Re: C++ language: Cloneable classes

> That's an ABC, not a concept.

I agree, concept is an incorrect word for it.

> And I don't see why you would want to
> require a class to be default-constructible for it to be clonable.

I don't understand where do I require default-constructible?

> Plus, it forces usage of new, so it's definitely not a general-purpose
> solution.

The whole point of cloning is to make it polymorphic, i.e.:
class A {...};
class B : public A {...};
class C : public A {...};
And now if we need SomeContainer<A> to be able to store objects of
type B or C, and be able to make copies, without knowing their actual
type, THAT is where cloning comes in handy. And the best way I can
find/think of is what I described in my first post. Can You perhaps
see a way to avoid usage of new?

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