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rhaj/rhai_engine/rhaibook/safety/max-functions.md
2025-04-03 09:18:05 +02:00

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Maximum Number of Functions
===========================
{{#include ../links.md}}
Rhai by default does not limit how many [functions] can be defined in a script.
This can be changed via the [`Engine::set_max_functions`][options] method. Notice that setting the
maximum number of [functions] to zero does _not_ indicate unlimited [functions], but disallows
defining any scripted [function] altogether.
A script attempting to load more than the maximum number of [functions] will terminate with a parse error.
This check can be disabled via the [`unchecked`] feature for higher performance (but higher risks as well).
```rust
let mut engine = Engine::new();
engine.set_max_functions(5); // allow defining only up to 5 functions
engine.set_max_functions(0); // disallow defining function (maximum = zero)
engine.set_max_functions(1000); // set to a large number for effectively unlimited functions
```