Size Of No Padding

This crate provides the derive proc macro SizeOfNoPadding, it will generate size_of_no_padding() method for your struct or union which can calcuate the size of struct or union without padding even if it is not marked as #[repr(packed)].

Example

use size_of_no_padding::SizeOfNoPadding;

#[derive(SizeOfNoPadding)]
struct Abc {
    a: u8,
    b: u32,
    c: u8,
}

fn main() {
    assert_eq!(8, std::mem::size_of::<Abc>());
    assert_eq!(6, Abc::size_of_no_padding());
}

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.