1 | |
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2 | #ifndef BOOST_MPL_STRING_HPP_INCLUDED |
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3 | #define BOOST_MPL_STRING_HPP_INCLUDED |
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4 | |
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5 | // Copyright Eric Niebler 2009 |
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6 | // |
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7 | // Distributed under the Boost Software License, Version 1.0. |
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8 | // (See accompanying file LICENSE_1_0.txt or copy at |
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9 | // http://www.boost.org/LICENSE_1_0.txt) |
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10 | // |
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11 | // See http://www.boost.org/libs/mpl for documentation. |
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12 | |
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13 | // $Id: string.hpp 49239 2009-04-01 09:10:26Z eric_niebler $ |
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14 | // $Date: 2009-04-01 02:10:26 -0700 (Wed, 1 Apr 2009) $ |
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15 | // $Revision: 49239 $ |
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16 | // |
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17 | // Thanks to: |
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18 | // Dmitry Goncharov for porting this to the Sun compiler |
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19 | |
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20 | #include <boost/config.hpp> |
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21 | #include <boost/detail/workaround.hpp> |
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22 | #include <boost/detail/endian.hpp> |
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23 | #include <boost/mpl/limits/string.hpp> |
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24 | #include <boost/mpl/if.hpp> |
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25 | #include <boost/mpl/char.hpp> |
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26 | #include <boost/mpl/copy.hpp> |
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27 | #include <boost/mpl/size.hpp> |
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28 | #include <boost/mpl/empty.hpp> |
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29 | #include <boost/mpl/assert.hpp> |
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30 | #include <boost/mpl/size_t.hpp> |
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31 | #include <boost/mpl/begin_end.hpp> |
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32 | #include <boost/mpl/joint_view.hpp> |
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33 | #include <boost/mpl/insert_range.hpp> |
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34 | #include <boost/mpl/back_inserter.hpp> |
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35 | #include <boost/mpl/front_inserter.hpp> |
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36 | #include <boost/mpl/iterator_range.hpp> |
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37 | #include <boost/preprocessor/arithmetic/dec.hpp> |
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38 | #include <boost/preprocessor/arithmetic/add.hpp> |
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39 | #include <boost/preprocessor/arithmetic/div.hpp> |
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40 | #include <boost/preprocessor/punctuation/comma_if.hpp> |
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41 | #include <boost/preprocessor/repetition/repeat.hpp> |
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42 | #include <boost/preprocessor/repetition/enum_params.hpp> |
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43 | #include <boost/preprocessor/repetition/repeat_from_to.hpp> |
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44 | #include <boost/preprocessor/repetition/enum_shifted_params.hpp> |
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45 | #include <boost/preprocessor/repetition/enum_trailing_params.hpp> |
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46 | #include <boost/preprocessor/repetition/enum_params_with_a_default.hpp> |
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47 | |
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48 | #include <iterator> // for bidirectional_iterator_tag |
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49 | #include <climits> |
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50 | |
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51 | namespace boost { namespace mpl |
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52 | { |
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53 | #define BOOST_MPL_STRING_MAX_PARAMS \ |
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54 | BOOST_PP_DIV(BOOST_PP_ADD(BOOST_MPL_LIMIT_STRING_SIZE, 3), 4) |
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55 | |
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56 | // Low-level bit-twiddling is done by macros. Any implementation-defined behavior of |
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57 | // multi-character literals should be localized to these macros. |
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58 | |
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59 | #define BOOST_MPL_MULTICHAR_LENGTH(c) \ |
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60 | (std::size_t)((c<CHAR_MIN) ? 4 : ((c>0xffffff)+(c>0xffff)+(c>0xff)+1)) |
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61 | |
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62 | #if defined(BOOST_LITTLE_ENDIAN) && defined(__SUNPRO_CC) |
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63 | |
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64 | #define BOOST_MPL_MULTICHAR_AT(c,i) \ |
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65 | (char)(0xff&((unsigned)(c)>>(8*(std::size_t)(i)))) |
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66 | |
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67 | #define BOOST_MPL_MULTICHAR_PUSH_BACK(c,i) \ |
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68 | ((((unsigned char)(i))<<(BOOST_MPL_MULTICHAR_LENGTH(c)*8))|(unsigned)(c)) |
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69 | |
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70 | #define BOOST_MPL_MULTICHAR_PUSH_FRONT(c,i) \ |
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71 | (((unsigned)(c)<<8)|(unsigned char)(i)) |
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72 | |
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73 | #define BOOST_MPL_MULTICHAR_POP_BACK(c) \ |
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74 | (((1<<((BOOST_MPL_MULTICHAR_LENGTH(c)-1)*8))-1)&(unsigned)(c)) |
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75 | |
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76 | #define BOOST_MPL_MULTICHAR_POP_FRONT(c) \ |
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77 | ((unsigned)(c)>>8) |
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78 | |
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79 | #else |
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80 | |
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81 | #define BOOST_MPL_MULTICHAR_AT(c,i) \ |
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82 | (char)(0xff&((unsigned)(c)>>(8*(BOOST_MPL_MULTICHAR_LENGTH(c)-(std::size_t)(i)-1)))) |
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83 | |
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84 | #define BOOST_MPL_MULTICHAR_PUSH_BACK(c,i) \ |
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85 | (((unsigned)(c)<<8)|(unsigned char)(i)) |
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86 | |
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87 | #define BOOST_MPL_MULTICHAR_PUSH_FRONT(c,i) \ |
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88 | ((((unsigned char)(i))<<(BOOST_MPL_MULTICHAR_LENGTH(c)*8))|(unsigned)(c)) |
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89 | |
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90 | #define BOOST_MPL_MULTICHAR_POP_BACK(c) \ |
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91 | ((unsigned)(c)>>8) |
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92 | |
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93 | #define BOOST_MPL_MULTICHAR_POP_FRONT(c) \ |
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94 | (((1<<((BOOST_MPL_MULTICHAR_LENGTH(c)-1)*8))-1)&(unsigned)(c)) |
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95 | |
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96 | #endif |
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97 | |
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98 | struct string_tag; |
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99 | struct string_iterator_tag; |
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100 | |
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101 | template<BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(BOOST_MPL_STRING_MAX_PARAMS, int C, 0)> |
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102 | struct string; |
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103 | |
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104 | template<typename Sequence, int I, int J> |
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105 | struct string_iterator; |
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106 | |
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107 | template<typename Sequence> |
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108 | struct sequence_tag; |
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109 | |
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110 | template<typename Tag> |
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111 | struct size_impl; |
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112 | |
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113 | template<> |
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114 | struct size_impl<mpl::string_tag> |
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115 | { |
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116 | template<typename Sequence> |
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117 | struct apply; |
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118 | |
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119 | #define M0(z, n, data) \ |
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120 | + BOOST_MPL_MULTICHAR_LENGTH(BOOST_PP_CAT(C,n)) |
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121 | |
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122 | #define M1(z, n, data) \ |
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123 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C)> \ |
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124 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)> > \ |
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125 | : mpl::size_t<(0 BOOST_PP_REPEAT_ ## z(n, M0, ~))> \ |
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126 | {}; |
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127 | |
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128 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_PP_INC(BOOST_MPL_STRING_MAX_PARAMS), M1, ~) |
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129 | #undef M0 |
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130 | #undef M1 |
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131 | }; |
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132 | |
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133 | template<> |
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134 | struct size_impl<mpl::string_tag>::apply<mpl::string<> > |
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135 | : mpl::size_t<0> |
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136 | {}; |
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137 | |
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138 | template<typename Tag> |
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139 | struct begin_impl; |
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140 | |
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141 | template<> |
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142 | struct begin_impl<mpl::string_tag> |
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143 | { |
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144 | template<typename Sequence> |
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145 | struct apply |
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146 | { |
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147 | typedef mpl::string_iterator<Sequence, 0, 0> type; |
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148 | }; |
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149 | }; |
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150 | |
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151 | template<typename Tag> |
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152 | struct end_impl; |
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153 | |
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154 | template<> |
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155 | struct end_impl<mpl::string_tag> |
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156 | { |
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157 | template<typename Sequence> |
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158 | struct apply; |
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159 | |
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160 | #define M0(z,n,data) \ |
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161 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C)> \ |
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162 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)> > \ |
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163 | { \ |
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164 | typedef mpl::string_iterator<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)>, n, 0> type; \ |
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165 | }; |
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166 | |
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167 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_PP_INC(BOOST_MPL_STRING_MAX_PARAMS), M0, ~) |
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168 | #undef M0 |
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169 | }; |
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170 | |
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171 | template<> |
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172 | struct end_impl<mpl::string_tag>::apply<mpl::string<> > |
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173 | { |
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174 | typedef mpl::string_iterator<mpl::string<>, 0, 0> type; |
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175 | }; |
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176 | |
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177 | template<typename Tag> |
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178 | struct push_back_impl; |
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179 | |
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180 | template<> |
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181 | struct push_back_impl<mpl::string_tag> |
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182 | { |
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183 | template<typename Sequence, typename Value, bool B = (4==BOOST_MPL_MULTICHAR_LENGTH(Sequence::back_))> |
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184 | struct apply |
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185 | { |
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186 | BOOST_MPL_ASSERT_MSG( |
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187 | (BOOST_MPL_LIMIT_STRING_SIZE != mpl::size<Sequence>::type::value) |
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188 | , PUSH_BACK_FAILED_MPL_STRING_IS_FULL |
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189 | , (Sequence) |
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190 | ); |
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191 | // If the above assertion didn't fire, then the string is sparse. |
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192 | // Repack the string and retry the push_back |
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193 | typedef |
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194 | typename mpl::push_back< |
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195 | typename mpl::copy< |
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196 | Sequence |
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197 | , mpl::back_inserter<mpl::string<> > |
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198 | >::type |
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199 | , Value |
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200 | >::type |
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201 | type; |
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202 | }; |
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203 | |
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204 | template<typename Value> |
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205 | struct apply<mpl::string<>, Value, false> |
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206 | { |
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207 | typedef mpl::string<(char)Value::value> type; |
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208 | }; |
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209 | |
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210 | #define M0(z,n,data) \ |
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211 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C), typename Value> \ |
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212 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)>, Value, false> \ |
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213 | { \ |
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214 | typedef \ |
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215 | mpl::string< \ |
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216 | BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_DEC(n), C) \ |
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217 | BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \ |
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218 | ((unsigned)BOOST_PP_CAT(C,BOOST_PP_DEC(n))>0xffffff) \ |
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219 | ?BOOST_PP_CAT(C,BOOST_PP_DEC(n)) \ |
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220 | :BOOST_MPL_MULTICHAR_PUSH_BACK(BOOST_PP_CAT(C,BOOST_PP_DEC(n)), Value::value) \ |
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221 | , ((unsigned)BOOST_PP_CAT(C,BOOST_PP_DEC(n))>0xffffff) \ |
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222 | ?(char)Value::value \ |
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223 | :0 \ |
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224 | > \ |
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225 | type; \ |
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226 | }; |
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227 | |
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228 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_MPL_STRING_MAX_PARAMS, M0, ~) |
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229 | #undef M0 |
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230 | |
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231 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C), typename Value> |
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232 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)>, Value, false> |
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233 | { |
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234 | typedef |
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235 | mpl::string< |
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236 | BOOST_PP_ENUM_PARAMS(BOOST_PP_DEC(BOOST_MPL_STRING_MAX_PARAMS), C) |
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237 | , BOOST_MPL_MULTICHAR_PUSH_BACK(BOOST_PP_CAT(C,BOOST_PP_DEC(BOOST_MPL_STRING_MAX_PARAMS)), Value::value) |
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238 | > |
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239 | type; |
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240 | }; |
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241 | }; |
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242 | |
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243 | template<typename Tag> |
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244 | struct has_push_back_impl; |
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245 | |
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246 | template<> |
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247 | struct has_push_back_impl<mpl::string_tag> |
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248 | { |
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249 | template<typename Sequence> |
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250 | struct apply |
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251 | : mpl::true_ |
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252 | {}; |
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253 | }; |
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254 | |
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255 | template<typename Tag> |
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256 | struct pop_back_impl; |
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257 | |
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258 | template<> |
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259 | struct pop_back_impl<mpl::string_tag> |
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260 | { |
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261 | template<typename Sequence> |
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262 | struct apply; |
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263 | |
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264 | #define M0(z,n,data) \ |
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265 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C)> \ |
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266 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)> > \ |
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267 | { \ |
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268 | BOOST_MPL_ASSERT_MSG((C0 != 0), POP_BACK_FAILED_MPL_STRING_IS_EMPTY, (mpl::string<>)); \ |
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269 | typedef \ |
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270 | mpl::string< \ |
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271 | BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_DEC(n), C) \ |
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272 | BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \ |
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273 | BOOST_MPL_MULTICHAR_POP_BACK(BOOST_PP_CAT(C,BOOST_PP_DEC(n))) \ |
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274 | > \ |
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275 | type; \ |
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276 | }; |
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277 | |
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278 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_PP_INC(BOOST_MPL_STRING_MAX_PARAMS), M0, ~) |
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279 | #undef M0 |
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280 | }; |
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281 | |
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282 | template<typename Tag> |
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283 | struct has_pop_back_impl; |
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284 | |
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285 | template<> |
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286 | struct has_pop_back_impl<mpl::string_tag> |
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287 | { |
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288 | template<typename Sequence> |
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289 | struct apply |
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290 | : mpl::true_ |
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291 | {}; |
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292 | }; |
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293 | |
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294 | template<typename Tag> |
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295 | struct push_front_impl; |
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296 | |
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297 | template<> |
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298 | struct push_front_impl<mpl::string_tag> |
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299 | { |
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300 | template<typename Sequence, typename Value, bool B = (4==BOOST_MPL_MULTICHAR_LENGTH(Sequence::front_))> |
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301 | struct apply |
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302 | { |
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303 | BOOST_MPL_ASSERT_MSG( |
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304 | (BOOST_MPL_LIMIT_STRING_SIZE != mpl::size<Sequence>::type::value) |
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305 | , PUSH_FRONT_FAILED_MPL_STRING_IS_FULL |
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306 | , (Sequence) |
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307 | ); |
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308 | // If the above assertion didn't fire, then the string is sparse. |
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309 | // Repack the string and retry the push_front. |
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310 | typedef |
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311 | typename mpl::push_front< |
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312 | typename mpl::reverse_copy< |
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313 | Sequence |
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314 | , mpl::front_inserter<string<> > |
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315 | >::type |
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316 | , Value |
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317 | >::type |
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318 | type; |
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319 | }; |
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320 | |
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321 | #if !BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590)) |
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322 | template<typename Value> |
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323 | struct apply<mpl::string<>, Value, false> |
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324 | { |
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325 | typedef mpl::string<(char)Value::value> type; |
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326 | }; |
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327 | #endif |
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328 | |
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329 | #define M0(z,n,data) \ |
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330 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C), typename Value> \ |
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331 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)>, Value, true> \ |
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332 | { \ |
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333 | typedef \ |
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334 | mpl::string< \ |
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335 | (char)Value::value \ |
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336 | BOOST_PP_ENUM_TRAILING_PARAMS_Z(z, n, C) \ |
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337 | > \ |
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338 | type; \ |
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339 | }; |
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340 | |
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341 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_MPL_STRING_MAX_PARAMS, M0, ~) |
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342 | #undef M0 |
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343 | |
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344 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C), typename Value> |
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345 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)>, Value, false> |
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346 | { |
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347 | typedef |
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348 | mpl::string< |
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349 | BOOST_MPL_MULTICHAR_PUSH_FRONT(C0, Value::value) |
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350 | , BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C) |
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351 | > |
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352 | type0; |
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353 | |
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354 | #if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590)) |
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355 | typedef |
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356 | typename mpl::if_< |
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357 | mpl::empty<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)> > |
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358 | , mpl::string<(char)Value::value> |
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359 | , type0 |
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360 | >::type |
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361 | type; |
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362 | #else |
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363 | typedef type0 type; |
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364 | #endif |
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365 | }; |
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366 | }; |
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367 | |
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368 | template<typename Tag> |
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369 | struct has_push_front_impl; |
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370 | |
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371 | template<> |
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372 | struct has_push_front_impl<mpl::string_tag> |
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373 | { |
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374 | template<typename Sequence> |
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375 | struct apply |
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376 | : mpl::true_ |
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377 | {}; |
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378 | }; |
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379 | |
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380 | template<typename Tag> |
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381 | struct pop_front_impl; |
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382 | |
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383 | template<> |
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384 | struct pop_front_impl<mpl::string_tag> |
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385 | { |
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386 | template<typename Sequence, bool B = (1==BOOST_MPL_MULTICHAR_LENGTH(Sequence::front_))> |
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387 | struct apply; |
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388 | |
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389 | #define M0(z,n,data) \ |
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390 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C)> \ |
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391 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)>, true> \ |
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392 | { \ |
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393 | BOOST_MPL_ASSERT_MSG((C0 != 0), POP_FRONT_FAILED_MPL_STRING_IS_EMPTY, (mpl::string<>)); \ |
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394 | typedef \ |
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395 | mpl::string<BOOST_PP_ENUM_SHIFTED_PARAMS_Z(z, n, C)> \ |
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396 | type; \ |
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397 | }; |
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398 | |
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399 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_MPL_STRING_MAX_PARAMS, M0, ~) |
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400 | #undef M0 |
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401 | |
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402 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C)> |
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403 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)>, false> |
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404 | { |
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405 | typedef |
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406 | mpl::string< |
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407 | BOOST_MPL_MULTICHAR_POP_FRONT(C0) |
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408 | , BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C) |
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409 | > |
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410 | type; |
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411 | }; |
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412 | }; |
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413 | |
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414 | template<typename Tag> |
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415 | struct has_pop_front_impl; |
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416 | |
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417 | template<> |
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418 | struct has_pop_front_impl<mpl::string_tag> |
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419 | { |
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420 | template<typename Sequence> |
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421 | struct apply |
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422 | : mpl::true_ |
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423 | {}; |
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424 | }; |
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425 | |
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426 | template<typename Tag> |
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427 | struct insert_range_impl; |
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428 | |
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429 | template<> |
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430 | struct insert_range_impl<mpl::string_tag> |
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431 | { |
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432 | template<typename Sequence, typename Pos, typename Range> |
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433 | struct apply |
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434 | : mpl::copy< |
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435 | mpl::joint_view< |
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436 | mpl::iterator_range< |
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437 | mpl::string_iterator<Sequence, 0, 0> |
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438 | , Pos |
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439 | > |
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440 | , mpl::joint_view< |
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441 | Range |
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442 | , mpl::iterator_range< |
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443 | Pos |
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444 | , typename mpl::end<Sequence>::type |
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445 | > |
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446 | > |
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447 | > |
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448 | , mpl::back_inserter<mpl::string<> > |
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449 | > |
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450 | {}; |
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451 | }; |
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452 | |
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453 | template<typename Tag> |
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454 | struct insert_impl; |
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455 | |
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456 | template<> |
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457 | struct insert_impl<mpl::string_tag> |
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458 | { |
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459 | template<typename Sequence, typename Pos, typename Value> |
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460 | struct apply |
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461 | : mpl::insert_range<Sequence, Pos, mpl::string<(char)Value::value> > |
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462 | {}; |
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463 | }; |
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464 | |
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465 | template<typename Tag> |
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466 | struct erase_impl; |
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467 | |
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468 | template<> |
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469 | struct erase_impl<mpl::string_tag> |
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470 | { |
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471 | template<typename Sequence, typename First, typename Last> |
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472 | struct apply |
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473 | : mpl::copy< |
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474 | mpl::joint_view< |
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475 | mpl::iterator_range< |
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476 | mpl::string_iterator<Sequence, 0, 0> |
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477 | , First |
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478 | > |
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479 | , mpl::iterator_range< |
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480 | typename mpl::if_na<Last, typename mpl::next<First>::type>::type |
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481 | , typename mpl::end<Sequence>::type |
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482 | > |
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483 | > |
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484 | , mpl::back_inserter<mpl::string<> > |
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485 | > |
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486 | {}; |
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487 | }; |
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488 | |
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489 | template<typename Tag> |
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490 | struct clear_impl; |
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491 | |
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492 | template<> |
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493 | struct clear_impl<mpl::string_tag> |
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494 | { |
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495 | template<typename> |
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496 | struct apply |
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497 | { |
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498 | typedef mpl::string<> type; |
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499 | }; |
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500 | }; |
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501 | |
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502 | #define M0(z, n, data) \ |
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503 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C), int J> \ |
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504 | struct string_iterator<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)>, n, J> \ |
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505 | { \ |
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506 | enum { eomc_ = (BOOST_MPL_MULTICHAR_LENGTH(BOOST_PP_CAT(C, n)) == J + 1) }; \ |
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507 | typedef mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)> string; \ |
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508 | typedef std::bidirectional_iterator_tag category; \ |
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509 | typedef \ |
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510 | mpl::string_iterator<string, n + eomc_, eomc_ ? 0 : J + 1> \ |
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511 | next; \ |
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512 | typedef \ |
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513 | mpl::string_iterator<string, n, J - 1> \ |
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514 | prior; \ |
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515 | typedef mpl::char_<BOOST_MPL_MULTICHAR_AT(BOOST_PP_CAT(C, n), J)> type; \ |
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516 | }; \ |
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517 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C)> \ |
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518 | struct string_iterator<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)>, n, 0> \ |
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519 | { \ |
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520 | enum { eomc_ = (BOOST_MPL_MULTICHAR_LENGTH(BOOST_PP_CAT(C, n)) == 1) }; \ |
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521 | typedef mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)> string; \ |
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522 | typedef std::bidirectional_iterator_tag category; \ |
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523 | typedef \ |
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524 | mpl::string_iterator<string, n + eomc_, !eomc_> \ |
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525 | next; \ |
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526 | typedef \ |
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527 | mpl::string_iterator< \ |
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528 | string \ |
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529 | , n - 1 \ |
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530 | , BOOST_MPL_MULTICHAR_LENGTH(BOOST_PP_CAT(C, BOOST_PP_DEC(n))) - 1 \ |
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531 | > \ |
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532 | prior; \ |
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533 | typedef mpl::char_<BOOST_MPL_MULTICHAR_AT(BOOST_PP_CAT(C, n), 0)> type; \ |
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534 | }; |
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535 | |
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536 | BOOST_PP_REPEAT(BOOST_MPL_STRING_MAX_PARAMS, M0, ~) |
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537 | #undef M0 |
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538 | |
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539 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C)> |
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540 | struct string |
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541 | { |
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542 | /// INTERNAL ONLY |
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543 | enum |
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544 | { |
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545 | front_ = C0 |
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546 | , back_ = BOOST_PP_CAT(C, BOOST_PP_DEC(BOOST_MPL_STRING_MAX_PARAMS)) |
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547 | }; |
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548 | |
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549 | typedef char value_type; |
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550 | typedef string type; |
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551 | typedef string_tag tag; |
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552 | }; |
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553 | |
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554 | namespace aux_ |
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555 | { |
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556 | template<typename It, typename End> |
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557 | struct next_unless |
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558 | : mpl::next<It> |
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559 | {}; |
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560 | |
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561 | template<typename End> |
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562 | struct next_unless<End, End> |
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563 | { |
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564 | typedef End type; |
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565 | }; |
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566 | |
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567 | template<typename It, typename End> |
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568 | struct deref_unless |
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569 | : mpl::deref<It> |
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570 | {}; |
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571 | |
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572 | template<typename End> |
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573 | struct deref_unless<End, End> |
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574 | { |
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575 | typedef mpl::char_<'\0'> type; |
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576 | }; |
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577 | } |
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578 | |
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579 | template<typename Sequence> |
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580 | struct c_str |
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581 | { |
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582 | typedef typename mpl::end<Sequence>::type iend; |
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583 | typedef typename mpl::begin<Sequence>::type i0; |
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584 | #define M0(z, n, data) \ |
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585 | typedef \ |
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586 | typename mpl::aux_::next_unless<BOOST_PP_CAT(i, n), iend>::type \ |
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587 | BOOST_PP_CAT(i, BOOST_PP_INC(n)); |
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588 | BOOST_PP_REPEAT(BOOST_MPL_LIMIT_STRING_SIZE, M0, ~) |
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589 | #undef M0 |
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590 | |
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591 | typedef c_str type; |
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592 | static typename Sequence::value_type const value[BOOST_MPL_LIMIT_STRING_SIZE+1]; |
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593 | }; |
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594 | |
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595 | template<typename Sequence> |
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596 | typename Sequence::value_type const c_str<Sequence>::value[BOOST_MPL_LIMIT_STRING_SIZE+1] = |
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597 | { |
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598 | #define M0(z, n, data) \ |
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599 | mpl::aux_::deref_unless<BOOST_PP_CAT(i, n), iend>::type::value, |
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600 | BOOST_PP_REPEAT(BOOST_MPL_LIMIT_STRING_SIZE, M0, ~) |
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601 | #undef M0 |
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602 | '\0' |
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603 | }; |
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604 | |
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605 | }} // namespace boost |
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606 | |
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607 | #endif // BOOST_MPL_STRING_HPP_INCLUDED |
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