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https://github.com/rust-lang/rust.git
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72a25d05bf
This updates the standard library's documentation to use the new syntax. The documentation is worthwhile to update as it should be more idiomatic (particularly for features like this, which are nice for users to get acquainted with). The general codebase is likely more hassle than benefit to update: it'll hurt git blame, and generally updates can be done by folks updating the code if (and when) that makes things more readable with the new format. A few places in the compiler and library code are updated (mostly just due to already having been done when this commit was first authored).
130 lines
2.8 KiB
Rust
130 lines
2.8 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 5_usize as Box<dyn Any>, box TEST as Box<dyn Any>, box Test as Box<dyn Any>);
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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 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(f32, 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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