With Rust we do not just use Getters and Setters.

why_getter_costs.rs

// Do not use Getter/Setter without immediate benefits, see also https://news.ycombinator.com/item?id=42506984
// There are costs for abstraction and indirection.
// And in Rust, there is the borrow checker!

#[derive(Default)]
struct Strategy {
    throughput: f64,
    position: Vec<f64>,
}

impl Strategy {
    fn throughput_mut(&mut self) -> &mut f64 {
        return &mut self.throughput
    }
}

#[derive(Default)]
struct Optimizer;

fn main() {
    let mut strategy = Strategy::default();
    let position = strategy.position;
    
    // Splitting borrows work on a field level
    strategy.throughput += 2.;

    // But does not work through GETTER!
    // See https://stackoverflow.com/questions/67154204/how-to-borrow-two-disjoint-fields-when-the-borrow-is-behind-a-method-call
    // let throughput = strategy.throughput_mut(); *throughput += 2.;

    println!("{} {:?}", strategy.throughput, position);
}