Google chrome must be one of the most used (in terms of CPU time) C++ software in the world right now. That means it's been fuzz tested (by the developers as well as by the users and also the random websites that gives it garbage html and javascript) extensively. I can only think of the Linux kernel that is more widely used, and Linux is not C++.
Since you seem to be very good at c++, can you point to a "significantly higher quality" c++ projects please? I'd like to see what it looks like.
I don't think popular or large correlate with code quality. In fact it's probably the opposite. It uses pretty ancient c++ stuff, which immediately disqualifies it from bring of high quality in regards to the cpp code (and also is the cause for their security bugs)
Since you seem to be very good at c++, can you point to a "significantly higher quality" c++ projects please? I'd like to see what it looks like.