src/test/ui/structs-enums/enum-discrim-manual-sizing.rs

   1 // run-pass
   2 #![allow(dead_code)]
   3
   4 use std::mem::{size_of, align_of};
   5
   6 #[repr(i8)]
   7 enum Ei8 {
   8     Ai8 = 0,
   9     Bi8 = 1
  10 }
  11
  12 #[repr(u8)]
  13 enum Eu8 {
  14     Au8 = 0,
  15     Bu8 = 1
  16 }
  17
  18 #[repr(i16)]
  19 enum Ei16 {
  20     Ai16 = 0,
  21     Bi16 = 1
  22 }
  23
  24 #[repr(u16)]
  25 enum Eu16 {
  26     Au16 = 0,
  27     Bu16 = 1
  28 }
  29
  30 #[repr(i32)]
  31 enum Ei32 {
  32     Ai32 = 0,
  33     Bi32 = 1
  34 }
  35
  36 #[repr(u32)]
  37 enum Eu32 {
  38     Au32 = 0,
  39     Bu32 = 1
  40 }
  41
  42 #[repr(i64)]
  43 enum Ei64 {
  44     Ai64 = 0,
  45     Bi64 = 1
  46 }
  47
  48 #[repr(u64)]
  49 enum Eu64 {
  50     Au64 = 0,
  51     Bu64 = 1
  52 }
  53
  54 #[repr(isize)]
  55 enum Eint {
  56     Aint = 0,
  57     Bint = 1
  58 }
  59
  60 #[repr(usize)]
  61 enum Euint {
  62     Auint = 0,
  63     Buint = 1
  64 }
  65
  66 #[repr(u8)]
  67 enum Eu8NonCLike<T> {
  68     _None,
  69     _Some(T),
  70 }
  71
  72 #[repr(i64)]
  73 enum Ei64NonCLike<T> {
  74     _None,
  75     _Some(T),
  76 }
  77
  78 #[repr(u64)]
  79 enum Eu64NonCLike<T> {
  80     _None,
  81     _Some(T),
  82 }
  83
  84 pub fn main() {
  85     assert_eq!(size_of::<Ei8>(), 1);
  86     assert_eq!(size_of::<Eu8>(), 1);
  87     assert_eq!(size_of::<Ei16>(), 2);
  88     assert_eq!(size_of::<Eu16>(), 2);
  89     assert_eq!(size_of::<Ei32>(), 4);
  90     assert_eq!(size_of::<Eu32>(), 4);
  91     assert_eq!(size_of::<Ei64>(), 8);
  92     assert_eq!(size_of::<Eu64>(), 8);
  93     assert_eq!(size_of::<Eint>(), size_of::<isize>());
  94     assert_eq!(size_of::<Euint>(), size_of::<usize>());
  95     assert_eq!(size_of::<Eu8NonCLike<()>>(), 1);
  96     assert_eq!(size_of::<Ei64NonCLike<()>>(), 8);
  97     assert_eq!(size_of::<Eu64NonCLike<()>>(), 8);
  98     let u8_expected_size = round_up(9, align_of::<Eu64NonCLike<u8>>());
  99     assert_eq!(size_of::<Eu64NonCLike<u8>>(), u8_expected_size);
 100     let array_expected_size = round_up(28, align_of::<Eu64NonCLike<[u32; 5]>>());
 101     assert_eq!(size_of::<Eu64NonCLike<[u32; 5]>>(), array_expected_size);
 102     assert_eq!(size_of::<Eu64NonCLike<[u32; 6]>>(), 32);
 103
 104     assert_eq!(align_of::<Eu32>(), align_of::<u32>());
 105     assert_eq!(align_of::<Eu64NonCLike<u8>>(), align_of::<u64>());
 106 }
 107
 108 // Rounds x up to the next multiple of a
 109 fn round_up(x: usize, a: usize) -> usize {
 110     ((x + (a - 1)) / a) * a
 111 }