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<title>@System — Ludic</title>
<meta name="description" content="Register a prebuilt binary module&#x27;s system with the host at load, per phase.">
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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="api.html#annotations">Annotations</a> <span>›</span> <span class="here">@System</span></div>
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<h1 id="top">@System</h1>
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<code class="sig">"@System(Phase) function name() { … }"</code>
<div class="desc"><p><code>@System(Phase)</code> marks a function in a prebuilt binary module (one compiled with <code>--emit-module</code>) as a runtime-registered system. The module carries a load-time constructor that hands each such function to the host through <code>ludic_register_system</code>, and the host's frame loop calls it every <code>Phase</code> after its own handlers — the runtime, escape-hatch counterpart of the compile-time <code>@EngineSystem</code>. The compiler supplies the function's address (Ludic source cannot take one). This is how a closed-source or other-language module contributes systems over the reflection C-ABI; source packages that compile into the consumer should prefer <code>@EngineSystem</code>. Phases are <code>Input</code>, <code>FixedUpdate</code>, <code>Update</code>, <code>LateUpdate</code> and <code>Render</code>.</p></div>
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program ManaModule {
function module_init() -&gt; void { world_register_prop("Mana", 2) } # register a component at load
@System(Update) function mana_regen() -&gt; void { # runs every Update in the host
let M = world_prop_id("Mana")
let e = world_query_next(M, 0)
if e &gt;= 0 { world_set(e, M, 0, world_get(e, M, 0) + 1) }
}
}</pre></div>
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