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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