| // Protocol Buffers - Google's data interchange format |
| // Copyright 2024 Google LLC. All rights reserved. |
| // |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file or at |
| // https://developers.google.com/open-source/licenses/bsd |
| |
| // Macro to create structs that will act as opaque pointees. These structs are |
| // never intended to be dereferenced in Rust. |
| // This is a workaround until stabilization of [`extern type`]. |
| // TODO: convert to extern type once stabilized. |
| // [`extern type`]: https://github.com/rust-lang/rust/issues/43467 |
| macro_rules! opaque_pointee { |
| ($name: ident) => { |
| #[repr(C)] |
| pub struct $name { |
| _data: [u8; 0], |
| _marker: std::marker::PhantomData<(*mut u8, std::marker::PhantomPinned)>, |
| } |
| }; |
| } |
| |
| pub(crate) use opaque_pointee; |