Crate pin_project

An attribute that would create a projection struct covering all the fields.

Examples

use pin_project::unsafe_project;
use std::marker::Unpin;
use std::pin::Pin;

#[unsafe_project]
struct Foo<T, U> {
    #[pin]
    future: T,
    field: U,
}

impl<T, U> Foo<T, U> {
    fn baz(mut self: Pin<&mut Self>) {
        let this = self.project();
        let _: Pin<&mut T> = this.future; // Pinned reference to the field
        let _: &mut U = this.field; // Normal reference to the field
    }
}

impl<T: Unpin, U> Unpin for Foo<T, U> {} // Conditional Unpin impl

Rust Version

The current version of pin-project requires Rust nightly 2018-12-26 or later.

Attribute Macros

unsafe_fields

An attribute that would create projections for each struct fields.

unsafe_project

An attribute that would create a projection struct covering all the fields.