rhai/examples/simple_fn.rs

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//! An example showing how to register a simple Rust function.
use rhai::{Engine, EvalAltResult};
fn add(x: i64, y: i64) -> i64 {
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x + y
}
fn main() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
engine.register_fn("add", add);
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let result = engine.eval::<i64>("add(40, 2)")?;
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println!("Answer: {}", result); // prints 42
Ok(())
}