use std::ops::Add;


fn f1<T>(a: T, b: T) -> impl Fn(T) -> T
where T: Add<Output=T> + Copy,
{
    move |c| c + a + b
}


fn f2<T>(f: impl Fn(T) -> T, val: T) -> T
where T: Add<Output=T> + Copy,
{

    f(val)
}



fn main() {

    let r = f1(2.0, 3.0)(4.3);

    let r = f2(|x| x + 1, 3);

    println!("res: {:?}", r);

}