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

问题

I need some help understanding where this error is occurring:

warning: in-class initialization of non-static data member is a C++11 extension [-Wc++11-extensions]

This is the section of the code that it is coming from:

typedef struct Hand {
    bool straight = false;
    bool flush = false;
    bool four = false;
    bool three = false;
    int pairs = 0;
    } Hand;

回答1:

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).

来源：https://stackoverflow.com/questions/45291142/what-is-a-c11-extension-wc11-extensions