Florian wrote:
Hmm.. << >> would be look ok for me, because multivalues don´t provide arithmetic operations and they can't be misunderstood in this context. But at all, I don´t like this misuse of operator overloads, ...
I feel the same; none of the proposals are good, and user-defined predicates are probably rare enough that the below compare() idea is fine. Darren
because it can lead into complex and confusing compiler error messages. My appraoch is still to provide a simple predicate-function like compare( all_off( a ), pred(), any_of( b ) ). This has also the advantage, that there are no ambigous problems with operator overloads of lambda expressions, which occour if you write something like all_of( a ) << lambda::_1 > lambda::_2 >> any_of( b ).. Where also parentheses don't help.