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</pre><pre class="rust">
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="doccomment">/// Array zip macro: lock step function application across several arrays and</span>
<span class="doccomment">/// producers.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is a shorthand for [`Zip`](struct.Zip.html).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This example:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust,ignore</span>
<span class="doccomment">/// azip!(mut a, b, c in { *a = b + c })</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Is equivalent to:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust,ignore</span>
<span class="doccomment">/// Zip::from(&mut a).and(&b).and(&c).apply(|a, &b, &c| {</span>
<span class="doccomment">/// *a = b + c;</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Explanation of the shorthand for captures:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// + `mut a`: the producer is `&mut a` and the variable pattern is `mut a`.</span>
<span class="doccomment">/// + `b`: the producer is `&b` and the variable pattern is `&b` (same for `c`).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The syntax is `azip!(` *[* `index` *pattern* `,`*] capture [*`,` *capture [*`,` *...] ]* `in {` *expression* `})`</span>
<span class="doccomment">/// where the captures are a sequence of pattern-like items that indicate which</span>
<span class="doccomment">/// arrays are used for the zip. The *expression* is evaluated elementwise,</span>
<span class="doccomment">/// with the value of an element from each producer in their respective variable.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// More capture rules:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// + `ref c`: the producer is `&c` and the variable pattern is `c`.</span>
<span class="doccomment">/// + `mut a (expr)`: the producer is `expr` and the variable pattern is `mut a`.</span>
<span class="doccomment">/// + `b (expr)`: the producer is `expr` and the variable pattern is `&b`.</span>
<span class="doccomment">/// + `ref c (expr)`: the producer is `expr` and the variable pattern is `c`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Special rule:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// + `index i`: Use `Zip::indexed` instead. `i` is a pattern -- it can be</span>
<span class="doccomment">/// a single variable name or something else that pattern matches the index.</span>
<span class="doccomment">/// This rule must be the first if it is used, and it must be followed by</span>
<span class="doccomment">/// at least one other rule.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if any of the arrays are not of the same shape.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ## Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// #[macro_use(azip)]</span>
<span class="doccomment">/// extern crate ndarray;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use ndarray::Array2;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// type M = Array2<f32>;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() {</span>
<span class="doccomment">/// let mut a = M::zeros((16, 16));</span>
<span class="doccomment">/// let mut b = M::zeros(a.dim());</span>
<span class="doccomment">/// let mut c = M::zeros(a.dim());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // set up values in b, c</span>
<span class="doccomment">/// b.fill(1.);</span>
<span class="doccomment">/// for ((i, j), elt) in c.indexed_iter_mut() {</span>
<span class="doccomment">/// *elt = (i + 10 * j) as f32;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Compute a simple ternary operation:</span>
<span class="doccomment">/// // elementwise addition of b and c, stored in a</span>
<span class="doccomment">///</span>
<span class="doccomment">/// azip!(mut a, b, c in { *a = b + c });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(a, &b + &c);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Example of azip!() with index</span>
<span class="doccomment">///</span>
<span class="doccomment">/// azip!(index (i, j), b, c in {</span>
<span class="doccomment">/// a[[i, j]] = b - c;</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(a, &b - &c);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="macro">macro_rules!</span> <span class="ident">azip</span> {
<span class="comment">// Build Zip Rule (index)</span>
(@<span class="ident">parse</span> [<span class="ident">index</span> <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">aa</span>:<span class="ident">expr</span>,)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t1</span>:<span class="ident">tt</span> <span class="kw">in</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t2</span>:<span class="ident">tt</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">finish</span> (<span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::Zip::indexed</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>)) [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">aa</span>,)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t1</span> <span class="kw">in</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t2</span>)
};
<span class="comment">// Build Zip Rule (no index)</span>
(@<span class="ident">parse</span> [<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">aa</span>:<span class="ident">expr</span>,)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t1</span>:<span class="ident">tt</span> <span class="kw">in</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t2</span>:<span class="ident">tt</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">finish</span> (<span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::Zip::from</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>)) [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">aa</span>,)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t1</span> <span class="kw">in</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t2</span>)
};
<span class="comment">// Build Finish Rule (both)</span>
(@<span class="ident">finish</span> (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">z</span>:<span class="ident">expr</span>) [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">aa</span>:<span class="ident">expr</span>,)<span class="kw-2">*</span>] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">p</span>:<span class="ident">pat</span>,)<span class="op">+</span>] <span class="kw">in</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>}) <span class="op">=</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_mut</span>)]</span>
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">z</span>)
$(
.<span class="ident">and</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">aa</span>)
)<span class="op">*</span>
.<span class="ident">apply</span>(<span class="op">|</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">p</span>),<span class="op">+</span><span class="op">|</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="op">*</span>
})
};
<span class="comment">// parsing stack: [expressions] [patterns] (one per operand)</span>
<span class="comment">// index uses empty [] -- must be first</span>
(@<span class="ident">parse</span> [] [] <span class="ident">index</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">pat</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">parse</span> [<span class="ident">index</span> <span class="op">=</span><span class="op">></span>] [<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>,] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>);
};
(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">ident</span> (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>) $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>)<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>,] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>)<span class="op">*</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>,] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>);
};
(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">ident</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>)<span class="op">*</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>,] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>)<span class="op">*</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>,] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>);
};
(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] , $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>)<span class="kw-2">*</span>] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>)<span class="kw-2">*</span>] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>);
};
(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">ident</span> (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>) $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>)<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>,] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>)<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>,] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>);
};
(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">ident</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>)<span class="op">*</span> <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>,] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>)<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>,] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>);
};
(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">ident</span> (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>) $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>)<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>,] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>)<span class="op">*</span> <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>,] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>);
};
(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">ident</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>)<span class="op">*</span> <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>,] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>)<span class="op">*</span> <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>,] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>);
};
(@<span class="ident">parse</span> [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exprs</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] [$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pats</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { };
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">azip!</span>(@<span class="ident">parse</span> [] [] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>);
}
}
</pre></div>
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