use eqsolver::single_variable::Secant;
use std::cell::RefCell;

fn main() {
    // Sometimes the function to be solved requires mutation of its environment,
    // for example saving the values that function was called with, or for
    // memoization.  This mutation behaviour can be done using a
    // `std::cell::RefCell` as in this example.

    let trace = RefCell::new(vec![]);
    let f = |x: f64| {
        trace.borrow_mut().push(x);
        x * x - 2.
    };

    Secant::new(f).solve(0., 2.).unwrap();

    println!("{:?}", trace.borrow());

    // See this issue, https://github.com/AzeezDa/eqsolver/issues/5, for the
    // reasoning behind this technicality.
}