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