source:
vendors/XIOS/current/extern/boost/include/boost/numeric/interval/detail/c99sub_rounding_control.hpp
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1 | /* Boost interval/detail/c99sub_rounding_control.hpp file |
2 | * |
3 | * Copyright 2000 Jens Maurer |
4 | * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion |
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 <fenv.h> // 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 |
24 | { |
25 | typedef int rounding_mode; |
26 | |
27 | static void set_rounding_mode(const 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 |
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