| commit | fbcfe5d464981d68a79f5be556533be875002609 | [log] [tgz] |
|---|---|---|
| author | Matthew Maurer <[email protected]> | Thu Mar 09 18:06:13 2023 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Thu Mar 09 18:06:13 2023 +0000 |
| tree | 63618c47b4bd4284d029fe1fcff06c0b4b6e7e00 | |
| parent | f41f2cc6af28ae55dda1858914049f4d0c13ba16 [diff] | |
| parent | 986eabe3b27dc4eb4c9d630a1996d53d518dc2f4 [diff] |
Make pin-project available to product and vendor am: f8587c23bb am: 2ca05f02fa am: aeb5fffb73 am: 986eabe3b2 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/pin-project/+/2476291 Change-Id: I245b300e432e5352f117030478c7f6b36c40f1e9 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 1.37+
#[pin_project] attribute creates projection types covering all the fields of struct or enum.
use pin_project::pin_project; use std::pin::Pin; #[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 pin_project::pin_project; use std::pin::Pin; #[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 documentation 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.
