pub type Operator = dyn Fn(f64, f64) -> f64;

pub struct Operation {
    sign: char,
    func: Box<Operator>
}

impl Operation {
    pub fn new(sign: char, func: Box<Operator>) -> Self {
        Self { sign, func }
    }

    pub fn sign(&self) -> char {
        self.sign
    }

    pub fn evaluate(&self, a: f64, b: f64) -> f64 {
        (self.func)(a, b)
    }
}

#[macro_export]
macro_rules! opvec {
    ($(($x:expr, $y:expr)), *) => {
        vec![$(
            Operation::new($x, Box::new($y)),
        )*]
    };
}