| commit | 01940bbf280f9e9d60ca3ffda3daf2199da13f4f | [log] [tgz] |
|---|---|---|
| author | James Farrell <[email protected]> | Fri Aug 30 13:58:24 2024 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Fri Aug 30 13:58:24 2024 +0000 |
| tree | c93a8d21f04dac839395ed8a692c94d67fc85080 | |
| parent | 7b007c32abe362317b6fd2f9a3a75b242a32cbbb [diff] | |
| parent | ac8fdc26842f8ae4be908afb8dd10fdd83726099 [diff] |
Merge "Fix syntax error in cargo_embargo.json" into main am: ac8fdc2684 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/pin-project/+/3248627 Change-Id: I58eb0c7b6dfdbc6366611cc7fe01addfe836fb61 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.
