Warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11? [duplicate]

Answer 1

The compiler probably allows it as an extension, it's really not allowed in the older C++ standards.

Either initialize the object through a constructor initializer list, or enable C++11 using the flags the compiler tells you.

---

Example using a constructor initialize list:

class Moveset
{
public:
    Moveset()
        : slot1{"MOVE 1", rand() % 18, 10*(rand() % 15 + 1), 5 * (rand() % 11 + 10)}
    {
    }
private:
    Move slot1;
};

You seem to be using an IDE of some kind, so I don't know how to add the flags, but usually somewhere in the project settings there is a tab for the compiler and its settings, where you should be able to add flags (if there isn't a checkbox for C++11 already), just add -std=c++11 there.

Answer 2

You asked:

Edit: And what is the difference between a static member initializer and non-static member initializer?

Not much different.
The intializer to initialize a static member is a static member initializer.
The intializer to initialize a non-static member is a non-static member initializer.

class foo
{    
    static int var2 = 20;  // static member initializer
    int var1 = 10;         // non-static member initializer
};