rhaj/_archive/rhai_engine/rhaibook/safety/max-functions.md

Maximum Number of Functions

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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).

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