</span>..<span class="op">=</span><span class="number">100</span>).<span class="ident">step_by</span>(<span class="number">2</span>)));
<span class="comment">// Try examples with indexed iterators too</span>
<span class="kw">let</span> <span class="ident">pos</span> <span class="op">=</span> (<span class="number">0</span>..<span class="op">=</span><span class="number">100</span>).<span class="ident">into_par_iter</span>().<span class="ident">position_any</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">=</span><span class="op">=</span> <span class="number">50i16</span>);
<span class="macro">assert_eq!</span>(<span class="ident">pos</span>, <span class="prelude-val">Some</span>(<span class="number">50usize</span>));
<span class="macro">assert!</span>((<span class="number">0</span>..<span class="op">=</span><span class="number">100</span>)
.<span class="ident">into_par_iter</span>()
.<span class="ident">zip</span>(<span class="number">0</span>..<span class="op">=</span><span class="number">100</span>)
.<span class="ident">all</span>(<span class="op">|</span>(<span class="ident">a</span>, <span class="ident">b</span>)<span class="op">|</span> <span class="ident">i16::eq</span>(<span class="kw-2">&</span><span class="ident">a</span>, <span class="kw-2">&</span><span class="ident">b</span>)));
}
</pre></div>
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