[857] | 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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