Question

I was used something like this in C# or other languages.

// C#, but I can't remember correctly. Just assume like a pseudo code.
class A
{
    public int b;
    public A(int newB)
    {
        b = newB
    }
    public static const A a1 = A(1);
    public static const A a2 = A(2);
    public static const A a3 = A(3);
}

Is there equivalent of this in C++? Or any recommended way to do this? I do this for just to organize a1, a2, a3 within its class name.

Answer 1

Is there equivalent of this in C++?

The following C++ code is equivalent to your C# code:

class A
{
    public:
    int b;
    A(int newB) : b(newB)
    {
    }

    //declaration
    static const A a1;
    static const A a2;
    static const A a3;
};

//definition - necessary!
const A A::a1 = A(1);
const A A::a2 = A(2);
const A A::a3 = A(3);