commit | eb98f8ade7c3f34f9c8fdbcdf6bdcef10446c541 | [log] [tgz] |
---|---|---|
author | Bob Badour <bbadour@google.com> | Fri Feb 05 23:17:09 2021 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Fri Feb 05 23:17:09 2021 +0000 |
tree | 218633c2aae707a213c8ef172c35187cc41d4012 | |
parent | f14d6a686a8e9eb9359369569e06983a10e5d694 [diff] | |
parent | 3d9fec4109174caf19fe3ea48c494d0b0d688749 [diff] |
[LSC] Add LOCAL_LICENSE_KINDS to external/rust/crates/pin-project am: 48ec74af36 am: fde893fb75 am: 2ac39595be am: 3d9fec4109 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/pin-project/+/1575951 MUST ONLY BE SUBMITTED BY AUTOMERGER Change-Id: I275d49befbb372c195538ac6935427b564a071a9
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.