1 | // ----------------------------------------------------------- |
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2 | // |
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3 | // Copyright (c) 2001-2002 Chuck Allison and Jeremy Siek |
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4 | // Copyright (c) 2003-2006, 2008 Gennaro Prota |
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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 copy at |
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8 | // http://www.boost.org/LICENSE_1_0.txt) |
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9 | // |
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10 | // ----------------------------------------------------------- |
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11 | |
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12 | #ifndef BOOST_DETAIL_DYNAMIC_BITSET_HPP |
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13 | #define BOOST_DETAIL_DYNAMIC_BITSET_HPP |
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14 | |
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15 | #include <cstddef> |
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16 | #include "boost/config.hpp" |
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17 | #include "boost/detail/workaround.hpp" |
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18 | |
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19 | |
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20 | namespace boost { |
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21 | |
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22 | namespace detail { |
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23 | namespace dynamic_bitset_impl { |
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24 | |
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25 | // Gives (read-)access to the object representation |
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26 | // of an object of type T (3.9p4). CANNOT be used |
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27 | // on a base sub-object |
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28 | // |
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29 | template <typename T> |
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30 | inline const unsigned char * object_representation (T* p) |
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31 | { |
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32 | return static_cast<const unsigned char *>(static_cast<const void *>(p)); |
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33 | } |
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34 | |
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35 | template<typename T, int amount, int width /* = default */> |
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36 | struct shifter |
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37 | { |
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38 | static void left_shift(T & v) { |
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39 | amount >= width ? (v = 0) |
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40 | : (v >>= BOOST_DYNAMIC_BITSET_WRAP_CONSTANT(amount)); |
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41 | } |
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42 | }; |
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43 | |
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44 | // ------- count function implementation -------------- |
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45 | |
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46 | typedef unsigned char byte_type; |
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47 | |
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48 | // These two entities |
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49 | // |
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50 | // enum mode { access_by_bytes, access_by_blocks }; |
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51 | // template <mode> struct mode_to_type {}; |
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52 | // |
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53 | // were removed, since the regression logs (as of 24 Aug 2008) |
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54 | // showed that several compilers had troubles with recognizing |
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55 | // |
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56 | // const mode m = access_by_bytes |
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57 | // |
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58 | // as a constant expression |
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59 | // |
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60 | // * So, we'll use bool, instead of enum *. |
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61 | // |
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62 | template <bool value> |
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63 | struct value_to_type |
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64 | { |
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65 | value_to_type() {} |
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66 | }; |
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67 | const bool access_by_bytes = true; |
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68 | const bool access_by_blocks = false; |
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69 | |
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70 | |
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71 | // the table: wrapped in a class template, so |
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72 | // that it is only instantiated if/when needed |
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73 | // |
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74 | template <bool dummy_name = true> |
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75 | struct count_table { static const byte_type table[]; }; |
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76 | |
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77 | template <> |
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78 | struct count_table<false> { /* no table */ }; |
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79 | |
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80 | |
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81 | const unsigned int table_width = 8; |
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82 | template <bool b> |
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83 | const byte_type count_table<b>::table[] = |
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84 | { |
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85 | // Automatically generated by GPTableGen.exe v.1.0 |
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86 | // |
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87 | 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, |
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88 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
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89 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
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90 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
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91 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
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92 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
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93 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
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94 | 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8 |
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95 | }; |
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96 | |
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97 | |
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98 | // overload for access by bytes |
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99 | // |
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100 | |
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101 | template <typename Iterator> |
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102 | inline std::size_t do_count(Iterator first, std::size_t length, |
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103 | int /*dummy param*/, |
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104 | value_to_type<access_by_bytes>* ) |
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105 | { |
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106 | std::size_t num = 0; |
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107 | if (length) |
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108 | { |
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109 | const byte_type * p = object_representation(&*first); |
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110 | length *= sizeof(*first); |
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111 | |
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112 | do { |
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113 | num += count_table<>::table[*p]; |
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114 | ++p; |
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115 | --length; |
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116 | |
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117 | } while (length); |
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118 | } |
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119 | |
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120 | return num; |
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121 | } |
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122 | |
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123 | |
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124 | // overload for access by blocks |
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125 | // |
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126 | template <typename Iterator, typename ValueType> |
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127 | inline std::size_t do_count(Iterator first, std::size_t length, ValueType, |
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128 | value_to_type<access_by_blocks>*) |
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129 | { |
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130 | std::size_t num = 0; |
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131 | while (length){ |
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132 | |
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133 | ValueType value = *first; |
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134 | while (value) { |
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135 | num += count_table<>::table[value & ((1u<<table_width) - 1)]; |
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136 | value >>= table_width; |
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137 | } |
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138 | |
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139 | ++first; |
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140 | --length; |
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141 | } |
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142 | |
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143 | return num; |
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144 | } |
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145 | |
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146 | // ------------------------------------------------------- |
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147 | |
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148 | |
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149 | // Some library implementations simply return a dummy |
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150 | // value such as |
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151 | // |
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152 | // size_type(-1) / sizeof(T) |
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153 | // |
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154 | // from vector<>::max_size. This tries to get more |
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155 | // meaningful info. |
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156 | // |
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157 | template <typename T> |
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158 | typename T::size_type vector_max_size_workaround(const T & v) { |
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159 | |
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160 | typedef typename T::allocator_type allocator_type; |
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161 | |
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162 | const typename allocator_type::size_type alloc_max = |
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163 | v.get_allocator().max_size(); |
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164 | const typename T::size_type container_max = v.max_size(); |
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165 | |
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166 | return alloc_max < container_max? |
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167 | alloc_max : |
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168 | container_max; |
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169 | } |
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170 | |
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171 | // for static_asserts |
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172 | template <typename T> |
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173 | struct allowed_block_type { |
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174 | enum { value = T(-1) > 0 }; // ensure T has no sign |
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175 | }; |
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176 | |
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177 | template <> |
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178 | struct allowed_block_type<bool> { |
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179 | enum { value = false }; |
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180 | }; |
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181 | |
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182 | |
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183 | template <typename T> |
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184 | struct is_numeric { |
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185 | enum { value = false }; |
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186 | }; |
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187 | |
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188 | # define BOOST_dynamic_bitset_is_numeric(x) \ |
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189 | template<> \ |
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190 | struct is_numeric< x > { \ |
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191 | enum { value = true }; \ |
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192 | } /**/ |
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193 | |
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194 | BOOST_dynamic_bitset_is_numeric(bool); |
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195 | BOOST_dynamic_bitset_is_numeric(char); |
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196 | |
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197 | #if !defined(BOOST_NO_INTRINSIC_WCHAR_T) |
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198 | BOOST_dynamic_bitset_is_numeric(wchar_t); |
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199 | #endif |
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200 | |
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201 | BOOST_dynamic_bitset_is_numeric(signed char); |
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202 | BOOST_dynamic_bitset_is_numeric(short int); |
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203 | BOOST_dynamic_bitset_is_numeric(int); |
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204 | BOOST_dynamic_bitset_is_numeric(long int); |
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205 | |
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206 | BOOST_dynamic_bitset_is_numeric(unsigned char); |
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207 | BOOST_dynamic_bitset_is_numeric(unsigned short); |
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208 | BOOST_dynamic_bitset_is_numeric(unsigned int); |
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209 | BOOST_dynamic_bitset_is_numeric(unsigned long); |
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210 | |
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211 | #if defined(BOOST_HAS_LONG_LONG) |
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212 | BOOST_dynamic_bitset_is_numeric(::boost::long_long_type); |
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213 | BOOST_dynamic_bitset_is_numeric(::boost::ulong_long_type); |
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214 | #endif |
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215 | |
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216 | // intentionally omitted |
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217 | //BOOST_dynamic_bitset_is_numeric(float); |
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218 | //BOOST_dynamic_bitset_is_numeric(double); |
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219 | //BOOST_dynamic_bitset_is_numeric(long double); |
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220 | |
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221 | #undef BOOST_dynamic_bitset_is_numeric |
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222 | |
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223 | } // dynamic_bitset_impl |
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224 | } // namespace detail |
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225 | |
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226 | } // namespace boost |
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227 | |
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228 | #endif // include guard |
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229 | |
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