Macro testaso::testaso

macro_rules! testaso {
    (@off $name:path=>$field:ident) => { ... };
    ($(struct $name:path: $align:expr, $size:expr => { $($field:ident: $offset:expr),* })+) => { ... };
}

Macro to test alignment, size and offsets of structs

Examples

#[repr(C)]
struct Simple {
    a: u32,
    b: [u8; 2],
    c: i64,
}

#[repr(C, packed)]
struct SimplePacked {
    a: u32,
    b: [u8; 2],
    c: i64,
}

#[cfg(test)]
mod test {
    use testaso::testaso;

    use super::Simple;
    use super::SimplePacked;

    testaso! {
        struct Simple: 8, 16 => {
            a: 0,
            b: 4,
            c: 8
        }

        struct SimplePacked: 1, 14 => {
            a: 0,
            b: 4,
            c: 6
        }
    }
}