Crate pin_project
source ·Expand description
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
An attribute that would create a projection struct covering all the fields.