src/test/run-pass/packed-struct-vec.rs

   1 // Copyright 2013-2014 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 use std::fmt;
  12 use std::mem;
  13
  14 #[repr(packed)]
  15 #[derive(Copy, Clone)]
  16 struct Foo {
  17     bar: u8,
  18     baz: u64
  19 }
  20
  21 impl PartialEq for Foo {
  22     fn eq(&self, other: &Foo) -> bool {
  23         self.bar == other.bar && self.baz == other.baz
  24     }
  25 }
  26
  27 impl fmt::Debug for Foo {
  28     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  29         let bar = self.bar;
  30         let baz = self.baz;
  31
  32         f.debug_struct("Foo")
  33             .field("bar", &bar)
  34             .field("baz", &baz)
  35             .finish()
  36     }
  37 }
  38
  39 pub fn main() {
  40     let foos = [Foo { bar: 1, baz: 2 }; 10];
  41
  42     assert_eq!(mem::size_of::<[Foo; 10]>(), 90);
  43
  44     for i in 0..10 {
  45         assert_eq!(foos[i], Foo { bar: 1, baz: 2});
  46     }
  47
  48     for &foo in &foos {
  49         assert_eq!(foo, Foo { bar: 1, baz: 2 });
  50     }
  51 }