src/test/run-pass/enum-discrim-manual-sizing.rs

   1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11
  12 use std::mem::{size_of, align_of};
  13
  14 #[repr(i8)]
  15 enum Ei8 {
  16     Ai8 = 0,
  17     Bi8 = 1
  18 }
  19
  20 #[repr(u8)]
  21 enum Eu8 {
  22     Au8 = 0,
  23     Bu8 = 1
  24 }
  25
  26 #[repr(i16)]
  27 enum Ei16 {
  28     Ai16 = 0,
  29     Bi16 = 1
  30 }
  31
  32 #[repr(u16)]
  33 enum Eu16 {
  34     Au16 = 0,
  35     Bu16 = 1
  36 }
  37
  38 #[repr(i32)]
  39 enum Ei32 {
  40     Ai32 = 0,
  41     Bi32 = 1
  42 }
  43
  44 #[repr(u32)]
  45 enum Eu32 {
  46     Au32 = 0,
  47     Bu32 = 1
  48 }
  49
  50 #[repr(i64)]
  51 enum Ei64 {
  52     Ai64 = 0,
  53     Bi64 = 1
  54 }
  55
  56 #[repr(u64)]
  57 enum Eu64 {
  58     Au64 = 0,
  59     Bu64 = 1
  60 }
  61
  62 #[repr(isize)]
  63 enum Eint {
  64     Aint = 0,
  65     Bint = 1
  66 }
  67
  68 #[repr(usize)]
  69 enum Euint {
  70     Auint = 0,
  71     Buint = 1
  72 }
  73
  74 #[repr(u8)]
  75 enum Eu8NonCLike<T> {
  76     _None,
  77     _Some(T),
  78 }
  79
  80 #[repr(i64)]
  81 enum Ei64NonCLike<T> {
  82     _None,
  83     _Some(T),
  84 }
  85
  86 #[repr(u64)]
  87 enum Eu64NonCLike<T> {
  88     _None,
  89     _Some(T),
  90 }
  91
  92 pub fn main() {
  93     assert_eq!(size_of::<Ei8>(), 1);
  94     assert_eq!(size_of::<Eu8>(), 1);
  95     assert_eq!(size_of::<Ei16>(), 2);
  96     assert_eq!(size_of::<Eu16>(), 2);
  97     assert_eq!(size_of::<Ei32>(), 4);
  98     assert_eq!(size_of::<Eu32>(), 4);
  99     assert_eq!(size_of::<Ei64>(), 8);
 100     assert_eq!(size_of::<Eu64>(), 8);
 101     assert_eq!(size_of::<Eint>(), size_of::<isize>());
 102     assert_eq!(size_of::<Euint>(), size_of::<usize>());
 103     assert_eq!(size_of::<Eu8NonCLike<()>>(), 1);
 104     assert_eq!(size_of::<Ei64NonCLike<()>>(), 8);
 105     assert_eq!(size_of::<Eu64NonCLike<()>>(), 8);
 106     let u8_expected_size = round_up(9, align_of::<Eu64NonCLike<u8>>());
 107     assert_eq!(size_of::<Eu64NonCLike<u8>>(), u8_expected_size);
 108     let array_expected_size = round_up(28, align_of::<Eu64NonCLike<[u32; 5]>>());
 109     assert_eq!(size_of::<Eu64NonCLike<[u32; 5]>>(), array_expected_size);
 110     assert_eq!(size_of::<Eu64NonCLike<[u32; 6]>>(), 32);
 111 }
 112
 113 // Rounds x up to the next multiple of a
 114 fn round_up(x: usize, a: usize) -> usize {
 115     ((x + (a - 1)) / a) * a
 116 }