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) => {
  38             assert!(a == Box::new(8));
  39         }
  40         Err(..) => panic!(),
  41     }
  42     match b.downcast::<Test>() {
  43         Ok(a) => {
  44             assert!(a == Box::new(Test));
  45         }
  46         Err(..) => panic!(),
  47     }
  48
  49     let a = Box::new(8) as Box<Any>;
  50     let b = Box::new(Test) as Box<Any>;
  51
  52     assert!(a.downcast::<Box<Test>>().is_err());
  53     assert!(b.downcast::<Box<i32>>().is_err());
  54 }
  55
  56 #[test]
  57 fn test_show() {
  58     let a = Box::new(8) as Box<Any>;
  59     let b = Box::new(Test) as Box<Any>;
  60     let a_str = format!("{:?}", a);
  61     let b_str = format!("{:?}", b);
  62     assert_eq!(a_str, "Any");
  63     assert_eq!(b_str, "Any");
  64
  65     static EIGHT: usize = 8;
  66     static TEST: Test = Test;
  67     let a = &EIGHT as &Any;
  68     let b = &TEST as &Any;
  69     let s = format!("{:?}", a);
  70     assert_eq!(s, "Any");
  71     let s = format!("{:?}", b);
  72     assert_eq!(s, "Any");
  73 }
  74
  75 #[test]
  76 fn deref() {
  77     fn homura<T: Deref<Target = i32>>(_: T) {}
  78     homura(Box::new(765));
  79 }
  80
  81 #[test]
  82 fn raw_sized() {
  83     let x = Box::new(17);
  84     let p = Box::into_raw(x);
  85     unsafe {
  86         assert_eq!(17, *p);
  87         *p = 19;
  88         let y = Box::from_raw(p);
  89         assert_eq!(19, *y);
  90     }
  91 }
  92
  93 #[test]
  94 fn raw_trait() {
  95     trait Foo {
  96         fn get(&self) -> u32;
  97         fn set(&mut self, value: u32);
  98     }
  99
 100     struct Bar(u32);
 101
 102     impl Foo for Bar {
 103         fn get(&self) -> u32 {
 104             self.0
 105         }
 106
 107         fn set(&mut self, value: u32) {
 108             self.0 = value;
 109         }
 110     }
 111
 112     let x: Box<Foo> = Box::new(Bar(17));
 113     let p = Box::into_raw(x);
 114     unsafe {
 115         assert_eq!(17, (*p).get());
 116         (*p).set(19);
 117         let y: Box<Foo> = Box::from_raw(p);
 118         assert_eq!(19, y.get());
 119     }
 120 }