dstify 0.2.1

safe construction of custom dynamically-sized types (DSTs)
Documentation 
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use super::{DropGuard, Sealed, SmartPointer};
use alloc::{alloc::Layout, boxed::Box, sync::Arc};

impl<T: ?Sized> Sealed for alloc::sync::Arc<T> {}

impl<T: ?Sized> SmartPointer<T> for Arc<T> {
    type Guard = DropGuard;

    unsafe fn alloc(layout: Layout) -> (*mut u8, Self::Guard) {
        unsafe { Box::<T>::alloc(layout) }
    }

    unsafe fn cast(base: *mut T) -> Self {
        unsafe { Box::from_raw(base) }.into()
    }
}