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
|
use core::{marker, mem, ptr};
use core::ops::{Deref, DerefMut};
pub trait Dealloc<T: ?Sized> {
unsafe fn dealloc(p: *mut T);
}
#[repr(transparent)]
pub struct BoxLike<T: ?Sized, D: Dealloc<T>> {
inner: ptr::NonNull<T>,
_phantom: marker::PhantomData<T>,
_dropper: marker::PhantomData<D>,
}
impl<T: ?Sized, D: Dealloc<T>> BoxLike<T, D> {
#[inline]
pub unsafe fn from_raw_unchecked(p: *mut T) -> Self {
BoxLike {
inner: ptr::NonNull::new_unchecked(p),
_phantom: marker::PhantomData,
_dropper: marker::PhantomData,
}
}
#[inline]
pub unsafe fn from_raw(p: *mut T) -> Option<Self> {
if p.is_null() {
None
} else {
Some(Self::from_raw_unchecked(p))
}
}
#[inline]
pub fn into_raw(self) -> *mut T {
let p = self.inner.as_ptr();
mem::forget(self);
p
}
}
impl<T: ?Sized, D: Dealloc<T>> Drop for BoxLike<T, D> {
#[inline]
fn drop(&mut self) {
let p = self.inner.as_ptr();
unsafe {
ptr::drop_in_place(p);
D::dealloc(p);
}
}
}
impl<T: ?Sized, D: Dealloc<T>> Deref for BoxLike<T, D> {
type Target = T;
#[inline]
fn deref(&self) -> &T {
unsafe { self.inner.as_ref() }
}
}
impl<T: ?Sized, D: Dealloc<T>> DerefMut for BoxLike<T, D> {
#[inline]
fn deref_mut(&mut self) -> &mut T {
unsafe { self.inner.as_mut() }
}
}
pub struct DeallocFree;
impl<T: ?Sized> Dealloc<T> for DeallocFree {
#[inline]
unsafe fn dealloc(p: *mut T) {
libc::free(p as _);
}
}
pub type CBox<T> = BoxLike<T, DeallocFree>;
|
