What people think about this?

struct S
    std::swap(S&, S&) = delete;

In this example, this would be useful to prevent std::sort for example (even if we add operator< ).

Who’s got the sweetest disposition?
One guess, that’s who?
Who’d never, ever start an argument?
Who never shows a bit of temperament?
Who's never wrong but always right?
Who'd never dream of starting a fight?
Who get stuck with all the bad luck?