Dear all, I am defining a "scalar" type for a project, and this scalar I'd like to be an interval. Among the operations, already provided by boost interval, I need pow(interval, interval). Since there is no pow() function, but log() and exp() are defined, I mistakenly defined power as the obvious: typedef boost::numeric::interval<double> scalar; scalar p(1.0, 1.0), q(4, 100); log << "^ " << boost::numeric::exp(p * boost::numeric::log(q)) << std::endl; Unfortunately, it won't work, and it gives me this error: /usr/local/include/boost/numeric/interval/transc.hpp:47:42: No member named 'log_down' in 'boost::numeric::interval_lib::rounded_math<double>' /usr/local/include/boost/numeric/interval/transc.hpp:34:16: No member named 'exp_down' in 'boost::numeric::interval_lib::rounded_math<double>' Is there any "correct" pow() function I can implement? Is something wrong with the definition of scalar? Thank you!