tests/ui/overloaded/overloaded-deref.rs

   1 // run-pass
   2 use std::cell::RefCell;
   3 use std::rc::Rc;
   4 use std::string::String;
   5
   6 #[derive(PartialEq, Debug)]
   7 struct Point {
   8     x: isize,
   9     y: isize
  10 }
  11
  12 pub fn main() {
  13     assert_eq!(*Rc::new(5), 5);
  14     assert_eq!(***Rc::new(Box::new(Box::new(5))), 5);
  15     assert_eq!(*Rc::new(Point {x: 2, y: 4}), Point {x: 2, y: 4});
  16
  17     let i = Rc::new(RefCell::new(2));
  18     let i_value = *(*i).borrow();
  19     *(*i).borrow_mut() = 5;
  20     assert_eq!((i_value, *(*i).borrow()), (2, 5));
  21
  22     let s = Rc::new("foo".to_string());
  23     assert_eq!(*s, "foo".to_string());
  24     assert_eq!((*s), "foo");
  25
  26     let mut_s = Rc::new(RefCell::new(String::from("foo")));
  27     (*(*mut_s).borrow_mut()).push_str("bar");
  28     // assert_eq! would panic here because it stores the LHS and RHS in two locals.
  29     assert_eq!((*(*mut_s).borrow()), "foobar");
  30     assert_eq!((*(*mut_s).borrow_mut()), "foobar");
  31
  32     let p = Rc::new(RefCell::new(Point {x: 1, y: 2}));
  33     (*(*p).borrow_mut()).x = 3;
  34     (*(*p).borrow_mut()).y += 3;
  35     assert_eq!(*(*p).borrow(), Point {x: 3, y: 5});
  36
  37     let v = Rc::new(RefCell::new(vec![1, 2, 3]));
  38     (*(*v).borrow_mut())[0] = 3;
  39     (*(*v).borrow_mut())[1] += 3;
  40     assert_eq!(((*(*v).borrow())[0],
  41                 (*(*v).borrow())[1],
  42                 (*(*v).borrow())[2]), (3, 5, 3));
  43 }