Copy constructor: deep copying an abstract class

Question

Suppose I have the following (simplified case):

class Color;

class IColor
{
public: 
    virtual Color getValue(const float u, const float v) const = 0;
};

class Color : public IColor
{
public:
    float r,g,b;
    Color(float ar, float ag, float ab) : r(ar), g(ag), b(ab) {}
    Color getValue(const float u, const float v) const 
    { 
        return Color(r, g, b)
    }
}

class Material
{
private:
    IColor* _color;
public:
    Material();
    Material(const Material& m);
}

Now, is there any way for me to do a deep copy of the abstract IColor in the copy constructor of Material? That is, I want the values of whatever m._color might be (a Color, a Texture) to be copied, not just the pointer to the IColor.

Answer 1

Take a look at the virtual constructor idiom