/* Boost interval/detail/c99sub_rounding_control.hpp file

 *

 * Copyright 2000 Jens Maurer

 * Copyright 2002 Hervé Brönnimann, 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)

 */



#ifndef BOOST_NUMERIC_INTERVAL_DETAIL_C99SUB_ROUNDING_CONTROL_HPP

#define BOOST_NUMERIC_INTERVAL_DETAIL_C99SUB_ROUNDING_CONTROL_HPP



#include <fenv.h>      // ISO C 99 rounding mode control



namespace boost {

namespace numeric {

namespace interval_lib {

namespace detail {



extern "C" { double rint(double); }



struct c99_rounding

{

  typedef int rounding_mode;



  static void set_rounding_mode(const rounding_mode mode) { fesetround(mode); }

  static void get_rounding_mode(rounding_mode &mode) { mode = fegetround(); }

  static void downward()    { set_rounding_mode(FE_DOWNWARD);   }

  static void upward()      { set_rounding_mode(FE_UPWARD);     }

  static void to_nearest()  { set_rounding_mode(FE_TONEAREST);  }

  static void toward_zero() { set_rounding_mode(FE_TOWARDZERO); }



  template<class T>

  static T to_int(const T& r) { return rint(r); }

};



} // namespace detail

} // namespace interval_lib

} // namespace numeric

} // namespace boost



#endif // BOOST_NUMERIC_INTERVAL_DETAIL_C99SUB_ROUBDING_CONTROL_HPP

