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1 | /* Boost interval/detail/c99sub_rounding_control.hpp file |
2 | * | |
3 | * Copyright 2000 Jens Maurer | |
b32b8144 | 4 | * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion |
7c673cae FG |
5 | * |
6 | * Distributed under the Boost Software License, Version 1.0. | |
7 | * (See accompanying file LICENSE_1_0.txt or | |
8 | * copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | */ | |
10 | ||
11 | #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_C99SUB_ROUNDING_CONTROL_HPP | |
12 | #define BOOST_NUMERIC_INTERVAL_DETAIL_C99SUB_ROUNDING_CONTROL_HPP | |
13 | ||
14 | #include <boost/detail/fenv.hpp> // ISO C 99 rounding mode control | |
15 | ||
16 | namespace boost { | |
17 | namespace numeric { | |
18 | namespace interval_lib { | |
19 | namespace detail { | |
20 | ||
21 | extern "C" { double rint(double); } | |
22 | ||
23 | struct c99_rounding_control | |
24 | { | |
25 | typedef int rounding_mode; | |
26 | ||
27 | static void set_rounding_mode(rounding_mode mode) { fesetround(mode); } | |
28 | static void get_rounding_mode(rounding_mode &mode) { mode = fegetround(); } | |
29 | static void downward() { set_rounding_mode(FE_DOWNWARD); } | |
30 | static void upward() { set_rounding_mode(FE_UPWARD); } | |
31 | static void to_nearest() { set_rounding_mode(FE_TONEAREST); } | |
32 | static void toward_zero() { set_rounding_mode(FE_TOWARDZERO); } | |
33 | ||
34 | template<class T> | |
35 | static T to_int(const T& r) { return rint(r); } | |
36 | }; | |
37 | ||
38 | } // namespace detail | |
39 | } // namespace interval_lib | |
40 | } // namespace numeric | |
41 | } // namespace boost | |
42 | ||
43 | #endif // BOOST_NUMERIC_INTERVAL_DETAIL_C99SUB_ROUBDING_CONTROL_HPP |