Should Helper/Utility Classes be abstract?

Question

I commonly find myself extracting common behavior out of classes into helper/utility classes that contain nothing but a set of static methods. I\'ve often wondered if I sho

Answer 1

As others stated, make a private parameter-less constructor. No-one can create an instance of it, apart from the class itself.

As others have shown how it is done with other languages, here comes how you do it in the next C++ version, how to make a class non-instantiable:

struct Utility { 
    static void doSomething() { /* ... */ } 
    Utility() = delete; 
};