Feature gate: #![feature(offset_of_nested)]

This is a tracking issue for the use of nested field access in offset_of. This is currently implemented with dot-separated fields, like in C. The original RFC for offset_of was rust-lang/rfcs#3308.

Public API

pub macro offset_of($Container:ty, $($fields:expr)+ $(,)?) { ... }

struct Struct {
    field: A,
}
struct A {
    a: ((u8, u8), bool),
}
const OFFSET: usize = offset_of!(Struct, field.a.0.1);

Steps / History

• Implementation: Included in initial offset_of implementation
• Final comment period (FCP)¹
• Stabilization PR - Stabilize offset_of_nested #128284

Unresolved Questions

• None yet.