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use crate::boxed::Box; use crate::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 }