| /* 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 |