packed-struct-address-of-element.rs

//@ run-pass
#![allow(dead_code)]
#![feature(raw_ref_op)]
//@ ignore-emscripten weird assertion?

#[repr(packed)]
struct Foo1 {
    bar: u8,
    baz: usize
}

#[repr(packed(2))]
struct Foo2 {
    bar: u8,
    baz: usize
}

#[repr(C, packed(4))]
struct Foo4C {
    bar: u8,
    baz: usize
}

pub fn main() {
    let foo = Foo1 { bar: 1, baz: 2 };
    let brw = &raw const foo.baz;
    unsafe { assert_eq!(brw.read_unaligned(), 2); }

    let foo = Foo2 { bar: 1, baz: 2 };
    let brw = &raw const foo.baz;
    unsafe { assert_eq!(brw.read_unaligned(), 2); }

    let mut foo = Foo4C { bar: 1, baz: 2 };
    let brw = &raw mut foo.baz;
    unsafe { assert_eq!(brw.read_unaligned(), 2); }
}