The perils of pinning

Posted Sep 16, 2022 22:34 UTC (Fri) by ssokolow (guest, #94568)
In reply to: The perils of pinning by mathstuf
Parent article: The perils of pinning

I'm not sure about the details in C++, so I don't know how they differ, but there's been interest and discussion around designing something placement new-like for Rust for a long time.

(The earliest RFC I could find in a quick search was #1228 from two months after Rust 1.0 in 2015, and it's clearly a continuation of plans for placement new already in progress.

My impression is that it just keeps getting bumped down the priority queue in favour of higher-demand/ROI things like support for C-style untagged unions in the FFI side of things (yes, they weren't present in stable-channel Rust until version 1.19), async/await, GATs, and so on.

(caniuse.rs is a good way to quickly get an overview of what got stabilized when and The Unstable Book is a good overview of the compiler features that are currently implemented for some definition of "implemented" but haven't been committed to stable channel and the language stability promise.)