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libs/math/example/policy_ref_snip9.cpp

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+//  Copyright John Maddock 2007.
+//  Copyright Paul A. Bristow 2010
+
+//  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!
+
+#include <iostream>
+using std::cout; using std::endl;
+
+//[policy_ref_snip9
+
+#include <boost/math/special_functions/gamma.hpp>
+using boost::math::tgamma;
+using boost::math::policies::policy;
+using boost::math::policies::digits10;
+
+typedef policy<digits10<5> > my_pol_5; // Define a new, non-default, policy
+// to calculate tgamma to accuracy of approximately 5 decimal digits.
+//]
+
+int main()
+{
+  cout.precision(5); // To only show 5 (hopefully) accurate decimal digits.
+  double t = tgamma(12, my_pol_5()); // Apply the 5 decimal digits accuracy policy to use of tgamma.
+  cout << "tgamma(12, my_pol_5() = " << t << endl;
+}
+
+/*
+
+Output:
+     tgamma(12, my_pol_5() = 3.9917e+007
+*/