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
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
#[cfg(arch = "x86_64")]
pub use self::Aligned128 as CacheAligned;
#[cfg(not(arch = "x86_64"))]
pub use self::Aligned64 as CacheAligned;
use core::borrow::{Borrow, BorrowMut};
use core::ops::{Deref, DerefMut};
macro_rules! impl_align {
($(struct align($align:expr) $wrapper:ident; $comment:expr)*) => {
$(
#[doc = $comment]
#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialEq, PartialOrd)]
#[repr(align($align))]
pub struct $wrapper<T>(pub T);
impl<T> $wrapper<T> {
#[inline]
pub fn get(aligned: &Self) -> &T {
&aligned.0
}
}
impl<T> Deref for $wrapper<T> {
type Target = T;
#[inline]
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<T> DerefMut for $wrapper<T> {
#[inline]
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl<T> AsRef<T> for $wrapper<T> {
#[inline]
fn as_ref(&self) -> &T {
&self.0
}
}
impl<T> AsMut<T> for $wrapper<T> {
#[inline]
fn as_mut(&mut self) -> &mut T {
&mut self.0
}
}
impl<T> Borrow<T> for $wrapper<T> {
#[inline]
fn borrow(&self) -> &T {
&self.0
}
}
impl<T> BorrowMut<T> for $wrapper<T> {
#[inline]
fn borrow_mut(&mut self) -> &mut T {
&mut self.0
}
}
)*
};
}
impl_align! {
struct align(1) Aligned1; "A thin wrapper type with an alignment of at least 1 bytes."
struct align(2) Aligned2; "A thin wrapper type with an alignment of at least 2 bytes."
struct align(4) Aligned4; "A thin wrapper type with an alignment of at least 4 bytes."
struct align(8) Aligned8; "A thin wrapper type with an alignment of at least 8 bytes."
struct align(16) Aligned16; "A thin wrapper type with an alignment of at least 16 bytes."
struct align(32) Aligned32; "A thin wrapper type with an alignment of at least 32 bytes."
struct align(64) Aligned64; "A thin wrapper type with an alignment of at least 64 bytes."
struct align(128) Aligned128; "A thin wrapper type with an alignment of at least 128 bytes."
struct align(256) Aligned256; "A thin wrapper type with an alignment of at least 256 bytes."
struct align(512) Aligned512; "A thin wrapper type with an alignment of at least 512 bytes."
struct align(1024) Aligned1024; "A thin wrapper type with an alignment of at least 1024 bytes."
struct align(2048) Aligned2048; "A thin wrapper type with an alignment of at least 2048 bytes."
struct align(4096) Aligned4096; "A thin wrapper type with an alignment of at least 4096 bytes."
struct align(0x2000) Aligned8k; "A thin wrapper type with an alignment of at least 8kB."
struct align(0x4000) Aligned16k; "A thin wrapper type with an alignment of at least 16 kB."
struct align(0x8000) Aligned32k; "A thin wrapper type with an alignment of at least 32 kB."
struct align(0x10000) Aligned64k; "A thin wrapper type with an alignment of at least 64 kB."
struct align(0x20000) Aligned128k; "A thin wrapper type with an alignment of at least 128 kB."
struct align(0x40000) Aligned256k; "A thin wrapper type with an alignment of at least 256 kB."
struct align(0x80000) Aligned512k; "A thin wrapper type with an alignment of at least 512 kB."
struct align(0x100000) Aligned1M; "A thin wrapper type with an alignment of at least 1 MB."
struct align(0x200000) Aligned2M; "A thin wrapper type with an alignment of at least 2 MB."
struct align(0x400000) Aligned4M; "A thin wrapper type with an alignment of at least 4 MB."
struct align(0x800000) Aligned8M; "A thin wrapper type with an alignment of at least 8 MB."
struct align(0x1000000) Aligned16M; "A thin wrapper type with an alignment of at least 16 MB."
struct align(0x2000000) Aligned32M; "A thin wrapper type with an alignment of at least 32 MB."
struct align(0x4000000) Aligned64M; "A thin wrapper type with an alignment of at least 64 MB."
struct align(0x8000000) Aligned128M; "A thin wrapper type with an alignment of at least 128 MB."
struct align(0x10000000) Aligned256M; "A thin wrapper type with an alignment of at least 256 MB."
struct align(0x10000000) Aligned512M; "A thin wrapper type with an alignment of at least 512 MB."
}
#[cfg(test)]
mod tests {
use std::mem;
use super::*;
#[test]
fn alignments() {
assert_eq!(mem::align_of::<Aligned8<u8>>(), 8);
assert_eq!(mem::align_of::<Aligned16<u8>>(), 16);
assert_eq!(mem::align_of::<Aligned32<u8>>(), 32);
assert_eq!(mem::align_of::<Aligned64<u8>>(), 64);
assert_eq!(mem::align_of::<Aligned128<u8>>(), 128);
assert_eq!(mem::align_of::<Aligned256<u8>>(), 256);
assert_eq!(mem::align_of::<Aligned512<u8>>(), 512);
assert_eq!(mem::align_of::<Aligned1024<u8>>(), 1024);
assert_eq!(mem::align_of::<Aligned2048<u8>>(), 2048);
assert_eq!(mem::align_of::<Aligned4096<u8>>(), 4096);
}
#[test]
fn construct_and_deref() {
let value = Aligned8(255u8);
assert_eq!(*value, 255);
let value = CacheAligned(1u8);
assert_eq!(*value, 1);
}
}