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//! Test for `boxed` mod.
use core::any::Any;
use core::ops::Deref;
use std::boxed::Box;
#[test]
fn test_owned_clone() {
let a = Box::new(5);
let b: Box<i32> = a.clone();
assert!(a == b);
}
#[derive(Debug, PartialEq, Eq)]
struct Test;
#[test]
fn any_move() {
let a = Box::new(8) as Box<dyn Any>;
let b = Box::new(Test) as Box<dyn Any>;
let a: Box<i32> = a.downcast::<i32>().unwrap();
assert_eq!(*a, 8);
let b: Box<Test> = b.downcast::<Test>().unwrap();
assert_eq!(*b, Test);
let a = Box::new(8) as Box<dyn Any>;
let b = Box::new(Test) as Box<dyn Any>;
assert!(a.downcast::<Box<i32>>().is_err());
assert!(b.downcast::<Box<Test>>().is_err());
}
#[test]
fn test_show() {
let a = Box::new(8) as Box<dyn Any>;
let b = Box::new(Test) as Box<dyn Any>;
let a_str = format!("{a:?}");
let b_str = format!("{b:?}");
assert_eq!(a_str, "Any { .. }");
assert_eq!(b_str, "Any { .. }");
static EIGHT: usize = 8;
static TEST: Test = Test;
let a = &EIGHT as &dyn Any;
let b = &TEST as &dyn Any;
let s = format!("{a:?}");
assert_eq!(s, "Any { .. }");
let s = format!("{b:?}");
assert_eq!(s, "Any { .. }");
}
#[test]
fn deref() {
fn homura<T: Deref<Target = i32>>(_: T) {}
homura(Box::new(765));
}
#[test]
fn raw_sized() {
let x = Box::new(17);
let p = Box::into_raw(x);
unsafe {
assert_eq!(17, *p);
*p = 19;
let y = Box::from_raw(p);
assert_eq!(19, *y);
}
}
#[test]
fn raw_trait() {
trait Foo {
fn get(&self) -> u32;
fn set(&mut self, value: u32);
}
struct Bar(u32);
impl Foo for Bar {
fn get(&self) -> u32 {
self.0
}
fn set(&mut self, value: u32) {
self.0 = value;
}
}
let x: Box<dyn Foo> = Box::new(Bar(17));
let p = Box::into_raw(x);
unsafe {
assert_eq!(17, (*p).get());
(*p).set(19);
let y: Box<dyn Foo> = Box::from_raw(p);
assert_eq!(19, y.get());
}
}
#[test]
fn f64_slice() {
let slice: &[f64] = &[-1.0, 0.0, 1.0, f64::INFINITY];
let boxed: Box<[f64]> = Box::from(slice);
assert_eq!(&*boxed, slice)
}
#[test]
fn i64_slice() {
let slice: &[i64] = &[i64::MIN, -2, -1, 0, 1, 2, i64::MAX];
let boxed: Box<[i64]> = Box::from(slice);
assert_eq!(&*boxed, slice)
}
#[test]
fn str_slice() {
let s = "Hello, world!";
let boxed: Box<str> = Box::from(s);
assert_eq!(&*boxed, s)
}
#[test]
fn boxed_slice_from_iter() {
let iter = 0..100;
let boxed: Box<[u32]> = iter.collect();
assert_eq!(boxed.len(), 100);
assert_eq!(boxed[7], 7);
}
#[test]
fn test_array_from_slice() {
let v = vec![1, 2, 3];
let r: Box<[u32]> = v.into_boxed_slice();
let a: Result<Box<[u32; 3]>, _> = r.clone().try_into();
assert!(a.is_ok());
let a: Result<Box<[u32; 2]>, _> = r.clone().try_into();
assert!(a.is_err());
}
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