150 lines
3.2 KiB
Rust
150 lines
3.2 KiB
Rust
use core::any::*;
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#[derive(PartialEq, Debug)]
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struct Test;
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static TEST: &'static str = "Test";
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#[test]
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fn any_referenced() {
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let (a, b, c) = (&5 as &dyn Any, &TEST as &dyn Any, &Test as &dyn Any);
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assert!(a.is::<i32>());
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assert!(!b.is::<i32>());
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assert!(!c.is::<i32>());
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assert!(!a.is::<&'static str>());
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assert!(b.is::<&'static str>());
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assert!(!c.is::<&'static str>());
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assert!(!a.is::<Test>());
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assert!(!b.is::<Test>());
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assert!(c.is::<Test>());
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}
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#[test]
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fn any_owning() {
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let (a, b, c) = (
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Box::new(5_usize) as Box<dyn Any>,
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Box::new(TEST) as Box<dyn Any>,
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Box::new(Test) as Box<dyn Any>,
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);
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assert!(a.is::<usize>());
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assert!(!b.is::<usize>());
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assert!(!c.is::<usize>());
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assert!(!a.is::<&'static str>());
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assert!(b.is::<&'static str>());
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assert!(!c.is::<&'static str>());
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assert!(!a.is::<Test>());
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assert!(!b.is::<Test>());
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assert!(c.is::<Test>());
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}
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#[test]
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fn any_downcast_ref() {
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let a = &5_usize as &dyn Any;
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match a.downcast_ref::<usize>() {
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Some(&5) => {}
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x => panic!("Unexpected value {x:?}"),
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}
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match a.downcast_ref::<Test>() {
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None => {}
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x => panic!("Unexpected value {x:?}"),
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}
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}
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#[test]
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fn any_downcast_mut() {
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let mut a = 5_usize;
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let mut b: Box<_> = Box::new(7_usize);
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let a_r = &mut a as &mut dyn Any;
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let tmp: &mut usize = &mut *b;
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let b_r = tmp as &mut dyn Any;
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match a_r.downcast_mut::<usize>() {
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Some(x) => {
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assert_eq!(*x, 5);
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*x = 612;
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}
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x => panic!("Unexpected value {x:?}"),
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}
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match b_r.downcast_mut::<usize>() {
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Some(x) => {
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assert_eq!(*x, 7);
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*x = 413;
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}
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x => panic!("Unexpected value {x:?}"),
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}
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match a_r.downcast_mut::<Test>() {
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None => (),
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x => panic!("Unexpected value {x:?}"),
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}
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match b_r.downcast_mut::<Test>() {
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None => (),
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x => panic!("Unexpected value {x:?}"),
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}
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match a_r.downcast_mut::<usize>() {
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Some(&mut 612) => {}
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x => panic!("Unexpected value {x:?}"),
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}
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match b_r.downcast_mut::<usize>() {
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Some(&mut 413) => {}
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x => panic!("Unexpected value {x:?}"),
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}
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}
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#[test]
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fn any_fixed_vec() {
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let test = [0_usize; 8];
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let test = &test as &dyn Any;
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assert!(test.is::<[usize; 8]>());
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assert!(!test.is::<[usize; 10]>());
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}
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#[test]
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fn any_unsized() {
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fn is_any<T: Any + ?Sized>() {}
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is_any::<[i32]>();
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}
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#[test]
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fn distinct_type_names() {
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// https://github.com/rust-lang/rust/issues/84666
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struct Velocity(#[allow(dead_code)] f32, #[allow(dead_code)] f32);
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fn type_name_of_val<T>(_: T) -> &'static str {
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type_name::<T>()
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}
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assert_ne!(type_name_of_val(Velocity), type_name_of_val(Velocity(0.0, -9.8)),);
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}
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#[test]
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fn dyn_type_name() {
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trait Foo {
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type Bar;
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}
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assert_eq!(
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"dyn core::ops::function::Fn(i32, i32) -> i32",
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std::any::type_name::<dyn Fn(i32, i32) -> i32>()
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);
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assert_eq!(
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"dyn coretests::any::dyn_type_name::Foo<Bar = i32> \
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+ core::marker::Send + core::marker::Sync",
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std::any::type_name::<dyn Foo<Bar = i32> + Send + Sync>()
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);
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}
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