drop_ptr/
lib.rs

1#![no_std]
2
3use core::marker::PhantomData;
4use core::ops::*;
5
6pub unsafe trait DropPtr {
7    unsafe fn drop_ptr(*mut Self);
8}
9
10pub struct Box<'a, A: ?Sized + DropPtr>(*mut A, PhantomData<&'a mut ()>);
11
12impl<'a, A: ?Sized + DropPtr> Box<'a, A> {
13    #[inline]
14    pub unsafe fn new(ptr: *mut A) -> Option<Self> {
15        if 0 == ptr as *mut () as usize { None } else { Some(Box(ptr, PhantomData)) }
16    }
17
18    #[inline]
19    pub unsafe fn new_unchecked(ptr: *mut A) -> Self { Box(ptr, PhantomData) }
20}
21
22impl<'a, A: ?Sized + DropPtr> Drop for Box<'a, A> {
23    #[inline]
24    fn drop(&mut self) { unsafe { A::drop_ptr(self.0) } }
25}
26
27impl<'a, A: ?Sized + DropPtr> Deref for Box<'a, A> {
28    type Target = A;
29
30    #[inline]
31    fn deref(&self) -> &A { unsafe { &*self.0 } }
32}
33
34impl<'a, A: ?Sized + DropPtr> DerefMut for Box<'a, A> {
35    #[inline]
36    fn deref_mut(&mut self) -> &mut A { unsafe { &mut *self.0 } }
37}
drop_ptr/lib.rs

drop_ptr/
lib.rs
