src/test/ui/run-pass/structs-enums/enum-discrim-width-stuff.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 // run-pass
  12 #![allow(overflowing_literals)]
  13 #![allow(dead_code)]
  14
  15 macro_rules! check {
  16     ($m:ident, $t:ty, $v:expr) => {{
  17         mod $m {
  18             use std::mem::size_of;
  19             #[derive(Copy, Clone, Debug)]
  20             enum E {
  21                 V = $v,
  22                 A = 0
  23             }
  24             static C: E = E::V;
  25             pub fn check() {
  26                 assert_eq!(size_of::<E>(), size_of::<$t>());
  27                 assert_eq!(E::V as $t, $v as $t);
  28                 assert_eq!(C as $t, $v as $t);
  29                 assert_eq!(format!("{:?}", E::V), "V".to_string());
  30                 assert_eq!(format!("{:?}", C), "V".to_string());
  31             }
  32         }
  33         $m::check();
  34     }}
  35 }
  36
  37 pub fn main() {
  38     check!(a, u8, 0x17);
  39     check!(b, u8, 0xe8);
  40     check!(c, u16, 0x1727);
  41     check!(d, u16, 0xe8d8);
  42     check!(e, u32, 0x17273747);
  43     check!(f, u32, 0xe8d8c8b8);
  44
  45     check!(z, i8, 0x17);
  46     check!(y, i8, -0x17);
  47     check!(x, i16, 0x1727);
  48     check!(w, i16, -0x1727);
  49     check!(v, i32, 0x17273747);
  50     check!(u, i32, -0x17273747);
  51
  52     enum Simple { A, B }
  53     assert_eq!(::std::mem::size_of::<Simple>(), 1);
  54 }