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virtcons.cc

#include <iostream>
#include <vector>
#include <typeinfo>
using namespace std;

class Clonable
{
    public:
        class Base
        {
            public:
                virtual ~Base()
                {}
                virtual Base *clone() const = 0;
        };

    private:
        Base *d_bp;

    public:
        Clonable()
        :
            d_bp(0)
        {}
        ~Clonable()
        {
            delete d_bp;
        }
        Clonable(Clonable const &other)
        {
            copy(other);
        }
        Clonable &operator=(Clonable const &other)
        {
            if (this != &other)
            {
                delete d_bp;
                copy(other);
            }
            return *this;
        }

        // New for virtual constructions:
        Clonable(Base const &bp)
        {
            d_bp = bp.clone();      // allows initialization from
        }                           // Base and derived objects
        Base &get() const
        {
            return *d_bp;
        }

    private:
        void copy(Clonable const &other)
        {
            if ((d_bp = other.d_bp))
                d_bp = d_bp->clone();
        }
};


class Derived1: public Clonable::Base
{
    public:
        Derived1()
        {}
        Derived1(Derived1 const &other)
        {}
        ~Derived1()
        {}
        virtual Clonable::Base *clone() const
        {
            return new Derived1(*this);
        }
};

int main()
{
    vector<Clonable> bv;
    {
        Derived1 d1;

        bv.push_back(d1);
    }
    cout << "==\n";
    cout << typeid(bv[0].get()).name() << endl;
    cout << "==\n";

    vector<Clonable> v2(bv);
    cout << typeid(v2[0].get()).name() << endl;
    cout << "==\n";

}

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