I was hoping it'd be about an ISO standard library implementation. Mostly because the GNU and Clang ones are difficult to read.

But unique_ptr definitely does not satisfy TFA's `concept WellBehaved`...?

I mean, the idea of a "concept WellBehaved" is pretty intriguing (albeit completely unattested in practice AFAIK), but TFA should have spent a minute coming up with a concept definition that actually works before posting.