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