> There is just so much unmodern and unsafe c++ out there. Mixing modern c++ into older codebases leaves uncertain assumptions everywhere and sometimes awkward

> There is just so much unmodern and unsafe c++ out there. Mixing modern c++ into older codebases leaves uncertain assumptions everywhere and sometimes awkward interop with the old c++ Your complaint doesn’t look valid to me: the feature in the article is implemented with compiler macros that work with old and new code without changes. See https://libcxx.llvm.org/Hardening.html#notes-for-users https://libcxx.llvm.org/Hardening.html#notes-for-users