src/test/run-pass/swap-2.rs

   1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // pretty-expanded FIXME #23616
  12
  13 use std::mem::swap;
  14
  15 pub fn main() {
  16     let mut a: Vec<isize> = vec!(0, 1, 2, 3, 4, 5, 6);
  17     a.swap(2, 4);
  18     assert_eq!(a[2], 4);
  19     assert_eq!(a[4], 2);
  20     let mut n = 42;
  21     swap(&mut n, &mut a[0]);
  22     assert_eq!(a[0], 42);
  23     assert_eq!(n, 0);
  24 }