generic_interface14.cpp

template<class Interface>
struct GenericInterface
{
    std::string query_interface() const
    {
        return fit::conditional(
            [](auto&& x) FIT_RETURNS(x.interface()),
            [](auto&& x) FIT_RETURNS(x.get_my_interface()),
            [](auto&& x) FIT_RETURNS(x.myInterface())
        )(i);
    }
    Interface i;
};