Chris@16: /* Boost interval/detail/c99sub_rounding_control.hpp file
Chris@16:  *
Chris@16:  * Copyright 2000 Jens Maurer
Chris@16:  * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion
Chris@16:  *
Chris@16:  * Distributed under the Boost Software License, Version 1.0.
Chris@16:  * (See accompanying file LICENSE_1_0.txt or
Chris@16:  * copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_C99SUB_ROUNDING_CONTROL_HPP
Chris@16: #define BOOST_NUMERIC_INTERVAL_DETAIL_C99SUB_ROUNDING_CONTROL_HPP
Chris@16: 
Chris@16: #include <boost/detail/fenv.hpp>      // ISO C 99 rounding mode control
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace numeric {
Chris@16: namespace interval_lib {
Chris@16: namespace detail {
Chris@16: 
Chris@16: extern "C" { double rint(double); }
Chris@16: 
Chris@16: struct c99_rounding_control
Chris@16: {
Chris@16:   typedef int rounding_mode;
Chris@16: 
Chris@16:   static void set_rounding_mode(rounding_mode mode)  { fesetround(mode); }
Chris@16:   static void get_rounding_mode(rounding_mode &mode) { mode = fegetround(); }
Chris@16:   static void downward()    { set_rounding_mode(FE_DOWNWARD);   }
Chris@16:   static void upward()      { set_rounding_mode(FE_UPWARD);     }
Chris@16:   static void to_nearest()  { set_rounding_mode(FE_TONEAREST);  }
Chris@16:   static void toward_zero() { set_rounding_mode(FE_TOWARDZERO); }
Chris@16: 
Chris@16:   template<class T>
Chris@16:   static T to_int(const T& r) { return rint(r); }
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: } // namespace interval_lib
Chris@16: } // namespace numeric
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // BOOST_NUMERIC_INTERVAL_DETAIL_C99SUB_ROUBDING_CONTROL_HPP