src/liballoc/boxed_test.rs

   1 // Copyright 2012-2015 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 //! Test for `boxed` mod.
  12
  13 use core::any::Any;
  14 use core::ops::Deref;
  15 use core::result::Result::{Ok, Err};
  16 use core::clone::Clone;
  17
  18 use std::boxed;
  19 use std::boxed::Box;
  20
  21 #[test]
  22 fn test_owned_clone() {
  23     let a = Box::new(5);
  24     let b: Box<i32> = a.clone();
  25     assert!(a == b);
  26 }
  27
  28 #[derive(PartialEq, Eq)]
  29 struct Test;
  30
  31 #[test]
  32 fn any_move() {
  33     let a = Box::new(8) as Box<Any>;
  34     let b = Box::new(Test) as Box<Any>;
  35
  36     match a.downcast::<i32>() {
  37         Ok(a) => { assert!(a == Box::new(8)); }
  38         Err(..) => panic!()
  39     }
  40     match b.downcast::<Test>() {
  41         Ok(a) => { assert!(a == Box::new(Test)); }
  42         Err(..) => panic!()
  43     }
  44
  45     let a = Box::new(8) as Box<Any>;
  46     let b = Box::new(Test) as Box<Any>;
  47
  48     assert!(a.downcast::<Box<Test>>().is_err());
  49     assert!(b.downcast::<Box<i32>>().is_err());
  50 }
  51
  52 #[test]
  53 fn test_show() {
  54     let a = Box::new(8) as Box<Any>;
  55     let b = Box::new(Test) as Box<Any>;
  56     let a_str = format!("{:?}", a);
  57     let b_str = format!("{:?}", b);
  58     assert_eq!(a_str, "Any");
  59     assert_eq!(b_str, "Any");
  60
  61     static EIGHT: usize = 8;
  62     static TEST: Test = Test;
  63     let a = &EIGHT as &Any;
  64     let b = &TEST as &Any;
  65     let s = format!("{:?}", a);
  66     assert_eq!(s, "Any");
  67     let s = format!("{:?}", b);
  68     assert_eq!(s, "Any");
  69 }
  70
  71 #[test]
  72 fn deref() {
  73     fn homura<T: Deref<Target=i32>>(_: T) { }
  74     homura(Box::new(765));
  75 }
  76
  77 #[test]
  78 fn raw_sized() {
  79     let x = Box::new(17);
  80     let p = Box::into_raw(x);
  81     unsafe {
  82         assert_eq!(17, *p);
  83         *p = 19;
  84         let y = Box::from_raw(p);
  85         assert_eq!(19, *y);
  86     }
  87 }
  88
  89 #[test]
  90 fn raw_trait() {
  91     trait Foo {
  92         fn get(&self) -> u32;
  93         fn set(&mut self, value: u32);
  94     }
  95
  96     struct Bar(u32);
  97
  98     impl Foo for Bar {
  99         fn get(&self) -> u32 {
 100             self.0
 101         }
 102
 103         fn set(&mut self, value: u32) {
 104             self.0 = value;
 105         }
 106     }
 107
 108     let x: Box<Foo> = Box::new(Bar(17));
 109     let p = Box::into_raw(x);
 110     unsafe {
 111         assert_eq!(17, (*p).get());
 112         (*p).set(19);
 113         let y: Box<Foo> = Box::from_raw(p);
 114         assert_eq!(19, y.get());
 115     }
 116 }