C++ abstract class without pure virtual functions?

Question

I have a base class

class ShapeF
{
public:
    ShapeF();
    virtual ~ShapeF();

    inline void SetPosition(const Vector2& inPosition) { mPosition.Set(i         


        

Answer 1

You could declare, and implement, a pure virtual destructor:

class ShapeF
{
public:
    virtual ~ShapeF() = 0;
    ...
};

ShapeF::~ShapeF() {}

It's a tiny step from what you already have, and will prevent ShapeF from being instantiated directly. The derived classes won't need to change.

Answer 2

Try using a protected constructor

Answer 3

If your compiler is Visual C++ then there is also an "abstract" keyword:

class MyClass abstract
{
    // whatever...
};

Though AFAIK it will not compile on other compilers, it's one of Microsoft custom keywords.