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//@ run-pass
use std::mem::swap;
#[derive(Debug)]
struct Ints {sum: Box<isize>, values: Vec<isize> }
fn add_int(x: &mut Ints, v: isize) {
*x.sum += v;
let mut values = Vec::new();
swap(&mut values, &mut x.values);
values.push(v);
swap(&mut values, &mut x.values);
}
fn iter_ints<F>(x: &Ints, mut f: F) -> bool where F: FnMut(&isize) -> bool {
let l = x.values.len();
(0..l).all(|i| f(&x.values[i]))
}
pub fn main() {
let mut ints: Box<_> = Box::new(Ints {sum: Box::new(0), values: Vec::new()});
add_int(&mut *ints, 22);
add_int(&mut *ints, 44);
iter_ints(&*ints, |i| {
println!("isize = {:?}", *i);
true
});
println!("ints={:?}", ints);
}
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