Can I use `abstract` keyword in C++ class

Question

Can we write abstract keyword in C++ class?

Answer 1

actually keyword abstract exists in C++ (VS2010 at least) and I found it can be used to declare a class/struct as non-instantiated.

struct X abstract {
    static int a;
    static void foX(){};
};
int X::a = 0;
struct Y abstract : X { // something static
};
struct Z : X { // regular class
};
int main() {
    X::foX();
    Z Zobj;
    X Xobj;    // error C3622
}

MSDN: https://msdn.microsoft.com/en-us/library/b0z6b513%28v=vs.110%29.aspx