| commit | 78b8efb9074654a6f8bf8698cf1285bd38d8624f | [log] [tgz] |
|---|---|---|
| author | Dmitry Avershin <[email protected]> | Tue Aug 27 09:27:10 2024 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Tue Aug 27 09:27:10 2024 +0000 |
| tree | 09dfecc0e6198af448ca36e886435456edcdafde | |
| parent | 2b86023b5b370b318711c970f1b6e45809e1e6f4 [diff] | |
| parent | 92b31850aadb67879dc781f7d4d7802707feac19 [diff] |
Marks pin_project available in OEM apexes. am: 92b31850aa Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/pin-project/+/3244140 Change-Id: I677604269fe6a418e35657137e79698923d10f9d Signed-off-by: Automerger Merge Worker <[email protected]>
A crate for safe and ergonomic pin-projection.
Add this to your Cargo.toml:
[dependencies] pin-project = "1"
Compiler support: requires rustc 1.56+
#[pin_project] attribute creates projection types covering all the fields of struct or enum.
use std::pin::Pin; use pin_project::pin_project; #[pin_project] struct Struct<T, U> { #[pin] pinned: T, unpinned: U, } impl<T, U> Struct<T, U> { fn method(self: Pin<&mut Self>) { let this = self.project(); let _: Pin<&mut T> = this.pinned; // Pinned reference to the field let _: &mut U = this.unpinned; // Normal reference to the field } }
code like this will be generated
To use #[pin_project] on enums, you need to name the projection type returned from the method.
use std::pin::Pin; use pin_project::pin_project; #[pin_project(project = EnumProj)] enum Enum<T, U> { Pinned(#[pin] T), Unpinned(U), } impl<T, U> Enum<T, U> { fn method(self: Pin<&mut Self>) { match self.project() { EnumProj::Pinned(x) => { let _: Pin<&mut T> = x; } EnumProj::Unpinned(y) => { let _: &mut U = y; } } } }
code like this will be generated
See #[pin_project] attribute for more details, and see examples directory for more examples and generated code.
Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
