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array.rs
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array.rs
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/// Trait for fixed size arrays.
pub
unsafe
trait
Array
{
/// The array's element type
type
Item
;
#
[
doc
(
hidden
)
]
/// The smallest index type that indexes the array.
type
Index
:
Index
;
#
[
doc
(
hidden
)
]
fn
as_ptr
(
&
self
)
->
*
const
Self
::
Item
;
#
[
doc
(
hidden
)
]
fn
as_mut_ptr
(
&
mut
self
)
->
*
mut
Self
::
Item
;
#
[
doc
(
hidden
)
]
fn
capacity
(
)
->
usize
;
}
pub
trait
Index
:
PartialEq
+
Copy
{
fn
to_usize
(
self
)
->
usize
;
fn
from
(
usize
)
->
Self
;
}
use
std
::
slice
::
{
from_raw_parts
}
;
pub
trait
ArrayExt
:
Array
{
#
[
inline
(
always
)
]
fn
as_slice
(
&
self
)
->
&
[
Self
::
Item
]
{
unsafe
{
from_raw_parts
(
self
.
as_ptr
(
)
,
Self
::
capacity
(
)
)
}
}
}
impl
<
A
>
ArrayExt
for
A
where
A
:
Array
{
}
#
[
cfg
(
feature =
"use_generic_array"
)
]
unsafe
impl
<
T
,
U
>
Array
for
::
generic_array
::
GenericArray
<
T
,
U
>
where
U
:
::
generic_array
::
ArrayLength
<
T
>
{
type
Item
=
T
;
type
Index
=
usize
;
fn
as_ptr
(
&
self
)
->
*
const
Self
::
Item
{
(
*
*
self
)
.
as_ptr
(
)
}
fn
as_mut_ptr
(
&
mut
self
)
->
*
mut
Self
::
Item
{
(
*
*
self
)
.
as_mut_ptr
(
)
}
fn
capacity
(
)
->
usize
{
U
::
to_usize
(
)
}
}
impl
Index
for
u8
{
#
[
inline
(
always
)
]
fn
to_usize
(
self
)
->
usize
{
self
as
usize
}
#
[
inline
(
always
)
]
fn
from
(
ix
:
usize
)
->
Self
{
ix
as
u8
}
}
impl
Index
for
u16
{
#
[
inline
(
always
)
]
fn
to_usize
(
self
)
->
usize
{
self
as
usize
}
#
[
inline
(
always
)
]
fn
from
(
ix
:
usize
)
->
Self
{
ix
as
u16
}
}
impl
Index
for
u32
{
#
[
inline
(
always
)
]
fn
to_usize
(
self
)
->
usize
{
self
as
usize
}
#
[
inline
(
always
)
]
fn
from
(
ix
:
usize
)
->
Self
{
ix
as
u32
}
}
impl
Index
for
usize
{
#
[
inline
(
always
)
]
fn
to_usize
(
self
)
->
usize
{
self
}
#
[
inline
(
always
)
]
fn
from
(
ix
:
usize
)
->
Self
{
ix
}
}
macro_rules!
fix_array_impl
{
(
$index_type
:
ty
,
$len
:
expr
)
=>
(
unsafe
impl
<
T
>
Array
for
[
T
;
$len
]
{
type
Item
=
T
;
type
Index
= $index_type
;
#
[
inline
(
always
)
]
fn
as_ptr
(
&
self
)
->
*
const
T
{
self
as
*
const
_
as
*
const
_
}
#
[
inline
(
always
)
]
fn
as_mut_ptr
(
&
mut
self
)
->
*
mut
T
{
self
as
*
mut
_
as
*
mut
_
}
#
[
inline
(
always
)
]
fn
capacity
(
)
->
usize
{
$len
}
}
)
}
macro_rules!
fix_array_impl_recursive
{
(
$index_type
:
ty
,
)
=>
(
)
;
(
$index_type
:
ty
,
$len
:
expr
,
$
(
$more
:
expr
,
)
*
)
=>
(
fix_array_impl!
(
$index_type
,
$len
)
;
fix_array_impl_recursive!
(
$index_type
,
$
(
$more
,
)
*
)
;
)
;
}
fix_array_impl_recursive
!
(
u8
,
0
,
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
,
40
,
48
,
56
,
64
,
72
,
96
,
128
,
160
,
192
,
224
,
)
;
fix_array_impl_recursive
!
(
u16
,
256
,
384
,
512
,
768
,
1024
,
2048
,
4096
,
8192
,
16384
,
32768
,
)
;
// This array size doesn't exist on 16-bit
#
[
cfg
(
any
(
target_pointer_width=
"32"
,
target_pointer_width=
"64"
)
)
]
fix_array_impl_recursive
!
(
u32
,
1
<<
16
,
)
;
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