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
137
138
139
140
#[cfg(feature = "alloc")]
use alloc::boxed::Box;
use core::borrow::Borrow;
use core::fmt;
use core::ops::Deref;
#[cfg(feature = "nightly")]
use core::ptr::NonNull;
pub struct UnsafeRef<T: ?Sized> {
#[cfg(feature = "nightly")]
ptr: NonNull<T>,
#[cfg(not(feature = "nightly"))]
ptr: *mut T,
}
#[cfg(feature = "nightly")]
impl<T: ?Sized> UnsafeRef<T> {
#[inline]
pub unsafe fn from_raw(val: *const T) -> UnsafeRef<T> {
UnsafeRef {
ptr: NonNull::new_unchecked(val as *mut _),
}
}
#[inline]
pub fn into_raw(ptr: Self) -> *mut T {
ptr.ptr.as_ptr()
}
}
#[cfg(not(feature = "nightly"))]
impl<T: ?Sized> UnsafeRef<T> {
#[inline]
pub unsafe fn from_raw(val: *const T) -> UnsafeRef<T> {
UnsafeRef { ptr: val as *mut _ }
}
#[inline]
pub fn into_raw(ptr: Self) -> *mut T {
ptr.ptr
}
}
#[cfg(feature = "alloc")]
impl<T: ?Sized> UnsafeRef<T> {
#[inline]
pub fn from_box(val: Box<T>) -> UnsafeRef<T> {
unsafe { UnsafeRef::from_raw(Box::into_raw(val)) }
}
#[inline]
pub unsafe fn into_box(ptr: Self) -> Box<T> {
Box::from_raw(UnsafeRef::into_raw(ptr))
}
}
impl<T: ?Sized> Clone for UnsafeRef<T> {
#[inline]
fn clone(&self) -> UnsafeRef<T> {
UnsafeRef { ptr: self.ptr }
}
}
impl<T: ?Sized> Deref for UnsafeRef<T> {
type Target = T;
#[inline]
fn deref(&self) -> &T {
self.as_ref()
}
}
impl<T: ?Sized> AsRef<T> for UnsafeRef<T> {
#[cfg(feature = "nightly")]
#[inline]
fn as_ref(&self) -> &T {
unsafe { self.ptr.as_ref() }
}
#[cfg(not(feature = "nightly"))]
#[inline]
fn as_ref(&self) -> &T {
unsafe { &*self.ptr }
}
}
impl<T: ?Sized> Borrow<T> for UnsafeRef<T> {
#[inline]
fn borrow(&self) -> &T {
self.as_ref()
}
}
impl<T: fmt::Debug + ?Sized> fmt::Debug for UnsafeRef<T> {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Debug::fmt(self.as_ref(), f)
}
}
unsafe impl<T: ?Sized + Send> Send for UnsafeRef<T> {}
unsafe impl<T: ?Sized + Sync> Sync for UnsafeRef<T> {}