Method operator()

lib/vfvalue.h:137–140

            };
            template<class Compare, class T>
            void operator()(bool& result, const Value& rhs, Compare compare, T x) const {
                visitValue(rhs,
                           std::bind(innerVisitor{}, std::ref(result), std::move(compare), x, std::placeholders::_1));
            }
        };

        template<class Compare>