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use boxed::Box;
use ptr;
pub type Key = usize;
struct Allocated {
value: *mut u8,
dtor: Option<unsafe extern fn(*mut u8)>,
}
#[inline]
pub unsafe fn create(dtor: Option<unsafe extern fn(*mut u8)>) -> Key {
Box::into_raw(Box::new(Allocated {
value: ptr::null_mut(),
dtor,
})) as usize
}
#[inline]
pub unsafe fn set(key: Key, value: *mut u8) {
(*(key as *mut Allocated)).value = value;
}
#[inline]
pub unsafe fn get(key: Key) -> *mut u8 {
(*(key as *mut Allocated)).value
}
#[inline]
pub unsafe fn destroy(key: Key) {
let key = Box::from_raw(key as *mut Allocated);
if let Some(f) = key.dtor {
f(key.value);
}
}
#[inline]
pub fn requires_synchronized_create() -> bool {
false
}