1 | // © Copyright Fernando Luis Cacciola Carballal 2000-2004 |
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2 | // Use, modification, and distribution is subject to the Boost Software |
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3 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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4 | // http://www.boost.org/LICENSE_1_0.txt) |
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5 | |
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6 | // See library home page at http://www.boost.org/libs/numeric/conversion |
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7 | // |
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8 | // Contact the author at: fernando_cacciola@hotmail.com |
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9 | // |
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10 | #include<cstdlib> |
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11 | #include<iostream> |
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12 | #include<iomanip> |
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13 | #include<string> |
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14 | #include<typeinfo> |
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15 | #include<vector> |
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16 | #include<algorithm> |
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17 | |
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18 | #include "boost/config.hpp" |
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19 | #include "boost/cstdint.hpp" |
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20 | #include "boost/utility.hpp" |
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21 | |
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22 | // |
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23 | // Borland 5.5 lacks the following math overloads |
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24 | // |
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25 | #if BOOST_WORKAROUND(__BORLANDC__, <= 0x551) |
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26 | namespace std |
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27 | { |
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28 | |
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29 | inline float ceil (float x) { return std::ceil ( static_cast<double>(x)); } |
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30 | inline float floor (float x) { return std::floor ( static_cast<double>(x)); } |
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31 | inline long double ceil (long double x) { return std::ceill (x); } |
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32 | inline long double floor (long double x) { return std::floorl(x); } |
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33 | |
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34 | } // namespace std |
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35 | #endif |
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36 | |
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37 | #include "boost/numeric/conversion/converter.hpp" |
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38 | #include "boost/numeric/conversion/cast.hpp" |
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39 | |
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40 | #ifdef __BORLANDC__ |
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41 | #pragma hdrstop |
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42 | #endif |
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43 | |
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44 | #include "test_helpers.cpp" |
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45 | #include "test_helpers2.cpp" |
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46 | #include "test_helpers3.cpp" |
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47 | |
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48 | #include "boost/mpl/alias.hpp" |
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49 | |
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50 | using std::cout ; |
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51 | |
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52 | // A generic 'abs' function. |
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53 | template<class N> inline N absG ( N v ) |
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54 | { |
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55 | return v < static_cast<N>(0) ? static_cast<N>(-v) : v ; |
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56 | } |
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57 | template<> inline unsigned char absG<unsigned char> ( unsigned char v ) { return v ; } |
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58 | template<> inline unsigned short absG<unsigned short> ( unsigned short v ) { return v ; } |
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59 | template<> inline unsigned int absG<unsigned int> ( unsigned int v ) { return v ; } |
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60 | template<> inline unsigned long absG<unsigned long> ( unsigned long v ) { return v ; } |
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61 | |
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62 | template<class T> inline void unused_variable ( T const& ) {} |
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63 | // |
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64 | // The following function excersizes specific conversions that cover |
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65 | // usual and boundary cases for each relevant combination. |
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66 | // |
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67 | void test_conversions() |
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68 | { |
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69 | using namespace boost ; |
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70 | using namespace numeric ; |
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71 | |
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72 | // To help the test found possible bugs a random numbers are used. |
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73 | #if !defined(BOOST_NO_STDC_NAMESPACE) |
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74 | using std::rand ; |
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75 | #endif |
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76 | |
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77 | boost::int16_t v16 ; |
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78 | boost::uint16_t uv16 ; |
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79 | boost::int32_t v32 ; |
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80 | boost::uint32_t uv32 ; |
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81 | |
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82 | volatile float fv ; // avoid this to be cached internally in some fpu register |
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83 | volatile double dv ; // avoid this to be cached internally in some fpu register |
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84 | |
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85 | // |
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86 | // sample (representative) conversions: |
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87 | // |
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88 | cout << "Testing representative conversions\n"; |
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89 | |
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90 | // integral to integral |
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91 | |
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92 | // signed to signed |
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93 | |
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94 | // not subranged |
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95 | v16 = static_cast<boost::int16_t>(rand()); |
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96 | TEST_SUCCEEDING_CONVERSION_DEF(boost::int32_t,boost::int16_t,v16,v16); |
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97 | |
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98 | // subranged |
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99 | v16 = static_cast<boost::int16_t>(rand()); |
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100 | TEST_SUCCEEDING_CONVERSION_DEF(boost::int16_t,boost::int32_t,v16,v16); |
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101 | TEST_POS_OVERFLOW_CONVERSION_DEF(boost::int16_t,boost::int32_t,bounds<boost::int16_t>::highest() + boost::int32_t(1) ) ; |
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102 | TEST_NEG_OVERFLOW_CONVERSION_DEF(boost::int16_t,boost::int32_t,bounds<boost::int16_t>::lowest() - boost::int32_t(1) ) ; |
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103 | |
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104 | // signed to unsigned |
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105 | |
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106 | // subranged |
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107 | v32 = absG(static_cast<boost::int32_t>(rand())); |
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108 | v16 = absG(static_cast<boost::int16_t>(rand())); |
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109 | TEST_SUCCEEDING_CONVERSION_DEF(boost::uint32_t,boost::int32_t,v32,v32); |
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110 | TEST_SUCCEEDING_CONVERSION_DEF(boost::uint16_t,boost::int32_t,v16,v16); |
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111 | TEST_POS_OVERFLOW_CONVERSION_DEF(boost::uint16_t,boost::int32_t,bounds<boost::uint16_t>::highest() + boost::int32_t(1) ) ; |
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112 | TEST_NEG_OVERFLOW_CONVERSION_DEF(boost::uint32_t,boost::int32_t,boost::int32_t(-1) ) ; |
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113 | |
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114 | // unsigned to signed |
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115 | |
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116 | // not subranged |
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117 | v32 = absG(static_cast<boost::int32_t>(rand())); |
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118 | TEST_SUCCEEDING_CONVERSION_DEF(boost::int32_t,boost::uint32_t,v32,v32); |
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119 | |
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120 | // subranged |
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121 | v16 = absG(static_cast<boost::int16_t>(rand())); |
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122 | TEST_SUCCEEDING_CONVERSION_DEF(boost::int16_t,boost::uint32_t,v16,v16); |
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123 | TEST_POS_OVERFLOW_CONVERSION_DEF(boost::int32_t,boost::uint32_t,bounds<boost::uint32_t>::highest() ) ; |
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124 | TEST_POS_OVERFLOW_CONVERSION_DEF(boost::int16_t,boost::uint32_t,bounds<boost::uint32_t>::highest() ) ; |
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125 | |
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126 | // unsigned to unsigned |
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127 | |
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128 | // not subranged |
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129 | uv16 = static_cast<boost::uint16_t>(rand()); |
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130 | TEST_SUCCEEDING_CONVERSION_DEF(boost::uint32_t,boost::uint16_t,uv16,uv16); |
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131 | |
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132 | // subranged |
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133 | uv16 = static_cast<boost::uint16_t>(rand()); |
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134 | TEST_SUCCEEDING_CONVERSION_DEF(boost::uint16_t,boost::uint32_t,uv16,uv16); |
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135 | TEST_POS_OVERFLOW_CONVERSION_DEF(boost::uint16_t,boost::uint32_t,bounds<boost::uint32_t>::highest() ) ; |
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136 | |
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137 | // integral to float |
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138 | |
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139 | // from signed integral |
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140 | v32 = static_cast<boost::int32_t>(rand()); |
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141 | TEST_SUCCEEDING_CONVERSION_DEF(double,boost::int32_t,v32,v32); |
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142 | |
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143 | // from uint32_tegral |
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144 | uv32 = static_cast<boost::uint32_t>(rand()); |
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145 | TEST_SUCCEEDING_CONVERSION_DEF(double,boost::uint32_t,uv32,uv32); |
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146 | |
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147 | // float to integral |
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148 | |
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149 | // to signed integral |
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150 | v32 = static_cast<boost::int32_t>(rand()); |
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151 | TEST_SUCCEEDING_CONVERSION_DEF(boost::int32_t,double,v32,v32); |
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152 | |
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153 | dv = static_cast<double>(bounds<boost::uint32_t>::highest()) + 1.0 ; |
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154 | TEST_POS_OVERFLOW_CONVERSION_DEF(boost::int32_t,double,dv) ; |
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155 | TEST_NEG_OVERFLOW_CONVERSION_DEF(boost::int32_t,double,-dv) ; |
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156 | |
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157 | // float to float |
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158 | |
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159 | // not subranged |
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160 | fv = static_cast<float>(rand()) / static_cast<float>(3) ; |
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161 | TEST_SUCCEEDING_CONVERSION_DEF(double,float,fv,fv); |
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162 | |
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163 | |
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164 | // subranged |
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165 | fv = static_cast<float>(rand()) / static_cast<float>(3) ; |
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166 | TEST_SUCCEEDING_CONVERSION_DEF(float,double,fv,fv); |
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167 | TEST_POS_OVERFLOW_CONVERSION_DEF(float,double,bounds<double>::highest()) ; |
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168 | TEST_NEG_OVERFLOW_CONVERSION_DEF(float,double,bounds<double>::lowest ()) ; |
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169 | } |
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170 | |
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171 | // Custom OverflowHandler |
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172 | struct custom_overflow_handler |
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173 | { |
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174 | void operator() ( boost::numeric::range_check_result r ) |
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175 | { |
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176 | if ( r == boost::numeric::cNegOverflow ) |
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177 | cout << "negative_overflow detected!\n" ; |
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178 | else if ( r == boost::numeric::cPosOverflow ) |
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179 | cout << "positive_overflow detected!\n" ; |
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180 | } |
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181 | } ; |
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182 | |
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183 | template<class T, class S,class OverflowHandler> |
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184 | void test_overflow_handler( MATCH_FNTPL_ARG(T), MATCH_FNTPL_ARG(S), MATCH_FNTPL_ARG(OverflowHandler), |
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185 | PostCondition pos, |
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186 | PostCondition neg |
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187 | ) |
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188 | { |
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189 | typedef boost::numeric::conversion_traits<T,S> traits ; |
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190 | typedef boost::numeric::converter<T,S,traits,OverflowHandler> converter ; |
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191 | |
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192 | static const S psrc = boost::numeric::bounds<S>::highest(); |
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193 | static const S nsrc = boost::numeric::bounds<S>::lowest (); |
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194 | |
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195 | static const T pres = static_cast<T>(psrc); |
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196 | static const T nres = static_cast<T>(nsrc); |
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197 | |
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198 | test_conv_base ( ConversionInstance<converter>(pres,psrc,pos) ) ; |
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199 | test_conv_base ( ConversionInstance<converter>(nres,nsrc,neg) ) ; |
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200 | } |
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201 | |
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202 | template<class T, class S> |
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203 | void test_overflow_handlers( MATCH_FNTPL_ARG(T), MATCH_FNTPL_ARG(S) ) |
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204 | { |
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205 | cout << "Testing Silent Overflow Handler policy\n"; |
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206 | |
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207 | test_overflow_handler( SET_FNTPL_ARG(T), |
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208 | SET_FNTPL_ARG(S), |
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209 | SET_FNTPL_ARG(boost::numeric::silent_overflow_handler), |
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210 | c_converted, |
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211 | c_converted |
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212 | ) ; |
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213 | |
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214 | cout << "Testing Default Overflow Handler policy\n"; |
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215 | |
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216 | test_overflow_handler( SET_FNTPL_ARG(T), |
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217 | SET_FNTPL_ARG(S), |
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218 | SET_FNTPL_ARG(boost::numeric::def_overflow_handler), |
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219 | c_pos_overflow, |
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220 | c_neg_overflow |
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221 | ) ; |
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222 | |
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223 | cout << "Testing Custom (User-Defined) Overflow Handler policy\n"; |
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224 | |
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225 | test_overflow_handler( SET_FNTPL_ARG(T), |
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226 | SET_FNTPL_ARG(S), |
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227 | SET_FNTPL_ARG(custom_overflow_handler), |
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228 | c_converted, |
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229 | c_converted |
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230 | ) ; |
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231 | } |
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232 | |
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233 | // For a given float-type number 'n' of integer value (n.0), check the conversions |
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234 | // within the range [n-1,n+1] taking values at: (n-1,n-0.5,n,n+0.5,n+1). |
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235 | // For each sampled value there is an expected result and a PostCondition according to the |
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236 | // specified round_style. |
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237 | // |
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238 | template<class T, class S, class Float2IntRounder> |
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239 | void test_rounding_conversion ( MATCH_FNTPL_ARG(T), MATCH_FNTPL_ARG(Float2IntRounder), |
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240 | S s, |
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241 | PostCondition resl1, |
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242 | PostCondition resl0, |
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243 | PostCondition res, |
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244 | PostCondition resr0, |
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245 | PostCondition resr1 |
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246 | ) |
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247 | { |
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248 | typedef boost::numeric::conversion_traits<T,S> Traits ; |
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249 | |
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250 | typedef boost::numeric::converter<T,S, Traits, boost::numeric::def_overflow_handler,Float2IntRounder> |
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251 | Converter ; |
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252 | |
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253 | S sl1 = s - static_cast<S>(1); |
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254 | S sl0 = s - static_cast<S>(0.5); |
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255 | S sr0 = s + static_cast<S>(0.5); |
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256 | S sr1 = s + static_cast<S>(1); |
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257 | |
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258 | T tl1 = static_cast<T>( Converter::nearbyint(sl1) ); |
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259 | T tl0 = static_cast<T>( Converter::nearbyint(sl0) ); |
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260 | T t = static_cast<T>( Converter::nearbyint(s) ); |
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261 | T tr0 = static_cast<T>( Converter::nearbyint(sr0) ); |
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262 | T tr1 = static_cast<T>( Converter::nearbyint(sr1) ); |
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263 | |
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264 | test_conv_base ( ConversionInstance<Converter>(tl1,sl1,resl1) ) ; |
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265 | test_conv_base ( ConversionInstance<Converter>(tl0,sl0,resl0) ) ; |
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266 | test_conv_base ( ConversionInstance<Converter>(t,s,res) ) ; |
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267 | test_conv_base ( ConversionInstance<Converter>(tr0,sr0,resr0) ) ; |
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268 | test_conv_base ( ConversionInstance<Converter>(tr1,sr1,resr1) ) ; |
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269 | } |
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270 | |
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271 | |
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272 | template<class T,class S> |
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273 | void test_round_style( MATCH_FNTPL_ARG(T), MATCH_FNTPL_ARG(S) ) |
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274 | { |
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275 | S min = boost::numeric::bounds<T>::lowest(); |
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276 | S max = boost::numeric::bounds<T>::highest(); |
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277 | |
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278 | cout << "Testing 'Trunc' Float2IntRounder policy\n"; |
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279 | |
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280 | test_rounding_conversion(SET_FNTPL_ARG(T), |
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281 | SET_FNTPL_ARG(boost::numeric::Trunc<S>), |
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282 | min, |
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283 | c_neg_overflow, |
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284 | c_converted, |
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285 | c_converted, |
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286 | c_converted, |
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287 | c_converted |
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288 | ) ; |
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289 | |
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290 | test_rounding_conversion(SET_FNTPL_ARG(T), |
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291 | SET_FNTPL_ARG(boost::numeric::Trunc<S>), |
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292 | max, |
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293 | c_converted, |
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294 | c_converted, |
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295 | c_converted, |
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296 | c_converted, |
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297 | c_pos_overflow |
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298 | ) ; |
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299 | |
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300 | cout << "Testing 'RoundEven' Float2IntRounder policy\n"; |
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301 | |
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302 | test_rounding_conversion(SET_FNTPL_ARG(T), |
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303 | SET_FNTPL_ARG(boost::numeric::RoundEven<S>), |
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304 | min, |
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305 | c_neg_overflow, |
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306 | c_converted, |
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307 | c_converted, |
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308 | c_converted, |
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309 | c_converted |
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310 | ) ; |
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311 | |
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312 | test_rounding_conversion(SET_FNTPL_ARG(T), |
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313 | SET_FNTPL_ARG(boost::numeric::RoundEven<S>), |
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314 | max, |
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315 | c_converted, |
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316 | c_converted, |
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317 | c_converted, |
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318 | c_pos_overflow, |
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319 | c_pos_overflow |
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320 | ) ; |
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321 | |
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322 | cout << "Testing 'Ceil' Float2IntRounder policy\n"; |
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323 | |
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324 | test_rounding_conversion(SET_FNTPL_ARG(T), |
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325 | SET_FNTPL_ARG(boost::numeric::Ceil<S>), |
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326 | min, |
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327 | c_neg_overflow, |
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328 | c_converted, |
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329 | c_converted, |
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330 | c_converted, |
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331 | c_converted |
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332 | ) ; |
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333 | |
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334 | test_rounding_conversion(SET_FNTPL_ARG(T), |
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335 | SET_FNTPL_ARG(boost::numeric::Ceil<S>), |
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336 | max, |
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337 | c_converted, |
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338 | c_converted, |
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339 | c_converted, |
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340 | c_pos_overflow, |
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341 | c_pos_overflow |
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342 | ) ; |
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343 | |
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344 | cout << "Testing 'Floor' Float2IntRounder policy\n" ; |
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345 | |
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346 | test_rounding_conversion(SET_FNTPL_ARG(T), |
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347 | SET_FNTPL_ARG(boost::numeric::Floor<S>), |
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348 | min, |
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349 | c_neg_overflow, |
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350 | c_neg_overflow, |
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351 | c_converted, |
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352 | c_converted, |
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353 | c_converted |
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354 | ) ; |
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355 | |
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356 | test_rounding_conversion(SET_FNTPL_ARG(T), |
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357 | SET_FNTPL_ARG(boost::numeric::Floor<S>), |
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358 | max, |
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359 | c_converted, |
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360 | c_converted, |
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361 | c_converted, |
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362 | c_converted, |
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363 | c_pos_overflow |
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364 | ) ; |
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365 | |
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366 | } |
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367 | |
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368 | void test_round_even( double n, double x ) |
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369 | { |
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370 | double r = boost::numeric::RoundEven<double>::nearbyint(n); |
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371 | BOOST_CHECK( r == x ) ; |
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372 | } |
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373 | |
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374 | void test_round_even() |
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375 | { |
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376 | cout << "Testing 'RoundEven' tie-breaking\n"; |
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377 | |
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378 | double min = boost::numeric::bounds<double>::lowest(); |
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379 | double max = boost::numeric::bounds<double>::highest(); |
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380 | |
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381 | #if !defined(BOOST_NO_STDC_NAMESPACE) |
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382 | using std::floor ; |
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383 | using std::ceil ; |
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384 | #endif |
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385 | test_round_even(min, floor(min)); |
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386 | test_round_even(max, ceil (max)); |
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387 | test_round_even(2.0, 2.0); |
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388 | test_round_even(2.3, 2.0); |
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389 | test_round_even(2.5, 2.0); |
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390 | test_round_even(2.7, 3.0); |
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391 | test_round_even(3.0, 3.0); |
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392 | test_round_even(3.3, 3.0); |
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393 | test_round_even(3.5, 4.0); |
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394 | test_round_even(3.7, 4.0); |
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395 | } |
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396 | |
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397 | int double_to_int ( double n ) { return static_cast<int>(n) ; } |
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398 | |
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399 | void test_converter_as_function_object() |
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400 | { |
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401 | cout << "Testing converter as function object.\n"; |
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402 | |
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403 | // Create a sample sequence of double values. |
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404 | std::vector<double> S ; |
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405 | for ( int i = 0 ; i < 10 ; ++ i ) |
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406 | S.push_back( i * ( 18.0 / 19.0 ) ); |
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407 | |
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408 | // Create a sequence of int values from 's' using the standard conversion. |
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409 | std::vector<int> W ; |
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410 | std::transform(S.begin(),S.end(),std::back_inserter(W),double_to_int); |
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411 | |
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412 | // Create a sequence of int values from s using a default numeric::converter |
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413 | std::vector<int> I ; |
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414 | std::transform(S.begin(), |
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415 | S.end(), |
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416 | std::back_inserter(I), |
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417 | boost::numeric::converter<int,double>() |
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418 | ) ; |
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419 | |
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420 | // Match 'w' and 'i' which should be equal. |
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421 | bool double_to_int_OK = std::equal(W.begin(),W.end(),I.begin()) ; |
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422 | BOOST_CHECK_MESSAGE(double_to_int_OK, "converter (int,double) as function object"); |
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423 | |
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424 | // Create a sequence of double values from s using a default numeric::converter (which should be the trivial conv). |
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425 | std::vector<double> D ; |
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426 | std::transform(S.begin(), |
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427 | S.end(), |
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428 | std::back_inserter(D), |
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429 | boost::numeric::converter<double,double>() |
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430 | ) ; |
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431 | |
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432 | // Match 's' and 'd' which should be equal. |
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433 | bool double_to_double_OK = std::equal(S.begin(),S.end(),D.begin()) ; |
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434 | BOOST_CHECK_MESSAGE(double_to_double_OK, "converter (double,double) as function object"); |
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435 | } |
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436 | |
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437 | #if BOOST_WORKAROUND(__IBMCPP__, <= 600 ) // VCAPP6 |
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438 | # define UNOPTIMIZED |
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439 | #else |
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440 | # define UNOPTIMIZED volatile |
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441 | #endif |
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442 | |
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443 | void test_optimizations() |
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444 | { |
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445 | using namespace boost; |
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446 | using namespace numeric; |
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447 | |
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448 | float fv0 = 18.0f / 19.0f ; |
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449 | |
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450 | // This code deosn't produce any output. |
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451 | // It is intended to show the optimization of numeric::converter<> by manual inspection |
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452 | // of the generated code. |
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453 | // Each test shows first the equivalent hand-coded version. |
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454 | // The numeric_cast<> code should be the same if full compiler optimization/inlining is used. |
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455 | |
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456 | //--------------------------------- |
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457 | // trivial conversion. |
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458 | // |
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459 | // equivalent code: |
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460 | UNOPTIMIZED float fv1a = fv0 ; |
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461 | |
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462 | float fv1b = numeric_cast<float>(fv0); |
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463 | unused_variable(fv1a); |
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464 | unused_variable(fv1b); |
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465 | // |
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466 | //--------------------------------- |
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467 | |
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468 | //--------------------------------- |
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469 | // nonsubranged conversion. |
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470 | // |
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471 | // equivalent code: |
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472 | UNOPTIMIZED double dv1a = static_cast<double>(fv0); |
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473 | |
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474 | double dv1b = numeric_cast<double>(fv0); |
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475 | unused_variable(dv1a); |
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476 | unused_variable(dv1b); |
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477 | // |
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478 | //--------------------------------- |
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479 | |
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480 | //------------------------------------------------------ |
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481 | // subranged conversion with both-sided range checking. |
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482 | // |
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483 | |
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484 | // equivalent code: |
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485 | |
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486 | { |
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487 | double const& s = dv1b ; |
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488 | // range checking |
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489 | range_check_result r = s < static_cast<double>(bounds<float>::lowest()) |
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490 | ? cNegOverflow : cInRange ; |
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491 | if ( r == cInRange ) |
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492 | { |
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493 | r = s > static_cast<double>(bounds<float>::highest()) ? cPosOverflow : cInRange ; |
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494 | } |
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495 | if ( r == cNegOverflow ) |
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496 | throw negative_overflow() ; |
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497 | else if ( r == cPosOverflow ) |
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498 | throw positive_overflow() ; |
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499 | // conversion |
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500 | UNOPTIMIZED float fv2a = static_cast<float>(s); |
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501 | unused_variable(fv2a); |
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502 | } |
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503 | |
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504 | float fv2b = numeric_cast<float>(dv1b); |
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505 | unused_variable(fv2b); |
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506 | // |
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507 | //--------------------------------- |
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508 | |
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509 | |
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510 | //--------------------------------- |
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511 | // subranged rounding conversion |
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512 | // |
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513 | // equivalent code: |
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514 | |
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515 | { |
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516 | double const& s = dv1b ; |
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517 | // range checking |
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518 | range_check_result r = s <= static_cast<double>(bounds<int>::lowest()) - static_cast<double>(1.0) |
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519 | ? cNegOverflow : cInRange ; |
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520 | if ( r == cInRange ) |
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521 | { |
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522 | r = s >= static_cast<double>(bounds<int>::highest()) + static_cast<double>(1.0) |
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523 | ? cPosOverflow : cInRange ; |
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524 | } |
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525 | if ( r == cNegOverflow ) |
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526 | throw negative_overflow() ; |
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527 | else if ( r == cPosOverflow ) |
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528 | throw positive_overflow() ; |
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529 | // rounding |
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530 | |
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531 | #if !defined(BOOST_NO_STDC_NAMESPACE) |
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532 | using std::floor ; |
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533 | #endif |
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534 | |
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535 | double s1 = floor(dv1b + 0.5); |
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536 | |
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537 | // conversion |
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538 | UNOPTIMIZED int iv1a = static_cast<int>(s1); |
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539 | unused_variable(iv1a); |
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540 | } |
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541 | |
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542 | int iv1b = numeric_cast<int>(dv1b); |
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543 | unused_variable(iv1b); |
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544 | // |
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545 | //--------------------------------- |
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546 | } |
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547 | |
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548 | int test_main( int, char* argv[] ) |
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549 | { |
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550 | std::cout << std::setprecision( std::numeric_limits<long double>::digits10 ) ; |
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551 | |
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552 | test_conversions(); |
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553 | test_overflow_handlers( SET_FNTPL_ARG(boost::int16_t), SET_FNTPL_ARG(boost::int32_t)); |
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554 | test_round_style(SET_FNTPL_ARG(boost::int32_t), SET_FNTPL_ARG(double) ) ; |
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555 | test_round_even() ; |
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556 | test_converter_as_function_object(); |
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557 | test_optimizations() ; |
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558 | |
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559 | return 0; |
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560 | } |
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561 | //--------------------------------------------------------------------------- |
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562 | |
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