> Hello all,
> small question: there seems no xor operator in c++ but there is also no Boost
> xor functor (like the std::logical_and)?
> Scenario: I have 2 data members used in variant like way: only 1 may be
valid.
> Both valid or both invalid is incorrect.
>
> Can't you use !!A != !!B? (or !!A ^ !!B)

ah quite brilliant! I was thinking about the (a ? !b : b). Still a logical_xor
does also has a documentation value.