Here's my paper on std::chimeric_ptr :

    http://www.virjacode.com/papers/chimeric_pointer.htm

Also the HTML file is attached to this email.

All of the features described in the paper are tested and working in
the GodBolt links provided (i.e. I have my own patched compiler up on
GodBolt). Feel free to edit the GodBolts and experiment with it.