C2440 error in VisualStudio 2019

[carriann]

Types kp:Input Field/Button/Timer* are not converted into ReturnClass*. What's wrong? I don't understand.

template <class ReturnClass>
static ReturnClass* createObject(kp::ObjectType type)
{
    switch (type)
    {
        case kp::ObjectType::InputField:
            return createInputField();
    case kp::ObjectType::Button:
        return createButton();

    case kp::ObjectType::Timer:
        return createTimer();

    default:
        return nullptr;
}

}

[shizuka]

If the type is not known at the compilation stage, different types cannot be returned. Temples are powerless.

You can do that.

variant<TypeA*, TypeB*, void*> createObject(kp::ObjectType type)