// Copyright John Maddock 2007. // Use, modification and distribution are subject to the // Boost Software License, Version 1.0. (See accompanying file // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // Note that this file contains quickbook mark-up as well as code // and comments, don't change any of the special comment mark-ups! double some_value = 2; //[policy_ref_snip3 #include <boost/math/special_functions/gamma.hpp> using namespace boost::math::policies; using namespace boost::math; // Define a policy: typedef policy< promote_double<false> > my_policy; // Call the function: double t1 = tgamma(some_value, my_policy()); // Alternatively we could use make_policy and define everything at the call site: double t2 = tgamma(some_value, make_policy(promote_double<false>())); //] #include <iostream> int main() { std::cout << t1 << " " << t2 << std::endl; }