src/test/run-pass/packed-tuple-struct-size.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;
  13
  14 #[repr(packed)]
  15 struct S4(u8,[u8;  3]);
  16
  17 #[repr(packed)]
  18 struct S5(u8, u32);
  19
  20 #[repr(packed)]
  21 struct S13(i64, f32, u8);
  22
  23 enum Foo {
  24     Bar = 1,
  25     Baz = 2
  26 }
  27
  28 #[repr(packed)]
  29 struct S3_Foo(u8, u16, Foo);
  30
  31 #[repr(packed)]
  32 struct S7_Option(f32, u8, u16, Option<Box<f64>>);
  33
  34 pub fn main() {
  35     assert_eq!(mem::size_of::<S4>(), 4);
  36
  37     assert_eq!(mem::size_of::<S5>(), 5);
  38
  39     assert_eq!(mem::size_of::<S13>(), 13);
  40
  41     assert_eq!(mem::size_of::<S3_Foo>(),
  42                3 + mem::size_of::<Foo>());
  43
  44     assert_eq!(mem::size_of::<S7_Option>(),
  45               7 + mem::size_of::<Option<Box<f64>>>());
  46 }