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rhai 0.19.11

Embedded scripting for Rust
Documentation 
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use rhai::{Engine, EvalAltResult, RegisterFn, INT};

fn add(x: INT, y: INT) -> INT {
    x + y
}

fn main() -> Result<(), Box<EvalAltResult>> {
    let mut engine = Engine::new();

    engine.register_fn("add", add);

    let result = engine.eval::<INT>("add(40, 2)")?;

    println!("Answer: {}", result); // prints 42

    Ok(())
}