boost::algorithm::operator! — predicate negation operator
// In header: <boost/algorithm/string/classification.hpp> template<typename PredT> ( Pred);
Construct the class_not predicate. This predicate represents a negation. class_or holds if of the predicates return false.
class_not
class_or
Parameters:
Pred
The predicate to be negated
Returns:
An instance of the class_not predicate