pub fn copy_slice<T,S,D>(mut dst: D, src: S) -> usize
where S: AsRef<[T]>,
      D: AsMut<[T]>,
T: Clone
{
    let mut sz=0;
    for (d,s) in dst.as_mut().iter_mut().zip(src.as_ref().iter())
    {
	*d = s.clone();
	sz+=1;
    }
    sz
}

#[inline]
pub fn reinterpret<T>(src: &T) -> &[u8]
    where T: ?Sized
{
    unsafe {
	std::slice::from_raw_parts(src as *const T as *const u8, std::mem::size_of_val(src))
    }
}

pub fn reinterpret_back<T>(src: &[u8]) -> &T
    where T: ?Sized + Copy
{
    unsafe {
	&*(&src[0] as *const u8 as *const T)
    }
}