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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>IStdlib__PhysEqual (infer.IStdlib__PhysEqual)</title><link rel="stylesheet" href="../../odoc.css"/><meta charset="utf-8"/><meta name="generator" content="odoc 1.5.1"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body><div class="content"><header><nav><a href="../index.html">Up</a> – <a href="../index.html">infer</a> » IStdlib__PhysEqual</nav><h1>Module <code>IStdlib__PhysEqual</code></h1></header><dl><dt class="spec value" id="val-shallow_equal"><a href="#val-shallow_equal" class="anchor"></a><code><span class="keyword">val</span> shallow_equal : <span class="type-var">'a</span> <span>-></span> <span class="type-var">'a</span> <span>-></span> bool</code></dt></dl><aside><p>Helpers function to enforce physical equality.</p><p>Let suppose <code>construct/deconstruct</code> is a 1-level-allocation OCaml construction/deconstruction, such as variant type, tuple or record construction. Instead of writing</p><pre><code class="ml">let a = deconstruct a0 in
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let b = deconstruct b0 in
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let res = f a b in
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if phys_equal res a then a0 else if phys_equal res b then b0 else construct res</code></pre><p>Simply write</p><pre><code class="ml">PhysEqual.optim2 ~res:(construct (f a b)) a0 b0 </code></pre></aside><dl><dt class="spec value" id="val-optim1"><a href="#val-optim1" class="anchor"></a><code><span class="keyword">val</span> optim1 : <span>res:<span class="type-var">'a</span></span> <span>-></span> <span class="type-var">'a</span> <span>-></span> <span class="type-var">'a</span></code></dt><dt class="spec value" id="val-optim2"><a href="#val-optim2" class="anchor"></a><code><span class="keyword">val</span> optim2 : <span>res:<span class="type-var">'a</span></span> <span>-></span> <span class="type-var">'a</span> <span>-></span> <span class="type-var">'a</span> <span>-></span> <span class="type-var">'a</span></code></dt></dl></div></body></html>
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