rust-function-pointer.rs

struct S;

impl S {
    fn foo(&self) { println!("S::foo"); }
    fn bar(&self) { println!("S::bar"); }
}

fn foo() { println!("foo"); }
fn bar() { println!("bar"); }

fn main() {
    let fps: [fn();2] = [foo, bar];
    for f in fps.iter() {
        f();
    }
    println!("sizeof={}", std::mem::size_of_val(&fps));

    let s = S {};
    let fps: [&Fn(&S);2] = [&S::foo, &S::bar];
    for f in fps.iter() {
        f(&s);
    }
    println!("sizeof={}", std::mem::size_of_val(&fps));
}