Initial commit

libs/math/example/policy_eg_3.cpp

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+//  Copyright John Maddock 2007.
+//  Copyright Paul A. Bristow 2007, 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)
+
+#ifdef _MSC_VER
+# pragma warning (disable : 4305) // 'initializing' : truncation from 'long double' to 'const eval_type'
+# pragma warning (disable : 4244) //  conversion from 'long double' to 'const eval_type'
+#endif
+
+#include <iostream>
+using std::cout; using std::endl;
+
+//[policy_eg_3
+
+#include <boost/math/distributions/binomial.hpp>
+using boost::math::binomial_distribution;
+
+// Begin by defining a policy type, that gives the behaviour we want:
+
+//using namespace boost::math::policies; or explicitly
+using boost::math::policies::policy;
+
+using boost::math::policies::promote_float;
+using boost::math::policies::discrete_quantile;
+using boost::math::policies::integer_round_nearest;
+
+typedef policy<
+   promote_float<false>, // Do not promote to double.
+   discrete_quantile<integer_round_nearest> // Round result to nearest integer.
+> mypolicy;
+//
+// Then define a new distribution that uses it:
+typedef boost::math::binomial_distribution<float, mypolicy> mybinom;
+
+//  And now use it to get the quantile:
+
+int main()
+{
+   cout << "quantile(mybinom(200, 0.25), 0.05) is: " <<
+      quantile(mybinom(200, 0.25), 0.05) << endl;
+}
+
+//]
+
+/*
+
+Output:
+
+  quantile(mybinom(200, 0.25), 0.05) is: 40
+
+*/
+