[Bug libstdc++/122506] Initialization of std::vector reads uninitialized memory (UB)

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122506

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Nuno Lopes from comment #0)
> If the access goes through the operator[], it loads uninitialized memory
> first, and then masks it.

Which access?

Can you please provide a complete example that demonstrates the problem.