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69 lines
2.1 KiB
69 lines
2.1 KiB
/* Boost interval/arith3.hpp template implementation file |
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* |
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* This headers provides arithmetical functions |
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* which compute an interval given some base |
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* numbers. The resulting interval encloses the |
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* real result of the arithmetic operation. |
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* |
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* Copyright 2003 Guillaume Melquiond |
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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_ARITH3_HPP |
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#define BOOST_NUMERIC_INTERVAL_ARITH3_HPP |
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#include <boost/numeric/interval/detail/interval_prototype.hpp> |
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#include <boost/numeric/interval/detail/test_input.hpp> |
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namespace boost { |
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namespace numeric { |
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namespace interval_lib { |
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template<class I> inline |
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I add(const typename I::base_type& x, const typename I::base_type& y) |
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{ |
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typedef typename I::traits_type Policies; |
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if (detail::test_input<typename I::base_type, Policies>(x, y)) |
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return I::empty(); |
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typename Policies::rounding rnd; |
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return I(rnd.add_down(x, y), rnd.add_up(x, y), true); |
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} |
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template<class I> inline |
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I sub(const typename I::base_type& x, const typename I::base_type& y) |
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{ |
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typedef typename I::traits_type Policies; |
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if (detail::test_input<typename I::base_type, Policies>(x, y)) |
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return I::empty(); |
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typename Policies::rounding rnd; |
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return I(rnd.sub_down(x, y), rnd.sub_up(x, y), true); |
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} |
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template<class I> inline |
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I mul(const typename I::base_type& x, const typename I::base_type& y) |
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{ |
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typedef typename I::traits_type Policies; |
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if (detail::test_input<typename I::base_type, Policies>(x, y)) |
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return I::empty(); |
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typename Policies::rounding rnd; |
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return I(rnd.mul_down(x, y), rnd.mul_up(x, y), true); |
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} |
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template<class I> inline |
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I div(const typename I::base_type& x, const typename I::base_type& y) |
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{ |
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typedef typename I::traits_type Policies; |
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if (detail::test_input<typename I::base_type, Policies>(x, y) || user::is_zero(y)) |
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return I::empty(); |
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typename Policies::rounding rnd; |
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return I(rnd.div_down(x, y), rnd.div_up(x, y), true); |
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} |
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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_ARITH3_HPP
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