What is a C++11 extension [-Wc++11-extensions]
That’s not an error, it’s a warning. It tells you that you’re only allowed to initialize non-static members of a struct / class starting with the C++11 standard (so called because it was published in 2011). Before that, you weren’t officially allowed to by C++98 (published, you’ve guessed it, in 1998). Long story short, what … Read more