[12] | 1 | /* Boost interval/arith.hpp template implementation file |
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| 2 | * |
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| 3 | * Copyright 2000 Jens Maurer |
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| 4 | * Copyright 2002-2003 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion |
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| 5 | * |
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| 6 | * Distributed under the Boost Software License, Version 1.0. |
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| 7 | * (See accompanying file LICENSE_1_0.txt or |
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| 8 | * copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 9 | */ |
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| 10 | |
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| 11 | #ifndef BOOST_NUMERIC_INTERVAL_ARITH_HPP |
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| 12 | #define BOOST_NUMERIC_INTERVAL_ARITH_HPP |
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| 13 | |
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| 14 | #include <boost/config.hpp> |
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| 15 | #include <boost/numeric/interval/interval.hpp> |
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| 16 | #include <boost/numeric/interval/detail/bugs.hpp> |
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| 17 | #include <boost/numeric/interval/detail/test_input.hpp> |
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| 18 | #include <boost/numeric/interval/detail/division.hpp> |
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| 19 | #include <algorithm> |
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| 20 | |
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| 21 | namespace boost { |
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| 22 | namespace numeric { |
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| 23 | |
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| 24 | /* |
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| 25 | * Basic arithmetic operators |
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| 26 | */ |
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| 27 | |
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| 28 | template<class T, class Policies> inline |
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| 29 | const interval<T, Policies>& operator+(const interval<T, Policies>& x) |
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| 30 | { |
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| 31 | return x; |
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| 32 | } |
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| 33 | |
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| 34 | template<class T, class Policies> inline |
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| 35 | interval<T, Policies> operator-(const interval<T, Policies>& x) |
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| 36 | { |
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| 37 | if (interval_lib::detail::test_input(x)) |
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| 38 | return interval<T, Policies>::empty(); |
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| 39 | return interval<T, Policies>(-x.upper(), -x.lower(), true); |
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| 40 | } |
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| 41 | |
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| 42 | template<class T, class Policies> inline |
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| 43 | interval<T, Policies>& interval<T, Policies>::operator+=(const interval<T, Policies>& r) |
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| 44 | { |
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| 45 | if (interval_lib::detail::test_input(*this, r)) |
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| 46 | set_empty(); |
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| 47 | else { |
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| 48 | typename Policies::rounding rnd; |
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| 49 | set(rnd.add_down(low, r.low), rnd.add_up(up, r.up)); |
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| 50 | } |
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| 51 | return *this; |
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| 52 | } |
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| 53 | |
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| 54 | template<class T, class Policies> inline |
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| 55 | interval<T, Policies>& interval<T, Policies>::operator+=(const T& r) |
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| 56 | { |
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| 57 | if (interval_lib::detail::test_input(*this, r)) |
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| 58 | set_empty(); |
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| 59 | else { |
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| 60 | typename Policies::rounding rnd; |
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| 61 | set(rnd.add_down(low, r), rnd.add_up(up, r)); |
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| 62 | } |
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| 63 | return *this; |
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| 64 | } |
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| 65 | |
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| 66 | template<class T, class Policies> inline |
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| 67 | interval<T, Policies>& interval<T, Policies>::operator-=(const interval<T, Policies>& r) |
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| 68 | { |
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| 69 | if (interval_lib::detail::test_input(*this, r)) |
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| 70 | set_empty(); |
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| 71 | else { |
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| 72 | typename Policies::rounding rnd; |
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| 73 | set(rnd.sub_down(low, r.up), rnd.sub_up(up, r.low)); |
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| 74 | } |
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| 75 | return *this; |
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| 76 | } |
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| 77 | |
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| 78 | template<class T, class Policies> inline |
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| 79 | interval<T, Policies>& interval<T, Policies>::operator-=(const T& r) |
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| 80 | { |
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| 81 | if (interval_lib::detail::test_input(*this, r)) |
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| 82 | set_empty(); |
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| 83 | else { |
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| 84 | typename Policies::rounding rnd; |
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| 85 | set(rnd.sub_down(low, r), rnd.sub_up(up, r)); |
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| 86 | } |
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| 87 | return *this; |
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| 88 | } |
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| 89 | |
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| 90 | template<class T, class Policies> inline |
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| 91 | interval<T, Policies>& interval<T, Policies>::operator*=(const interval<T, Policies>& r) |
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| 92 | { |
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| 93 | return *this = *this * r; |
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| 94 | } |
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| 95 | |
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| 96 | template<class T, class Policies> inline |
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| 97 | interval<T, Policies>& interval<T, Policies>::operator*=(const T& r) |
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| 98 | { |
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| 99 | return *this = r * *this; |
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| 100 | } |
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| 101 | |
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| 102 | template<class T, class Policies> inline |
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| 103 | interval<T, Policies>& interval<T, Policies>::operator/=(const interval<T, Policies>& r) |
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| 104 | { |
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| 105 | return *this = *this / r; |
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| 106 | } |
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| 107 | |
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| 108 | template<class T, class Policies> inline |
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| 109 | interval<T, Policies>& interval<T, Policies>::operator/=(const T& r) |
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| 110 | { |
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| 111 | return *this = *this / r; |
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| 112 | } |
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| 113 | |
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| 114 | template<class T, class Policies> inline |
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| 115 | interval<T, Policies> operator+(const interval<T, Policies>& x, |
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| 116 | const interval<T, Policies>& y) |
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| 117 | { |
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| 118 | if (interval_lib::detail::test_input(x, y)) |
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| 119 | return interval<T, Policies>::empty(); |
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| 120 | typename Policies::rounding rnd; |
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| 121 | return interval<T,Policies>(rnd.add_down(x.lower(), y.lower()), |
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| 122 | rnd.add_up (x.upper(), y.upper()), true); |
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| 123 | } |
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| 124 | |
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| 125 | template<class T, class Policies> inline |
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| 126 | interval<T, Policies> operator+(const T& x, const interval<T, Policies>& y) |
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| 127 | { |
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| 128 | if (interval_lib::detail::test_input(x, y)) |
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| 129 | return interval<T, Policies>::empty(); |
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| 130 | typename Policies::rounding rnd; |
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| 131 | return interval<T,Policies>(rnd.add_down(x, y.lower()), |
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| 132 | rnd.add_up (x, y.upper()), true); |
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| 133 | } |
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| 134 | |
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| 135 | template<class T, class Policies> inline |
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| 136 | interval<T, Policies> operator+(const interval<T, Policies>& x, const T& y) |
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| 137 | { return y + x; } |
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| 138 | |
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| 139 | template<class T, class Policies> inline |
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| 140 | interval<T, Policies> operator-(const interval<T, Policies>& x, |
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| 141 | const interval<T, Policies>& y) |
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| 142 | { |
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| 143 | if (interval_lib::detail::test_input(x, y)) |
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| 144 | return interval<T, Policies>::empty(); |
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| 145 | typename Policies::rounding rnd; |
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| 146 | return interval<T,Policies>(rnd.sub_down(x.lower(), y.upper()), |
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| 147 | rnd.sub_up (x.upper(), y.lower()), true); |
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| 148 | } |
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| 149 | |
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| 150 | template<class T, class Policies> inline |
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| 151 | interval<T, Policies> operator-(const T& x, const interval<T, Policies>& y) |
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| 152 | { |
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| 153 | if (interval_lib::detail::test_input(x, y)) |
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| 154 | return interval<T, Policies>::empty(); |
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| 155 | typename Policies::rounding rnd; |
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| 156 | return interval<T,Policies>(rnd.sub_down(x, y.upper()), |
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| 157 | rnd.sub_up (x, y.lower()), true); |
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| 158 | } |
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| 159 | |
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| 160 | template<class T, class Policies> inline |
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| 161 | interval<T, Policies> operator-(const interval<T, Policies>& x, const T& y) |
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| 162 | { |
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| 163 | if (interval_lib::detail::test_input(x, y)) |
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| 164 | return interval<T, Policies>::empty(); |
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| 165 | typename Policies::rounding rnd; |
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| 166 | return interval<T,Policies>(rnd.sub_down(x.lower(), y), |
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| 167 | rnd.sub_up (x.upper(), y), true); |
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| 168 | } |
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| 169 | |
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| 170 | template<class T, class Policies> inline |
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| 171 | interval<T, Policies> operator*(const interval<T, Policies>& x, |
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| 172 | const interval<T, Policies>& y) |
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| 173 | { |
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| 174 | BOOST_USING_STD_MIN(); |
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| 175 | BOOST_USING_STD_MAX(); |
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| 176 | typedef interval<T, Policies> I; |
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| 177 | if (interval_lib::detail::test_input(x, y)) |
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| 178 | return I::empty(); |
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| 179 | typename Policies::rounding rnd; |
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| 180 | const T& xl = x.lower(); |
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| 181 | const T& xu = x.upper(); |
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| 182 | const T& yl = y.lower(); |
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| 183 | const T& yu = y.upper(); |
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| 184 | |
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| 185 | if (interval_lib::user::is_neg(xl)) |
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| 186 | if (interval_lib::user::is_pos(xu)) |
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| 187 | if (interval_lib::user::is_neg(yl)) |
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| 188 | if (interval_lib::user::is_pos(yu)) // M * M |
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| 189 | return I(min BOOST_PREVENT_MACRO_SUBSTITUTION(rnd.mul_down(xl, yu), rnd.mul_down(xu, yl)), |
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| 190 | max BOOST_PREVENT_MACRO_SUBSTITUTION(rnd.mul_up (xl, yl), rnd.mul_up (xu, yu)), true); |
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| 191 | else // M * N |
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| 192 | return I(rnd.mul_down(xu, yl), rnd.mul_up(xl, yl), true); |
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| 193 | else |
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| 194 | if (interval_lib::user::is_pos(yu)) // M * P |
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| 195 | return I(rnd.mul_down(xl, yu), rnd.mul_up(xu, yu), true); |
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| 196 | else // M * Z |
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| 197 | return I(static_cast<T>(0), static_cast<T>(0), true); |
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| 198 | else |
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| 199 | if (interval_lib::user::is_neg(yl)) |
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| 200 | if (interval_lib::user::is_pos(yu)) // N * M |
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| 201 | return I(rnd.mul_down(xl, yu), rnd.mul_up(xl, yl), true); |
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| 202 | else // N * N |
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| 203 | return I(rnd.mul_down(xu, yu), rnd.mul_up(xl, yl), true); |
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| 204 | else |
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| 205 | if (interval_lib::user::is_pos(yu)) // N * P |
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| 206 | return I(rnd.mul_down(xl, yu), rnd.mul_up(xu, yl), true); |
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| 207 | else // N * Z |
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| 208 | return I(static_cast<T>(0), static_cast<T>(0), true); |
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| 209 | else |
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| 210 | if (interval_lib::user::is_pos(xu)) |
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| 211 | if (interval_lib::user::is_neg(yl)) |
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| 212 | if (interval_lib::user::is_pos(yu)) // P * M |
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| 213 | return I(rnd.mul_down(xu, yl), rnd.mul_up(xu, yu), true); |
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| 214 | else // P * N |
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| 215 | return I(rnd.mul_down(xu, yl), rnd.mul_up(xl, yu), true); |
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| 216 | else |
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| 217 | if (interval_lib::user::is_pos(yu)) // P * P |
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| 218 | return I(rnd.mul_down(xl, yl), rnd.mul_up(xu, yu), true); |
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| 219 | else // P * Z |
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| 220 | return I(static_cast<T>(0), static_cast<T>(0), true); |
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| 221 | else // Z * ? |
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| 222 | return I(static_cast<T>(0), static_cast<T>(0), true); |
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| 223 | } |
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| 224 | |
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| 225 | template<class T, class Policies> inline |
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| 226 | interval<T, Policies> operator*(const T& x, const interval<T, Policies>& y) |
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| 227 | { |
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| 228 | typedef interval<T, Policies> I; |
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| 229 | if (interval_lib::detail::test_input(x, y)) |
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| 230 | return I::empty(); |
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| 231 | typename Policies::rounding rnd; |
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| 232 | const T& yl = y.lower(); |
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| 233 | const T& yu = y.upper(); |
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| 234 | // x is supposed not to be infinite |
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| 235 | if (interval_lib::user::is_neg(x)) |
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| 236 | return I(rnd.mul_down(x, yu), rnd.mul_up(x, yl), true); |
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| 237 | else if (interval_lib::user::is_zero(x)) |
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| 238 | return I(static_cast<T>(0), static_cast<T>(0), true); |
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| 239 | else |
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| 240 | return I(rnd.mul_down(x, yl), rnd.mul_up(x, yu), true); |
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| 241 | } |
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| 242 | |
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| 243 | template<class T, class Policies> inline |
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| 244 | interval<T, Policies> operator*(const interval<T, Policies>& x, const T& y) |
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| 245 | { return y * x; } |
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| 246 | |
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| 247 | template<class T, class Policies> inline |
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| 248 | interval<T, Policies> operator/(const interval<T, Policies>& x, |
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| 249 | const interval<T, Policies>& y) |
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| 250 | { |
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| 251 | if (interval_lib::detail::test_input(x, y)) |
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| 252 | return interval<T, Policies>::empty(); |
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| 253 | if (in_zero(y)) |
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| 254 | if (!interval_lib::user::is_zero(y.lower())) |
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| 255 | if (!interval_lib::user::is_zero(y.upper())) |
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| 256 | return interval_lib::detail::div_zero(x); |
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| 257 | else |
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| 258 | return interval_lib::detail::div_negative(x, y.lower()); |
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| 259 | else |
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| 260 | if (!interval_lib::user::is_zero(y.upper())) |
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| 261 | return interval_lib::detail::div_positive(x, y.upper()); |
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| 262 | else |
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| 263 | return interval<T, Policies>::empty(); |
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| 264 | else |
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| 265 | return interval_lib::detail::div_non_zero(x, y); |
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| 266 | } |
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| 267 | |
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| 268 | template<class T, class Policies> inline |
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| 269 | interval<T, Policies> operator/(const T& x, const interval<T, Policies>& y) |
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| 270 | { |
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| 271 | if (interval_lib::detail::test_input(x, y)) |
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| 272 | return interval<T, Policies>::empty(); |
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| 273 | if (in_zero(y)) |
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| 274 | if (!interval_lib::user::is_zero(y.lower())) |
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| 275 | if (!interval_lib::user::is_zero(y.upper())) |
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| 276 | return interval_lib::detail::div_zero<T, Policies>(x); |
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| 277 | else |
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| 278 | return interval_lib::detail::div_negative<T, Policies>(x, y.lower()); |
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| 279 | else |
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| 280 | if (!interval_lib::user::is_zero(y.upper())) |
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| 281 | return interval_lib::detail::div_positive<T, Policies>(x, y.upper()); |
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| 282 | else |
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| 283 | return interval<T, Policies>::empty(); |
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| 284 | else |
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| 285 | return interval_lib::detail::div_non_zero(x, y); |
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| 286 | } |
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| 287 | |
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| 288 | template<class T, class Policies> inline |
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| 289 | interval<T, Policies> operator/(const interval<T, Policies>& x, const T& y) |
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| 290 | { |
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| 291 | if (interval_lib::detail::test_input(x, y) || interval_lib::user::is_zero(y)) |
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| 292 | return interval<T, Policies>::empty(); |
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| 293 | typename Policies::rounding rnd; |
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| 294 | const T& xl = x.lower(); |
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| 295 | const T& xu = x.upper(); |
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| 296 | if (interval_lib::user::is_neg(y)) |
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| 297 | return interval<T, Policies>(rnd.div_down(xu, y), rnd.div_up(xl, y), true); |
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| 298 | else |
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| 299 | return interval<T, Policies>(rnd.div_down(xl, y), rnd.div_up(xu, y), true); |
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| 300 | } |
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| 301 | |
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| 302 | } // namespace numeric |
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| 303 | } // namespace boost |
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| 304 | |
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| 305 | #endif // BOOST_NUMERIC_INTERVAL_ARITH_HPP |
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