Method operator()

inst/include/Rcpp/algorithm.h:195–201

    struct sqrt {
        template< typename T >
        inline double operator()(T val) {
            if (!Vector< rtype< T >::RTYPE >::is_na(val)) {
                return std::sqrt(val);
            }

            return rtype< double >::NA();
        }
    };
} // namespace helpers