rhai/examples/no_std.rs

#![cfg_attr(feature = "no_std", no_std)]

use rhai::{Engine, EvalAltResult, INT};

#[cfg(feature = "no_std")]
extern crate alloc;

#[cfg(feature = "no_std")]
use alloc::boxed::Box;

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

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

    #[cfg(not(feature = "no_std"))]
    println!("Answer: {}", result);

    #[cfg(feature = "no_std")]
    assert_eq!(result, 42);

    Ok(())
}