Merge commit '4ebe6417a5fce5f0994fc0c31bebf732be96a07c' as 'boost'

boost/libs/numeric/interval/examples/rational.cpp

@@ -0,0 +1,43 @@
+/* Boost example/rational.cpp
+ * example program of how to use interval< rational<> >
+ *
+ * Copyright 2002-2003 Guillaume Melquiond, Sylvain Pion
+ *
+ * Distributed under 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)
+ */
+
+// it would have been enough to only include:
+//   <boost/numeric/interval.hpp>
+// but it's a bit overkill to include processor intrinsics
+// and transcendental functions, so we do it by ourselves
+
+#include <boost/numeric/interval/interval.hpp>      // base class
+#include <boost/numeric/interval/rounded_arith.hpp> // default arithmetic rounding policy
+#include <boost/numeric/interval/checking.hpp>      // default checking policy
+#include <boost/numeric/interval/arith.hpp>         // += *= -= etc
+#include <boost/numeric/interval/policies.hpp>      // default policy
+
+#include <boost/rational.hpp>
+#include <iostream>
+
+typedef boost::rational<int> Rat;
+typedef boost::numeric::interval<Rat> Interval;
+
+std::ostream& operator<<(std::ostream& os, const Interval& r) {
+  os << "[" << r.lower() << "," << r.upper() << "]";
+  return os;
+}
+
+int main() {
+  Rat p(2, 3), q(3, 4);
+  Interval z(4, 5);
+  Interval a(p, q);
+  a += z;
+  z *= q;
+  a -= p;
+  a /= q;
+  std::cout << z << std::endl;
+  std::cout << a << std::endl;
+}