commit | 41f53a7b2311ba3bfece38a5ae473912cf7b5312 | [log] [tgz] |
---|---|---|
author | William Escande <wescande@google.com> | Mon Aug 22 11:27:56 2022 -0700 |
committer | William Escande <wescande@google.com> | Mon Aug 22 11:27:56 2022 -0700 |
tree | fbd0d683b85a5b7f16cebc8ebf609887df552ed1 | |
parent | 33b450ea942b38ee30d6f51108d4280134e63fcd [diff] |
[Bluetooth apex] Use new apex name The Bluetooth apex name is now called com.android.btservices Bug: 243054261 Test: Build Change-Id: I0e5dcc74517a0b90eee84a58bb3bfd9b300e45b9
C-Like offset_of
functionality for Rust structs.
Introduces the following macros:
offset_of!
for obtaining the offset of a member of a struct.offset_of_tuple!
for obtaining the offset of a member of a tuple. (Requires Rust 1.20+)span_of!
for obtaining the range that a field, or fields, span.memoffset
works under no_std
environments.
Add the following dependency to your Cargo.toml
:
[dependencies] memoffset = "0.6"
These versions will compile fine with rustc versions greater or equal to 1.19.
use memoffset::{offset_of, span_of}; #[repr(C, packed)] struct Foo { a: u32, b: u32, c: [u8; 5], d: u32, } fn main() { assert_eq!(offset_of!(Foo, b), 4); assert_eq!(offset_of!(Foo, d), 4+4+5); assert_eq!(span_of!(Foo, a), 0..4); assert_eq!(span_of!(Foo, a .. c), 0..8); assert_eq!(span_of!(Foo, a ..= c), 0..13); assert_eq!(span_of!(Foo, ..= d), 0..17); assert_eq!(span_of!(Foo, b ..), 4..17); }
memoffset
has experimental support for compile-time offset_of!
on a nightly compiler.
In order to use it, you must enable the unstable_const
crate feature and several compiler features.
Cargo.toml:
[dependencies.memoffset] version = "0.6" features = ["unstable_const"]
Your crate root: (lib.rs
/main.rs
)
#![feature(const_ptr_offset_from, const_refs_to_cell)]