| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/git/checkouts/rayon-3b3b152053499ede/a07ce2e/src/range.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>range.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../rayon/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../rayon/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">//! Parallel iterator types for [ranges][std::range], |
| //! the type for values created by `a..b` expressions |
| //! |
| //! You will rarely need to interact with this module directly unless you have |
| //! need to name one of the iterator types. |
| //! |
| //! ``` |
| //! use rayon::prelude::*; |
| //! |
| //! let r = (0..100u64).into_par_iter() |
| //! .sum(); |
| //! |
| //! // compare result with sequential calculation |
| //! assert_eq!((0..100).sum::<u64>(), r); |
| //! ``` |
| //! |
| //! [std::range]: https://doc.rust-lang.org/core/ops/struct.Range.html |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::iter::plumbing::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::iter::<span class="kw-2">*</span>; |
| <span class="kw">use </span>std::char; |
| <span class="kw">use </span>std::convert::TryFrom; |
| <span class="kw">use </span>std::ops::Range; |
| <span class="kw">use </span>std::usize; |
| |
| <span class="doccomment">/// Parallel iterator over a range, implemented for all integer types and `char`. |
| /// |
| /// **Note:** The `zip` operation requires `IndexedParallelIterator` |
| /// which is not implemented for `u64`, `i64`, `u128`, or `i128`. |
| /// |
| /// ``` |
| /// use rayon::prelude::*; |
| /// |
| /// let p = (0..25usize).into_par_iter() |
| /// .zip(0..25usize) |
| /// .filter(|&(x, y)| x % 5 == 0 || y % 5 == 0) |
| /// .map(|(x, y)| x * y) |
| /// .sum::<usize>(); |
| /// |
| /// let s = (0..25usize).zip(0..25) |
| /// .filter(|&(x, y)| x % 5 == 0 || y % 5 == 0) |
| /// .map(|(x, y)| x * y) |
| /// .sum(); |
| /// |
| /// assert_eq!(p, s); |
| /// ``` |
| </span><span class="attribute">#[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>Iter<T> { |
| range: Range<T>, |
| } |
| |
| <span class="doccomment">/// Implemented for ranges of all primitive integer types and `char`. |
| </span><span class="kw">impl</span><T> IntoParallelIterator <span class="kw">for </span>Range<T> |
| <span class="kw">where |
| </span>Iter<T>: ParallelIterator, |
| { |
| <span class="kw">type </span>Item = <Iter<T> <span class="kw">as </span>ParallelIterator>::Item; |
| <span class="kw">type </span>Iter = Iter<T>; |
| |
| <span class="kw">fn </span>into_par_iter(<span class="self">self</span>) -> <span class="self">Self</span>::Iter { |
| Iter { range: <span class="self">self </span>} |
| } |
| } |
| |
| <span class="kw">struct </span>IterProducer<T> { |
| range: Range<T>, |
| } |
| |
| <span class="kw">impl</span><T> IntoIterator <span class="kw">for </span>IterProducer<T> |
| <span class="kw">where |
| </span>Range<T>: Iterator, |
| { |
| <span class="kw">type </span>Item = <Range<T> <span class="kw">as </span>Iterator>::Item; |
| <span class="kw">type </span>IntoIter = Range<T>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="self">self</span>.range |
| } |
| } |
| |
| <span class="doccomment">/// These traits help drive integer type inference. Without them, an unknown `{integer}` type only |
| /// has constraints on `Iter<{integer}>`, which will probably give up and use `i32`. By adding |
| /// these traits on the item type, the compiler can see a more direct constraint to infer like |
| /// `{integer}: RangeInteger`, which works better. See `test_issue_833` for an example. |
| /// |
| /// They have to be `pub` since they're seen in the public `impl ParallelIterator` constraints, but |
| /// we put them in a private modules so they're not actually reachable in our public API. |
| </span><span class="kw">mod </span>private { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// Implementation details of `ParallelIterator for Iter<Self>` |
| </span><span class="kw">pub trait </span>RangeInteger: Sized + Send { |
| <span class="macro">private_decl! </span>{} |
| |
| <span class="kw">fn </span>drive_unindexed<C>(iter: Iter<<span class="self">Self</span>>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="self">Self</span>>; |
| |
| <span class="kw">fn </span>opt_len(iter: <span class="kw-2">&</span>Iter<<span class="self">Self</span>>) -> <span class="prelude-ty">Option</span><usize>; |
| } |
| |
| <span class="doccomment">/// Implementation details of `IndexedParallelIterator for Iter<Self>` |
| </span><span class="kw">pub trait </span>IndexedRangeInteger: RangeInteger { |
| <span class="macro">private_decl! </span>{} |
| |
| <span class="kw">fn </span>drive<C>(iter: Iter<<span class="self">Self</span>>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<<span class="self">Self</span>>; |
| |
| <span class="kw">fn </span>len(iter: <span class="kw-2">&</span>Iter<<span class="self">Self</span>>) -> usize; |
| |
| <span class="kw">fn </span>with_producer<CB>(iter: Iter<<span class="self">Self</span>>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<<span class="self">Self</span>>; |
| } |
| } |
| <span class="kw">use </span>private::{IndexedRangeInteger, RangeInteger}; |
| |
| <span class="kw">impl</span><T: RangeInteger> ParallelIterator <span class="kw">for </span>Iter<T> { |
| <span class="kw">type </span>Item = T; |
| |
| <span class="kw">fn </span>drive_unindexed<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<T>, |
| { |
| T::drive_unindexed(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>opt_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| T::opt_len(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T: IndexedRangeInteger> IndexedParallelIterator <span class="kw">for </span>Iter<T> { |
| <span class="kw">fn </span>drive<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<T>, |
| { |
| T::drive(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| T::len(<span class="self">self</span>) |
| } |
| |
| <span class="kw">fn </span>with_producer<CB>(<span class="self">self</span>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<T>, |
| { |
| T::with_producer(<span class="self">self</span>, callback) |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>indexed_range_impl { |
| ( <span class="macro-nonterminal">$t</span>:ty ) => { |
| <span class="kw">impl </span>RangeInteger <span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="macro">private_impl! </span>{} |
| |
| <span class="kw">fn </span>drive_unindexed<C>(iter: Iter<<span class="macro-nonterminal">$t</span>>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="macro-nonterminal">$t</span>>, |
| { |
| bridge(iter, consumer) |
| } |
| |
| <span class="kw">fn </span>opt_len(iter: <span class="kw-2">&</span>Iter<<span class="macro-nonterminal">$t</span>>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="prelude-val">Some</span>(iter.range.len()) |
| } |
| } |
| |
| <span class="kw">impl </span>IndexedRangeInteger <span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="macro">private_impl! </span>{} |
| |
| <span class="kw">fn </span>drive<C>(iter: Iter<<span class="macro-nonterminal">$t</span>>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<<span class="macro-nonterminal">$t</span>>, |
| { |
| bridge(iter, consumer) |
| } |
| |
| <span class="kw">fn </span>len(iter: <span class="kw-2">&</span>Iter<<span class="macro-nonterminal">$t</span>>) -> usize { |
| iter.range.len() |
| } |
| |
| <span class="kw">fn </span>with_producer<CB>(iter: Iter<<span class="macro-nonterminal">$t</span>>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<<span class="macro-nonterminal">$t</span>>, |
| { |
| callback.callback(IterProducer { range: iter.range }) |
| } |
| } |
| |
| <span class="kw">impl </span>Producer <span class="kw">for </span>IterProducer<<span class="macro-nonterminal">$t</span>> { |
| <span class="kw">type </span>Item = <Range<<span class="macro-nonterminal">$t</span>> <span class="kw">as </span>Iterator>::Item; |
| <span class="kw">type </span>IntoIter = Range<<span class="macro-nonterminal">$t</span>>; |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="self">self</span>.range |
| } |
| |
| <span class="kw">fn </span>split_at(<span class="self">self</span>, index: usize) -> (<span class="self">Self</span>, <span class="self">Self</span>) { |
| <span class="macro">assert!</span>(index <= <span class="self">self</span>.range.len()); |
| <span class="comment">// For signed $t, the length and requested index could be greater than $t::MAX, and |
| // then `index as $t` could wrap to negative, so wrapping_add is necessary. |
| </span><span class="kw">let </span>mid = <span class="self">self</span>.range.start.wrapping_add(index <span class="kw">as </span><span class="macro-nonterminal">$t</span>); |
| <span class="kw">let </span>left = <span class="self">self</span>.range.start..mid; |
| <span class="kw">let </span>right = mid..<span class="self">self</span>.range.end; |
| (IterProducer { range: left }, IterProducer { range: right }) |
| } |
| } |
| }; |
| } |
| |
| <span class="kw">trait </span>UnindexedRangeLen<L> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> L; |
| } |
| |
| <span class="macro">macro_rules! </span>unindexed_range_impl { |
| ( <span class="macro-nonterminal">$t</span>:ty, <span class="macro-nonterminal">$len_t</span>:ty ) => { |
| <span class="kw">impl </span>UnindexedRangeLen<<span class="macro-nonterminal">$len_t</span>> <span class="kw">for </span>Range<<span class="macro-nonterminal">$t</span>> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="macro-nonterminal">$len_t </span>{ |
| <span class="kw">let </span><span class="kw-2">&</span>Range { start, end } = <span class="self">self</span>; |
| <span class="kw">if </span>end > start { |
| end.wrapping_sub(start) <span class="kw">as </span><span class="macro-nonterminal">$len_t |
| </span>} <span class="kw">else </span>{ |
| <span class="number">0 |
| </span>} |
| } |
| } |
| |
| <span class="kw">impl </span>RangeInteger <span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="macro">private_impl! </span>{} |
| |
| <span class="kw">fn </span>drive_unindexed<C>(iter: Iter<<span class="macro-nonterminal">$t</span>>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="macro-nonterminal">$t</span>>, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>offset(start: <span class="macro-nonterminal">$t</span>) -> <span class="kw">impl </span>Fn(usize) -> <span class="macro-nonterminal">$t </span>{ |
| <span class="kw">move </span>|i| start.wrapping_add(i <span class="kw">as </span><span class="macro-nonterminal">$t</span>) |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(len) = iter.opt_len() { |
| <span class="comment">// Drive this in indexed mode for better `collect`. |
| </span>(<span class="number">0</span>..len) |
| .into_par_iter() |
| .map(offset(iter.range.start)) |
| .drive(consumer) |
| } <span class="kw">else </span>{ |
| bridge_unindexed(IterProducer { range: iter.range }, consumer) |
| } |
| } |
| |
| <span class="kw">fn </span>opt_len(iter: <span class="kw-2">&</span>Iter<<span class="macro-nonterminal">$t</span>>) -> <span class="prelude-ty">Option</span><usize> { |
| usize::try_from(iter.range.len()).ok() |
| } |
| } |
| |
| <span class="kw">impl </span>UnindexedProducer <span class="kw">for </span>IterProducer<<span class="macro-nonterminal">$t</span>> { |
| <span class="kw">type </span>Item = <span class="macro-nonterminal">$t</span>; |
| |
| <span class="kw">fn </span>split(<span class="kw-2">mut </span><span class="self">self</span>) -> (<span class="self">Self</span>, <span class="prelude-ty">Option</span><<span class="self">Self</span>>) { |
| <span class="kw">let </span>index = <span class="self">self</span>.range.len() / <span class="number">2</span>; |
| <span class="kw">if </span>index > <span class="number">0 </span>{ |
| <span class="kw">let </span>mid = <span class="self">self</span>.range.start.wrapping_add(index <span class="kw">as </span><span class="macro-nonterminal">$t</span>); |
| <span class="kw">let </span>right = mid..<span class="self">self</span>.range.end; |
| <span class="self">self</span>.range.end = mid; |
| (<span class="self">self</span>, <span class="prelude-val">Some</span>(IterProducer { range: right })) |
| } <span class="kw">else </span>{ |
| (<span class="self">self</span>, <span class="prelude-val">None</span>) |
| } |
| } |
| |
| <span class="kw">fn </span>fold_with<F>(<span class="self">self</span>, folder: F) -> F |
| <span class="kw">where |
| </span>F: Folder<<span class="self">Self</span>::Item>, |
| { |
| folder.consume_iter(<span class="self">self</span>) |
| } |
| } |
| }; |
| } |
| |
| <span class="comment">// all Range<T> with ExactSizeIterator |
| </span><span class="macro">indexed_range_impl! </span>{u8} |
| <span class="macro">indexed_range_impl! </span>{u16} |
| <span class="macro">indexed_range_impl! </span>{u32} |
| <span class="macro">indexed_range_impl! </span>{usize} |
| <span class="macro">indexed_range_impl! </span>{i8} |
| <span class="macro">indexed_range_impl! </span>{i16} |
| <span class="macro">indexed_range_impl! </span>{i32} |
| <span class="macro">indexed_range_impl! </span>{isize} |
| |
| <span class="comment">// other Range<T> with just Iterator |
| </span><span class="macro">unindexed_range_impl! </span>{u64, u64} |
| <span class="macro">unindexed_range_impl! </span>{i64, u64} |
| <span class="macro">unindexed_range_impl! </span>{u128, u128} |
| <span class="macro">unindexed_range_impl! </span>{i128, u128} |
| |
| <span class="comment">// char is special because of the surrogate range hole |
| </span><span class="macro">macro_rules! </span>convert_char { |
| ( <span class="macro-nonterminal">$self</span>:ident . <span class="macro-nonterminal">$method</span>:ident ( $( <span class="macro-nonterminal">$arg</span>:expr ),* ) ) => {{ |
| <span class="kw">let </span>start = <span class="macro-nonterminal">$self</span>.range.start <span class="kw">as </span>u32; |
| <span class="kw">let </span>end = <span class="macro-nonterminal">$self</span>.range.end <span class="kw">as </span>u32; |
| <span class="kw">if </span>start < <span class="number">0xD800 </span>&& <span class="number">0xE000 </span>< end { |
| <span class="comment">// chain the before and after surrogate range fragments |
| </span>(start..<span class="number">0xD800</span>) |
| .into_par_iter() |
| .chain(<span class="number">0xE000</span>..end) |
| .map(|codepoint| <span class="kw">unsafe </span>{ char::from_u32_unchecked(codepoint) }) |
| .<span class="macro-nonterminal">$method</span>($( <span class="macro-nonterminal">$arg </span>),<span class="kw-2">*</span>) |
| } <span class="kw">else </span>{ |
| <span class="comment">// no surrogate range to worry about |
| </span>(start..end) |
| .into_par_iter() |
| .map(|codepoint| <span class="kw">unsafe </span>{ char::from_u32_unchecked(codepoint) }) |
| .<span class="macro-nonterminal">$method</span>($( <span class="macro-nonterminal">$arg </span>),<span class="kw-2">*</span>) |
| } |
| }}; |
| } |
| |
| <span class="kw">impl </span>ParallelIterator <span class="kw">for </span>Iter<char> { |
| <span class="kw">type </span>Item = char; |
| |
| <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="macro">convert_char!</span>(<span class="self">self</span>.drive(consumer)) |
| } |
| |
| <span class="kw">fn </span>opt_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.len()) |
| } |
| } |
| |
| <span class="kw">impl </span>IndexedParallelIterator <span class="kw">for </span>Iter<char> { |
| <span class="comment">// Split at the surrogate range first if we're allowed to |
| </span><span class="kw">fn </span>drive<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<<span class="self">Self</span>::Item>, |
| { |
| <span class="macro">convert_char!</span>(<span class="self">self</span>.drive(consumer)) |
| } |
| |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="comment">// Taken from <char as Step>::steps_between |
| </span><span class="kw">let </span>start = <span class="self">self</span>.range.start <span class="kw">as </span>u32; |
| <span class="kw">let </span>end = <span class="self">self</span>.range.end <span class="kw">as </span>u32; |
| <span class="kw">if </span>start < end { |
| <span class="kw">let </span><span class="kw-2">mut </span>count = end - start; |
| <span class="kw">if </span>start < <span class="number">0xD800 </span>&& <span class="number">0xE000 </span><= end { |
| count -= <span class="number">0x800 |
| </span>} |
| count <span class="kw">as </span>usize |
| } <span class="kw">else </span>{ |
| <span class="number">0 |
| </span>} |
| } |
| |
| <span class="kw">fn </span>with_producer<CB>(<span class="self">self</span>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<<span class="self">Self</span>::Item>, |
| { |
| <span class="macro">convert_char!</span>(<span class="self">self</span>.with_producer(callback)) |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>check_range_split_at_overflow() { |
| <span class="comment">// Note, this split index overflows i8! |
| </span><span class="kw">let </span>producer = IterProducer { range: -<span class="number">100i8</span>..<span class="number">100 </span>}; |
| <span class="kw">let </span>(left, right) = producer.split_at(<span class="number">150</span>); |
| <span class="kw">let </span>r1: i32 = left.range.map(i32::from).sum(); |
| <span class="kw">let </span>r2: i32 = right.range.map(i32::from).sum(); |
| <span class="macro">assert_eq!</span>(r1 + r2, -<span class="number">100</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_i128_len_doesnt_overflow() { |
| <span class="kw">use </span>std::{i128, u128}; |
| |
| <span class="comment">// Using parse because some versions of rust don't allow long literals |
| </span><span class="kw">let </span>octillion: i128 = <span class="string">"1000000000000000000000000000"</span>.parse().unwrap(); |
| <span class="kw">let </span>producer = IterProducer { |
| range: <span class="number">0</span>..octillion, |
| }; |
| |
| <span class="macro">assert_eq!</span>(octillion <span class="kw">as </span>u128, producer.range.len()); |
| <span class="macro">assert_eq!</span>(octillion <span class="kw">as </span>u128, (<span class="number">0</span>..octillion).len()); |
| <span class="macro">assert_eq!</span>(<span class="number">2 </span>* octillion <span class="kw">as </span>u128, (-octillion..octillion).len()); |
| |
| <span class="macro">assert_eq!</span>(u128::MAX, (i128::MIN..i128::MAX).len()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_u64_opt_len() { |
| <span class="kw">use </span>std::{u64, usize}; |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">100</span>), (<span class="number">0</span>..<span class="number">100u64</span>).into_par_iter().opt_len()); |
| <span class="macro">assert_eq!</span>( |
| <span class="prelude-val">Some</span>(usize::MAX), |
| (<span class="number">0</span>..usize::MAX <span class="kw">as </span>u64).into_par_iter().opt_len() |
| ); |
| <span class="kw">if </span>(usize::MAX <span class="kw">as </span>u64) < u64::MAX { |
| <span class="macro">assert_eq!</span>( |
| <span class="prelude-val">None</span>, |
| (<span class="number">0</span>..(usize::MAX <span class="kw">as </span>u64).wrapping_add(<span class="number">1</span>)) |
| .into_par_iter() |
| .opt_len() |
| ); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..u64::MAX).into_par_iter().opt_len()); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_u128_opt_len() { |
| <span class="kw">use </span>std::{u128, usize}; |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">100</span>), (<span class="number">0</span>..<span class="number">100u128</span>).into_par_iter().opt_len()); |
| <span class="macro">assert_eq!</span>( |
| <span class="prelude-val">Some</span>(usize::MAX), |
| (<span class="number">0</span>..usize::MAX <span class="kw">as </span>u128).into_par_iter().opt_len() |
| ); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..<span class="number">1 </span>+ usize::MAX <span class="kw">as </span>u128).into_par_iter().opt_len()); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..u128::MAX).into_par_iter().opt_len()); |
| } |
| |
| <span class="comment">// `usize as i64` can overflow, so make sure to wrap it appropriately |
| // when using the `opt_len` "indexed" mode. |
| </span><span class="attribute">#[test] |
| #[cfg(target_pointer_width = <span class="string">"64"</span>)] |
| </span><span class="kw">fn </span>test_usize_i64_overflow() { |
| <span class="kw">use </span><span class="kw">crate</span>::ThreadPoolBuilder; |
| <span class="kw">use </span>std::i64; |
| |
| <span class="kw">let </span>iter = (-<span class="number">2</span>..i64::MAX).into_par_iter(); |
| <span class="macro">assert_eq!</span>(iter.opt_len(), <span class="prelude-val">Some</span>(i64::MAX <span class="kw">as </span>usize + <span class="number">2</span>)); |
| |
| <span class="comment">// always run with multiple threads to split into, or this will take forever... |
| </span><span class="kw">let </span>pool = ThreadPoolBuilder::new().num_threads(<span class="number">8</span>).build().unwrap(); |
| pool.install(|| <span class="macro">assert_eq!</span>(iter.find_last(|<span class="kw">_</span>| <span class="bool-val">true</span>), <span class="prelude-val">Some</span>(i64::MAX - <span class="number">1</span>))); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_issue_833() { |
| <span class="kw">fn </span>is_even(n: i64) -> bool { |
| n % <span class="number">2 </span>== <span class="number">0 |
| </span>} |
| |
| <span class="comment">// The integer type should be inferred from `is_even` |
| </span><span class="kw">let </span>v: Vec<<span class="kw">_</span>> = (<span class="number">1</span>..<span class="number">100</span>).into_par_iter().filter(|<span class="kw-2">&</span>x| is_even(x)).collect(); |
| <span class="macro">assert!</span>(v.into_iter().eq((<span class="number">2</span>..<span class="number">100</span>).step_by(<span class="number">2</span>))); |
| |
| <span class="comment">// Try examples with indexed iterators too |
| </span><span class="kw">let </span>pos = (<span class="number">0</span>..<span class="number">100</span>).into_par_iter().position_any(|x| x == <span class="number">50i16</span>); |
| <span class="macro">assert_eq!</span>(pos, <span class="prelude-val">Some</span>(<span class="number">50usize</span>)); |
| |
| <span class="macro">assert!</span>((<span class="number">0</span>..<span class="number">100</span>) |
| .into_par_iter() |
| .zip(<span class="number">0</span>..<span class="number">100</span>) |
| .all(|(a, b)| i16::eq(<span class="kw-2">&</span>a, <span class="kw-2">&</span>b))); |
| } |
| </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> |
