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use std::mem;
use std::ptr::NonNull;

pub use eraserhead_derive::*;

pub unsafe trait Erase {
    type Erased: ?Sized;
    fn erase(&self) -> NonNull<Self::Erased>;
    unsafe fn unerase<'a>(erased: NonNull<Self::Erased>) -> &'a Self;
}

unsafe impl<T: Erase> Erase for [T] where T::Erased: Sized {
    type Erased = [T::Erased];

    fn erase(&self) -> NonNull<Self::Erased> {
        unsafe { mem::transmute(self) }
    }

    unsafe fn unerase<'a>(erased: NonNull<Self::Erased>) -> &'a Self {
        mem::transmute(erased)
    }
}