commit | c694fc9d044796eb31ecf3456938c2bdc860eee9 | [log] [tgz] |
---|---|---|
author | Xin Li <delphij@google.com> | Sat Feb 20 12:07:50 2021 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Sat Feb 20 12:07:50 2021 +0000 |
tree | fab3ccd02528b84de00a71f92d4227371cf94641 | |
parent | 0d9f02f3bd1474b29ebe2fa4b17f1b7a1e83033f [diff] | |
parent | 0d97f8800e7190959b0c0b2e027ff38cfe22bbd1 [diff] |
[automerger skipped] Mark ab/7061308 as merged in stage. am: 5d2e6582b1 -s ours am: 0d97f8800e -s ours am skip reason: Change-Id I91c22b513ac9e7c1c97f55c22d60352e2ce4e605 with SHA-1 4dd54eb67e is in history Original change: undetermined MUST ONLY BE SUBMITTED BY AUTOMERGER Change-Id: I7e0a2e5b521d26627d0d99f46fc6203dc51420ee
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.