a8e3ce50b9
Support arrays in type reflection Tracking issue: rust-lang/rust#146922 This PR adds support for inspecting arrays `[T; N]` through type reflection. It does so by adding `TypeKind::Array` and the `Array` struct: ```rust pub struct Array { pub element_ty: TypeId, pub len: usize, } ``` This can be used to inspect arrays like so: ```rust match const { Type::of::<[u16; 4]>() }.kind { TypeKind::Array(array) => { assert_eq!(array.element_ty, TypeId::of::<u16>()); assert_eq!(array.len, 4); } _ => unreachable!(), } ``` r? @oli-obk
33 lines
810 B
Rust
33 lines
810 B
Rust
#![feature(type_info)]
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//@ run-pass
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//@ check-run-results
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#![allow(dead_code)]
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use std::mem::type_info::Type;
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struct Foo {
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a: u32,
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}
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enum Bar {
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Some(u32),
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None,
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Foomp { a: (), b: &'static str },
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}
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struct Unsized {
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x: u16,
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s: str,
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}
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fn main() {
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println!("{:#?}", const { Type::of::<(u8, u8, ())>() }.kind);
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println!("{:#?}", const { Type::of::<[u8; 2]>() }.kind);
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println!("{:#?}", const { Type::of::<Foo>() }.kind);
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println!("{:#?}", const { Type::of::<Bar>() }.kind);
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println!("{:#?}", const { Type::of::<&Unsized>() }.kind);
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println!("{:#?}", const { Type::of::<&str>() }.kind);
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println!("{:#?}", const { Type::of::<&[u8]>() }.kind);
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println!("{:#?}", const { Type::of::<str>() }.kind);
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println!("{:#?}", const { Type::of::<[u8]>() }.kind);
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}
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