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<title>@OnDetach — Ludic</title>
<meta name="description" content="Run a handler when a property is structurally detached from a live instance.">
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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">@OnDetach</span></div>
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<h1 id="top">@OnDetach</h1>
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<code class="sig">@OnDetach(Property) handler Name { … }</code>
<div class="desc"><p><code>@OnDetach(Property)</code> is the teardown counterpart to <code>@OnAttach</code>: it fires when the named property is structurally removed from a live instance with <code>detach P on e</code>. The hook runs <b>before</b> the property's presence flag clears, so its body can still read the outgoing field values one last time — useful for releasing whatever the property was tracking or logging its final state. It is distinct from <code>@OnDisable</code>, which pauses a property while keeping its data; detach actually destroys the property's presence on the instance. Add <code>@Public</code> to also emit a <code>prop_&lt;Property&gt;_detach</code> event.</p></div>
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program DetachHook {
property Tag { value: int = 0 }
property Shield { amount: int = 0 }
model Unit { Tag }
@OnDetach(Shield) handler DropShield { # fires as Shield is removed
print(Shield.amount + 20) # 25 — reads the outgoing amount
}
handler Seed phase Start {
spawn Unit { Tag { value: 1 } }
for (unit) in query [Unit] { attach Shield on self() { amount: 5 } }
}
handler RemoveShield phase Render {
for (shield) in query [Shield] {
detach Shield on self() # triggers @OnDetach
}
quit()
}
}</pre></div>
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