1 // Copyright 2019 The Fuchsia Authors 2 // 3 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0 4 // <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0>, or the MIT 5 // license <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option. 6 // This file may not be copied, modified, or distributed except according to 7 // those terms. 8 9 // See comment in `include.rs` for why we disable the prelude. 10 #![no_implicit_prelude] 11 #![allow(warnings)] 12 13 include!("include.rs"); 14 15 // A union is `imp::IntoBytes` if: 16 // - all fields are `imp::IntoBytes` 17 // - `repr(C)` or `repr(transparent)` and 18 // - no padding (size of union equals size of each field type) 19 // - `repr(packed)` 20 21 #[derive(imp::IntoBytes, Clone, Copy)] 22 #[repr(C)] 23 union CZst { 24 a: (), 25 } 26 27 util_assert_impl_all!(CZst: imp::IntoBytes); 28 29 #[derive(imp::IntoBytes)] 30 #[repr(C)] 31 union C { 32 a: u8, 33 b: u8, 34 } 35 36 util_assert_impl_all!(C: imp::IntoBytes); 37 38 // Transparent unions are unstable; see issue #60405 39 // <https://github.com/rust-lang/rust/issues/60405> for more information. 40 41 // #[derive(imp::IntoBytes)] 42 // #[repr(transparent)] 43 // union Transparent { 44 // a: u8, 45 // b: CZst, 46 // } 47 48 // is_as_bytes!(Transparent); 49 50 #[derive(imp::IntoBytes)] 51 #[repr(C, packed)] 52 union CZstPacked { 53 a: (), 54 } 55 56 util_assert_impl_all!(CZstPacked: imp::IntoBytes); 57 58 #[derive(imp::IntoBytes)] 59 #[repr(C, packed)] 60 union CPacked { 61 a: u8, 62 b: i8, 63 } 64 65 util_assert_impl_all!(CPacked: imp::IntoBytes); 66 67 #[derive(imp::IntoBytes)] 68 #[repr(C, packed)] 69 union CMultibytePacked { 70 a: i32, 71 b: u32, 72 c: f32, 73 } 74 75 util_assert_impl_all!(CMultibytePacked: imp::IntoBytes); 76