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<!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 `/home/sangenya/.cargo/registry/src/github.com-1ecc6299db9ec823/rayon-1.5.1/src/delegate.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>delegate.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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</pre><pre class="rust">
<span class="doccomment">//! Macros for delegating newtype iterators to inner types.</span>

<span class="comment">// Note: these place `impl` bounds at the end, as token gobbling is the only way</span>
<span class="comment">// I know how to consume an arbitrary list of constraints, with `$($args:tt)*`.</span>

<span class="doccomment">/// Creates a parallel iterator implementation which simply wraps an inner type</span>
<span class="doccomment">/// and delegates all methods inward.  The actual struct must already be</span>
<span class="doccomment">/// declared with an `inner` field.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The implementation of `IntoParallelIterator` should be added separately.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// delegate_iterator!{</span>
<span class="doccomment">///     MyIntoIter&lt;T, U&gt; =&gt; (T, U),</span>
<span class="doccomment">///     impl&lt;T: Ord + Send, U: Send&gt;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="macro">macro_rules!</span> <span class="ident">delegate_iterator</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">iter</span>:<span class="ident">ty</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span>:<span class="ident">ty</span> ,
     <span class="kw">impl</span> $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span> )<span class="op">*</span>
     ) <span class="op">=</span><span class="op">&gt;</span> {
        <span class="kw">impl</span> $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span> )<span class="op">*</span> <span class="ident">ParallelIterator</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">iter</span> {
            <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span>;

            <span class="kw">fn</span> <span class="ident">drive_unindexed</span><span class="op">&lt;</span><span class="ident">C</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">consumer</span>: <span class="ident">C</span>) <span class="op">-</span><span class="op">&gt;</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">&lt;</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">&gt;</span>
            {
                <span class="self">self</span>.<span class="ident">inner</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="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
                <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">opt_len</span>()
            }
        }
    }
}

<span class="doccomment">/// Creates an indexed parallel iterator implementation which simply wraps an</span>
<span class="doccomment">/// inner type and delegates all methods inward.  The actual struct must already</span>
<span class="doccomment">/// be declared with an `inner` field.</span>
<span class="macro">macro_rules!</span> <span class="ident">delegate_indexed_iterator</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">iter</span>:<span class="ident">ty</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span>:<span class="ident">ty</span> ,
     <span class="kw">impl</span> $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span> )<span class="op">*</span>
     ) <span class="op">=</span><span class="op">&gt;</span> {
        <span class="macro">delegate_iterator!</span>{
            <span class="macro-nonterminal">$</span><span class="macro-nonterminal">iter</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span> ,
            <span class="kw">impl</span> $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span> )<span class="op">*</span>
        }

        <span class="kw">impl</span> $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span> )<span class="op">*</span> <span class="ident">IndexedParallelIterator</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">iter</span> {
            <span class="kw">fn</span> <span class="ident">drive</span><span class="op">&lt;</span><span class="ident">C</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">consumer</span>: <span class="ident">C</span>) <span class="op">-</span><span class="op">&gt;</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">&lt;</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">&gt;</span>
            {
                <span class="self">self</span>.<span class="ident">inner</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">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
                <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>()
            }

            <span class="kw">fn</span> <span class="ident">with_producer</span><span class="op">&lt;</span><span class="ident">CB</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">callback</span>: <span class="ident">CB</span>) <span class="op">-</span><span class="op">&gt;</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">&lt;</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">&gt;</span>
            {
                <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">with_producer</span>(<span class="ident">callback</span>)
            }
        }
    }
}
</pre></div>
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