| // Copyright 2013 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| |
| |
| use std::mem; |
| |
| #[repr(packed)] |
| struct S4 { |
| a: u8, |
| b: [u8; 3], |
| } |
| |
| #[repr(packed)] |
| struct S5 { |
| a: u8, |
| b: u32 |
| } |
| |
| #[repr(packed)] |
| struct S13 { |
| a: i64, |
| b: f32, |
| c: u8, |
| } |
| |
| enum Foo { |
| Bar = 1, |
| Baz = 2 |
| } |
| |
| #[repr(packed)] |
| struct S3_Foo { |
| a: u8, |
| b: u16, |
| c: Foo |
| } |
| |
| #[repr(packed)] |
| struct S7_Option { |
| a: f32, |
| b: u8, |
| c: u16, |
| d: Option<Box<f64>> |
| } |
| |
| // Placing packed structs in statics should work |
| static TEST_S4: S4 = S4 { a: 1, b: [2, 3, 4] }; |
| static TEST_S5: S5 = S5 { a: 3, b: 67 }; |
| static TEST_S3_Foo: S3_Foo = S3_Foo { a: 1, b: 2, c: Foo::Baz }; |
| |
| |
| pub fn main() { |
| assert_eq!(mem::size_of::<S4>(), 4); |
| assert_eq!(mem::size_of::<S5>(), 5); |
| assert_eq!(mem::size_of::<S13>(), 13); |
| assert_eq!(mem::size_of::<S3_Foo>(), 3 + mem::size_of::<Foo>()); |
| assert_eq!(mem::size_of::<S7_Option>(), 7 + mem::size_of::<Option<Box<f64>>>()); |
| } |