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
use std::ffi::c_void;
use std::ptr::NonNull;
use std::sync::Arc;
pub trait OpaqueContext {
fn into_raw(self) -> *mut c_void;
/// Drops the raw context pointer and deallocates the underlying resources.
///
/// The context must carry any allocation metadata needed to destroy itself.
/// DLPack tensor fields are public mutable ABI state and are intentionally
/// not provided to this method.
///
/// # Safety
///
/// The caller must ensure that `raw` was obtained from `into_raw` and has
/// not been dropped yet. Implementations must not unwind.
unsafe fn drop_raw(raw: *mut c_void);
}
impl<T: Sized> OpaqueContext for Box<T> {
fn into_raw(self) -> *mut c_void {
Box::into_raw(self) as *mut _
}
unsafe fn drop_raw(raw: *mut c_void) {
if !raw.is_null() {
unsafe {
let _ = Box::from_raw(raw as *mut T);
}
}
}
}
impl<T: Sized> OpaqueContext for Arc<T> {
fn into_raw(self) -> *mut c_void {
Arc::into_raw(self) as *mut c_void
}
unsafe fn drop_raw(raw: *mut c_void) {
if !raw.is_null() {
unsafe {
let _ = Arc::from_raw(raw as *const T);
}
}
}
}
impl<T: Sized> OpaqueContext for NonNull<T> {
fn into_raw(self) -> *mut c_void {
self.as_ptr() as *mut c_void
}
unsafe fn drop_raw(_raw: *mut c_void) {
// 🔒 既然用户传的是裸指针，生命周期由用户自己用其他暗号控制，
// 基础库在 deleter 触发时什么都不做（No-op），绝对不越权去 free 它的堆内存
}
}