rhai/examples/simple_fn.rs

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use rhai::{Engine, EvalAltResult, RegisterFn, INT};
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fn add(x: INT, y: INT) -> INT {
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::<INT>("add(40, 2)")?;
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println!("Answer: {}", result); // prints 42
Ok(())
}