lua.rs

fn example() -> Result<()> {
    let mut state = flu::State::new();

    // lua_createtable and luaL_ref
    let meta = flu::Table::reference(&state, |cxt| {
        fn __add(stack: flu::FunctionStack) -> Result<i32> {
            let a = stack.with_arg::<flu::Table, _, _>(1, |cxt| {
                cxt.get::<f64>("a")
            })?;

            let b = stack.with_arg::<flu::Table, _, _>(2, |cxt| {
                cxt.get::<f64>("a")
            })?;

            stack.push(a + b);

            Ok(1)
        }

        cxt.set("__add", __add);
    });

    let b = 4;
    state.set("test", flu::Table::new(|cxt| {
        cxt.set("a", b);
        cxt.set_meta(&meta);
    }));

    state.eval(r#"
test = test + test
      
print(test) -- prints 8
    "#)?;

    Ok(())
}