std::make_shared 接口？

Question

I have a Component class who inherits from IComponent. This function link a component with antoher.

    void Component::link(IComponent &other)
    {
        components->setRef(std::make_shared<IComponent>(other));
    }

When I compile my program I have this error:

error: invalid new-expression of abstract class type ‘IComponent’

How can I fix this?

PS: I understand that I can't instantiate an Interface because she's contain pure virtual function, but I don't know how to avoid this problem

Answer 1

It's quite unclear what you trying to do here. "setRef()" sounds like its argument is a reference, if so you don't need to do anything with (smart) pointers. You should at least show the prototype of that method.

As noted above, if you want to "make a copy" of "other" you should do it by "cloning" interface, eg create virtual "IComponent* IComponent::clone()" method and implement it properly in Component. Also if it's guaranteed "other" is a reference to Component that you can cast and copy-construct the new instance (but that's unlikely what your teacher wants you too do).