:title
INIT

:sig
INIT(Request& context)

:see
>1_COMPONENT
>1_ONCE
>1_RENDER
>1_WS
>3_C++ Preprocessor
>unit_call

:content
Defines a worker-load hook for the current `.uce` unit.

When a worker instantiates the unit's compiled wasm module, the runtime checks whether the unit exposes `INIT(Request& context)`. If it does, the hook runs once for that instance before the unit begins serving requests from that worker-local copy.

Because UCE usually loads units on demand during a request, `INIT()` still receives a valid `Request& context`. Use it for worker-local initialization, not for request-local state that should reset each request.

## Typical Uses

- warm caches or parse static lookup data into globals
- initialize worker-local helper state for expensive component trees
- perform one-time registration work for that unit's in-memory copy

## Example

```cpp
std::map<String, String> cached_labels;

INIT(Request& context)
{
	if(cached_labels.empty())
		cached_labels["ready"] = "Ready";
}

COMPONENT(Request& context)
{
	<>
		<p><?= cached_labels["ready"] ?></p>
	</>
}
```

## Related Concepts

- PHP: opcode-cache preload or one-time bootstrap work per worker process
- JavaScript / Node.js: module-load initialization or lazy singleton setup