use std::borrow::Borrow;

fn iter_everything<I, T>(iter: I)
    where I: IntoIterator<Item=T>,
          T: Borrow<f64>
{
    for i in iter.into_iter() {
        print!("{} ", *i.borrow() + 2.0);
    }

    println!();
}


fn main() {
    let vec = vec![1.0f64, 2.0, 3.0];

    iter_everything(vec.clone());
    iter_everything(&vec[1..]);
    iter_everything( std::iter::repeat(1.0f64).take(5))
}