#include <Core/Core.h>

using namespace Upp;

//without this one beeing in namespace upp it doesnt work eaither
//suppose because of friend DeepCopyNew not beeing placed / referenced to template definition
NAMESPACE_UPP

template<class T, class B = EmptyClass>
class Copyable : public B
{
public:
	virtual ~Copyable() {}
	virtual T* Copy() const                    { return PartialCopy(); }
	virtual T* PartialCopy() const             = 0; //{ NEVER(); return NULL; }
};

template<class C, class B = EmptyClass>
class CopyableC : public Copyable<CopyableC<C,B>, B>
{
public:
	virtual const C& GetC() const              = 0;
	virtual C& GetC()                          = 0;
	
	operator const C&() const                  { return GetC(); }
	operator C&()                              { return GetC(); }
};

template<class B, class C, class CB = EmptyClass>
class PolyCopyableC : public B, public PolyDeepCopyNew<CopyableC<C, CB>, CopyableC<C, CB> >
{
public:
	virtual const C& GetC() const              { return *this; }
	virtual C& GetC()                          { return *this; }
};

END_UPP_NAMESPACE

//OWN CLASSES

//this one doesnt help
//NAMESPACE_UPP

//a common base interface, that should be available after copying, (i.e Offer() )
//is meant as an extension interface on very bottom
//should be implemented at very top
class CBase 
{
public:
	virtual void Offer(int a) = 0;
};

//a common base class, which should be accessible via GetC (could be i.e Ctrl)
class Base {};

//a Base version (could be any Ctrl derive, i.e StaticText)
//neither Base nor Derived are to be changed, they are foreign
//thats why so complicated
class Derived : public Base {};

//extension of the whole thing, to make everything cloneable..
class Master : public PolyCopyableC<Derived, Base, CBase>
{
public:
	Master* PartialCopy() const { return new Master(); }
	virtual void Offer(int a) {}
};

//END_UPP_NAMESPACE

//with this one both work, but i'd like to avoid that and to have it automatic in PolyCopyableC
#if 0
NAMESPACE_UPP
template<>
inline CopyableC<Base, CBase>* DeepCopyNew(const CopyableC<Base, CBase>& x) {
	return x.Copy();
}
END_UPP_NAMESPACE
#endif

CONSOLE_APP_MAIN
{
	Array<CopyableC<Base, CBase> > a1, a2;
	a1.Add(new Master());
	a1 <<= a2;	
}