I watched a talk from Bjarne Stroustrup at CppCon about safety and it was pretty second hand embarrassing watching him try to pretend C++ has always been safe and safety mattered all along to them before Rust came along.
Well, there has been a long campaign against manual memory management - well before Rust was a thing. And along with that, a push for less use of raw pointers, less index loops etc. - all measures which, when adopted, reduce memory safety hazards significantly. Following the Core Guideliness also helps, as does using span's. Compiler warnings has improved, as has static analysis, also in a long process preceding Rust.
Of course, this is not completely guaranteed safety - but safety has certainly mattered.
Yes, this what Stroustrup said and it makes me laugh. IIRC he phrased with a more of a 'we had safety before Rust' attitude. It also misses the point, safety shouldn't be opt-in or require memorising a rulebook. If safety is that easy in C++ why is everyone still sticking their hand in the shredder?
You're "moving the goal posts" of this thread. Safety has mattered - in C++ and in other languages as well, e.g. with MISRA C.
As for the Core Guidelines - most of them are not about safety; and - they are not to be memorized, but a resource to consult when relevant, and something to base static analysis on.
