denyhosts/clamav/libclamav_rust/.cargo/vendor/pin-project
2023-01-14 18:28:39 +08:00
..
examples 更新libclamav库1.0.0版本 2023-01-14 18:28:39 +08:00
src 更新libclamav库1.0.0版本 2023-01-14 18:28:39 +08:00
tests 更新libclamav库1.0.0版本 2023-01-14 18:28:39 +08:00
.cargo-checksum.json 更新libclamav库1.0.0版本 2023-01-14 18:28:39 +08:00
Cargo.lock 更新libclamav库1.0.0版本 2023-01-14 18:28:39 +08:00
Cargo.toml 更新libclamav库1.0.0版本 2023-01-14 18:28:39 +08:00
CHANGELOG.md 更新libclamav库1.0.0版本 2023-01-14 18:28:39 +08:00
LICENSE-APACHE 更新libclamav库1.0.0版本 2023-01-14 18:28:39 +08:00
LICENSE-MIT 更新libclamav库1.0.0版本 2023-01-14 18:28:39 +08:00
README.md 更新libclamav库1.0.0版本 2023-01-14 18:28:39 +08:00

pin-project

crates.io docs.rs license rustc build status

A crate for safe and ergonomic pin-projection.

Usage

Add this to your Cargo.toml:

[dependencies]
pin-project = "1"

Compiler support: requires rustc 1.37+

Examples

#[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.

  • pin-project-lite: A lightweight version of pin-project written with declarative macros.

License

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.