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1 /* boost integer_traits.hpp header file |
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2 * |
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3 * Copyright Jens Maurer 2000 |
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4 * Distributed under the Boost Software License, Version 1.0. (See |
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5 * accompanying file LICENSE_1_0.txt or copy at |
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6 * http://www.boost.org/LICENSE_1_0.txt) |
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7 * |
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8 * $Id: integer_traits.hpp 32576 2006-02-05 10:19:42Z johnmaddock $ |
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9 * |
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10 * Idea by Beman Dawes, Ed Brey, Steve Cleary, and Nathan Myers |
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11 */ |
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12 |
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13 // See http://www.boost.org/libs/integer for documentation. |
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14 |
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15 |
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16 #ifndef BOOST_INTEGER_TRAITS_HPP |
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17 #define BOOST_INTEGER_TRAITS_HPP |
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18 |
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19 #include <boost/config.hpp> |
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20 #include <boost/limits.hpp> |
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21 |
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22 // These are an implementation detail and not part of the interface |
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23 #include <limits.h> |
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24 // we need wchar.h for WCHAR_MAX/MIN but not all platforms provide it, |
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25 // and some may have <wchar.h> but not <cwchar> ... |
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26 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T) && (!defined(BOOST_NO_CWCHAR) || defined(sun) || defined(__sun) || defined(__QNX__)) |
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27 #include <wchar.h> |
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28 #endif |
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29 |
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30 |
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31 namespace boost { |
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32 template<class T> |
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33 class integer_traits : public std::numeric_limits<T> |
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34 { |
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35 public: |
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36 BOOST_STATIC_CONSTANT(bool, is_integral = false); |
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37 }; |
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38 |
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39 namespace detail { |
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40 template<class T, T min_val, T max_val> |
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41 class integer_traits_base |
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42 { |
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43 public: |
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44 BOOST_STATIC_CONSTANT(bool, is_integral = true); |
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45 BOOST_STATIC_CONSTANT(T, const_min = min_val); |
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46 BOOST_STATIC_CONSTANT(T, const_max = max_val); |
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47 }; |
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48 |
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49 #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION |
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50 // A definition is required even for integral static constants |
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51 template<class T, T min_val, T max_val> |
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52 const bool integer_traits_base<T, min_val, max_val>::is_integral; |
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53 |
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54 template<class T, T min_val, T max_val> |
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55 const T integer_traits_base<T, min_val, max_val>::const_min; |
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56 |
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57 template<class T, T min_val, T max_val> |
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58 const T integer_traits_base<T, min_val, max_val>::const_max; |
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59 #endif |
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60 |
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61 } // namespace detail |
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62 |
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63 template<> |
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64 class integer_traits<bool> |
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65 : public std::numeric_limits<bool>, |
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66 public detail::integer_traits_base<bool, false, true> |
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67 { }; |
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68 |
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69 template<> |
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70 class integer_traits<char> |
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71 : public std::numeric_limits<char>, |
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72 public detail::integer_traits_base<char, CHAR_MIN, CHAR_MAX> |
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73 { }; |
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74 |
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75 template<> |
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76 class integer_traits<signed char> |
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77 : public std::numeric_limits<signed char>, |
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78 public detail::integer_traits_base<signed char, SCHAR_MIN, SCHAR_MAX> |
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79 { }; |
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80 |
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81 template<> |
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82 class integer_traits<unsigned char> |
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83 : public std::numeric_limits<unsigned char>, |
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84 public detail::integer_traits_base<unsigned char, 0, UCHAR_MAX> |
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85 { }; |
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86 |
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87 #ifndef BOOST_NO_INTRINSIC_WCHAR_T |
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88 template<> |
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89 class integer_traits<wchar_t> |
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90 : public std::numeric_limits<wchar_t>, |
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91 // Don't trust WCHAR_MIN and WCHAR_MAX with Mac OS X's native |
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92 // library: they are wrong! |
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93 #if defined(WCHAR_MIN) && defined(WCHAR_MAX) && !defined(__APPLE__) |
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94 public detail::integer_traits_base<wchar_t, WCHAR_MIN, WCHAR_MAX> |
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95 #elif defined(__BORLANDC__) || defined(__CYGWIN__) || defined(__MINGW32__) || (defined(__BEOS__) && defined(__GNUC__)) |
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96 // No WCHAR_MIN and WCHAR_MAX, whar_t is short and unsigned: |
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97 public detail::integer_traits_base<wchar_t, 0, 0xffff> |
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98 #elif (defined(__sgi) && (!defined(__SGI_STL_PORT) || __SGI_STL_PORT < 0x400))\ |
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99 || (defined __APPLE__)\ |
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100 || (defined(__OpenBSD__) && defined(__GNUC__))\ |
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101 || (defined(__NetBSD__) && defined(__GNUC__))\ |
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102 || (defined(__FreeBSD__) && defined(__GNUC__))\ |
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103 || (defined(__DragonFly__) && defined(__GNUC__))\ |
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104 || (defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 3) && !defined(__SGI_STL_PORT)) |
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105 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as int. |
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106 // - SGI MIPSpro with native library |
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107 // - gcc 3.x on HP-UX |
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108 // - Mac OS X with native library |
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109 // - gcc on FreeBSD, OpenBSD and NetBSD |
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110 public detail::integer_traits_base<wchar_t, INT_MIN, INT_MAX> |
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111 #elif defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 2) && !defined(__SGI_STL_PORT) |
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112 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as unsigned int. |
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113 // - gcc 2.95.x on HP-UX |
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114 // (also, std::numeric_limits<wchar_t> appears to return the wrong values). |
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115 public detail::integer_traits_base<wchar_t, 0, UINT_MAX> |
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116 #else |
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117 #error No WCHAR_MIN and WCHAR_MAX present, please adjust integer_traits<> for your compiler. |
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118 #endif |
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119 { }; |
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120 #endif // BOOST_NO_INTRINSIC_WCHAR_T |
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121 |
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122 template<> |
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123 class integer_traits<short> |
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124 : public std::numeric_limits<short>, |
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125 public detail::integer_traits_base<short, SHRT_MIN, SHRT_MAX> |
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126 { }; |
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127 |
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128 template<> |
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129 class integer_traits<unsigned short> |
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130 : public std::numeric_limits<unsigned short>, |
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131 public detail::integer_traits_base<unsigned short, 0, USHRT_MAX> |
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132 { }; |
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133 |
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134 template<> |
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135 class integer_traits<int> |
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136 : public std::numeric_limits<int>, |
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137 public detail::integer_traits_base<int, INT_MIN, INT_MAX> |
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138 { }; |
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139 |
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140 template<> |
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141 class integer_traits<unsigned int> |
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142 : public std::numeric_limits<unsigned int>, |
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143 public detail::integer_traits_base<unsigned int, 0, UINT_MAX> |
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144 { }; |
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145 |
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146 template<> |
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147 class integer_traits<long> |
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148 : public std::numeric_limits<long>, |
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149 public detail::integer_traits_base<long, LONG_MIN, LONG_MAX> |
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150 { }; |
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151 |
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152 template<> |
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153 class integer_traits<unsigned long> |
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154 : public std::numeric_limits<unsigned long>, |
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155 public detail::integer_traits_base<unsigned long, 0, ULONG_MAX> |
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156 { }; |
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157 |
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158 #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T) |
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159 #if defined(ULLONG_MAX) && defined(BOOST_HAS_LONG_LONG) |
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160 |
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161 template<> |
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162 class integer_traits< ::boost::long_long_type> |
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163 : public std::numeric_limits< ::boost::long_long_type>, |
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164 public detail::integer_traits_base< ::boost::long_long_type, LLONG_MIN, LLONG_MAX> |
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165 { }; |
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166 |
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167 template<> |
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168 class integer_traits< ::boost::ulong_long_type> |
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169 : public std::numeric_limits< ::boost::ulong_long_type>, |
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170 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULLONG_MAX> |
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171 { }; |
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172 |
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173 #elif defined(ULONG_LONG_MAX) && defined(BOOST_HAS_LONG_LONG) |
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174 |
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175 template<> |
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176 class integer_traits< ::boost::long_long_type> : public std::numeric_limits< ::boost::long_long_type>, public detail::integer_traits_base< ::boost::long_long_type, LONG_LONG_MIN, LONG_LONG_MAX>{ }; |
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177 template<> |
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178 class integer_traits< ::boost::ulong_long_type> |
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179 : public std::numeric_limits< ::boost::ulong_long_type>, |
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180 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULONG_LONG_MAX> |
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181 { }; |
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182 |
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183 #elif defined(ULONGLONG_MAX) && defined(BOOST_HAS_LONG_LONG) |
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184 |
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185 template<> |
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186 class integer_traits< ::boost::long_long_type> |
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187 : public std::numeric_limits< ::boost::long_long_type>, |
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188 public detail::integer_traits_base< ::boost::long_long_type, LONGLONG_MIN, LONGLONG_MAX> |
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189 { }; |
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190 |
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191 template<> |
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192 class integer_traits< ::boost::ulong_long_type> |
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193 : public std::numeric_limits< ::boost::ulong_long_type>, |
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194 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULONGLONG_MAX> |
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195 { }; |
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196 |
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197 #elif defined(_LLONG_MAX) && defined(_C2) && defined(BOOST_HAS_LONG_LONG) |
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198 |
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199 template<> |
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200 class integer_traits< ::boost::long_long_type> |
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201 : public std::numeric_limits< ::boost::long_long_type>, |
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202 public detail::integer_traits_base< ::boost::long_long_type, -_LLONG_MAX - _C2, _LLONG_MAX> |
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203 { }; |
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204 |
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205 template<> |
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206 class integer_traits< ::boost::ulong_long_type> |
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207 : public std::numeric_limits< ::boost::ulong_long_type>, |
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208 public detail::integer_traits_base< ::boost::ulong_long_type, 0, _ULLONG_MAX> |
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209 { }; |
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210 |
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211 #elif defined(BOOST_HAS_LONG_LONG) |
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212 // |
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213 // we have long long but no constants, this happens for example with gcc in -ansi mode, |
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214 // we'll just have to work out the values for ourselves (assumes 2's compliment representation): |
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215 // |
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216 template<> |
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217 class integer_traits< ::boost::long_long_type> |
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218 : public std::numeric_limits< ::boost::long_long_type>, |
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219 public detail::integer_traits_base< ::boost::long_long_type, (1LL << (sizeof(::boost::long_long_type) - 1)), ~(1LL << (sizeof(::boost::long_long_type) - 1))> |
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220 { }; |
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221 |
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222 template<> |
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223 class integer_traits< ::boost::ulong_long_type> |
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224 : public std::numeric_limits< ::boost::ulong_long_type>, |
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225 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ~0uLL> |
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226 { }; |
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227 |
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228 #endif |
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229 #endif |
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230 |
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231 } // namespace boost |
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232 |
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233 #endif /* BOOST_INTEGER_TRAITS_HPP */ |
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234 |
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235 |
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236 |