Comments (3)
I'm reading https://doc.rust-lang.org/nightly/core/pin/index.html, it will take me a while.
My goal was: Something like https://doc.rust-lang.org/nightly/core/pin/index.html#example-self-referential-struct, but not in a Box
(to be no_std
& heapless). But I may see a way; if I need more help, I'll ask.
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Hi, and thanks for your interest in Selfie!
Even though you closed the issue I'm still going to answer your initial question, I think this will help, and also I believe it highlights weaknesses in the documentation.
For the part about putting a Selfie in a struct, here is how it would look like (using a Box for simplicity):
pub struct Outer {
inner: Selfie<'static, Box<[u8; 8]>, Ref<[u8]>>,
}
The generic lifetime of a Selfie
(or SelfieMut
) is actually the lifetime of the "owned" pointer P
. If you actually own what's behind P
, then it's just a 'static
lifetime.
You can also move that struct (both Outer
and the inner
selfie field) freely: the Box
here is what's guaranteeing that your data isn't moving (or any pinned pointer).
As for a no_std
& heapless solution, Selfie
is not actually the one that provides the non-movable guarantee of the data, that's the role of the pointer type P
. Many pointer types provide this capability (behind the StableDeref
trait), but if you're comfortable with your Selfie
being non-static, a simple &
reference will also work as a stable pointer:
pub struct Outer<'a> {
inner: Selfie<'a, &'a [u8; 8], Ref<[u8]>>,
}
fn do_thing_with_outer(outer: Outer) { todo!() }
fn main() {
let not_moving_data = [0; 8];
let outer = Outer {
inner: Selfie::new(Pin::new(¬_moving_data), |data| &data[4..])
};
// Outer can be moved here, no problem as long as not_moving_data is still alive
do_thing_with_outer(outer);
}
Hope this helps! 🙂
from selfie.
Thank you. I realized that I don't need lazy/interior mutability for now. But I'll remember Selfie
.
Thank you also for MIRI GitHub actions config. I'm using it with my project to check unsafe
.
from selfie.
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