May I ask what is not memory safe about C++ in this situation? I am talking C++11, not the widespread C++98 stuff we find everywhere. Or why not use local vari

May I ask what is not memory safe about C++ in this situation? I am talking C++11, not the widespread C++98 stuff we find everywhere. Or why not use local variables that are guaranteed to be cleaned up? I suspect Apple would have an alternative to write this in Swift, but that would probably have speed implications (I am guessing).