src/test/ui/borrowck/borrowck-mut-uniq.rs

   1 // run-pass
   2
   3 use std::mem::swap;
   4
   5 #[derive(Debug)]
   6 struct Ints {sum: Box<isize>, values: Vec<isize> }
   7
   8 fn add_int(x: &mut Ints, v: isize) {
   9     *x.sum += v;
  10     let mut values = Vec::new();
  11     swap(&mut values, &mut x.values);
  12     values.push(v);
  13     swap(&mut values, &mut x.values);
  14 }
  15
  16 fn iter_ints<F>(x: &Ints, mut f: F) -> bool where F: FnMut(&isize) -> bool {
  17     let l = x.values.len();
  18     (0..l).all(|i| f(&x.values[i]))
  19 }
  20
  21 pub fn main() {
  22     let mut ints: Box<_> = Box::new(Ints {sum: Box::new(0), values: Vec::new()});
  23     add_int(&mut *ints, 22);
  24     add_int(&mut *ints, 44);
  25
  26     iter_ints(&*ints, |i| {
  27         println!("isize = {:?}", *i);
  28         true
  29     });
  30
  31     println!("ints={:?}", ints);
  32 }