src/test/ui/packed/packed-struct-generic-layout.rs

   1 // run-pass
   2 #![allow(dead_code)]
   3 #![allow(overflowing_literals)]
   4
   5
   6 use std::mem;
   7
   8 #[repr(packed)]
   9 struct S<T, S> {
  10     a: T,
  11     b: u8,
  12     c: S
  13 }
  14
  15 pub fn main() {
  16     unsafe {
  17         let s = S { a: 0xff_ff_ff_ffu32, b: 1, c: 0xaa_aa_aa_aa as i32 };
  18         let transd : [u8; 9] = mem::transmute(s);
  19         // Don't worry about endianness, the numbers are palindromic.
  20         assert_eq!(transd,
  21                    [0xff, 0xff, 0xff, 0xff,
  22                     1,
  23                     0xaa, 0xaa, 0xaa, 0xaa]);
  24
  25
  26         let s = S { a: 1u8, b: 2u8, c: 0b10000001_10000001 as i16};
  27         let transd : [u8; 4] = mem::transmute(s);
  28         // Again, no endianness problems.
  29         assert_eq!(transd,
  30                    [1, 2, 0b10000001, 0b10000001]);
  31     }
  32 }