Function sub_ptr

src/fast.rs:35–38

(ptr: *mut T, origin: *mut T)

/// Replacement for `feature = "ptr_sub_ptr"` which isn't yet stable.
#[inline(always)]
fn sub_ptr<T>(ptr: *mut T, origin: *mut T) -> usize {
    // unsafe { ptr.sub_ptr(origin) }
    (ptr as usize - origin as usize) / std::mem::size_of::<T>()
}

impl<T> From<FastVec<T>> for Vec<T> {
    fn from(fast: FastVec<T>) -> Self {