virtual constructor.cpp

class NLComponent
{
    public:
        virtual NLComponent* clone() const = 0;
};


class TextBlocks : public NLComponent
{
    public:
        virtual TextBlocks* clone() const
        {
            cout<<"constructing TextBlocks"<<endl;
            return new TextBlocks(*this);
        }
};


class Graphics : public NLComponent
{
    public:
        virtual Graphics* clone() const
        {
            cout<<"constructing Graphics"<<endl;
            return new Graphics(*this);
        }
};

int main() 
{
    TextBlocks text;
    Graphics graph;
    vector<NLComponent*> components;
    list<NLComponent*> lsc;
    components.push_back(&text);
    components.push_back(&graph);

    for (vector<NLComponent*>::iterator it = components.begin(); it != components.end(); ++it)
    {
        lsc.push_back((*it)->clone());
    }

    for_each(lsc.begin(), lsc.end(), [&](NLComponent* ptr)
    {
        delete ptr;    
    });

    _getch();
    return 0;
}