[libc-commits] [libc] [libc] Add front() and erase() to FixedVector (PR #213866)

[Jeff Bailey via libc-commits]

================

----------------
kaladron wrote:

This contains UB when the array is full.  Because end() is one past the last element, when the item is full, this points to uninitialised memory.  The dereference happens before the address-of, and this will trigger UBSan checks.

I think:

```suggestion
    return reverse_iterator{store.data() + item_count};
```

Should work here (but I haven't tested it locally)

https://github.com/llvm/llvm-project/pull/213866