What is a C++11 extension [-Wc++11-extensions]

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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 you’re doing has only become legal, official C++ in 2011. Your compiler’s default seems to be the 1998 standard.

Try compiling with -std=c++11 as a command line flag (assuming you’re using GCC or clang), and the warning should go away. If you’re using a different compiler, there should be a flag for that as well (if it’s recent enough to implement C++11).

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