#mem #offset #offset_of #offsetof

memoffset

offset_of functionality for Rust structs

3 unstable releases

0.2.1 Jan 15, 2018
0.2.0 Jan 13, 2018
0.1.0 Oct 17, 2017

#2 in No standard library

Download history 25139/week @ 2018-05-06 32245/week @ 2018-05-13 30713/week @ 2018-05-20 28925/week @ 2018-05-27 29993/week @ 2018-06-03 31467/week @ 2018-06-10 27677/week @ 2018-06-17 28607/week @ 2018-06-24 29433/week @ 2018-07-01 28769/week @ 2018-07-08 32033/week @ 2018-07-15 31598/week @ 2018-07-22 26009/week @ 2018-07-29

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memoffset

C-Like offset_of functionality for Rust structs.

Introduces the following macros:

  • offset_of! for obtaining the offset of a member of a struct.
  • span_of! for obtaining the range that a field, or fields, span.

memoffset works under no_std environments.

Usage

Add the following dependency to your Cargo.toml:

[dependencies]
memoffset = "0.2"

Add the following lines at the top of your main.rs or lib.rs files.

#[macro_use]
extern crate memoffset;

Examples

#[repr(C, packed)]
struct Foo {
	a: u32,
	b: u32,
	c: [u8; 5],
	d: u32,
}

assert_eq!(offset_of!(Foo, b), 4);
assert_eq!(offset_of!(Foo, c[3]), 11);

assert_eq!(span_of!(Foo, a),          0..4);
assert_eq!(span_of!(Foo, a ..  c),    0..8);
assert_eq!(span_of!(Foo, a ..  c[1]), 0..9);
assert_eq!(span_of!(Foo, a ..= c[1]), 0..10);
assert_eq!(span_of!(Foo, ..= d),      0..14);
assert_eq!(span_of!(Foo, b ..),       4..17);
MIT license
  • No runtime deps

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