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34 lines
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2.3 KiB
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<title>Hash.mix64 — Ludic</title>
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<meta name="description" content="Avalanche one 64-bit integer into a well-scrambled value.">
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<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-hash.html">Hash</a> <span>›</span> <span class="here">Hash.mix64</span></div>
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<div class="item-head">
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<span class="kind-badge kind-method">method</span>
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<h1 id="top">Hash.mix64</h1>
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<code class="sig">Hash.mix64(x) -> long</code>
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<div class="desc"><p>The 64-bit counterpart of <a href="hash-mix"><code>Hash.mix</code></a>: the <a href="https://en.wikipedia.org/wiki/MurmurHash">MurmurHash3</a> <code>fmix64</code> finalizer (shift by 33, multiply, repeat). It thoroughly scrambles a <code>long</code>, so consecutive or structured inputs map to unrelated-looking outputs — ideal for turning a large counter, packed coordinate, or 64-bit id into a random-looking seed. An <code>int</code> argument widens to 64 bits first. Deterministic; <code>Hash.mix64(0)</code> is <code>0</code>.</p></div>
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<div class="params"><h2>Parameters</h2><div class="param" id="param-x"><code class="pname">x</code><span class="pdesc">the integer to avalanche (widened to <code>long</code>)</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Seeds64 {
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entry {
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let base: long = Hash.of64("chunk")
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print(Hash.mix64(base))
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print(Hash.mix64(base + 1)) # a neighbouring input -> an unrelated seed
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}
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}</pre></div>
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