user0/rust
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Rollup merge of #47892 - Badel2:const_type_id_of, r=oli-obk

Browse source 
Turn `type_id` into a constant intrinsic

https://github.com/rust-lang/rust/issues/27745

The method `get_type_id` in `Any` is intended to support reflection. It's currently unstable in favor of using an associated constant instead. This PR makes the `type_id` intrinsic a constant intrinsic, the same as `size_of` and `align_of`, allowing `TypeId::of` to be a `const fn`, which will allow using an associated constant in `Any`.
This commit is contained in:
kennytm 2018-02-05 01:27:36 +08:00
commit e17ebdf344
No known key found for this signature in database
GPG key ID: FEF6C8051D0E013C
8 changed files with 105 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

18
src/test/compile-fail/const-typeid-of.rs Normal file
View file

@ -0,0 +1,18 @@
// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::any::TypeId;
struct A;
fn main() {
const A_ID: TypeId = TypeId::of::<A>();
//~^ ERROR `std::any::TypeId::of` is not yet stable as a const fn
}