Hi

This this != _STD addressof(_Right) seems redundant

I can't say I understand what are you trying to enable if away, tbh though - but this seems like a less specialized version of the previous assignment.

Here is libc++ - no check
https://github.com/llvm/llvm-project/blob/93a2feccbc909230b6a091f5836b92739bd12941/libcxx/include/__memory/unique_ptr.h#L231

Can you maybe delete it?