rust/tests/ui/packed/packed-tuple-struct-layout.rs
2024-02-16 20:02:50 +00:00

24 lines
514 B
Rust

//@ run-pass
use std::mem;
#[repr(packed)]
#[allow(dead_code)]
struct S4(u8,[u8; 3]);
#[repr(packed)]
#[allow(dead_code)]
struct S5(u8,u32);
pub fn main() {
unsafe {
let s4 = S4(1, [2,3,4]);
let transd : [u8; 4] = mem::transmute(s4);
assert_eq!(transd, [1, 2, 3, 4]);
let s5 = S5(1, 0xff_00_00_ff);
let transd : [u8; 5] = mem::transmute(s5);
// Don't worry about endianness, the u32 is palindromic.
assert_eq!(transd, [1, 0xff, 0, 0, 0xff]);
}
}