#![no_std]
use core::marker::PhantomData;
use core::ops::*;
pub unsafe trait DropPtr {
unsafe fn drop_ptr(*mut Self);
}
pub struct Box<'a, A: ?Sized + DropPtr>(*mut A, PhantomData<&'a mut ()>);
impl<'a, A: ?Sized + DropPtr> Box<'a, A> {
#[inline]
pub unsafe fn new(ptr: *mut A) -> Option<Self> {
if 0 == ptr as *mut () as usize { None } else { Some(Box(ptr, PhantomData)) }
}
#[inline]
pub unsafe fn new_unchecked(ptr: *mut A) -> Self { Box(ptr, PhantomData) }
}
impl<'a, A: ?Sized + DropPtr> Drop for Box<'a, A> {
#[inline]
fn drop(&mut self) { unsafe { A::drop_ptr(self.0) } }
}
impl<'a, A: ?Sized + DropPtr> Deref for Box<'a, A> {
type Target = A;
#[inline]
fn deref(&self) -> &A { unsafe { &*self.0 } }
}
impl<'a, A: ?Sized + DropPtr> DerefMut for Box<'a, A> {
#[inline]
fn deref_mut(&mut self) -> &mut A { unsafe { &mut *self.0 } }
}