I have std::invoke and std::apply working now for chimeric pointer but I'm
away on holidays at the moment and don't have access to a PC, so I'll
update my compiler when I'm home in January.

I played with a few possible implementations of chimeric_ptr, and most
likely I will go with the following:

struct chimeric_ptr {
    void *address_of_original_object;
    void *(*addr_of_function)(type_info&);
};

I was worried that this would mean that chimeric pointer cannot be atomic,
but then I discovered the x86_64 CPU instruction CMPXCHG16B, which can do
lockfree atomic operations on 128-Bit integers, so then I'll provide a
specialisation of:

    std::atomic< std::chimeric_ptr >

In early January I'll have this done.